visual basic 2010 barcode generator The ServletRequest Interface in Java

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The ServletRequest Interface
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The ServletRequest interface is implemented by the server It enables a servlet to obtain information about a client request Its methods are summarized in Table 27-3 Table 27-3 The Methods Defined by ServletRequest
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String getAttribute(String attr) String getCharacterEncoding( ) int getContentLength( )
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Returns the value of the attribute named attr Returns the character encoding of the request Returns the size of the request The value 1 is returned if the size is not known Returns the type of the request A null value is returned if the type cannot be determined
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String getContentType( )
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ServletInputStream getInputStream( Returns a ServletInputStream that can be used ) to read binary data from the request An throws IOException IllegalStateException is thrown if getReader( ) has already been invoked for this request String getParameter(String pname) Returns the value of the parameter named pname
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Enumeration getParameterNames( ) Returns an enumeration of the parameter names for this request String[ ] getParameterValues( ) Returns an enumeration of the parameter values for this request Returns a description of the protocol Returns a buffered reader that can be used to read text from the request An IllegalStateException is thrown if getInputStream( ) has already been invoked for this request Returns the real path corresponding to the virtual path vpath Returns the string equivalent of the client IP address Returns the string equivalent of the client host name Returns the transmission scheme of the URL used for the request (eg "http", "ftp") Returns the name of the server Returns the port number
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String getProtocol( ) BufferedReader getReader( ) throws IOException
String getRealPath(String vpath)
String getRemoteAddr( )
String getRemoteHost( )
String getScheme( )
String getServerName( ) int getServerPort( )
The ServletResponse Interface
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The ServletResponse interface is implemented by the server It enables a servlet to formulate a response for a client Its methods are summarized in Table 27-4 Table 27-4 The Methods Defined by ServletResponse
Method
Description
String getCharacterEncoding( ) Returns the character encoding for the response ServletOutputStream getOutputStream( ) throws IOException Returns a ServletOutputStream that can be used to write binary data to the response An IllegalStateException is thrown if getWriter( ) has already been invoked for this request Returns a PrintWriter that can be used to write character data to the response An IllegalStateException is thrown if getOutputStream( ) has already been invoked for this request
PrintWriter getWriter( ) throws IOException
void setContentLength(int size) Sets the content length for the response to size void setContentType(String type) Sets the content type for the response to type
The SingleThreadModel Interface
The SingleThreadModel interface is used to indicate that only a single thread should execute the service( ) method of a servlet It defines no constants and declares no methods If a servlet implements this interface, the server creates several instances of it When a client request arrives, it is sent to an available instance of the servlet
The GenericServlet Class
The GenericServlet class provides implementations of the basic life cycle methods for a servlet and is typically subclassed by servlet developers GenericServlet implements the Servlet and ServletConfig interfaces In addition, a method to append a string to the server log file is available The signature of this method is shown here: void log(String s) Here, s is the string to be appended to the log
The ServletInputStream Class
The ServletInputStream class extends InputStream It is implemented by the server and provides an input stream that a servlet developer can use to read the data from a client request It defines the default constructor In addition, a method is provided to read bytes from the stream Its signature is shown here: int readLine(byte[ ] buffer, int offset, int size) throws IOException
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Here, buffer is the array into which size bytes are placed starting at offset The method returns the actual number of bytes read, or 1 if an end-of-stream condition is encountered
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