JDK 1.1 Source Code Directory
JDK 1.1 source code directory contains Java source code for JDK 1.1 core classes:
"C:\fyicenter\jdk-1.1.8\src".
Here is the list of Java classes of the JDK 1.1 source code:
✍: FYIcenter
⏎ java/net/URLConnection.java
/*
* @(#)URLConnection.java 1.34 01/12/10
*
* Copyright 2002 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package java.net;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Hashtable;
import java.util.Date;
import java.util.StringTokenizer;
/**
* The abstract class <code>URLConnection</code> is the superclass
* of all classes that represent a communications link between the
* application and a URL. Instances of this class can be used both to
* read from and to write to the resource referenced by the URL. In
* general, creating a connection to a URL is a multistep process:
* <p>
* <center><table border>
* <tr><th><code>openConnection()</code></th>
* <th><code>connect()</code></th></tr>
* <tr><td>Manipulate parameters that affect the connection to the remote
* resource.</td>
* <td>Interact with the resource; query header fields and
* contents.</td></tr>
* </table>
* ---------------------------->
* <br>time</center>
*
* <ol>
* <li>The connection object is created by invoking the
* <code>openConnection</code> method on a URL.
* <li>The setup parameters and general request properties are manipulated.
* <li>The actual connection to the remote object is made, using the
* <code>connect</code> method.
* <li>The remote object becomes available. The header fields and the contents
* of the remote object can be accessed.
* </ol>
* <p>
* The setup parameters are modified using the following methods:
* <ul><code>
* <li>setAllowUserInteraction
* <li>setDoInput
* <li>setDoOutput
* <li>setIfModifiedSince
* <li>setUseCaches
* </code></ul>
* <p>
* and the general request properties are modified using the method:
* <ul><code>
* <li>setRequestProperty
* </code></ul>
* <p>
* Default values for the <code>AllowUserInteraction</code> and
* <code>UseCaches</code> parameters can be set using the methods
* <code>setDefaultAllowUserInteraction</code> and
* <code>setDefaultUseCaches</code>. Default values for general
* request properties can be set using the
* <code>setDefaultRequestProperty</code> method.
* <p>
* Each of the above <code>set</code> methods has a corresponding
* <code>get</code> method to retrieve the value of the parameter or
* general request property. The specific parameters and general
* request properties that are applicable are protocol specific.
* <p>
* The following methods are used to access the header fields and
* the contents after the connection is made to the remote object:
* <ul><code>
* <li>getContent
* <li>getHeaderField
* <li>getInputStream
* <li>getOutputStream
* </code></ul>
* <p>
* Certain header fields are accessed frequently. The methods:
* <ul><code>
* <li>getContentEncoding
* <li>getContentLength
* <li>getContentType
* <li>getDate
* <li>getExpiration
* <li>getLastModified
* </code></ul>
* <p>
* provide convenient access to these fields. The
* <code>getContentType</code> method is used by the
* <code>getContent</code> method to determine the type of the remote
* object; subclasses may find it convenient to override the
* <code>getContentType</code> method.
* <p>
* In the common case, all of the pre-connection parameters and
* general request properties can be ignored: the pre-connection
* parameters and request properties default to sensible values. For
* most clients of this interface, there are only two interesting
* methods: <code>getInputStream</code> and <code>getObject</code>,
* which are mirrored in the <code>URL</code> class by convenience methods.
* <p>
* More information on the request properties and header fields of
* an <code>http</code> connection can be found at:
* <ul><code>
* http://www.w3.org/hypertext/WWW/Protocols/HTTP1.0/draft-ietf-http-spec.html
* </code></ul>
* <p>
* Note about <code>fileNameMap</code>: In versions prior to JDK 1.1.6,
* field <code>fileNameMap</code> of <code>URLConnection</code> was public.
* In JDK 1.1.6 and later, <code>fileNameMap</code> is private; accessor
* method <code>getFileNameMap()</code> and mutator method
* <code>setFileNameMap(FileNameMap)</code> are added to access it.
* This change is also described on the
* <a href="http://java.sun.com/products/jdk/1.1/compatibility.html">
* JDK 1.1.x Compatibility</a> page.
