利用java怎么为移动端写接口

//java端

package cotroller;

import java.util.HashMap;
import java.util.Map;
import java.util.List;

import javax.servlet.http.HttpServletRequest;

import jdk.nashorn.api.scripting.JSObject;
import model.Student;
import model.Teacher;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;



import dao.Get;
import dao.StudentDAO;

//登陆servlet
@Controller
public class LoginCotroller {  
  /**
   * 1. value="/doLogin/{username}/{password}" 拦截 xxx/doLogin/xx/xx
   * 2. @ResponseBody 使用此注解将返回数据类型封装json
   * 3. @PathVariable("username") 截取请求1.value中{username}的值
   * 4. Map<String, Object> 服务端将值放入map中再封装为json,客户端方便通过key取出value
   */
  
  StudentDAO studentDAO = new StudentDAO();//调用登陆判断方法
  
  @RequestMapping(value="/doLogin/{username}/{password}",method=RequestMethod.GET)
  @ResponseBody
  public Map<String, Object> getTeacher(@PathVariable("username") Integer username, @PathVariable("password") String password){  
    System.out.println("拦截了客户端json请求");
    Map<String, Object> map = new HashMap<String, Object>();
    
    if(studentDAO.loginByStudent(username, password)){
      System.out.println("密码正确");
      map.put("result", "1");
      return map; //封装为json返回给客户端
    }
      
    System.out.println("密码错误");
    map.put("result", "0");
    return map; //封装为json返回给客户端
  }

}

//ios端
#import <Foundation/Foundation.h>
#import <stdio.h>

int main(int argc, const char * argv[]) {
  @autoreleasepool {
  
    char oldUsername[128];
    char oldPassword[128];
    
    NSLog(@"请输入用户名 ：");
    scanf("%s", oldUsername);
    NSString *username = [NSString stringWithUTF8String:oldUsername]; //转换为NSString *
    NSLog(@"请输入密码 ：");
    scanf("%s", oldPassword);
    NSString *password = [NSString stringWithUTF8String:oldPassword]; //转换为NSString *
    
    //访问springMVC后台并解析返回的json数据
    //定义一个异常
    NSError *error;
    
    //定义请求action 使用stringWithFormat拼接字符串
    NSString *url = [NSString stringWithFormat:@"http://154212l6t7.imwork.net:27063/partyOS_APP/doLogin/%@/%@", username, password];
    
    //加载一个NSURL对象
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:url]];
    
    //发送请求 将请求的url数据放到NSData对象中
    NSData *response = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
    
    //NSJSONSerialization从response请求中解析出数据放到字典中
    NSDictionary *jsonResult = [NSJSONSerialization JSONObjectWithData:response options:NSJSONReadingMutableLeaves error:&error];
    
    NSString *resultValue = [jsonResult objectForKey:@"result"];
    
    NSLog(@"你的url是%@", url);
    NSLog(@"服务端返回值%@", resultValue);
    
    // oc字符串比较方法 resultValue isEqualToString:@"1"] 和java 的equlse类似
    if([resultValue isEqualToString:@"1"]){
      NSLog(@"登录成功!");
    }else{
      NSLog(@"登录失败,用户名或密码错误!");
    }
    
    
  }
  return 0;
}