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"

<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;

else

this.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>