java笔记

1.postman 接口请求
方式一：postman
方式二：火狐
方式三：idea –tools—http client—Test restful web service

POST https://ip:8080/xx/login
Accept: */*
Content-Type:  application/json; charset=utf8
Cache-Control: no-cache

{
  "userName": "",
  "password": "",
  "scope":"0"
}
> {% client.global.set("Auth-Token", response.headers.valueOf("Auth-Token"));
     client.global.set("ip", "xx");
%}
###

GET https://ip:8080/getdata
Accept: */*
Content-Type: application/json; charset=utf8
Cache-Control: no-cache
X-Auth-Token: {{Auth-Token}}


单例模式
private static final Test2 test2 = new Test2(); //饿汉式，类初始化时已经自行实例化
    public static Test2 getInstance() {
        return test2;
    }

    /**
     * 懒汉式，双重检查加锁(推荐，适用于多线程)
     * @return
     */
   private static Test1025 instance = null;
    public static Test1025 getTest() {
        if (instance == null) {
            synchronized (Test1025.class) {
                if (instance == null) {
                    instance = new Test1025();
                }
            }
        }
        return instance;
    }