JAVA高级面试进阶训练营视频教程

admin

编写一个Filter

package com.zns.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;
import javax.servlet.http.HttpServletResponse;

public class CorsFilter implements Filter {

    @Override  
    public void init(FilterConfig filterConfig) throws ServletException {  
    // TODO Auto-generated method stub         
    }  
       
    @Override  
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,  
    ServletException {  
    // TODO Auto-generated method stub  
    HttpServletResponse res = (HttpServletResponse) response;  
    res.setContentType("text/html;charset=UTF-8");  
       res.setHeader("Access-Control-Allow-Origin", "*");  
       res.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");  
       res.setHeader("Access-Control-Max-Age", "0");  
       res.setHeader("Access-Control-Allow-Headers", "Origin, No-Cache, X-Requested-With, If-Modified-Since, Pragma, Last-Modified, Cache-Control, Expires, Content-Type, X-E4M-With,userId,token");  
       res.setHeader("Access-Control-Allow-Credentials", "true");  
       res.setHeader("XDomainRequestAllowed","1");  
       chain.doFilter(request, response);  
    }  
       
    @Override  
    public void destroy() {  
    // TODO Auto-generated method stub     
    }  

}

 

在项目下的web.xml增加如下配置即可

<filter>
    <filter-name>cors</filter-name>
    <filter-class>com.zns.filter.CorsFilter</filter-class>
</filter>
<filter-mapping>
    <filter-name>cors</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>