过滤器解决form表单中中文乱码问题

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form表单中post请求的乱码问题很容易解决，只需设置request请求的响应头就OK了，但是get请求就不是那么容易解决的，下面就是在不改变服务器配置文件的前提下，利用过滤器将浏览器所有的请求的乱码问题解决。

在测试页面中：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

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

<title>测试页面</title>
</head>

<body>
<%--System.out.println("Filter is working");--%>

<form action="./TestCharacterEncoding.do" method="get">
<input type="text" name="city"/>
<input type="submit" value="提交"/>
</form>

</body>
</html>

过滤器的配置文件web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
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_2_5.xsd">
<display-name></display-name>

<filter>
<filter-name>CharacterEncodingFilter</filter-name>
<filter-class>cn.csdn.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>charset</param-name>
<param-value>utf-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>TestCharacterEncoding</servlet-name>
<servlet-class>cn.csdn.web.servlet.TestCharacterEncoding</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>TestCharacterEncoding</servlet-name>
<url-pattern>/TestCharacterEncoding.do</url-pattern>
</servlet-mapping>

<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>

下面就是过滤器的代码部分了

package cn.csdn.web.filter;

import java.io.IOException;
import java.io.UnsupportedEncodingException;

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.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpServletResponse;

import com.sun.net.httpserver.HttpsConfigurator;

public class CharacterEncodingFilter implements Filter {

private String defaultEncoding = "utf-8";
private FilterConfig config = null;

class sword extends HttpServletRequestWrapper{

public sword(HttpServletRequest request) {
super(request);
}

@Override
public String getParameter(String name) {
name = super.getParameter(name);
try {
return new String(name.getBytes("iso8859-1"),"utf-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return null;
}
}

public void init(FilterConfig filterConfig) throws ServletException {
config = filterConfig;
}

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

if(req.getMethod().equals("post")){
req.setCharacterEncoding("utf-8");
}else{
request = new sword(req);
}

String charset = config.getInitParameter("charset");
if(charset==null){
charset=defaultEncoding;
}
response.setCharacterEncoding(charset);
response.setContentType("text/html;charset="+charset);

chain.doFilter(request, response);
}

public void destroy() {

}

}