解决Struts里提交中文表单到ActionForm后的乱码问题

由于Struts框架直接把表单数据发送给了ActionForm，所以这里面没有对HttpRequestServlet进行 SetCharacterEncoding,所以默认是按照ISO-8859-1(参见Tomcat 源代码中的org.apache.catalina.connector.HttpRequestBase中的protected void parseParameters()方法)，

解决的方法，就是在表单提交到ActionForm之前对request进行编码。
第一种方法，就是写一个过滤器，对所有请求进行过滤

 

过滤器代码：

package com.j2ee.onlineAuction.struts.filters;
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;

public class SetCharacterEncodingFilter implements Filter{
   
     @SuppressWarnings("unused")
     private String encoding;
     private FilterConfig filterConfig = null;
     
     public void destroy() {
      this.encoding = null;
      this.filterConfig = null;

     }

     public void doFilter(ServletRequest request, ServletResponse response,
       FilterChain chain) throws IOException, ServletException {
         if(encoding!=null)
         request.setCharacterEncoding(this.encoding);
         chain.doFilter(request, response);
     }

     public void init(FilterConfig filterConfig) throws ServletException {
         this.filterConfig=filterConfig;
         this.encoding = filterConfig.getInitParameter("encoding");
     }
}

配置文件web.xml：

  <filter>
  <filter-name>Set Character Encoding</filter-name>
  <filter-class>com.j2ee.onlineAuction.struts.filters.SetCharacterEncodingFilter</filter-class>
    <init-param>
     <param-name>encoding</param-name>
     <param-value>UTF-8</param-value>
    </init-param>
  </filter>

  <filter-mapping>
    <filter-name>Set Character Encoding</filter-name>
    <url-pattern>*.do</url-pattern>
  </filter-mapping>

 

第二种方法是替换默认的控制器org.apache.struts.action.ActionServlet

子类代码：
package jp.co.ricoh.gtis.others.profile.controllers;

import java.io.IOException;

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

import org.apache.struts.action.ActionServlet;

public class SetEncodingActionServlet extends ActionServlet {

 protected void process(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
  // TODO Auto-generated method stub
  String encoding = getInitParameter("encoding");
  request.setCharacterEncoding(encoding);
  super.process(request, response);
 }

}

配置文件web.xml
  <servlet>
    <servlet-name>testAction</servlet-name>
    <servlet-class>jp.co.ricoh.gtis.others.profile.controllers.SetEncodingActionServlet</servlet-class>
    <init-param>
      <param-name>config</param-name>
      <param-value>/WEB-INF/struts-config.xml</param-value>
    </init-param>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>Shift_JIS</param-value>
    </init-param>
    <load-on-startup>2</load-on-startup>
  </servlet>

  <servlet-mapping>
    <servlet-name>testAction</servlet-name>
    <url-pattern>*.testdo</url-pattern>
  </servlet-mapping>

此例，凡是通过*.testdo来请求的数据，都会经过参数encoding设定的值来编码。