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A Sampling of Methods Defined by ServletRequest
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GenericServlet adds one method of its own called log( ) that appends a string to the server log file Two versions are provided and shown here: void log(String str) void log(String str, Throwable exc) Here, str is the string to be appended to the log, and exc is an exception that occurred
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Applets and Servlets
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Method String getCharacterEncoding( ) ServletOutputStream getOutputStream( ) throws IOException PrintWriter getWriter( ) throws IOException
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Description Returns the character encoding for the response 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 Sets the content length for the response to size Sets the content type for the response to type
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void setContentLength(int size) void setContentType(String type)
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TABLE 6-4 A Sampling of Methods Defined by ServletResponse
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The Servlet Exception Classes
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The javaxservlet package defines two exceptions The first is ServletException, which indicates that a servlet problem has occurred The second is UnavailableException, which extends ServletException It indicates that a servlet is unavailable
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The javaxservlethttp Package
The javaxservlethttp package supplies interfaces and classes that make it easier to build servlets that work with HTTP requests and responses The interfaces used in this chapter are HttpServletRequest and HttpServletResponse HttpServletRequest extends ServletRequest and enables a servlet to read data from an HTTP request HttpServletResponse extends ServletReponse and enables a servlet to write data to an HTTP response The classes used in this chapter are HttpServlet and Cookie HttpServlet provides methods to handle HTTP requests and responses Cookie encapsulates a cookie Each is examined in greater detail by the following sections
The HttpServletRequest Interface
The HttpServletRequest interface enables a servlet to obtain information about a client request It extends ServletRequest and adds methods related to HTTP requests A sampling of its methods is shown in Table 6-5
The HttpServletResponse Interface
The HttpServletResponse interface enables a servlet to formulate an HTTP response to a client Several constants are defined These correspond to the different status codes that can be assigned to an HTTP response For example, SC_OK indicates that the HTTP request succeeded, and SC_NOT_FOUND indicates that the requested resource is not available A sampling of methods of this interface is shown in Table 6-6
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Method String getAuthType( ) Cookie[ ] getCookies( ) String getHeader(String hName) Enumeration getHeaderNames( ) int getIntHeader(String hName)
Description Returns authentication scheme Returns an array of the cookies in this request Returns the value of the header named hName Returns null if the header is not found Returns an enumeration of the header names Returns the int equivalent of the header named hName If the header is not found, 1 is returned A NumberFormatException is thrown if a conversion error occurs Returns a string that contains the name of the HTTP method for this request Returns any path information that is located after the servlet path and before a query string of the URL Returns any path information that is located after the servlet path and before a query string of the URL after translating it to a real path Returns the query string Returns null if no query string is found Returns the name of the user who issued this request Returns the ID of the session Returns the URI Returns the URL Returns that part of the URL that identifies the servlet Returns the session for this request If a session does not exist, one is created and then returned If new is true and no session exists, creates and returns a session for this request Otherwise, returns the existing session for this request Returns null if no session exists and new is false Returns true if a cookie contains the session ID Otherwise, returns false Returns true if the URL contains the session ID Otherwise, returns false Returns true if the requested session ID is valid in the current session context
String getMethod( ) String getPathInfo( )
String getPathTranslated( )
String getQueryString( ) String getRemoteUser( ) String getRequestedSessionId( ) String getRequestURI( ) StringBuffer getRequestURL( ) String getServletPath( ) HttpSession getSession( ) HttpSession getSession(boolean new)
boolean isRequestedSessionIdFromCookie( ) boolean isRequestedSessionIdFromURL( ) boolean isRequestedSessionIdValid( )
TABLE 6-5
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