webcontent目录下的jsp:
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<form action="Servlet1" method="post">
<table>
<tr>
<td>姓名：</td>
<td><input type="text" name="name"></td>
</tr>
<tr>
<td>ename：</td>
<td><input type="text" name="ename"></td>
</tr>
</table>
<button class="submit">提交</button>
</form>
</body>
</html>
servlet包里面的Servlet1：
package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.catalina.Session;
/**
* Servlet implementation class Servlet1
*/
@WebServlet("/Servlet1")
public class Servlet1 extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public Servlet1() {
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
//response.setContentType("text/html;charset=utf-8");
// request.setCharacterEncoding("utf-8");
PrintWriter out=response.getWriter();
String info=request.getParameter("name");
String ename=request.getParameter("ename");
out.println(info);
out.println(ename);
out.close();
}
/**
* @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);
}
}
filter包里面的：
package filter;
import java.io.IOException;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
/**
* Servlet Filter implementation class EncodingFilter
*/
@WebFilter("/EncodingFilter")
public class EncodingFilter implements Filter {
private String encoding;
/**
* @see Filter#destroy()
*/
public void destroy() {
// TODO Auto-generated method stub
System.out.println("end do the encoding filter");
encoding=null;
}
/**
* @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
*/
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
// TODO Auto-generated method stub
// place your code here
// pass the request along the filter chain
System.out.println("before encoding"+encoding+"filter");
request.setCharacterEncoding(encoding);
response.setContentType("text/html;charset="+encoding);
chain.doFilter(request, response);
System.out.println("after encoding"+encoding+"filter");
}
/**
* @see Filter#init(FilterConfig)
*/
public void init(FilterConfig fConfig) throws ServletException {
// TODO Auto-generated method stub
System.out.println("begin do the encoding filter");
encoding=fConfig.getInitParameter("encoding");
}
}
web.xml的配置：
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<display-name>JavaEETask1</display-name>
<filter>
<filter-name>setCE</filter-name>
<filter-class>filter.EncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>utf-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>setCE</filter-name>
<url-pattern>/JavaEETask1/Servlet1</url-pattern>
</filter-mapping>
</web-app>为什么过滤器不起作用啊？？求指点
3 回答
柒月君
TA贡献2条经验 获得超0个赞
<url-pattern>/JavaEETask1/Servlet1</url-pattern>
应该是/servlet/Servlet1吧
好久不用了 不好使还不报错 应该是配置问题 没有扫到
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