*
* @author James Gosling
* @version 1.34, 12/10/01
* @see java.net.URL#openConnection()
* @see java.net.URLConnection#connect()
* @see java.net.URLConnection#getContent()
* @see java.net.URLConnection#getContentEncoding()
* @see java.net.URLConnection#getContentLength()
* @see java.net.URLConnection#getContentType()
* @see java.net.URLConnection#getDate()
* @see java.net.URLConnection#getExpiration()
* @see java.net.URLConnection#getHeaderField(int)
* @see java.net.URLConnection#getHeaderField(java.lang.String)
* @see java.net.URLConnection#getInputStream()
* @see java.net.URLConnection#getLastModified()
* @see java.net.URLConnection#getOutputStream()
* @see java.net.URLConnection#setAllowUserInteraction(boolean)
* @see java.net.URLConnection#setDefaultRequestProperty(java.lang.String, java.lang.String)
* @see java.net.URLConnection#setDefaultUseCaches(boolean)
* @see java.net.URLConnection#setDoInput(boolean)
* @see java.net.URLConnection#setDoOutput(boolean)
* @see java.net.URLConnection#setIfModifiedSince(long)
* @see java.net.URLConnection#setRequestProperty(java.lang.String, java.lang.String)
* @see java.net.URLConnection#setUseCaches(boolean)
* @since JDK1.0
*/
abstract public class URLConnection {
/**
* The URL represents the remote object on the World Wide Web to
* which this connection is opened.
* <p>
* The value of this field can be accessed by the
* <code>getURL</code> method.
* <p>
* The default value of this variable is the value of the URL
* argument in the <code>URLConnection</code> constructor.
*
* @see java.net.URLConnection#getURL()
* @see java.net.URLConnection#url
* @since JDK1.0
*/
protected URL url;
/**
* This variable is set by the <code>setDoInput</code> method. Its
* value is returned by the <code>getDoInput</code> method.
* <p>
* A URL connection can be used for input and/or output. Setting the
* <code>doInput</code> flag to <code>true</code> indicates that
* the application intends to read data from the URL connection.
* <p>
* The default value of this field is <code>true</code>.
*
* @see java.net.URLConnection#getDoInput()
* @see java.net.URLConnection#setDoInput(boolean)
* @since JDK1.0
*/
protected boolean doInput = true;
/**
* This variable is set by the <code>setDoOutput</code> method. Its
* value is returned by the <code>getDoInput</code> method.
* <p>
* A URL connection can be used for input and/or output. Setting the
* <code>doOutput</code> flag to <code>true</code> indicates
* that the application intends to write data to the URL connection.
* <p>
* The default value of this field is <code>false</code>.
*
* @see java.net.URLConnection#getDoOutput()
* @see java.net.URLConnection#setDoOutput(boolean)
* @since JDK1.0
*/
protected boolean doOutput = false;
private static boolean defaultAllowUserInteraction = false;
/**
* If <code>true</code>, this <code>URL</code> is being examined in
* a context in which it makes sense to allow user interactions such
* as popping up an authentication dialog. If <code>false</code>,
* then no user interaction is allowed.
* <p>
* The value of this field can be set by the
* <code>setAllowUserInteraction</code> method.
* Its value is returned by the
* <code>getAllowUserInteraction</code> method.
* Its default value is the value of the argument in the last invocation
* of the <code>setDefaultAllowUserInteraction</code> method.
*
* @see java.net.URLConnection#getAllowUserInteraction()
* @see java.net.URLConnection#setAllowUserInteraction(boolean)
* @see java.net.URLConnection#setDefaultAllowUserInteraction(boolean)
* @since JDK1.0
*/
protected boolean allowUserInteraction = defaultAllowUserInteraction;
private static boolean defaultUseCaches = true;
/**
* If <code>true</code>, the protocol is allowed to use caching
* whenever it can. If <code>false</code>, the protocol must always
* try to get a fresh copy of the object.
* <p>
* This field is set by the <code>setUseCaches</code> method. Its
* value is returned by the <code>getUseCaches</code> method.
* <p>
* Its default value is the value given in the last invocation of the
* <code>setDefaultUseCaches</code> method.
*
* @see java.net.URLConnection#setUseCaches(boolean)
* @see java.net.URLConnection#getUseCaches()
* @see java.net.URLConnection#setDefaultUseCaches(boolean)
* @since JDK1.0
*/
protected boolean useCaches = defaultUseCaches;
/**
* Some protocols support skipping the fetching of the object unless
* the object has been modified more recently than a certain time.
