lack——主页前后端开发优化（精华：java多线程实现数据插入）

lack——主页前后端开发优化

前端开发主页

1. 最容易的方式：list列表

   <template>
     <van-card
         v-for="user in props.userList"
         :desc="user.profile"
         :title="`${user.username} (${user.planetCode})`"
         :thumb="user.avatarUrl"
     >
       <template #tags>
         <van-tag plain type="danger" v-for="tag in user.tags" style="margin-right: 8px; margin-top: 8px">
           {{ tag }}</van-tag>
       </template>
       <template #footer>
         <van-button size="mini">联系我</van-button>
       </template>
     </van-card>
   </template>
   
   <script setup lang="ts">
   import {UserType} from "../models/user";
   
   interface UserCardListProps{
     userList:UserType[];
   }
   
   const props = withDefaults(defineProps<UserCardListProps>(),{
    // @ts-ignore
     userList:[] as UserType[],
   });
   
   </script>
   
   <style scoped>
   
   </style>
   

后端接口开发（精华：java多线程实现数据插入）

1. 对接主页接口开发

    /**
    * 首页推荐接口
    * @param request
    * @return
    */
   @GetMapping("/recommend")
   public BaseResponse<List<User>> recommendUsers(HttpServletRequest request) {
       QueryWrapper<User> queryWrapper = new QueryWrapper<>();
       List<User> userList = userService.list(queryWrapper);
       List<User> list = userList.stream().map(user -> userService.getSafetyUser(user)).collect(Collectors.toList());
       return ResultUtils.success(list);
   }
   

2. 优化对接主页接口开发（分页查询）

   /**
    * 首页推荐接口(分页查询)
    * @param request
    * @return
    */
   @GetMapping("/recommend")
   public BaseResponse<Page<User>> recommendUsers(long pageSize,long pageNum,HttpServletRequest request) {
       QueryWrapper<User> queryWrapper = new QueryWrapper<>();
       Page<User> userList = userService.page(new Page<>(pageNum,pageSize),queryWrapper);
       return ResultUtils.success(userList);
   }
   

3. 模拟大量用户状态
   • 导入用户数据方式
     1. 可视化界面导入
     2. 执行sql语句
     3. 写程序：使用for循环，可以分批导入（保证可控性）。
        1. 编写一次性任务批量插入（for循环插入数据问题：建立释放连接，for循环是绝对线性的）

           @Component //成为spring bean
           public class InsertUsers {
           
           @Resource
           private UserMapper userMapper;
           @Resource
           private UserService userService;
           
           public void doInsertUser(){
           StopWatch stopWatch = new StopWatch();
           stopWatch.start();
           final int INSERT_NUM = 1000;
           List<User> userList = new ArrayList<>();
           for (int i = 0; i < INSERT_NUM; i++) {
               User user = new User();
               user.setUsername("假二哈");
               user.setUserAccount("FakeErha");
               user.setAvatarUrl("https://tse4-mm.cn.bing.net/th/id/OIP-C.DMY4H6Xibxdrzf-hkElvZgHaDu?w=326&h=176&c=7&r=0&o=5&pid=1.7");
               user.setGender(0);
               user.setUserPassword("12345678");
               user.setPhone("13987496799");
               user.setEmail("[email protected]");
               user.setUserStatus(0);
               user.setUserRole(0);
               user.setPlanetCode("1111111");
               user.setTags("[]");
               userList.add(user);
           
           }
           userService.saveBatch(userList,100);
           stopWatch.stop();
           System.out.println(stopWatch.getTotalTimeMillis()); }
           }
           

        2. 并发要注意执行的前后顺序无所谓，不要用到非并发类的集合如list

           /**
            * 自定义线程池
            * 参数含义：默认多少线程池，最大多少，线程存活时间，线程单位，任务队列
            */
           private ExecutorService executorService = new ThreadPoolExecutor(60,1000, 10000,TimeUnit.MINUTES,new ArrayBlockingQueue<>(10000));
           /**
            * 并发批量插入数据
            */
           public void doConcurrencyInsertUser(){
               StopWatch stopWatch = new StopWatch();
               stopWatch.start();
               int batchSize = 5000;
               //10万条数据分成10组每组1万条
               int j = 0;
               List<CompletableFuture<Void>> futuresList = new ArrayList<>();
                for (int i = 0; i <20; i++) {
                   List<User> userList = Collections.synchronizedList(new ArrayList<>());
                   while (true) {
                       j++;
                       User user = new User();
                       user.setUsername("假二哈呀");
                       user.setUserAccount("FakeErha");
                       user.setAvatarUrl("https://tse4-mm.cn.bing.net/th/id/OIP-C.DMY4H6Xibxdrzf-hkElvZgHaDu?w=326&h=176&c=7&r=0&o=5&pid=1.7");
                       user.setGender(0);
                       user.setUserPassword("12345678");
                       user.setPhone("13987496799");
                       user.setEmail("[email protected]");
                       user.setUserStatus(0);
                       user.setUserRole(0);
                       user.setPlanetCode("1111111");
                       user.setTags("[]");
                       userList.add(user);
                       if (j % batchSize == 0) {
                           break;
                       }
                   }
                   //新建一个异步的任务，不要返回值，使用此方法里面的操作就是异步的
                   CompletableFuture<Void> feature = CompletableFuture.runAsync(() -> {
                       System.out.println("ThreadName:" + Thread.currentThread().getName());
                       userService.saveBatch(userList, batchSize);
                   },executorService);
                   futuresList.add(feature);
               }
                CompletableFuture.allOf(futuresList.toArray(new CompletableFuture[]{ }));
               stopWatch.stop();
               System.out.println(stopWatch.getTotalTimeMillis());
           
           }
           

效果展示