20151203--filter

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Strict//EN" "http://www.w3.org/TR/html4/strict.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

<title>Insert title here</title>

</head>

<body>

<form id="uform" action="saveUser">      

用户代码：<input id="userid" type="text" name="userid" width=30 />

<br><br>

用户名称：<input id="username" type="text" name="username" width=30 />

<br><br>

登录密码：<input id="password" type="password" name="password" width=30 />

<br><br>

确认密码：<input id="passwore" type="password" name="pueren" width=30 />

<br><br>

<input type="submit" value="提交" />

</form>

</body>

</html>

index

package com.hanqi;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

 * Servlet implementation class saveUser

 */

public class saveUser extends HttpServlet {

    private static final long serialVersionUID = 1L;

    /**

     * @see HttpServlet#HttpServlet()

     */

    public saveUser() {

        super();

        // TODO Auto-generated constructor stub

    }

    /**

     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)

     */

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        // TODO Auto-generated method stub

        //获取

        String strUserName = request.getParameter("username");

        //转码

        //response.setCharacterEncoding("UTF-8");//输入的是UTF-8

        //response.setContentType("text/html;charset=UTF-8");//返回的是UTF-8

        //判断

        if(strUserName != null)

        {

            //初始化

            strUserName = new String(strUserName.getBytes("ISO-8859-1"),"UTF-8");

            response.getWriter().append("strUserName = " + strUserName);

        }

        response.getWriter().append("Served at: ").append(request.getContextPath());

    }

    /**

     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)

     */

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        // TODO Auto-generated method stub

        doGet(request, response);

    }

}

SaveUser

package com.hanqi;

import java.io.IOException;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

/**

 * Servlet Filter implementation class MyFilter

 */

public class MyFilter implements Filter {

    /**

     * Default constructor.

     */

    public MyFilter() {

        // TODO Auto-generated constructor stub

    }

    /**

     * @see Filter#destroy()

     */

    public void destroy() {

        // TODO Auto-generated method stub

    }

    /**

     * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)

     */

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {

        String userID = request.getParameter("userid");

        if(userID == null || userID.trim().length() == 0)

        {

            response.getWriter().append("userid  is  error");

        }

        else

        {

            //本句添加在过滤器最下方，用于传递给下一个过滤器或目标页面，构成过滤链条

            chain.doFilter(request, response);

        }

    }

    /**

     * @see Filter#init(FilterConfig)

     */

    public void init(FilterConfig fConfig) throws ServletException {

        // TODO Auto-generated method stub

    }

}

MyFilter

package com.hanqi;

import java.io.IOException;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

/**

 * Servlet Filter implementation class Test2

 */

public class Test2 implements Filter {

    /**

     * Default constructor.

     */

    public Test2() {

        // TODO Auto-generated constructor stub

    }

    /**

     * @see Filter#destroy()

     */

    public void destroy() {

        // TODO Auto-generated method stub

    }

    /**

     * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)

     */

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {

        response.setCharacterEncoding("UTF-8");//输入的是UTF-8

        response.setContentType("text/html;charset=UTF-8");//返回的是UTF-8

        chain.doFilter(request, response);

    }

    /**

     * @see Filter#init(FilterConfig)

     */

    public void init(FilterConfig fConfig) throws ServletException {

        // TODO Auto-generated method stub

    }

}

Test2

package com.hanqi;

import javax.servlet.ServletContextAttributeEvent;

import javax.servlet.ServletContextAttributeListener;

import javax.servlet.ServletContextEvent;

import javax.servlet.ServletContextListener;

import javax.servlet.ServletRequestAttributeEvent;

import javax.servlet.ServletRequestAttributeListener;

import javax.servlet.ServletRequestEvent;

import javax.servlet.ServletRequestListener;

import javax.servlet.http.HttpSessionActivationListener;

import javax.servlet.http.HttpSessionAttributeListener;

import javax.servlet.http.HttpSessionBindingEvent;

import javax.servlet.http.HttpSessionBindingListener;

import javax.servlet.http.HttpSessionEvent;

import javax.servlet.http.HttpSessionListener;

/**

 * Application Lifecycle Listener implementation class TextListener

 *

 */

public class TextListener implements ServletContextListener, ServletContextAttributeListener, HttpSessionListener, HttpSessionAttributeListener, HttpSessionActivationListener, HttpSessionBindingListener, ServletRequestListener, ServletRequestAttributeListener {

    /**

     * Default constructor.

