模拟防止重复提交
gitee地址（需要自取）AopProxy重复提交: 防止重复提交 (gitee.com)
@RestController
public class SubmissionController {@Autowiredprivate SubmissionService submissionService;private static Jedis jedis = new Jedis("localhost",6379);private String lock = "lock";private String lockValue = "locked";private int gqsj = 5;private String ok = "OK";@PostMapping("/submit")public void handleSubmitForm(@RequestParam String name, @RequestParam int age) {SubmissionService submissionServiceProxy = (SubmissionService) Proxy.newProxyInstance(submissionService.getClass().getClassLoader(), new Class[]{SubmissionService.class}, (proxy, method, args) -> {SetParams params = new SetParams();params.nx().ex(gqsj);String res = jedis.set(lock, lockValue,params);if (ok.equals(res)){Object invoke = method.invoke(submissionService,name,age);System.out.println("提交成功");return invoke;}else {System.out.println("不允许重复提交");return null;}});submissionServiceProxy.insert(name, age);// 存疑？第一天晚上return null后汇报一个空指针错误，奇怪的是第二天不报错了
// 希望懂得大佬给小弟支个招// try{
// submissionServiceProxy.insert(name, age);
// }catch (NullPointerException e){
// System.out.println("禁止重复提交");
// }}
}思路就是使用代理来执行方法，使用aop的思想对其进行切片，在执行方法前加一个分布式锁，这里分布式锁采用的是redis.nx,并加上一个过期时间防止死锁。整体只做了一个简单模拟，写的比较简单，有错误或不足的地方，还请指正，共同进步。