java web过滤器处理乱码

我们在servlet页面中读取前台的数据时  经常会出现乱码问题

而自己每次都要在servlet中使用

String encoding="utf-8"; 
request.setCharacterEncoding(enconding); 
response.setCharacterEncoding(enconding); 

来进行编码的转换  会很麻烦

所以使用过滤器 我们可以避免这些重复的工作

web.xml配置

 
 encodingFilter 
 com.scx.filter.Filter 
  
  
  encoding 
  utf-8 
  
  
  
  
 encodingFilter 
 /* 
  

Filter

package com.scx.filter; 
import java.io.IOException; 
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 Filter implements javax.servlet.Filter{ 
  //读取过滤器配置文件 
  private FilterConfig config; 
  public void destroy() { 
    // TODO Auto-generated method stub 
  } 
  public void doFilter(ServletRequest arg0, ServletResponse arg1, 
      FilterChain chain) throws IOException, ServletException { 
    // TODO Auto-generated method stub 
    HttpServletRequest request=(HttpServletRequest) arg0; 
    HttpServletResponse response=(HttpServletResponse) arg1; 
    String encoding=config.getInitParameter("encoding"); 
    if(encoding==null||"".equals(encoding)){ 
      encoding="utf-8"; 
    } 
    request.setCharacterEncoding(encoding); 
    response.setCharacterEncoding(encoding); 
    chain.doFilter(request, response); 
  } 
  public void init(FilterConfig arg0) throws ServletException { 
    // TODO Auto-generated method stub 
    config=arg0; 
  } 
} 

这样的话  在servlet里面读取到的数据就不会出现乱码的情况了

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