在一个javaWeb项目中加入一个字符编码过滤器

步骤

准备过程：

(1)整改控制器的URL，加上.do后缀

(2)修改所有jsp中牵涉到控制器URL，加上.do后缀 

(3)测试一下

字符编码的过滤器

package com.njwbhz.mood.filter;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class CharacterEncodingFilter implements Filter {
   //采用配置
   private String encoding;
   @Override
   public void init ( FilterConfig filterConfig ) throws ServletException {
      //初始化的时候获取编码方式
      this.encoding = filterConfig.getInitParameter ( "encoding" );
   }
   @Override
   public void doFilter ( ServletRequest servletRequest , ServletResponse servletResponse , FilterChain filterChain ) throws IOException, ServletException {
      //过滤器的业务逻辑——>有时会说拦截器的业务逻辑
      HttpServletRequest request = ( HttpServletRequest ) servletRequest;
      HttpServletResponse response = ( HttpServletResponse ) servletResponse;
      //获取请求方式
      String method = request.getMethod ( );
      if ( method.equalsIgnoreCase ( "POST" ) ) {
         //设置编码
         request.setCharacterEncoding ( encoding );
      }
      //放行
      filterChain.doFilter ( request , response );
   }
   @Override
   public void destroy ( ) {
   }
}

Web.xml中配置过滤器

   characterEncodingFilter
   com.njwbhz.mood.filter.CharacterEncodingFilter
  
      encoding
      UTF-8
  


   characterEncodingFilter
   *.do

删除注册、发布心情、修改心情Servlet中的设置编码删掉,让过滤器做事

测试，上述三个功能是否有乱码