本文主要是Spring+SpringMVC+MyBatis/MyBatis Plus框架环境，包括SpringBoot同样适用。
1.编写拦截器
package com.interceptor; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.web.servlet.HandlerInterceptor; import org.springframework.web.servlet.ModelAndView; public class CORSInterceptor implements HandlerInterceptor { @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { response.addHeader("Access-Control-Allow-Origin", "*"); return true; } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { } @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { } }
2.在spring-mvc.xml文件配置拦截器
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/**"/>
<bean class="com.interceptor.CORSInterceptor"/>
</mvc:interceptor>
</mvc:interceptors>
3.编写html代码测试
<html> <head> <meta charset="utf-8"> <script src="jquery-1.8.0.min.js"></script> <script> function test(){ var str="test"; $.ajax({ url:"http://192.168.1.125:8080/test-web/user/getCookie", type:"POST", data : {"str":str}, dataType : 'json', success:function(data){ alert(data.returnMsg); },error:function(XMLHttpRequest, textStatus, errorThrown){ alert(XMLHttpRequest.status); alert(XMLHttpRequest.readyState); alert(textStatus); } }); } </script> </head> <body onload="test()"> </body>
在没有配置拦截器的情况下，会出现如下结果:
配置了拦截器则会正常返回对应的信息。