* <p>
* A nonzero value gives a time as the number of seconds since
* January 1, 1970, GMT. The object is fetched only if it has been
* modified more recently than that time.
* <p>
* This variable is set by the <code>setIfModifiedSince</code>
* method. Its value is returned by the
* <code>getIfModifiedSince</code> method.
* <p>
* The default value of this field is <code>0</code>, indicating
* that the fetching must always occur.
*
* @see java.net.URLConnection#getIfModifiedSince()
* @see java.net.URLConnection#setIfModifiedSince(long)
* @since JDK1.0
*/
protected long ifModifiedSince = 0;
/**
* If <code>false</code>, this connection object has not created a
* communications link to the specified URL. If <code>true</code>,
* the communications link has been established.
*
* @since JDK1.0
*/
protected boolean connected = false;
/**
* @since JDK1.1
*/
private static FileNameMap fileNameMap;
/**
* Returns the FileNameMap.
*
* @returns the FileNameMap
* @since JDK1.1
*/
public static FileNameMap getFileNameMap() {
return fileNameMap;
}
/**
* Sets the FileNameMap.
*
* @param map the FileNameMap to be set
* @since JDK1.1
*/
public static void setFileNameMap(FileNameMap map) {
SecurityManager sm = System.getSecurityManager();
if (sm != null) sm.checkSetFactory();
fileNameMap = map;
}
/**
* Opens a communications link to the resource referenced by this
* URL, if such a connection has not already been established.
* <p>
* If the <code>connect</code> method is called when the connection
* has already been opened (indicated by the <code>connected</code>
* field having the value <code>true</code>), the call is ignored.
* <p>
* URLConnection objects go through two phases: first they are
* created, then they are connected. After being created, and
* before being connected, various options can be specified
* (e.g., doInput and UseCaches). After connecting, it is an
* error to try to set them. Operations that depend on being
* connected, like getContentLength, will implicitly perform the
* connection, if necessary.
*
* @exception IOException if an I/O error occurs while opening the
* connection.
* @see java.net.URLConnection#connected
* @since JDK1.0
*/
abstract public void connect() throws IOException;
/**
* Constructs a URL connection to the specified URL. A connection to
* the object referenced by the URL is not created.
*
* @param url the specified URL.
* @since JDK1.0
*/
protected URLConnection(URL url) {
this.url = url;
}
/**
* Returns the value of this <code>URLConnection</code>'s <code>URL</code>
* field.
*
* @return the value of this <code>URLConnection</code>'s <code>URL</code>
* field.
* @see java.net.URLConnection#url
* @since JDK1.0
*/
public URL getURL() {
return url;
}
/**
* Returns the value of the <code>content-length</code> header field.
*
* @return the content length of the resource that this connection's URL
* references, or <code>-1</code> if the content length is
* not known.
* @since JDK1.0
*/
public int getContentLength() {
return getHeaderFieldInt("content-length", -1);
}
/**
* Returns the value of the <code>content-type</code> header field.
*
* @return the content type of the resource that the URL references,
* or <code>null</code> if not known.
* @see java.net.URLConnection#getHeaderField(java.lang.String)
* @since JDK1.0
*/
public String getContentType() {
return getHeaderField("content-type");
}
/**
* Returns the value of the <code>content-encoding</code> header field.
*
* @return the content encoding of the resource that the URL references,
* or <code>null</code> if not known.
* @see java.net.URLConnection#getHeaderField(java.lang.String)
* @since JDK1.0
*/
public String getContentEncoding() {
return getHeaderField("content-encoding");
}
/**
* Returns the value of the <code>expires</code> header field.
*
* @return the expiration date of the resource that this URL references,
* or 0 if not known. The value is the number of seconds since
* January 1, 1970 GMT.
* @see java.net.URLConnection#getHeaderField(java.lang.String)
* @since JDK1.0
*/
public long getExpiration() {
return getHeaderFieldDate("expires", 0);
}
/**
* Returns the value of the <code>date</code> header field.
*
* @return the sending date of the resource that the URL references,
* or <code>0</code> if not known. The value returned is the
* number of seconds since January 1, 1970 GMT.
