登陆、注册和修改密码的API。 用Android Studio写登陆注册功能时可以用POST功能直接调用。 服务器返回json，成功就是success，失败就是false。 调用方法如下：
private void postRequest(String name,String pwd, String phone) {
//建立请求表单，添加上传服务器的参数
RequestBody formBody = new FormEncodingBuilder()
.add("username",name)
.add("pswd",pwd)
.add("phone",phone)
.add("method","okhttpreg")
.build();
//发起请求
final Request request = new Request.Builder()
.url("http://39.96.191.xx:8080/LoginServers/RegisterAction")//IP是我的阿里云
.post(formBody)
.build();
//新建一个线程，用于得到服务器响应的参数
new Thread(new Runnable() {
@Override
public void run() {
Response response = null;
try {
//回调
response = client.newCall(request).execute();
if (response.isSuccessful()) {
String str = response.body().string();
System.out.println(str.substring(17, 24));
if(str.substring(17, 24).equals("success")) {
Intent intent = new Intent();
intent.setClass(RegisterActivity.this, Reg_successActivity.class);
RegisterActivity.this.startActivity(intent);
} else{
Looper.prepare();
Toast.makeText(RegisterActivity.this, "账号已存在", Toast.LENGTH_SHORT).show();
Looper.loop();
}
} else {
Log.d("RegisterActivity", "fffffff1");
throw new IOException("Unexpected code:" + response);
}
} catch (IOException e) {
Log.d("RegisterActivity", "fffffff2");
e.printStackTrace();
}
}
}).start();
}
}