防止出现乱码，J2EE项目一致使用UTF-8编码设置方法

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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"

<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" /></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

<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>;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import <a target=_blank target="_blank" href="http://www.myexception.cn/java-web/javax.servlet.ServletException.html">javax.servlet.ServletException</a>;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 <a target=_blank target="_blank" href="http://www.myexception.cn/j2se/ServletException.html">ServletException</a> {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 <a target=_blank target="_blank" href="http://www.myexception.cn/j2se/IOException.html">IOException</a>, 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);}}</span>

在web.xml里面映射配置

<span style="font-size:12px;">  <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></span>

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