* @see java.net.URLConnection#getHeaderField(java.lang.String)
* @since JDK1.0
*/
public long getDate() {
return getHeaderFieldDate("date", 0);
}
/**
* Returns the value of the <code>last-modified</code> header field.
* The result is the number of seconds since January 1, 1970 GMT.
*
* @return the date the resource referenced by this
* <code>URLConnection</code> was last modified, or 0 if not known.
* @see java.net.URLConnection#getHeaderField(java.lang.String)
* @since JDK1.0
*/
public long getLastModified() {
return getHeaderFieldDate("last-modified", 0);
}
/**
* Returns the value of the specified header field. Names of
* header fields to pass to this method can be obtained from
* getHeaderFieldKey.
*
* @param name the name of a header field.
* @return the value of the named header field, or <code>null</code>
* if there is no such field in the header.
* @see java.net.URLConnection#getHeaderFieldKey(int)
* @since JDK1.0
*/
public String getHeaderField(String name) {
return null;
}
/**
* Returns the value of the named field parsed as a number.
* <p>
* This form of <code>getHeaderField</code> exists because some
* connection types (e.g., <code>http-ng</code>) have pre-parsed
* headers. Classes for that connection type can override this method
* and short-circuit the parsing.
*
* @param name the name of the header field.
* @param Default the default value.
* @return the value of the named field, parsed as an integer. The
* <code>Default</code> value is returned if the field is
* missing or malformed.
* @since JDK1.0
*/
public int getHeaderFieldInt(String name, int Default) {
try {
return Integer.parseInt(getHeaderField(name));
} catch(Throwable t) {}
return Default;
}
/**
* Returns the value of the named field parsed as date.
* The result is the number of seconds since January 1, 1970 GMT
* represented by the named field.
* <p>
* This form of <code>getHeaderField</code> exists because some
* connection types (e.g., <code>http-ng</code>) have pre-parsed
* headers. Classes for that connection type can override this method
* and short-circuit the parsing.
*
* @param name the name of the header field.
* @param Default a default value.
* @return the value of the field, parsed as a date. The value of the
* <code>Default</code> argument is returned if the field is
* missing or malformed.
* @since JDK1.0
*/
public long getHeaderFieldDate(String name, long Default) {
try {
return Date.parse(getHeaderField(name));
} catch(Throwable t) {}
return Default;
}
/**
* Returns the key for the <code>n</code><sup>th</sup> header field.
*
* @param n an index.
* @return the key for the <code>n</code><sup>th</sup> header field,
* or <code>null</code> if there are fewer than <code>n</code>
* fields.
* @since JDK1.0
*/
public String getHeaderFieldKey(int n) {
return null;
}
/**
* Returns the value for the <code>n</code><sup>th</sup> header field.
* It returns <code>null</code> if there are fewer than
* <code>n</code> fields.
* <p>
* This method can be used in conjunction with the
* <code>getHeaderFieldKey</code> method to iterate through all
* the headers in the message.
*
* @param n an index.
* @return the value of the <code>n</code><sup>th</sup> header field.
* @see java.net.URLConnection#getHeaderFieldKey(int)
* @since JDK1.0
*/
public String getHeaderField(int n) {
return null;
}
/**
* Retrieves the contents of this URL connection.
* <p>
* This method first determines the content type of the object by
* calling the <code>getContentType</code> method. If this is
* the first time that the application has seen that specific content
* type, a content handler for that content type is created:
* <ol>
* <li>If the application has set up a content handler factory instance
* using the <code>setContentHandlerFactory</code> method, the
* <code>createContentHandler</code> method of that instance is called
* with the content type as an argument; the result is a content
* handler for that content type.
* <li>If no content handler factory has yet been set up, or if the
* factory's <code>createContentHandler</code> method returns
* <code>null</code>, then the application loads the class named:
* <ul><code>
* sun.net.www.content.<<i>contentType</i>>
* </code></ul>
* where <<i>contentType</i>> is formed by taking the
* content-type string, replacing all slash characters with a
* <code>period</code> ('.'), and all other non-alphanumeric characters
* with the underscore character '<code>_</code>'. The alphanumeric
* characters are specifically the 26 uppercase ASCII letters
* '<code>A</code>' through '<code>Z</code>', the 26 lowercase ASCII
* letters '<code>a</code>' through '<code>z</code>', and the 10 ASCII
* digits '<code>0</code>' through '<code>9</code>'. If the specified
* class does not exist, or is not a subclass of
* <code>ContentHandler</code>, then an
* <code>UnknownServiceException</code> is thrown.
