filter编码过滤器

一、编码过滤器的应用：

在应用struts框架时，有时需要文件的读取或者上传，会出现中文的乱码问题。此时，需要定义一个filter编码过滤器，解决中文乱码问题。

二、过滤器代码实现：

Filter源文件：

package com.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;

 

public class EncodingFilter implements Filter {

   

    public void destroy() {

 

    }

 

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {

       request.setCharacterEncoding("GB18030");

       chain.doFilter(request, response);

    }

 

    public void init(FilterConfig config) throws ServletException {

      

    }

}

 

web.xml中配置：

  <!-- 编码过滤器 -->

  <filter>

    <filter-name>encodingFilter</filter-name>

    <filter-class>com.filter.EncodingFilter</filter-class>

  </filter>

 

  <filter-mapping>

    <filter-name>encodingFilter</filter-name>

    <url-pattern>/*</url-pattern>

  </filter-mapping>

    <filter-mapping>

    <filter-name>encodingFilter</filter-name>

    <url-pattern>*.jsp</url-pattern>

  </filter-mapping>

    <filter-mapping>

    <filter-name>encodingFilter</filter-name>

    <url-pattern>*.do</url-pattern>

  </filter-mapping>