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一个character encoding filter
 1 package cn.com.jsp;
  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 import javax.servlet.UnavailableException;
 11
12 public   class  SetCharacterEncodingFilter implements Filter  {
 13      protected  String encoding  =   null ;
 14      protected  FilterConfig filterConfig  =   null ;
 15      protected  boolean ignore  =   true ;
 16
17      public   void  destroy()  {
 18          this .encoding  =   null ;
 19          this .filterConfig  =   null ;
 20     }
21
22      public   void  doFilter(ServletRequest request, ServletResponse response,
 23                          FilterChain chain) throws IOException,
 24             ServletException  {
 25
26          //  Conditionally select and set the character encoding to be used
27          if  (ignore  ||  (request.getCharacterEncoding()  ==   null ))  {
 28             String encoding  =  selectEncoding(request);
 29              if  (encoding  !=   null )  {
 30                 request.setCharacterEncoding(encoding);
 31             }
32         }
33
34          //  Pass control on to the next filter
35         chain.doFilter(request, response);
 36
37     }
38
39      public   void  init(FilterConfig filterConfig) throws ServletException  {
 40
41          this .filterConfig  =  filterConfig;
 42          this .encoding  =  filterConfig.getInitParameter( " encoding " );
 43         String value  =  filterConfig.getInitParameter( " ignore " );
 44          if  (value  ==   null )  {
 45              this .ignore  =   true ;
 46         }   else   if  (value.equalsIgnoreCase( " true " ))  {
 47              this .ignore  =   true ;
 48         }   else   if  (value.equalsIgnoreCase( " yes " ))  {
 49              this .ignore  =   true ;
 50         }   else   {
 51              this .ignore  =   false ;
 52         }
53
54     }
55
56      protected  String selectEncoding(ServletRequest request)  {
 57          return  ( this .encoding);
 58     }
59
60 }


相应的web.xml文件里的配置如下：

 1<web-app>
 2  <display-name>wwwrootSPAN style="COLOR: #800000">display-name>
 3  <description>MySQL Test AppSPAN style="COLOR: #800000">description>
 4  <filter>
 5    <filter-name>setCharacterEncodingFilterSPAN style="COLOR: #800000">filter-name>
 6    <display-name>setCharacterEncodingFilterSPAN style="COLOR: #800000">display-name>
 7    <description>setCharacterEncodingFilterSPAN style="COLOR: #800000">description>
 8    <filter-class>cn.com.jsp.SetCharacterEncodingFilterSPAN style="COLOR: #800000">filter-class>
 9    <init-param>
10      <param-name>encodingSPAN style="COLOR: #800000">param-name>
11      <param-value>GBKSPAN style="COLOR: #800000">param-value>
12    SPAN style="COLOR: #800000">init-param>
13  SPAN style="COLOR: #800000">filter>
14  <filter-mapping>
15    <filter-name>setCharacterEncodingFilterSPAN style="COLOR: #800000">filter-name>
16    <url-pattern>/*SPAN style="COLOR: #800000">url-pattern>
17  SPAN style="COLOR: #800000">filter-mapping>
18……
19SPAN style="COLOR: #800000">web-app>

上面的代码我也没更改什么，看了后，了解了其中的些许流程。放入blog，留以备学吧
posted on 2006-07-27 15:11 brock 阅读(368) 评论(0)  编辑  收藏

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