* </ol>
*
* @return the object fetched. The <code>instanceOf</code> operation
* should be used to determine the specific kind of object
* returned.
* @exception IOException if an I/O error occurs while
* getting the content.
* @exception UnknownServiceException if the protocol does not support
* the content type.
* @see java.net.ContentHandlerFactory#createContentHandler(java.lang.String)
* @see java.net.URLConnection#getContentType()
* @see java.net.URLConnection#setContentHandlerFactory(java.net.ContentHandlerFactory)
* @since JDK1.0
*/
public Object getContent() throws IOException {
return getContentHandler().getContent(this);
}
/**
* Returns an input stream that reads from this open connection.
*
* @return an input stream that reads from this open connection.
* @exception IOException if an I/O error occurs while
* creating the input stream.
* @exception UnknownServiceException if the protocol does not support
* input.
* @since JDK1.0
*/
public InputStream getInputStream() throws IOException {
throw new UnknownServiceException("protocol doesn't support input");
}
/**
* Returns an output stream that writes to this connection.
*
* @return an output stream that writes to this connection.
* @exception IOException if an I/O error occurs while
* creating the output stream.
* @exception UnknownServiceException if the protocol does not support
* output.
* @since JDK1.0
*/
public OutputStream getOutputStream() throws IOException {
throw new UnknownServiceException("protocol doesn't support output");
}
/**
* Returns a <code>String</code> representation of this URL connection.
*
* @return a string representation of this <code>URLConnection</code>.
* @since JDK1.0
*/
public String toString() {
return this.getClass().getName() + ":" + url;
}
/**
* Sets the value of the <code>doInput</code> field for this
* <code>URLConnection</code> to the specified value.
* <p>
* A URL connection can be used for input and/or output. Set the DoInput
* flag to true if you intend to use the URL connection for input,
* false if not. The default is true unless DoOutput is explicitly
* set to true, in which case DoInput defaults to false.
*
* @param value the new value.
* @see java.net.URLConnection#doInput
* @since JDK1.0
*/
public void setDoInput(boolean doinput) {
if (connected)
throw new IllegalAccessError("Already connected");
doInput = doinput;
}
/**
* Returns the value of this <code>URLConnection</code>'s
* <code>doInput</code> flag.
*
* @return the value of this <code>URLConnection</code>'s
* <code>doInput</code> flag.
* @see java.net.URLConnection#doInput
* @since JDK1.0
*/
public boolean getDoInput() {
return doInput;
}
/**
* Sets the value of the <code>doOutput</code> field for this
* <code>URLConnection</code> to the specified value.
* <p>
* A URL connection can be used for input and/or output. Set the DoOutput
* flag to true if you intend to use the URL connection for output,
* false if not. The default is false.
*
* @param value the new value.
* @see java.net.URLConnection#doOutput
* @since JDK1.0
*/
public void setDoOutput(boolean dooutput) {
if (connected)
throw new IllegalAccessError("Already connected");
doOutput = dooutput;
}
/**
* Returns the value of this <code>URLConnection</code>'s
* <code>doOutput</code> flag.
*
* @return the value of this <code>URLConnection</code>'s
* <code>doOutput</code> flag.
* @see java.net.URLConnection#doOutput
* @since JDK1.0
*/
public boolean getDoOutput() {
return doOutput;
}
/**
* Set the value of the <code>allowUserInteraction</code> field of
* this <code>URLConnection</code>.
*
* @param allowuserinteraction the new value.
* @see java.net.URLConnection#allowUserInteraction
* @since JDK1.0
*/
public void setAllowUserInteraction(boolean allowuserinteraction) {
if (connected)
throw new IllegalAccessError("Already connected");
allowUserInteraction = allowuserinteraction;
}
/**
* Returns the value of the <code>allowUserInteraction</code> field for
* this object.
*
* @return the value of the <code>allowUserInteraction</code> field for
* this object.
* @see java.net.URLConnection#allowUserInteraction
* @since JDK1.0
*/
public boolean getAllowUserInteraction() {
return allowUserInteraction;
}
/**
* Sets the default value of the
* <code>allowUserInteraction</code> field for all future
* <code>URLConnection</code> objects to the specified value.
