java struts 中文乱码处理

摘自: http://hi.baidu.com/rascal_hu/blog/item/e6dd2a342647b84a241f1470.html
1.写一个过滤器，完整代码如下：
package com.jesun.character.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;

/**

* @author Jesun

* @date 2008-2-16

* 源码来自Internet,我只作了简单的修改

* 解决Struts中文显示乱码问题

* */

public class SetCharacterEncodingFilter implements Filter {

protected String encoding = null;

protected FilterConfig filterConfig = null;

protected boolean ignore = true; //在web.xml文件里定义filter时要用到此参数

public void destroy() {

// TODO Auto-generated method stub

this.encoding = null;

this.filterConfig = null;

}

public void doFilter(ServletRequest request, ServletResponse response,

FilterChain chain) throws IOException, ServletException {

// TODO Auto-generated method stub

// Conditionally select and set the character encoding to be used

if (ignore || (request.getCharacterEncoding() == null)) {

String encoding = selectEncoding(request);

if (encoding != null)

request.setCharacterEncoding(encoding);

}

//Pass control on to the next filter

chain.doFilter(request, response);

}

public void init(FilterConfig filterConfig) throws ServletException {

// TODO Auto-generated method stub

this.filterConfig = filterConfig;

this.encoding = filterConfig.getInitParameter("encoding");

String value = filterConfig.getInitParameter("ignore");

if (value == null)

this.ignore = true;

else if (value.equalsIgnoreCase("true"))

this.ignore = true;

else if (value.equalsIgnoreCase("yes"))

this.ignore = true;

else

this.ignore = false;

}

protected String selectEncoding(ServletRequest request) {

return (this.encoding);

}

}

//class end

(注：假如我们是用tomcat作服务器的话，那就更方便了，我们可以直接在tomcat的webapps\jsp-examples\Web-INF\classes\filters目录中的两个源文件RequestDumperFilter.java，SetCharacterEncodingFilter.java复制到你使用的包下。)

2.写好这个类以后，我们就在WEB应用的web.xml文件里定义Filter类，完整web.xml文件如下：

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app>

<!-- 定义Filter，解决struts中文问题 -->

<filter>

<filter-name>Set Character Encoding</filter-name>

<filter-class>com.jesun.character.Filter.SetCharacterEncodingFilter</filter-class>//包名

<init-param>

<!-- 定义编码格式，我用的是GBK -->

<param-name>encoding</param-name>

<param-value>GBK</param-value>

</init-param>

<init-param>

<!-- innore参数是在过滤器类定义的 -->

<param-name>ignore</param-name>

<param-value>true</param-value>

</init-param>

</filter>

<filter-mapping>

<filter-name>Set Character Encoding</filter-name>

<servlet-name>action</servlet-name>

</filter-mapping>

<filter-mapping>

<filter-name>Set Character Encoding</filter-name>

<servlet-name>*.jsp</servlet-name>

</filter-mapping>

<!-- Filter 定义结束 -->

<servlet>

<servlet-name>action</servlet-name>

<servlet-class>org.apache.struts.action.ActionServlet</servlet-class>

<init-param>

<param-name>config</param-name>

<param-value>/WEB-INF/struts-config.xml</param-value>

</init-param>

<init-param>

<param-name>debug</param-name>

<param-value>3</param-value>

</init-param>

<init-param>

<param-name>detail</param-name>

<param-value>3</param-value>

</init-param>

<load-on-startup>0</load-on-startup>

</servlet>

<servlet-mapping>

<servlet-name>action</servlet-name>

<url-pattern>*.do</url-pattern>

</servlet-mapping>

<welcome-file-list>

<welcome-file>index.jsp</welcome-file>

</welcome-file-list>

<taglib>

<taglib-uri>/WEB-INF/jesun.tld</taglib-uri>

<taglib-location>/WEB-INF/jesun.tld</taglib-location>

</taglib>

</web-app>

(3)以后编写JSP文件时，记得加入下面两句：

<%@page contentType="text/html;charset=GBK"%>

<META http-equiv=Content-Type content="text/html;charset=GBK">

到这里我们的工作就做完了，在程序里我们不需要再作任何其它处理，