一、创建
二、完整代码
package com.ql;import lombok.SneakyThrows;import okhttp3.Call;import okhttp3.OkHttpClient;import okhttp3.Request;import okhttp3.Response;import java.io.IOException;public class Mythread extends Thread { public Mythread(String name) { super(name); } @SneakyThrows @Override public void run() { for (; ; ) { //锁的状态是默认是打开状态 //获取锁的状态 int lockStatus = this.findLockStatus(); if (lockStatus == 0) { //修改锁的状态 =>>锁定 this.locked(); //获取总票数 int tickets = this.findTickets(); //剩余票数 int i = this.remainVotes(); //判断票数 if (tickets < 1) { //已售卖完 跳出循环 break; } else { //卖一张票 int remainVotes = this.saleOneTicket(); System.out.println(this.getName() + "当前的票数:" + tickets); System.out.println(this.getName() + "售票后:" + remainVotes); // 释放锁 this.unlock(); } } } } /** * 剩余票数 * * @return * @throws IOException */ private int remainVotes() throws IOException, InterruptedException { OkHttpClient okHttpClient = new OkHttpClient(); Request request = new Request.Builder().url("http://localhost:8080/lock/remainVotes").build(); Call call = okHttpClient.newCall(request); Response response = call.execute(); String string = response.body().string(); int ticketsVote = Integer.parseInt(string); return ticketsVote; } /** * 释放锁 */ private void unlock() throws IOException { OkHttpClient okHttpClient = new OkHttpClient(); Request request = new Request.Builder().url("http://localhost:8080/lock/unlock").build(); Call call = okHttpClient.newCall(request); Response response = call.execute(); } /** * 卖票一张 */ private int saleOneTicket() throws IOException { OkHttpClient okHttpClient = new OkHttpClient(); Request request = new Request.Builder().url("http://localhost:8080/lock/saleOneTicket").build(); Call call = okHttpClient.newCall(request); Response response = call.execute(); String string = response.body().string(); int remainVotes = Integer.parseInt(string); return remainVotes; } /** * 获取锁的状态 */ private int findLockStatus() throws IOException { OkHttpClient okHttpClient = new OkHttpClient(); Request request = new Request.Builder().url("http://localhost:8080/lock/findLock").build(); Call call = okHttpClient.newCall(request); Response response = call.execute(); String string = response.body().string(); int lockStatus = Integer.parseInt(string); return lockStatus; } /** * 修改锁状态 */ private int locked() throws IOException { OkHttpClient okHttpClient = new OkHttpClient(); Request request = new Request.Builder().url("http://localhost:8080/lock/locked").build(); Call call = okHttpClient.newCall(request); Response response = call.execute(); String string = response.body().string(); int lockStatus = Integer.parseInt(string); return lockStatus; } /** * 查看总票数 * * @throws IOException */ private int findTickets() throws IOException { OkHttpClient okHttpClient = new OkHttpClient(); Request request = new Request.Builder().url("http://localhost:8080/lock/findTickets").build(); Call call = okHttpClient.newCall(request); Response response = call.execute(); String string = response.body().string(); Integer tickets = Integer.parseInt(string); return tickets; }}
package com.ql;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;@RestController@RequestMapping("/lock")public class ClientService { /** * 总票数 */ private static Integer tickets = 100; /** * 锁的状态 0:未锁 1:锁 */ private static Integer lockStatus = 0; /** * 卖票 */ @RequestMapping("/saleOneTicket") public Integer saleOneTicket() { return tickets = tickets - 1; } /** * 查看总票数 */ @RequestMapping("/findTickets") public Integer findTickets() { return tickets; } /** * 查看锁的状态 */ @RequestMapping("/findLock") public synchronized Integer findLock() { Integer lock=lockStatus; //改变锁状态,使线程串行执行 this.locked(); return lock; } /** * 改变锁状态 */ @RequestMapping("/locked") public synchronized int locked() { //更改锁的状态为1(上锁),避免多个线程同时获取锁的状态都为0(未上锁),从而导致线程安全问题 lockStatus = 1; return lockStatus; } /** * 释放锁 */ @RequestMapping("/unlock") public synchronized int unlock() { return lockStatus = 0; } /** * 剩余票数 * * @return */ @RequestMapping("/remainVotes") public int remainVotes() { return tickets; }}
三、流程图解析
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