*
* @param defaultallowuserinteraction the new value.
* @see java.net.URLConnection#allowUserInteraction
* @since JDK1.0
*/
public static void setDefaultAllowUserInteraction(boolean defaultallowuserinteraction) {
defaultAllowUserInteraction = defaultallowuserinteraction;
}
/**
* Returns the default value of the <code>allowUserInteraction</code>
* field.
* <p>
* Ths default is "sticky", being a part of the static state of all
* URLConnections. This flag applies to the next, and all following
* URLConnections that are created.
*
* @return the default value of the <code>allowUserInteraction</code>
* field.
* @see java.net.URLConnection#allowUserInteraction
* @since JDK1.0
*/
public static boolean getDefaultAllowUserInteraction() {
return defaultAllowUserInteraction;
}
/**
* Sets the value of the <code>useCaches</code> field of this
* <code>URLConnection</code> to the specified value.
* <p>
* Some protocols do caching of documents. Occasionally, it is important
* to be able to "tunnel through" and ignore the caches (e.g., the
* "reload" button in a browser). If the UseCaches flag on a connection
* is true, the connection is allowed to use whatever caches it can.
* If false, caches are to be ignored.
* The default value comes from DefaultUseCaches, which defaults to
* true.
*
* @see java.net.URLConnection#useCaches
* @since JDK1.0
*/
public void setUseCaches(boolean usecaches) {
if (connected)
throw new IllegalAccessError("Already connected");
useCaches = usecaches;
}
/**
* Returns the value of this <code>URLConnection</code>'s
* <code>useCaches</code> field.
*
* @return the value of this <code>URLConnection</code>'s
* <code>useCaches</code> field.
* @see java.net.URLConnection#useCaches
* @since JDK1.0
*/
public boolean getUseCaches() {
return useCaches;
}
/**
* Sets the value of the <code>ifModifiedSince</code> field of
* this <code>URLConnection</code> to the specified value.
*
* @param value the new value.
* @see java.net.URLConnection#ifModifiedSince
* @since JDK1.0
*/
public void setIfModifiedSince(long ifmodifiedsince) {
if (connected)
throw new IllegalAccessError("Already connected");
ifModifiedSince = ifmodifiedsince;
}
/**
* Returns the value of this object's <code>ifModifiedSince</code> field.
*
* @return the value of this object's <code>ifModifiedSince</code> field.
* @see java.net.URLConnection#ifModifiedSince
* @since JDK1.0
*/
public long getIfModifiedSince() {
return ifModifiedSince;
}
/**
* Returns the default value of a <code>URLConnection</code>'s
* <code>useCaches</code> flag.
* <p>
* Ths default is "sticky", being a part of the static state of all
* URLConnections. This flag applies to the next, and all following
* URLConnections that are created.
*
* @return the default value of a <code>URLConnection</code>'s
* <code>useCaches</code> flag.
* @see java.net.URLConnection#useCaches
* @since JDK1.0
*/
public boolean getDefaultUseCaches() {
return defaultUseCaches;
}
/**
* Sets the default value of the <code>useCaches</code> field to the
* specified value.
*
* @param defaultusecaches the new value.
* @see java.net.URLConnection#useCaches
* @since JDK1.0
*/
public void setDefaultUseCaches(boolean defaultusecaches) {
defaultUseCaches = defaultusecaches;
}
/**
* Sets the general request property.
*
* @param key the keyword by which the request is known
* (e.g., "<code>accept</code>").
* @param value the value associated with it.
* @since JDK1.0
*/
public void setRequestProperty(String key, String value) {
if (connected)
throw new IllegalAccessError("Already connected");
}
/**
* Returns the value of the named general request property for this
* connection.
*
* @return the value of the named general request property for this
* connection.
* @since JDK1.0
*/
public String getRequestProperty(String key) {
if (connected)
throw new IllegalAccessError("Already connected");
return null;
}
/**
* Sets the default value of a general request property. When a
* <code>URLConnection</code> is created, it is initialized with
* these properties.
*
* @param key the keyword by which the request is known
* (e.g., "<code>accept</code>").
* @param value the value associated with the key.
* @since JDK1.0
*/
public static void setDefaultRequestProperty(String key, String value) {
}
/**
* Returns the value of the default request property. Default request
* properties are set for every connection.
