乱码

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;elsethis.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>  

  <filter>    <filter-name>Set Character Encoding</filter-name>    <filter-class>com.yourcompany.util.SetCharacterEncodingFilter</filter-class>    <init-param>      <param-name>encoding</param-name>      <param-value>UTF-8</param-value>    </init-param>  </filter>  <filter-mapping>    <filter-name>Set Character Encoding</filter-name>    <url-pattern>/*</url-pattern>  </filter-mapping>