前后端分离部署技术大体有几种：jsonp，CORS，nginx反向代理，其中jsonp不支持post方法，具体说下CORS技术。
前端请求代码不变，用jquery.ajax()去请求
$.ajax({ url:"http://127.0.0.1:8080/user/login", type:'post', dataType : 'json', data:params, contentType : "application/json", success:function(date){ dispalyLoad(); if(date==0){ location.href="user/action.html"; }else if(date==1){ alert("账号错误"); }else if(date==2){ alert("密码错误"); } } });后端我用的是spring boot ，实现解决跨域问题主要有两种实现
第一种，用Filter拦截器进行对HttpServletResponse增加header，具体代码如下：
@Component @ServletComponentScan @WebFilter(urlPatterns = "/*",filterName = "allFilter") 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 { HttpServletResponse res = (HttpServletResponse) response; res.setHeader("Access-Control-Allow-Origin", "*"); res.setHeader("Access-Control-Allow-Methods", "*"); res.setHeader("Access-Control-Max-Age", "1728000"); res.setHeader("Access-Control-Allow-Credentials", "true"); res.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept"); chain.doFilter(request, res); } @Override public void destroy() { // TODO Auto-generated method stub } }和spring mvc增加filter最大的区别就是spring boot提供了两个注解@ServletComponentScan @WebFilter省去了配置web.xml的麻烦，这样直接启动然后调用就可以实现前后端跨域了。
第二种办法就是增加一个aop切面，对所有的controller进行切面编程,从而增加header
先增加spring boot的aop依赖
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-aop</artifactId> </dependency>然后再写一个aop类，在头部插入Access-Control-Allow-Origin
public class ControllerAop { @Around("execution (* com.xx.controller.*.*(..))") public Object CORSAop(ProceedingJoinPoint pjp) throws Throwable{ HttpServletResponse response = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getResponse(); response.setHeader("Access-Control-Allow-Origin", "*"); response.setHeader("Access-Control-Allow-Methods","GET,POST,OPTIONS,PUT"); Object proceed = pjp.proceed(); return proceed; }这样就可以实现前后端跨域了
