JSP网页即使写成

<%@ page contentType= “text/html; charset=UTF-8 ” language= “java ” import= “java.sql.* ” errorPage= “error.jsp ” %>

Mysql里存取的数据库的charset也设成了UTF-8，可是通过JSP网页存取中文还是显示乱码 。解决的办法就是加一个过滤器：

1. package cn.cate.utils;          
2.           
3. import java.io.IOException;          
4.           
5. import javax.servlet.Filter;          
6. import javax.servlet.FilterChain;          
7. import javax.servlet.FilterConfig;          
8. import javax.servlet.ServletException;          
9. import javax.servlet.ServletRequest;          
10. import javax.servlet.ServletResponse;          
11.           
12. public class SetCharacterEncodingFilter  implements Filter{          
13.           
14.     protected String encoding = null;           
15.     protected FilterConfig filterConfig = null;           
16.     protected boolean ignore = true;           
17.           
18.     @Override          
19.     public void destroy() {          
20.         this.encoding = null;           
21.         this.filterConfig = null;           
22.     }          
23.           
24.     @Override          
25.     public void doFilter(ServletRequest request, ServletResponse response,          
26.             FilterChain chain) throws IOException, ServletException {          
27.                   
28.         if (ignore || (request.getCharacterEncoding() == null)) {           
29.             String encoding = selectEncoding(request);           
30.             if (encoding != null) {           
31.                 request.setCharacterEncoding(encoding);          
32.             }           
33.         }           
34.         chain.doFilter(request, response);           
35.     }          
36.           
37.     @Override          
38.     public void init(FilterConfig filterConfig) throws ServletException {          
39.         this.filterConfig = filterConfig;           
40.         this.encoding = filterConfig.getInitParameter("encoding");           
41.         String value = filterConfig.getInitParameter("ignore");           
42.         if (value == null) {           
43.           this.ignore = true;           
44.         }           
45.         else if (value.equalsIgnoreCase("true")) {           
46.           this.ignore = true;           
47.         }           
48.         else if (value.equalsIgnoreCase("yes")) {           
49.           this.ignore = true;           
50.         }           
51.         else {           
52.           this.ignore = false;           
53.         }           
54.     }          
55.           
56.     protected String selectEncoding(ServletRequest request) {           
57.         return (this.encoding);           
58.     }           
59. }      

然后在web.xml作如下配置：

1. XML/HTML 代码复制内容到剪贴板  
2.       
3. <filter>           
4.   <filter-name>Set Character Encoding</filter-name>           
5.   <filter-class>cn.cate.utils.SetCharacterEncodingFilter</filter-class>           
6.   <init-param>           
7.     <param-name>encoding</param-name>           
8.     <param-value>UTF-8</param-value>           
9.   </init-param>           
10. </filter>           
11. <filter-mapping>           
12.   <filter-name>Set Character Encoding</filter-name>           
13.   <url-pattern>/*</url-pattern>           
14. </filter-mapping>       

     本文转自06peng 51CTO博客，原文链接：http://blog.51cto.com/06peng/962462，如需转载请自行联系原作者