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通过过滤器解决post方式请求参数编码问题和响应编码问题

2016-09-16 10:16 567 查看

1。SetCharacterEncodingFilter.java文件：

package com.itheima.encoding;

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;
//解决post方式请求参数和响应编码问题的过滤器
public class SetCharacterEncodingFilter implements Filter {

private FilterConfig filterConfig;
public void init(FilterConfig filterConfig) throws ServletException {
this.filterConfig = filterConfig;
}

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

String encoding = filterConfig.getInitParameter("encoding");//用户可能忘记了配置该参数
if(encoding==null){
encoding = "UTF-8";//默认编码
}

request.setCharacterEncoding(encoding);//只能解决POST请求参数的中文问题
response.setCharacterEncoding(encoding);//输出流编码
response.setContentType("text/html;charset="+encoding);//输出流编码，通知了客户端应该使用的编码
chain.doFilter(request, response);
}

public void destroy() {

}

}

2。web.xml文件：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> 
<servlet>
<servlet-name>ServletDemo2</servlet-name>
<servlet-class>ServletDemo2</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ServletDemo2</servlet-name>
<url-pattern>/servlet/ServletDemo2</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>

<filter>
<filter-name>SetCharacterEncodingFilter</filter-name>
<filter-class>com.itheima.encoding.SetCharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping><!-- 按照此标签的出现顺序 -->
<filter-name>SetCharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

</web-app>

3。ServletDemo2.java文件：

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ServletDemo2 extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String name = request.getParameter("name");
response.getWriter().write(name+"<br/>");

response.getWriter().write("你好啊，你吃了吗");
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}

}

4。1.jsp文件：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>title</title>

<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->

</head>

<body>
<form action="${pageContext.request.contextPath}/servlet/ServletDemo2" method="post">
<input type="text" name="name"/><input type="submit" value="保存"/>
</form>
</body>
</html>

运行结果：

张珊珊
你好啊，你吃了吗

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