UTF-8过滤器

package sktbbs.common.base;

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;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class EncodingFilter implements Filter 
{

	protected FilterConfig filterConfig;
	private String targetEncoding = "UTF-8";

	/**
	 * 初始化过滤器
	 */
	public void init(FilterConfig config) throws ServletException 
	{
		this.filterConfig = config;
		this.targetEncoding = config.getInitParameter( "encoding" );		
	}
	/**
	 * 进行过滤处理，这个方法最重要，所有过滤处理的代码都在此实现
	 */
	public void doFilter(ServletRequest srequest, ServletResponse sresponse,
			FilterChain chain) throws IOException, ServletException 
	{
		HttpServletRequest request = (HttpServletRequest)srequest;
		HttpServletResponse response = (HttpServletResponse)sresponse;
		request.setCharacterEncoding( targetEncoding );		
		response.setContentType("text/html;charset="+targetEncoding);
		
		//把处理权发送到下一个
		chain.doFilter( srequest , sresponse );		
	}
	/**
	 * 销毁过滤器
	 */
	public void destroy() 
	{
		this.filterConfig = null;
	}
}

 

 

web.xml

 

   <filter>
  	<filter-name>encoding</filter-name>
  	<filter-class>com.cc.common.base.EncodingFilter</filter-class>
  	<init-param>
  		<param-name>encoding</param-name>
  		<param-value>UTF-8</param-value>
  	</init-param>
  </filter>
  
  <filter-mapping>
  	<filter-name>encoding</filter-name>
  	<url-pattern>/*</url-pattern>
  </filter-mapping>