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  J2EE Example of Filter
  Add Date : 2018-11-21      
  Javax.servlet.Filter class has three main methods.

public void destroy (); // destroy the object
public void doFilter (ServletRequest request, ServletResponse response, FilterChain chain); Filter response code // write In this method
public void init (FilterConfig fConfig); // initialize objects

First create a web project, the establishment of two JSP pages, and the procedure main article on the use of the death doFilter () method, to jump from index1.jsp index2.jsp.

Establish good index1.jsp page and index2.jsp.

Click WEB.xml following configuration, configuration WEB.xml the Servlet Filter and configuration as the class name and class package, then the map is very simple.

< Filter>
  < Filter-name> filter < / filter-name>
  < Filter-class> com.Filter < / filter-class>
  < / Filter>
  < Filter-mapping>
  < Filter-name> filter // should be consistent with the above filter-name
  < Url-pattern> *. Action // Any .action end of the page request can be returned to the filter
  < / Filter-mapping>

Then index1.jsp page, just write a

Click here to jump caused index2.jsp

Test whether you can successfully jump, index2.jsp content easily (this is my page!).

Next is the configuration package com Filter class doFilter () method. Specific code as follows:

HttpServletRequest req = (HttpServletRequest) request;
        String path = req.getServletPath (); // This method only HttpServletRequest class has to obtain a path to the page response
        System.out.println (path);
        if ( "/ forward.action" .equals (path)) {// If they are consistent with the jump in href index1.jsp the address index2.jsp
            request.getRequestDispatcher ( "index2.jsp") forward (request, response).;
        } Else {// if not jump index3.jsp page
            request.getRequestDispatcher ( "index3.jsp") forward (request, response).;
        chain.doFilter (request, response);

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