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

 1 public class MyFilter extends HttpServlet implements Filter {
 2     private static final long serialVersionUID = 1L;
 3        
 4 
 5     public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2) throws java.io.IOException, javax.servlet.ServletException { 
 6          // TODO Auto-generated method stub
 7           arg0.setCharacterEncoding("utf-8"); //设置接收编码
 8         arg1.setContentType("text/html;charset=utf-8");
 9         arg2.doFilter(arg0, arg1);   //必须
10     
11     }
12 
13     
14     public void init(FilterConfig arg0) throws javax.servlet.ServletException { 
15          // TODO Auto-generated method stub
16     }
17 
18 }

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在web.xml中添加

1 <filter>
2     <filter-name>MyFilter</filter-name>
3     <filter-class>com.xidian.filter.MyFilter</filter-class>
4   </filter>
5   <filter-mapping>
6     <filter-name>MyFilter</filter-name>
7     <url-pattern>/*</url-pattern>
8   </filter-mapping>

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方式二：在web.xml中指定编码格式

MyFilter.java

 1 package com.xidian.filter;
 2 
 3 import javax.servlet.Filter;
 4 import javax.servlet.FilterChain;
 5 import javax.servlet.FilterConfig;
 6 import javax.servlet.ServletRequest;
 7 import javax.servlet.ServletResponse;
 8 import javax.servlet.annotation.WebServlet;
 9 import javax.servlet.http.HttpServlet;
10 
11 public class MyFilter extends HttpServlet implements Filter {
12     private static final long serialVersionUID = 1L;
13      private String encoding; 
14 
15     public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2) throws java.io.IOException, javax.servlet.ServletException { 
16          // TODO Auto-generated method stub
17            arg0.setCharacterEncoding(encoding);
18            arg2.doFilter(arg0, arg1);
19     }
20 
21     public void init(FilterConfig arg0) throws javax.servlet.ServletException { 
22          // TODO Auto-generated method stub
23          encoding=arg0.getInitParameter("encoding");
24     }
25 
26 }

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在web.xml添加

 1  <filter>
 2     <filter-name>MyFilter</filter-name>
 3     <filter-class>com.xidian.filter.MyFilter</filter-class>
 4     <init-param>
 5     <param-name>encoding</param-name>
 6     <param-value>utf-8</param-value>
 7     </init-param> 
 8   </filter>
 9   <filter-mapping>
10     <filter-name>MyFilter</filter-name>
11     <url-pattern>/*</url-pattern>
12   </filter-mapping>

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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

 1 package com.xidian.filter;
 2 
 3 import java.io.IOException;
 4 import javax.servlet.Filter;
 5 import javax.servlet.FilterChain;
 6 import javax.servlet.FilterConfig;
 7 import javax.servlet.ServletException;
 8 import javax.servlet.ServletRequest;
 9 import javax.servlet.ServletResponse;
10 
11 public class SafeFilter implements Filter {    
12     private String keywords[];
13 
14     public void doFilter(ServletRequest request, ServletResponse response,
15             FilterChain chain) throws IOException, ServletException {
16         //这里我们接收到用户名
17         String name=request.getParameter("name");
18         request.setAttribute("err", "您不允许登录<font color='red'>"+name+"</font>");
19         System.out.println("第二个过滤器："+name);
20         if(name!=null){
21             //判断
22             for(String key:keywords){
23                 if(key.equals(name)){
24                     request.getRequestDispatcher("WEB-INF/ifo.jsp").forward(request, response);
25                     return;
26                 }
27             }
28             
29         }
30         chain.doFilter(request, response);
31     }
32 
33 
34     public void init(FilterConfig filterConfig) throws ServletException {
35         keywords=filterConfig.getInitParameter("keywords").split(";");
36 
37     }
38 
39 }

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web.xml的配置

 1 <!-- 部署过滤器的顺序就是执行的顺序 -->
 2    <filter>
 3     <filter-name>MyFilter</filter-name>
 4     <filter-class>com.xidian.filter.MyFilter</filter-class>
 5     <init-param>
 6     <param-name>encoding</param-name>
 7     <param-value>utf-8</param-value>
 8     </init-param> 
 9   </filter>
10  
11    <filter>
12     <filter-name>SafeFilter</filter-name>
13     <filter-class>com.xidian.filter.SafeFilter</filter-class> 
14     <init-param>
15     <param-name>keywords</param-name>
16     <param-value>拉登;小明;凤姐</param-value>
17     </init-param>
18   </filter>

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