gitee地址(需要自取)AopProxy重复提交: 防止重复提交 (gitee.com)
@RestController
public class SubmissionController {
@Autowired
private 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。