web项目 Filter 配置

sunday_jia

1.在web.xml中添加

<filter>

<filter-name>Character Encoding</filter-name>

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

</filter>

<filter-mapping>

<filter-name>Character Encoding</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

2.新建处理类

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 CharsetEncodingFilter implements Filter {

    private String defaultEncode = "UTF-8";

    public void init(FilterConfig config) throws ServletException {

        if(config.getInitParameter("charset")!=null){

            defaultEncode=config.getInitParameter("charset");

        }

    }

    public void destroy() {

     defaultEncode = null;

    }

    public void doFilter(ServletRequest request, 

     ServletResponse response,

     FilterChain chain) 

     throws IOException, ServletException {

        ServletRequest srequest=request;

        srequest.setCharacterEncoding(defaultEncode);

        chain.doFilter(srequest,response);

    }

}