Struts裏提交中文表單到ActionForm的亂碼問題

 由於Struts框架直接把表單數據發送給了ActionForm，所以這裏面沒有對HttpRequestServlet進行SetCharacterEncoding,所以默認是按照ISO-8859-1(參見Tomcat 源代碼中的org.apache.catalina.connector.HttpRequestBase中的protected void parseParameters()方法)，

    解決的方法，就是在表單提交到ActionForm之前對request進行編碼。
    第一種方法，就是寫一個過濾器，對所有請求進行過濾

    過濾器代碼：

     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>utf-8</param-value>
       </init-param>
      </filter>

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

    第二種方法是替換默認的控制器org.apache.struts.action.ActionServlet

    子類代碼：

     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>utf-8</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，凡是通過*.testdo來請求的數據，都會經過參數encoding設定的值來編碼。