后台解决跨域问题的几种方式

一、Spring跨域拦截注解方式配置

1、spring版本至少在4.2以上，本人使用的是4.3

2、跨区没配置之前请求访问会报错
请求方式：

当前域地址：http://192.168.1.78:9080/testGit/

(index):1 Failed toload http://192.168.1.78:8800/bronzecoll/share/shareNews?id=1: No'Access-Control-Allow-Origin' header is present on the requested resource.Origin 'http://192.168.1.78:9080' is therefore not allowed access.

请求服务端地址：http://192.168.1.78:8800/bronzecoll/share/shareNews?id=1

服务端配置：

Controller头部配置注解：@CrossOrigin(origins = "*", maxAge = 3600)//跨越请求配置

3、配置后请求访问

数据获取就正常了

二 、使用过滤器拦截请求，增加请求头

1、新建一个Filter类： Filter是一个过滤器。对你设定的请求地址进行拦截，然后设置。

package com.jgonet.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 HeaderFilter implements Filter   
{   
    public void doFilter(ServletRequest request, ServletResponse resp, FilterChain chain) throws IOException, ServletException  
    {  
    HttpServletResponse response = (HttpServletResponse) resp; response.setHeader("Access-Control-Allow-Origin", "*"); //解决跨域访问报错   
    response.setHeader("Access-Control-Allow-Methods", "POST, PUT, GET, OPTIONS, DELETE");   
    response.setHeader("Access-Control-Max-Age", "3600"); //设置过期时间   
    response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, client_id, uuid, Authorization");   
    response.setHeader("Cache-Control", "no-cache, no-store, must-revalidate"); // 支持HTTP 1.1.   
    response.setHeader("Pragma", "no-cache"); // 支持HTTP 1.0. response.setHeader("Expires", "0");   
    chain.doFilter(request, resp);   
    }   
    public void init(FilterConfig filterConfig) {}   
    public void destroy() {}  
} 

2、在web.xml中配置：加入下面的代码。com.jgonet.filter.HeaderFilter是我类HeaderFilter的路径，你自己记得改下，放在哪个路径下就该成哪个。

     
     HeaderFilter  
     com.jgonet.filter.HeaderFilter  
     
     
     HeaderFilter  
     /*  
   

3、 ajax调用 ：这里url中192.169.2.80是我电脑的ip地址，8080是我电脑的tomcat的端口号，procePlatform项目名，employee/login.do接口路径。

    
    
    
    




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