Struts1 中提交中文表单到ActionForm后出现乱码问题的原因及处理方法

问题：

在你所有页面设置的编码都是utf-8的情况下仍然会出现中文乱码现象。

一、乱码出现原因

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。

二、解决办法

方法 ： 就是在表单提交到ActionForm之前对request进行编码,写一个过滤器，对所有请求进行过滤

方式一：直接在过滤器中指定编码格式

MyFilter.java

 public class MyFilter extends HttpServlet implements Filter {
     private static final long serialVersionUID = 1L;

     public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2) throws java.io.IOException, javax.servlet.ServletException {
          // TODO Auto-generated method stub
           arg0.setCharacterEncoding("utf-8"); //设置接收编码
         arg1.setContentType("text/html;charset=utf-8");
         arg2.doFilter(arg0, arg1);   //必须

     }

     public void init(FilterConfig arg0) throws javax.servlet.ServletException {
          // TODO Auto-generated method stub
     }

 }

在web.xml中添加

 <filter>
     <filter-name>MyFilter</filter-name>
     <filter-class>com.xidian.filter.MyFilter</filter-class>
   </filter>
   <filter-mapping>
     <filter-name>MyFilter</filter-name>
     <url-pattern>/*</url-pattern>
   </filter-mapping>

方式二：在web.xml中指定编码格式

MyFilter.java

 package com.xidian.filter;

 import javax.servlet.Filter;
 import javax.servlet.FilterChain;
 import javax.servlet.FilterConfig;
 import javax.servlet.ServletRequest;
 import javax.servlet.ServletResponse;
 import javax.servlet.annotation.WebServlet;
 import javax.servlet.http.HttpServlet;

 public class MyFilter extends HttpServlet implements Filter {
     private static final long serialVersionUID = 1L;
      private String encoding; 

     public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2) throws java.io.IOException, javax.servlet.ServletException {
          // TODO Auto-generated method stub
            arg0.setCharacterEncoding(encoding);
            arg2.doFilter(arg0, arg1);
     }

     public void init(FilterConfig arg0) throws javax.servlet.ServletException {
          // TODO Auto-generated method stub
          encoding=arg0.getInitParameter("encoding");
     }

 }

在web.xml添加

  <filter>
     <filter-name>MyFilter</filter-name>
     <filter-class>com.xidian.filter.MyFilter</filter-class>
     <init-param>
     <param-name>encoding</param-name>
     <param-value>utf-8</param-value>
     </init-param>
   </filter>
   <filter-mapping>
     <filter-name>MyFilter</filter-name>
     <url-pattern>/*</url-pattern>
   </filter-mapping>

下面是struts2中中文乱码的问题：

关于struts2中表单提交时，中文乱码问题的解决

顺带再说下加上对输入数据内容的过滤的情况：

再添加一个过滤程序：

SafeFilter.java

 package com.xidian.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;

 public class SafeFilter implements Filter {
     private String keywords[];

     public void doFilter(ServletRequest request, ServletResponse response,
             FilterChain chain) throws IOException, ServletException {
         //这里我们接收到用户名
         String name=request.getParameter("name");
         request.setAttribute("err", "您不允许登录<font color='red'>"+name+"</font>");
         System.out.println("第二个过滤器："+name);
         if(name!=null){
             //判断
             for(String key:keywords){
                 if(key.equals(name)){
                     request.getRequestDispatcher("WEB-INF/ifo.jsp").forward(request, response);
                     return;
                 }
             }

         }
         chain.doFilter(request, response);
     }

     public void init(FilterConfig filterConfig) throws ServletException {
         keywords=filterConfig.getInitParameter("keywords").split(";");

     }

 }

web.xml的配置

 <!-- 部署过滤器的顺序就是执行的顺序 -->
    <filter>
     <filter-name>MyFilter</filter-name>
     <filter-class>com.xidian.filter.MyFilter</filter-class>
     <init-param>
     <param-name>encoding</param-name>
     <param-value>utf-8</param-value>
     </init-param>
   </filter>

    <filter>
     <filter-name>SafeFilter</filter-name>
     <filter-class>com.xidian.filter.SafeFilter</filter-class>
     <init-param>
     <param-name>keywords</param-name>
     <param-value>拉登;小明;凤姐</param-value>
     </init-param>
   </filter>