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使用Filter解决中文乱码问题

2016-04-15 16:15 441 查看

在使用jsp的时候，总会遇到中文乱码问题，几天不会的Filter 解决中文乱码的问题，今天解决了。。。也不知到什么原因，以前的400,错误消失啦，赶紧记录下。。。

1.index.jsp

<!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>
<h1>用Filter解决中文乱码问题</h1>
<hr/>
<form action="display" method="post">
姓名:<input type="text" name="name"/>
<input type="submit" value="Submit"/>
</form>
</body>
</html>

2.接下来则是，对于提交的到display的表单，添加servlet，新建cn.edu.hpu.servlet包，在包下创建DispalyServlet的Servlet

DispalyServlet.java

package cn.edu.hpu.servlet;

import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
* Servlet implementation class DispalyServlet
*/
@WebServlet("/display")<span style="background-color: rgb(204, 0, 0);">//注意这里的url</span>
public class DispalyServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public DispalyServlet() {
super();
// TODO Auto-generated constructor stub
}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
System.out.println("Message from display servlet.");
response.setCharacterEncoding("utf8");
request.getRequestDispatcher("/display.jsp").forward(request, response);
}

}

3.接收页面 display.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>
您输入的姓名是:<%=request.getParameter("name") %>
</body>
</html>

4.这里是最重要的，添加过滤Filter

package cn.hpu.edu.filter;

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;
import javax.servlet.annotation.WebFilter;

/**
* Servlet Filter implementation class FilterServlet
*/
@WebFilter("/*")
public class FilterServlet implements Filter {
private FilterConfig config = null;
/**
* Default constructor.
*/
public FilterServlet() {
// 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 {
// TODO Auto-generated method stub
// place your code here

// pass the request along the filter chain
<span style="background-color: rgb(255, 153, 102);">System.out.println("Message from before encoding filter.");
String encoding = config.getInitParameter("encoding");
request.setCharacterEncoding(encoding);
response.setCharacterEncoding(encoding);
chain.doFilter(request, response);
System.out.println("Message after before encoding filter.");</span>
}

/**
* @see Filter#init(FilterConfig)
*/
public void init(FilterConfig config) throws ServletException {
// TODO Auto-generated method stub
this.config = config;
}

}

同时要在web.xml中配置Filter的初始化内容

<filter>
<filter-name>endodingFilter</filter-name>
<filter-class>cn.hpu.edu.filter.FilterServlet</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>endodingFilter</filter-name>
<url-pattern>/*</url-pattern>   <!-- 我们要过滤所有的文件，解决所有的中文呢乱码问题，所以url设置为/* -->
</filter-mapping>

到这里，我们就实现了用Filter解决中文乱码问题

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