     */

    public TextListener() {

        // TODO Auto-generated constructor stub

    }

    /**

     * @see ServletRequestListener#requestDestroyed(ServletRequestEvent)

     */

    public void requestDestroyed(ServletRequestEvent arg0)  {

         // TODO Auto-generated method stub

    }

    /**

     * @see HttpSessionAttributeListener#attributeAdded(HttpSessionBindingEvent)

     */

    public void attributeAdded(HttpSessionBindingEvent arg0)  {

         // TODO Auto-generated method stub

    }

    /**

     * @see ServletContextListener#contextInitialized(ServletContextEvent)

     */

    public void contextInitialized(ServletContextEvent arg0)  {

         // TODO Auto-generated method stub

    }

    /**

     * @see HttpSessionActivationListener#sessionDidActivate(HttpSessionEvent)

     */

    public void sessionDidActivate(HttpSessionEvent arg0)  {

         // TODO Auto-generated method stub

    }

    /**

     * @see HttpSessionBindingListener#valueBound(HttpSessionBindingEvent)

     */

    public void valueBound(HttpSessionBindingEvent arg0)  {

         // TODO Auto-generated method stub

    }

    /**

     * @see ServletContextAttributeListener#attributeAdded(ServletContextAttributeEvent)

     */

    public void attributeAdded(ServletContextAttributeEvent arg0)  {

         // TODO Auto-generated method stub

    }

    /**

     * @see ServletContextAttributeListener#attributeRemoved(ServletContextAttributeEvent)

     */

    public void attributeRemoved(ServletContextAttributeEvent arg0)  {

         // TODO Auto-generated method stub

    }

    /**

     * @see HttpSessionListener#sessionDestroyed(HttpSessionEvent)

     */

    public void sessionDestroyed(HttpSessionEvent arg0)  {

         // TODO Auto-generated method stub

    }

    /**

     * @see HttpSessionAttributeListener#attributeRemoved(HttpSessionBindingEvent)

     */

    public void attributeRemoved(HttpSessionBindingEvent arg0)  {

         // TODO Auto-generated method stub

    }

    /**

     * @see ServletRequestAttributeListener#attributeAdded(ServletRequestAttributeEvent)

     */

    public void attributeAdded(ServletRequestAttributeEvent arg0)  {

         // TODO Auto-generated method stub

    }

    /**

     * @see HttpSessionBindingListener#valueUnbound(HttpSessionBindingEvent)

     */

    public void valueUnbound(HttpSessionBindingEvent arg0)  {

         // TODO Auto-generated method stub

    }

    /**

     * @see HttpSessionActivationListener#sessionWillPassivate(HttpSessionEvent)

     */

    public void sessionWillPassivate(HttpSessionEvent arg0)  {

         // TODO Auto-generated method stub

    }

    /**

     * @see HttpSessionListener#sessionCreated(HttpSessionEvent)

     */

    public void sessionCreated(HttpSessionEvent arg0)  {

         // TODO Auto-generated method stub

    }

    /**

     * @see HttpSessionAttributeListener#attributeReplaced(HttpSessionBindingEvent)

     */

    public void attributeReplaced(HttpSessionBindingEvent arg0)  {

         // TODO Auto-generated method stub

    }

    /**

     * @see ServletContextAttributeListener#attributeReplaced(ServletContextAttributeEvent)

     */

    public void attributeReplaced(ServletContextAttributeEvent arg0)  {

         // TODO Auto-generated method stub

    }

    /**

     * @see ServletRequestAttributeListener#attributeRemoved(ServletRequestAttributeEvent)

     */

    public void attributeRemoved(ServletRequestAttributeEvent arg0)  {

         // TODO Auto-generated method stub

    }

    /**

     * @see ServletContextListener#contextDestroyed(ServletContextEvent)

     */

    public void contextDestroyed(ServletContextEvent arg0)  {

         // TODO Auto-generated method stub

    }

    /**

     * @see ServletRequestAttributeListener#attributeReplaced(ServletRequestAttributeEvent)

     */

    public void attributeReplaced(ServletRequestAttributeEvent arg0)  {

         // TODO Auto-generated method stub

    }

    /**

     * @see ServletRequestListener#requestInitialized(ServletRequestEvent)

     */

    public void requestInitialized(ServletRequestEvent arg0)  {

         // TODO Auto-generated method stub

    }

}

TextListener

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