*
* @return the value of the default request property for the specified key.
* @see java.net.URLConnection#setDefaultRequestProperty(java.lang.String, java.lang.String)
* @since JDK1.0
*/
public static String getDefaultRequestProperty(String key) {
return null;
}
/**
* The ContentHandler factory.
*/
static ContentHandlerFactory factory;
/**
* Sets the <code>ContentHandlerFactory</code> of an
* application. It can be called at most once by an application.
* <p>
* The <code>ContentHandlerFactory</code> instance is used to
* construct a content handler from a content type
*
* @param fac the desired factory.
* @exception Error if the factory has already been defined.
* @see java.net.ContentHandlerFactory
* @see java.net.URLConnection#getContent()
* @since JDK1.0
*/
public static synchronized void setContentHandlerFactory(ContentHandlerFactory fac) {
if (factory != null) {
throw new Error("factory already defined");
}
SecurityManager security = System.getSecurityManager();
if (security != null) {
security.checkSetFactory();
}
factory = fac;
}
private static Hashtable handlers = new Hashtable();
private static ContentHandler UnknownContentHandlerP = new UnknownContentHandler();
/**
* Gets the Content Handler appropriate for this connection.
* @param connection the connection to use.
*/
synchronized ContentHandler getContentHandler()
throws UnknownServiceException
{
String contentType = getContentType();
ContentHandler handler = null;
if (contentType == null)
throw new UnknownServiceException("no content-type");
try {
handler = (ContentHandler) handlers.get(contentType);
if (handler != null)
return handler;
} catch(Exception e) {
}
if (factory != null)
handler = factory.createContentHandler(contentType);
if (handler == null) {
try {
handler = lookupContentHandlerClassFor(contentType);
} catch(Exception e) {
e.printStackTrace();
handler = UnknownContentHandlerP;
}
handlers.put(contentType, handler);
}
return handler;
}
private static final String contentClassPrefix = "sun.net.www.content";
private static final String contentPathProp = "java.content.handler.pkgs";
/**
* Looks for a content handler in a user-defineable set of places.
* By default it looks in sun.net.www.content, but users can define a
* vertical-bar delimited set of class prefixes to search through in
* addition by defining the java.content.handler.pkgs property.
* The class name must be of the form:
* <pre>
* {package-prefix}.{major}.{minor}
* e.g.
* YoyoDyne.experimental.text.plain
* </pre>
*/
private ContentHandler lookupContentHandlerClassFor(String contentType)
throws InstantiationException, IllegalAccessException, ClassNotFoundException {
String contentHandlerClassName = typeToPackageName(contentType);
String contentHandlerPkgPrefixes = getContentHandlerPkgPrefixes();
StringTokenizer packagePrefixIter =
new StringTokenizer(contentHandlerPkgPrefixes, "|");
while (packagePrefixIter.hasMoreTokens()) {
String packagePrefix = packagePrefixIter.nextToken().trim();
try {
String name = packagePrefix + "." + contentHandlerClassName;
ContentHandler handler =
(ContentHandler) Class.forName(name).newInstance();
return handler;
} catch(Exception e) {
}
}
return UnknownContentHandlerP;
}
/**
* Utility function to map a MIME content type into an equivalent
* pair of class name components. For example: "text/html" would
* be returned as "text.html"
*/
private String typeToPackageName(String contentType) {
int len = contentType.length();
char nm[] = new char[len];
contentType.getChars(0, len, nm, 0);
for (int i = 0; i < len; i++) {
char c = nm[i];
if (c == '/') {
nm[i] = '.';
} else if (!('A' <= c && c <= 'Z' ||
'a' <= c && c <= 'z' ||
'0' <= c && c <= '9')) {
nm[i] = '_';
}
}
return new String(nm);
}
/**
* Returns a vertical bar separated list of package prefixes for potential
* content handlers. Tries to get the java.content.handler.pkgs property
* to use as a set of package prefixes to search. Whether or not
* that property has been defined, the sun.net.www.content is always
* the last one on the returned package list.
*/
private String getContentHandlerPkgPrefixes() {
String packagePrefixList = System.getProperty(contentPathProp, "");
if (packagePrefixList != "") {
packagePrefixList += "|";
}
return packagePrefixList + contentClassPrefix;
}
/**
* Tries to determine the content type of an object, based
* on the specified "file" component of a URL.
