防止出现乱码，J2EE项目一致使用UTF-8编码设置方法

http://www.myexception.cn/j2ee/859325.html

防止出现乱码，J2EE项目统一使用UTF-8编码设置方法
1.数据库建立为UTF-8格式
2.项目右键属性为UTF-8格式
3.所有页面申明为UTF-8
4.JDBC URL设为：UTF-8
jdbc:mysql://localhost:3306/company?useUnicode=true&characterEncoding=utf-8
5.数据库Driver选择UTF-8格式
6.Tomcat编码改成UTF-8
在server.xml里面增加URIEncoding="UTF-8"

[xml] view plain copy

1. <span style="font-size:12px;"><Connector port="8080" maxHttpHeaderSize="8192" maxThreads="150" minSpareThreads="25" maxSpareThreads="75" enableLookups="false" redirectPort="8443" acceptCount="100" connectionTimeout="20000" disableUploadTimeout="true" URIEncoding="UTF-8" />  
2. </span>  

7.加编码过滤器SetCharacterEncodingFilter.java 
注意：根据所在包名确定具体使用哪个包

[java] view plain copy

1. <span style="font-size:12px;">import <a target=_blank target="_blank" href="http://www.myexception.cn/j2me/java.io.IOException.html">java.io.IOException</a>;  
2.   
3. import javax.servlet.Filter;  
4.   
5. import javax.servlet.FilterChain;  
6.   
7. import javax.servlet.FilterConfig;  
8.   
9. import <a target=_blank target="_blank" href="http://www.myexception.cn/java-web/javax.servlet.ServletException.html">javax.servlet.ServletException</a>;  
10.   
11. import javax.servlet.ServletRequest;  
12.   
13. import javax.servlet.ServletResponse;  
14.   
15. public class SetCharacterEncodingFilter implements Filter {  
16.   
17.     protected String encoding = null;  
18.   
19.     protected FilterConfig filterConfig = null;  
20.   
21.     protected boolean ignore = true;  
22.   
23.     public void init(FilterConfig filterConfig) throws <a target=_blank target="_blank" href="http://www.myexception.cn/j2se/ServletException.html">ServletException</a> {  
24.   
25.         this.filterConfig = filterConfig;  
26.   
27.         this.encoding = filterConfig.getInitParameter("encoding");  
28.   
29.         String value = filterConfig.getInitParameter("ignore");  
30.   
31.         if (value == null)  
32.   
33.             this.ignore = true;  
34.   
35.         else if (value.equalsIgnoreCase("true"))  
36.   
37.             this.ignore = true;  
38.   
39.         else if (value.equalsIgnoreCase("yes"))  
40.   
41.             this.ignore = true;  
42.   
43.         else  
44.   
45.             this.ignore = false;  
46.   
47.     }  
48.   
49.     public void doFilter(ServletRequest request, ServletResponse response,  
50.             FilterChain chain) throws <a target=_blank target="_blank" href="http://www.myexception.cn/j2se/IOException.html">IOException</a>, ServletException {  
51.   
52.         // TODO 自动生成方法存根  
53.   
54.         if (ignore || (request.getCharacterEncoding() == null)) {  
55.   
56.             String encoding = selectEncoding(request);  
57.   
58.             if (encoding != null)  
59.   
60.                 request.setCharacterEncoding(encoding);  
61.   
62.         }  
63.   
64.         chain.doFilter(request, response);  
65.   
66.     }  
67.   
68.     public void destroy() {  
69.   
70.         // TODO 自动生成方法存根  
71.   
72.         this.encoding = null;  
73.   
74.         this.filterConfig = null;  
75.   
76.     }  
77.   
78.     protected String selectEncoding(ServletRequest request) {  
79.   
80.         return (this.encoding);  
81.   
82.     }  
83.   
84. }  
85. </span>  

在web.xml里面映射配置

[xml] view plain copy

1. <span style="font-size:12px;">  <filter>  
2.     <filter-name>Set Character Encoding</filter-name>  
3.     <filter-class>com.yourcompany.util.SetCharacterEncodingFilter</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>Set Character Encoding</filter-name>  
11.     <url-pattern>/*</url-pattern>  
12.   </filter-mapping>  
13. </span>