jsonp+springmvc解决跨域问题

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aram(value = "callback",required = false) String callback,                                           HttpServletResponse response) throws CustomException {         long t0 = System.currentTimeMillis();         searchType = StringUtils.trim(searchType);         searchContent = StringUtils.trim(searchContent);           if (StringUtils.isBlank(searchType) || StringUtils.isBlank(searchContent)) {             throw new CustomException("搜索条件为空");         }           log.debug("Request param [searchType]:{},[searchContent]: {} ",searchType,searchContent);           ResponseResult responseResult = new ResponseResult();         switch (searchType) {             case "身份证号":                 responseResult = graphService.selectByCertNo4Smart(searchContent);                 break;             case "姓名":                 responseResult = graphService.selectByName4Smart(searchContent);                 break; //            case "客户类型": //                graph = graphService.selectByCustType4Smart(Profile.CustType.matchDescToCode(searchContent)); //                break;             case "手机号":                 responseResult = graphService.selectByPhone4Smart(searchContent);                 break;             default:    //剩下都是根据边查找     计算出md5 然后根据 vid查找 //                String vid = MD5Utils.md5(searchType + searchContent);                 responseResult = graphService.selectByEdge4Smart(searchType,searchContent);         }           Graph graph = (Graph) responseResult.getData();         //为下文日志打印服务         if (graph == null) {             graph = new Graph(null,null);         }         log.info("Number of node: " + (graph.getNodes() == null ? 0 : graph.getNodes().size()));         log.info("Number of edge: " + (graph.getEdges() == null ? 0 : graph.getEdges().size()));           long t1 = System.currentTimeMillis();         log.info("Request processing time: " + (t1 - t0) + "ms");           //构造MappingJacksonValue,SpringMVC配合jsonp解决浏览器跨域访问问题         MappingJacksonValue mjv = new MappingJacksonValue(responseResult);         mjv.setJsonpFunction(callback);             return mjv;     } ```jsonp+springmvc解决跨域问题