< filter >
     < filter-name > Set Character Encoding </ filter-name >
     < filter-class > org.springframework.web.filter.CharacterEncodingFilter </ filter-class >
     < init-param >
       < param-name > encoding </ param-name >
       < param-value > GBK </ param-value >
     </ init-param >
     < init-param >
       < param-name > ignore </ param-name >
       < param-value > true </ param-value >
     </ init-param >
   </ filter >
   < filter-mapping >
     < filter-name > Set Character Encoding </ filter-name >
     < url-pattern > *.do </ url-pattern >
   </ filter-mapping >
   < filter-mapping >
     < filter-name > Set Character Encoding </ filter-name >
     < url-pattern > *.jsp </ url-pattern >
   </ filter-mapping >
   < filter-mapping >
     < filter-name > Set Character Encoding </ filter-name >
     < url-pattern > *.html </ url-pattern >
   </ filter-mapping >
   < filter-mapping >
     < filter-name > Set Character Encoding </ filter-name >
     < url-pattern > *.htm </ url-pattern >
   </ filter-mapping >

的，有用

 <% request.setCharacterEncoding( " GBK " ); %>
的，还有用

 <% @ page contentType = " text/html; charset=GBK "  pageEncoding = " GBK " %>

<meta http-equiv="content-type" content="text/html; charset=GBK">

的,还可以用

 <%  String name  =   new  String(request.getParameter( " name " ).getBytes( " 8859_1 " ),  " GB2312 " );  %>

昨天就在做项目的过程中，发现用URL传request参数的时候，在第二个页面上得到乱码的问题。把上面几种方法都试了一下还是不行。仔细追踪了一下，发现在页面的源代码上中文是正常的，一直到URL还是中文正常，可是在后台的Action里面log出来就成了乱码了，于是猜想是在request封装的过程中把中文变成乱码了，以致于后台直接就是取到的乱码。在后台Action中Set入中文，页面上正常显示，说明Struts的中文已经不存在问题。剩下的，应该就只有doGet和doPost方法的问题了。找了一下tomcat的配置文件，发现只要在server.xml中：

      <!--  Define a non-SSL HTTP/1.1 Connector on port 8080  -->
     < Connector  port ="8080"  maxHttpHeaderSize ="8192"
               maxThreads ="150"  minSpareThreads ="25"  maxSpareThreads ="75"
               enableLookups ="false"  redirectPort ="8443"  acceptCount ="100"
               connectionTimeout ="20000"  disableUploadTimeout ="true" />
     <!--  Note : To disable connection timeouts, set connectionTimeout value
     to 0  -->
改为

      <!--  Define a non-SSL HTTP/1.1 Connector on port 8080  -->
     < Connector  port ="8080"  maxHttpHeaderSize ="8192"
               maxThreads ="150"  minSpareThreads ="25"  maxSpareThreads ="75"
               enableLookups ="false"  redirectPort ="8443"  acceptCount ="100"
               connectionTimeout ="20000"  disableUploadTimeout ="true"  URIEncoding ="GBK"/>
     <!--  Note : To disable connection timeouts, set connectionTimeout value
     to 0  -->
就是加上URIEncoding="GBK"就万事大吉了。

再加上一条：

<session-factory>
　　<property name="hibernate.connection.url">jdbc:jtds:sqlserver://192.168.0.3:1433;DatabaseName=HomeConsume;charset=GBK</property>
　　<property name="hibernate.cglib.use_reflection_optimizer">true</property>
　　<property name="hibernate.connection.password">sju</property>
　　<property name="hibernate.connection.username">sa</property>
　　<property name="hibernate.connection.driver_class">net.sourceforge.jtds.jdbc.Driver</property>
　　<property name="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</property>
　　<mapping resource="net/magicyang/homeconsume/pojo/Test.hbm.xml" />
　　<mapping resource="net/magicyang/homeconsume/pojo/Consumeinfo.hbm.xml" />
　　<mapping resource="net/magicyang/homeconsume/pojo/Consumetype.hbm.xml" />
　　</session-factory>
至此，应该再困难的乱码问题都解决了吧。就是要在页面上、数据库中、request里、doGet、doPost方法里面都是中文！看你还有什么地方躲？？

1   public  String getIpAddr(HttpServletRequest request)  {
2       String ip  =  request.getHeader( " x-forwarded-for " );
3        if (ip  ==   null   ||  ip.length()  ==   0 )  {
4             ip  =  request.getRemoteAddr();
5         }
6          return  ip;
7     }

 1 <% @ page import = " java.util.* "   %>
 2 < table  border =1  cellspacing =0  cellpadding =0  align =center >  
 3 < tr >  
 4 < th > Name </ th >  
 5 < th > Value </ th >  
 6 </ tr >  
 7 <%  
 8 Enumeration enumNames; 
 9 String  strName,strValue; 
10
11 enumNames  =  request.getHeaderNames(); 
12 while (enumNames.hasMoreElements()){ 
13     strName  =  ( String )enumNames.nextElement(); 
14     strValue  =  request.getHeader(strName); 
15      %>  
16      < tr >  
17      < td > <% = strName %> </ td >  
18      < td > <% = strValue %> </ td >  
19      </ tr >  
20      <%  
21 } 
22 %>
23 < tr >
24 </ table >
25

 1      public  String getIpAddr(HttpServletRequest request)  {
 2         String ip  =  request.getHeader( " x-forwarded-for " );
 3          if (ip  ==   null   ||  ip.length()  ==   0   ||   " unknown " .equalsIgnoreCase(ip))  {
 4             ip  =  request.getHeader( " Proxy-Client-IP " );
 5         }
 6          if (ip  ==   null   ||  ip.length()  ==   0   ||   " unknown " .equalsIgnoreCase(ip))  {
 7             ip  =  request.getHeader( " WL-Proxy-Client-IP " );
 8         }
 9          if (ip  ==   null   ||  ip.length()  ==   0   ||   " unknown " .equalsIgnoreCase(ip))  {
10             ip  =  request.getRemoteAddr();
11         }
12          return  ip;
13     }
14

　　可是，如果通过了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串Ｉｐ值，究竟哪个才是真正的用户端的真实IP呢？

　　答案是取X-Forwarded-For中第一个非unknown的有效IP字符串。

　　如：
　　X-Forwarded-For：192.168.1.110, 192.168.1.120, 192.168.1.130, 192.168.1.100
　　用户真实IP为： 192.168.1.110