过滤起示例--中文乱码

 

Servlet：

package cn.hbsi.web.filter;

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 CharSetEncodingFilter implements Filter {
 private FilterConfig filterConfig;
 
 public void destroy() {
  // TODO Auto-generated method stub
 }
 private String defaultCharset="utf-8";

 public void doFilter(ServletRequest request, ServletResponse response,
   FilterChain chain) throws IOException, ServletException {
  //解决乱码
  //恢复子类的原有属性
  HttpServletRequest req=(HttpServletRequest)request;
  HttpServletResponse rep=(HttpServletResponse)response;
  //初始化参数
  String charset=filterConfig.getInitParameter("encode");
  if(charset==null){
   charset=defaultCharset;
  }
  request.setCharacterEncoding(charset);
  rep.setCharacterEncoding(charset);
  rep.setContentType("text/html;charset="+charset);
  chain.doFilter(req, rep);
 }

 public void init(FilterConfig filterConfig) throws ServletException {
  // TODO Auto-generated method stub
  this.filterConfig=filterConfig;

 }

}

描述文件：

<filter>
    <filter-name>CharSetEncodingFilter</filter-name>
  <filter-class>cn.hbsi.web.filter.CharSetEncodingFilter</filter-class>
  <init-param>
   <param-name>encode</param-name>
   <param-value>utf-8</param-value>
 </init-param>
  </filter>
 
<filter-mapping>
  <filter-name>CharSetEncodingFilter</filter-name>
  <url-pattern>/*</url-pattern>
</filter-mapping>