SpringBoot 入门 参数接收 必传参数 数组 集合 时间接收

接口声明

@RestController
//表示该类为请求处理类public class HttpDeal {@RequestMapping("/login")//这个方法处理哪一个地址过来的请求public String hello(){return "返回给浏览器";}}

---

接收参数

  @RequestMapping("/login")public  String login(int id,String password){return "登录成功"+id;}

传递参数与接收参数不一致 必传参数

使用@RequestParam进行映射，前端只需要给name传递值即可 name=id，设置了@RequestParam参数必须传递否则报错，

 @RequestMapping("/login")public  String login(@RequestParam(name="name") int id, String password){return "登录成功"+id;}

设置非必传参数

@RequestParam(required = false)
//required 表示参数非必传

---

接收时间参数

pattern 表示传递的格式

@RequestMapping("/update")public  String login(@DateTimeFormat(pattern = "HH:mm") LocalTime time){System.out.println(time);return  "OK";}

JSON类型参数

{
"user":"123",
"password":"456"  
}

public class User {private String user;private String password;public String getUser() {return user;}public void setUser(String user) {this.user = user;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}@Overridepublic String toString() {return "User{" +"user='" + user + '\'' +", password='" + password + '\'' +'}';}
}

   @RequestMapping("/update")public  String login(@RequestBody User user){System.out.println(user.getPassword());return  "OK";}

数组参数接收

前端

http://127.0.0.1:8080/login?id=488&id=123&id=45

  @RequestMapping("/login")public  String login(String[] id){//id参数名需相同return Arrays.toString(id);}

列表参数接收

使用列表接收需要添加RequestParam 注解

http://127.0.0.1:8080/login?id=488&id=123&id=45

  @RequestMapping("/login")public  String login(@RequestParam List<String> id){System.out.println(id);return  "OK";}