JAVA多线程提高接口响应速度实例

缺乏、安全感 2022-11-27 06:55 137阅读 0赞

package com.ctx.controller;
    
    import java.util.concurrent.Callable;
    import java.util.concurrent.ExecutionException;
    import java.util.concurrent.FutureTask;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import com.alibaba.fastjson.JSON;
    import com.alibaba.fastjson.JSONObject;
    import com.ctx.bean.Achievement;
    import com.ctx.bean.Student;
    import com.ctx.service.StudentService;
    
    @RestController
    public class StudentController {
    	@Autowired
    	private StudentService studentService;
    
    	//单线程串行执行
    	@GetMapping("/studentInfo")
    	public String studentInfo(Long no) {
    		//开始时间
    		Long startTime = System.currentTimeMillis();
    		//查询学生成绩
    		Achievement achievement = studentService.findAchievementByNo(no);
    		//查询学生基本信息
    		Student student = studentService.findStudentByNo(no);
    		String achievementStr = JSON.toJSONString(achievement);
    		String studentStr = JSON.toJSONString(student);
    		JSONObject achievementJson = JSONObject.parseObject(achievementStr);
    		JSONObject studentJson = JSONObject.parseObject(studentStr);
    		
    		JSONObject jsonObject = new JSONObject();
    		jsonObject.putAll(achievementJson);
    		jsonObject.putAll(studentJson);
    		String result = jsonObject.toString();
    		//结束时间
    		Long endTime = System.currentTimeMillis();
    		Long diffTime=endTime-startTime;
    		System.out.println("代码执行时间:"+diffTime);
    		return result;
    	}
    
    	//多线程并行执行
    		@GetMapping("/studentInfo2")
    		public String studentInfo2(Long no) {
    			//开始时间
    			Long startTime = System.currentTimeMillis();
    			//学生成绩
    			Callable<JSONObject> achievementJSON = new Callable<JSONObject>() {
    				@Override
    				public JSONObject call() throws Exception {
    					Achievement achievement = studentService.findAchievementByNo(no);
    					String achievementStr = JSON.toJSONString(achievement);
    					JSONObject achievementJson = JSONObject.parseObject(achievementStr);
    					return achievementJson;
    					//return null;
    				}
    			};
    			//学生基本信息
    			Callable<JSONObject> studentJSON = new Callable<JSONObject>() {
    				@Override
    				public JSONObject call() throws Exception {
    					//查询学生基本信息
    					Student student = studentService.findStudentByNo(no);
    					String studentStr = JSON.toJSONString(student);
    					JSONObject studentJson = JSONObject.parseObject(studentStr);
    					return studentJson;
    				}
    			};
    			FutureTask<JSONObject> achievementFutureTask = new FutureTask<JSONObject>(achievementJSON);
    			FutureTask<JSONObject> studentFutureTask = new FutureTask<JSONObject>(studentJSON);
    			//执行线程
    			new Thread(achievementFutureTask).start();
    			new Thread(studentFutureTask).start();
    			
    			JSONObject jsonObject = new JSONObject();
    			try {
    				//get()阻塞监听call()方法的返回值。
    				jsonObject.putAll(achievementFutureTask.get());
    				jsonObject.putAll(studentFutureTask.get());
    			} catch (InterruptedException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			} catch (ExecutionException e) {
    				// TODO Auto-generated catch block
    				e.printStackTrace();
    			}
    			
    			String result = jsonObject.toString();
    			//结束时间
    			Long endTime = System.currentTimeMillis();
    			Long diffTime=endTime-startTime;
    			System.out.println("代码执行时间:"+diffTime);
    			return result;
    		}
    }