防止出现乱码，J2EE项目统一使用UTF8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代码

1. <Connector port="8080" maxHttpHeaderSize="8192" maxThreads="150" minSpareThreads="25" maxSpareThreads="75" enableLookups="false" redirectPort="8443" acceptCount="100" connectionTimeout="20000" disableUploadTimeout="true" URIEncoding="UTF-8" />  

<Connector port="8080" maxHttpHeaderSize="8192" maxThreads="150" minSpareThreads="25" maxSpareThreads="75" enableLookups="false" redirectPort="8443" acceptCount="100" connectionTimeout="20000" disableUploadTimeout="true" URIEncoding="UTF-8" />
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代码

1. import java.io.IOException;  
2.   
3. import javax.servlet.Filter;  
4.   
5. import javax.servlet.FilterChain;  
6.   
7. import javax.servlet.FilterConfig;  
8.   
9. import javax.servlet.ServletException;  
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 ServletException {  
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 IOException, 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. }  

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 SetCharacterEncodingFilter implements Filter { protected String encoding = null; protected FilterConfig filterConfig = null; protected boolean ignore = true; public void init(FilterConfig filterConfig) throws ServletException { this.filterConfig = filterConfig; this.encoding = filterConfig.getInitParameter("encoding"); String value = filterConfig.getInitParameter("ignore"); if (value == null) this.ignore = true; else if (value.equalsIgnoreCase("true")) this.ignore = true; else if (value.equalsIgnoreCase("yes")) this.ignore = true; else this.ignore = false; } public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { // TODO 自动生成方法存根 if (ignore || (request.getCharacterEncoding() == null)) { String encoding = selectEncoding(request); if (encoding != null) request.setCharacterEncoding(encoding); } chain.doFilter(request, response); } public void destroy() { // TODO 自动生成方法存根 this.encoding = null; this.filterConfig = null; } protected String selectEncoding(ServletRequest request) { return (this.encoding); } }

在web.xml里面映射配置
Xml代码

1. <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>