java中文乱码过滤器

今天做项目又遇到了乱码问题，懒得再写或上网copy了，干脆记在这里，随时用随时取，同时也能方便大家工作或学习！有好的想法要多多交流啊！

1. 在你的工程中EncodingFilter类,然后把下边代码粘贴进去。

import java.io.IOException;
import java.io.PrintWriter;

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.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.*;

public class EncodingFilter extends HttpServlet implements Filter {

private FilterConfig filterConfig;
private String trargetEncoding=null;

public void init(FilterConfig filterConfig)throws ServletException{
   this.filterConfig=filterConfig;
   this.trargetEncoding=this.filterConfig.getInitParameter("encoding");
}

public void doFilter(ServletRequest request, ServletResponse response,   FilterChain filterChain) {
   // TODO Auto-generated method stub
   try{
    //在控制台输出目标编码
    System.out.println("trargetEncoding:"+trargetEncoding+"\n");
    //执行编码，实际的处理内容
    request.setCharacterEncoding(trargetEncoding);
    filterChain.doFilter(request,response);
   }  catch (ServletException sx) {
    filterConfig.getServletContext().log(sx.getMessage());
   }
   catch (IOException iox){
    filterConfig.getServletContext().log(iox.getMessage());
   }

}

public void destroy() {
   //清空资源
   this.filterConfig=null;
   this.trargetEncoding=null;
}

}

2.在web.xml中插入下面的代码，

<filter>
<filter-name>encodingfilter</filter-name>
<filter-class>xxxx.EncodingFilter</filter-class>//xxxx为你的Java程序的包名，EncodingFilter是你的java的类名。
<init-param>
<description>encode to UTF-8</description>//UTF-8表示中文编码
<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>

ok中文乱码问题全部解决。整了一下，分享给大家。