controller返回响应后，继续执行其他逻辑

妖狐艹你老母 2023-10-05 14:03 25阅读 0赞

## 通过response返回响应 ##

@PostMapping("/test/1")
        public Object earlyReturn(HttpServletRequest request, HttpServletResponse response) throws Exception {
        
            JSONObject resp = new JSONObject();
            resp.put("uri", request.getRequestURI());
            resp.put("url", request.getRequestURL());
    
            //设置响应报文为json格式
            response.setHeader(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE);
    
            PrintWriter out = response.getWriter();
            out.print(resp.toString());//设置响应报文
            out.close();//强制返回
            System.out.println("http响应已返回 " + System.currentTimeMillis());
    
            System.out.println("响应返回后，可以继续执行其他逻辑..." + System.currentTimeMillis());
            Thread.sleep(3000);//模拟耗时
            System.out.println("执行完毕 " + System.currentTimeMillis());
    
            return null;
        }

## 通过线程执行耗时逻辑 ##

进一步优化则可通过线程池执行逻辑

@PostMapping("/test/2")
        public Object earlyReturn2(HttpServletRequest request, HttpServletResponse response) throws Exception {
        
            JSONObject resp = new JSONObject();
            resp.put("uri", request.getRequestURI());
            resp.put("url", request.getRequestURL());
    
            System.out.println("创建新线程去执行其他逻辑，不会阻塞当前请求");
            new Thread(new Runnable() {
        
                @Override
                public void run() {
        
                    System.out.println("新线程内逻辑执行..." + System.currentTimeMillis());
                    try {
        
                        Thread.sleep(3000);
                    } catch (InterruptedException e) {
        
                        e.printStackTrace();
                    }
                    System.out.println("执行完毕 " + System.currentTimeMillis());
                }
            }).start();
    
            System.out.println("http响应返回 " + System.currentTimeMillis());
            return resp;
        }