JSP乱码解决 使用过滤器Filter

1、SetCharacterEncoding.java

package com.servlet;

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;

public class SetCharacterEncoding implements Filter{
protected FilterConfig filterConfig = null;
protected String encoding = null;
public void init(FilterConfig filterConfig)throws ServletException{
   this.filterConfig = filterConfig ;
   this.encoding = filterConfig.getInitParameter("encoding");
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException , ServletException {
   String encoding=this.encoding;
   if(encoding != null){
    request.setCharacterEncoding(encoding);
    response.setCharacterEncoding(encoding);
   }
   chain.doFilter(request, response);
}

public void destroy() {
   this.encoding = null;
   this.filterConfig = null;
}
}

2、web.xml

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