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The URLConnection class is used to send HTTP requests and read HTTP responses URLConnection has methods that allow you to connect to a Web server, to set request header fields, to read response header fields, and of course, to read the contents of the resource 9241 Creating a URLConnection There are no public constructors for the URLConnection class The single constructor for URLConnection is marked as a protected method, meaning that only a class in the javanet package can create one Instead, you should call the URLopenConnection() method, which will return a URLConnection instance
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URL url = new URL ( some_url ); URLConnection connection = urlopenConnection();
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9242 Using a URLConnection The URLConnection provides many methods, the most important of which are listed below Some are shortcuts to other methods (such as response header fields) For completeness, even advanced methods are included, although for normal programming you would likely use a small subset of these Methods
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void connect() throws javaioIOException establishes a connection
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between the application (the client) and the resource (stored on the server) The act of creating a URLConnection object does not establish this connection, and until this method is executed, the remote host will not be contacted Before invoking this method, the client application should specify any request headers, as these will be sent when the connection is made Some URLConnection methods will call the connect() method in order to complete their task boolean getAllowUserInteraction() returns the state of the "allowUserInteraction" field, which indicates whether the URL is being used in a way that supports user interaction, such as providing authentication details Object getContent() throws javaioIOException attempts to process the contents of a resource and return it as an Object The method checks the MIME content type of the resource and attempts to find a suitable content handler String getContentEncoding() returns the value of the "Content-encoding" header field, if such a field exists Returns null if no content-encoding field was specified int getContentLength() returns the value of the "Content-length" header field, if such a field exists Returns 1 if no content-length field was specified String getContentType() returns the value of the "Content-type" header field, if such a field exists Returns null if no content-type field was specified If no type of information is available, the guessContentTypeFromStream(InputStream) method may be used as an indication long getDate() returns the value of the "Date" header field, expressed as the number of seconds since January 1, 1970 GMT If no such header field was specified, a value of zero will be returned static boolean getDefaultAllowUserInteractionField() returns the default value for the "allowUserInteraction" field The state of this default value determines the "allowUserInteraction" value of all future URLConnection objects that are created static String getDefaultRequestProperty(String key) returns the value of the specified default property, applied to all URLConnection objects Returns null if no such property exists
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boolean getDefaultUseCaches() returns the default value of the cache flag The state of this default value determines the cache flag value of all future URLConnection objects that are created boolean getDoInput() returns a flag, indicating whether the connection should be used for input By default, this value will be "true," unless modified by the setDoInput(boolean) method boolean getDoOutput() returns a flag indicating whether the connection should be used for output By default, this value will be "false," unless modified by the setDoOutput(boolean) method long getExpiration() returns the value of the "Expires" header field, expressed as the number of seconds since January 1, 1970 GMT If no such header field was specified, a value of zero will be returned static FileNameMap getFileNameMap() returns an object that implements the FileNameMap interface, which is used to map MIME content types to filenames The content type for a resource may also be determined by calling the getContentType() method String getHeaderField(int n) returns the value of the nth response header field, or null if this exceeds the number of response header fields available Unlike an array, which is zero-indexed, the first element of the set of header fields will have an index value of one String getHeaderField(String field) returns the value of the specified header field name, or null if no such field exists long getHeaderFieldDate (String field, long default_value) attempts to parse the specified header field name as a date, expressed as the number of seconds since January 1, 1970 GMT If a parsing error occurs (such as an invalid date or a missing header field), the default_value will be returned int getHeaderFieldInt (String field, int default_value) attempts to parse the specified header field as a number If a parsing error occurs (such as an invalid number), the default_value will be returned String getHeaderFieldKey(int n) returns the name of the nth response header field, or null if this exceeds the number of response header fields available Unlike an array, which is zero-indexed, the first element of the set of header fields will have an index value of one long getIfModifiedSince() returns the date of the "If-Modified-Since" request header field This field is modified by calling the setIfModifiedSince(long) method InputStream getInputStream() throws javaioIOException, java netUnknownServiceException returns an InputStream object that reads the contents of the resource pointed to by the URLConnection If a connection cannot be established, an IOException is thrown In addition, if the connection does not support reading, an UnknownServiceException is thrown long getLastModified() returns the date of the "Last-Modified header field, expressed as the number of seconds since January 1, 1970 GMT If no such header field was specified, a value of zero will be returned OutputStream getOutputStream() throws javaioIOException, javanetUnknownServiceException returns an OutputStream object that writes to the remote connection If a connection cannot be established, an IOException is thrown In addition, if the connection does not support writing, an UnknownServiceException is thrown Permission getPermission() throws javaioIOException returns a Permission object, representing the security permissions required to access a resource If a specialized subclass of URLConnection is written, this method should be overridden Developers won't normally need to use this method, unless special security policies are specified for an application
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