java解决跨域

最简单的方法就是添加这么一句

response.setHeader("Access-Control-Allow-Origin", "*");

也可以添加拦截器

@Interceptor
public class SimpleCORSFilter implements HandlerInterceptor  {

    @Override
    public boolean preHandle(HttpServletRequest request,
            HttpServletResponse response, Object handler) throws Exception {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
    public void postHandle(HttpServletRequest req,
            HttpServletResponse resp, Object handler,
            ModelAndView modelAndView) throws Exception {
        resp.setHeader("Access-Control-Allow-Origin", "*"); 
        resp.setHeader("Access-Control-Allow-Methods", "*");
        resp.setHeader("Access-Control-Allow-Headers", "Content-Type,XFILENAME,XFILECATEGORY,XFILESIZE");
        resp.setHeader("Access-Control-Max-Age", "3600");
        if (req.getMethod().equals("OPTIONS")) {
            resp.setStatus(HttpStatus.SC_OK);
            resp.getWriter().write("OPTIONS returns OK");
        }
    }

    @Override
    public void afterCompletion(HttpServletRequest request,
            HttpServletResponse response, Object handler, Exception ex)
            throws Exception {
        // TODO Auto-generated method stub
        
    }

}

<mvc:interceptors>
        <mvc:interceptor>
            <mvc:mapping path="/action/**"/>
            <bean class="com.xiang.filter.SimpleCORSFilter"> 
                       </bean>
         </mvc:interceptor>
    </mvc:interceptors>

              <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpcore</artifactId>
            <version>4.4.5</version>
        </dependency>

 大家觉得不错的话可以支持一下