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1.web.xml配置如下（必须放在Struts2配置之前）
<!-- 字符编码过滤器配置-->
<filter>
<filter-name>CharEncodingFilter</filter-name>
<filter-class>com.crm.tools.CharEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>CharEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- Struts2过滤器配置-->
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!-- 其它配置-->
2.Filter类
package com.crm.tools;
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;
/**
* 字符过滤器
*/
@WebFilter("/CharEncodingFilter")
public class CharEncodingFilter implements Filter {
//设置为UTF-8
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
chain.doFilter(request, response);
}
//初始化
public void init(FilterConfig filterConfig) throws ServletException {
}
//销毁
public void destroy() {
}
}
3.表单请求（注意：必须制定method为post）
<form action="此处是请求的地址" method="post">
</form>
Notes：
字符编码过滤器必须放在其它过滤器之前，还有请求的表单必须为post，反正我试过，不指定method属性进行提交的话，会出现乱码
SSH项目中，解决中文请求参数乱码，Filter过滤器不起作用的问题
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原文地址：http://www.cnblogs.com/vincentExclusiveBlog/p/5351610.html
