关于Struts里提交中文表单到ActionForm后的乱码问题。

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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 jp.co.ricoh.gtis.others.profile.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 {
private String encoding;
public void init(FilterConfig filterConfig) throws ServletException {
// TODO Auto-generated method stub
this.encoding=filterConfig.getInitParameter("encoding");
}

public void doFilter(ServletRequest request, ServletResponse response,
   FilterChain chain) throws IOException, ServletException {
  // TODO Auto-generated method stub
  request.setCharacterEncoding(this.encoding);
  chain.doFilter(request,response);
}

public void destroy() {
// TODO Auto-generated method stub

}

配置文件web.xml
<filter>
   <filter-name>SetCharacterEncodingFilter</filter-name>
   <filter-class>jp.co.ricoh.gtis.others.profile.filters.SetCharacterEncodingFilter</filter-class>
   <init-param>
    <param-name>encoding</param-name>
    <param-value>Shift_JIS</param-value>
   </init-param>
</filter>

   <filter-mapping>
   <filter-name>SetCharacterEncodingFilter</filter-name>
   <url-pattern>/*</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。