* This is a convenience method that can be used by
* subclasses that override the <code>getContentType</code> method.
*
* @param fname a filename.
* @return a guess as to what the content type of the object is,
* based upon its file name.
* @see java.net.URLConnection#getContentType()
* @since JDK1.0
*/
protected static String guessContentTypeFromName(String fname) {
String contentType = null;
if (fileNameMap != null) {
contentType = fileNameMap.getContentTypeFor(fname);
}
return contentType;
}
/**
* Tries to determine the type of an input stream based on the
* characters at the beginning of the input stream. This method can
* be used by subclasses that override the
* <code>getContentType</code> method.
* <p>
* Ideally, this routine would not be needed. But many
* <code>http</code> servers return the incorrect content type; in
* addition, there are many nonstandard extensions. Direct inspection
* of the bytes to determine the content type is often more accurate
* than believing the content type claimed by the <code>http</code> server.
*
* @param is an input stream that supports marks.
* @return a guess at the content type, or <code>null</code> if none
* can be determined.
* @exception IOException if an I/O error occurs while reading the
* input stream.
* @see java.io.InputStream#mark(int)
* @see java.io.InputStream#markSupported()
* @see java.net.URLConnection#getContentType()
* @since JDK1.0
*/
static public String guessContentTypeFromStream(InputStream is) throws IOException
{
is.mark(10);
int c1 = is.read();
int c2 = is.read();
int c3 = is.read();
int c4 = is.read();
int c5 = is.read();
int c6 = is.read();
is.reset();
if (c1 == 0xCA && c2 == 0xFE && c3 == 0xBA && c4 == 0xBE)
return "application/java-vm";
if (c1 == 0xAC && c2 == 0xED)
// next two bytes are version number, currently 0x00 0x05
return "application/x-java-serialized-object";
if (c1 == 'G' && c2 == 'I' && c3 == 'F' && c4 == '8')
return "image/gif";
if (c1 == '#' && c2 == 'd' && c3 == 'e' && c4 == 'f')
return "image/x-bitmap";
if (c1 == '!' && c2 == ' ' && c3 == 'X' && c4 == 'P' && c5 == 'M' && c6 == '2')
return "image/x-pixmap";
if (c1 == '<')
if (c2 == '!'
|| (c6 == '>'
&& (c2 == 'h' && (c3 == 't' && c4 == 'm' && c5 == 'l' ||
c3 == 'e' && c4 == 'a' && c5 == 'd')
|| c2 == 'b' && c3 == 'o' && c4 == 'd' && c5 == 'y')))
return "text/html";
if (c1 == 0x2E && c2 == 0x73 && c3 == 0x6E && c4 == 0x64)
return "audio/basic"; // .au format, big endian
if (c1 == 0x64 && c2 == 0x6E && c3 == 0x73 && c4 == 0x2E)
return "audio/basic"; // .au format, little endian
if (c1 == '<')
if (c2 == '!'
|| ((c2 == 'h' && (c3 == 't' && c4 == 'm' && c5 == 'l' ||
c3 == 'e' && c4 == 'a' && c5 == 'd')
|| c2 == 'b' && c3 == 'o' && c4 == 'd' && c5 == 'y'))
|| ((c2 == 'H' && (c3 == 'T' && c4 == 'M' && c5 == 'L' ||
c3 == 'E' && c4 == 'A' && c5 == 'D')
|| c2 == 'B' && c3 == 'O' && c4 == 'D' && c5 == 'Y')))
return "text/html";
if (c1 == 0xFF && c2 == 0xD8 && c3 == 0xFF && c4 == 0xE0)
return "image/jpeg";
if (c1 == 0xFF && c2 == 0xD8 && c3 == 0xFF && c4 == 0xEE)
return "image/jpg";
if (c1 == 'R' && c2 == 'I' && c3 == 'F' && c4 == 'F')
/* I don't know if this is official but evidence
* suggests that .wav files start with "RIFF" - brown
*/
return "audio/x-wav";
return null;
}
}
class UnknownContentHandler extends ContentHandler {
public Object getContent(URLConnection uc) throws IOException {
return uc.getInputStream();
}
}
⏎ java/net/URLConnection.java
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