1.寫一個過濾器：
package com.cissst.utils;
import java.io.IOException;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
/**
 * 
 *
 */
public class EncodingFilter implements Filter{
	private String targetEncoding ;
	protected FilterConfig filterConfig=null;
	/**由Web容器呼叫，初始化此Filter*/
	public void init(FilterConfig config) throws ServletException {
		this.filterConfig=config;
		this.targetEncoding=config.getInitParameter("encoding");
	}
	/**過濾處理方法*/
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain 

chain) throws IOException, 
	ServletException {
		/**對請求進行編碼設定*/
		HttpServletRequest srequest = (HttpServletRequest)request;
		srequest.setCharacterEncoding(targetEncoding);
		/**將處理權轉交給下一個處理器*/
		chain.doFilter(request, response);
	}
	/**由Web容器呼叫，銷燬此Filter*/
	public void destroy() {
		this.targetEncoding=null;
		this.filterConfig=null;
	}
	public void setFilterConfig(final FilterConfig filterConfig){
		this.filterConfig=filterConfig;
	}

}

2.在web.xml進行如下配置：

<!--  中文編碼過濾器配置:主要是用來解決中文亂碼問題 -->
	<filter>
		<filter-name>encodingFilter</filter-name>
		<filter-class>com.cissst.utils.EncodingFilter</filter-class>
		<init-param>
			<param-name>encoding</param-name>
			<param-value>GBK</param-value>
		</init-param>
		<init-param>
			<param-name>ignore</param-name>
			<param-value>true</param-value>
		</init-param>
	</filter>
	<filter-mapping>
		<filter-name>encodingFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>