Encoding filter 編碼過濾器

標籤：

1、首先編寫過濾器，實際上就是繼承了filter介面的一個類，實現其中的init  doChain  和destroy方法

package com.util;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 EncoderFilter implements Filter {    @Override    public void destroy() {        // TODO Auto-generated method stub        System.out.println("i defined filter destroy~~~~~~~~~~~~~~~~~~~~~~");    }    @Override    public void doFilter(ServletRequest arg0, ServletResponse arg1,            FilterChain arg2) throws IOException, ServletException {        // TODO Auto-generated method stub        arg0.setCharacterEncoding("UTF-8");        System.out.println("the request encoding is " + arg0.getCharacterEncoding());        System.out.println("enter myself filter~~~~~~~~~~~~~~~~~~~~~~" + new String(arg0.getParameter("men.name").getBytes(), "GBK"));        arg2.doFilter(arg0, arg1);    }    @Override    public void init(FilterConfig arg0) throws ServletException {        // TODO Auto-generated method stub        System.out.println("i defined filter init~~~~~~~~~~~~~~~~~~~~~~");    }    }

EncoderFilter.java

2、在web.xml檔案裡面，加入如下代碼

  <filter>          <filter-name>encodeFilter</filter-name>          <filter-class>com.util.EncoderFilter</filter-class>  </filter>  <filter-mapping>          <filter-name>encodeFilter</filter-name>          <url-pattern>/*</url-pattern>  </filter-mapping>

web.xml

切記，此代碼應該加在struts2的過濾器前面的位置。

這時候訪問傳漢字應該是沒有問題了，可是~~~還是亂碼，解決辦法：修改tomcat的server.xml檔案

將
<Connector port="8080" protocol="HTTP/1.1" 
               connectionTimeout="20000" 
               redirectPort="8443" />
裡添加上後面3個編碼的設定

<Connector port="8080" protocol="HTTP/1.1"
connectionTimeout="20000"
redirectPort="8443"
useBodyEncodingForURI="true"
IEncoding="utf-8"
URIEncoding="utf-8"
/>

這時候傳漢字就正常了！

 

關於編碼，可以使用request.getCharacterEncoding()方法來看請求時採用的是什麼編碼！

 

Encoding filter 編碼過濾器