SpringMVC 跨域请求

工作中，可能会开发 网站Api供客户访问，往往客户的入口与我们的Api不在同一个服务器上，这时候我们需要让http可以跨域请求。一种方式是让客户请求时，直接在header中添加允许跨域的属性，第二种方式就是我们在框架的过滤器中为header添加跨域属性，最新版的SpringMVC已经压缩成一个注解，直接使用。这里，我们贴一下旧版SpringMVC的跨域请求代码。

package com.img.utility;

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 SimpleCORSFilter implements Filter{
    @Override  
    public void destroy() {  
          
    }  
  
    @Override  
    public void doFilter(ServletRequest req, ServletResponse res,  
            FilterChain chain) throws IOException, ServletException {  
            HttpServletResponse response = (HttpServletResponse) res;  
            response.setHeader("Access-Control-Allow-Origin", "*");  
            response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");  
            response.setHeader("Access-Control-Max-Age", "3600");  
            response.setHeader("Access-Control-Allow-Headers", "x-requested-with");  
            chain.doFilter(req, res);  
          
    }  
  
    
    @Override  
    public void init(FilterConfig arg0) throws ServletException {  
          
    } 
}