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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