SpringBoot基础入门

资料

路由映射

src/main/java/com/example/helloworld/controller/HelloController.java:

package com.example.helloworld.controller;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloController {

    //  http://localhost:8080/hello
    //  http://localhost:8080/hello?nickname=zhangsan&phone=13812345678
    @RequestMapping(value = "/hello", method = RequestMethod.GET) //这样就只能接收get请求
    // 上面这行等价于@GetMapping("hello")
    public String hello(String nickname, String phone) { // 获取到传递的参数
        System.out.println(phone);
        return "你好" + nickname + "\n你的手机号为" + phone;
    }
}

参数传递和数据响应

src/main/java/com/example/helloworld/controller/ParamsController.java:

package com.example.helloworld.controller;

import com.example.helloworld.entity.User;
import org.springframework.http.HttpMethod;
import org.springframework.web.bind.annotation.*;

@RestController
public class ParamsController {

    @RequestMapping(value = "/getTest1", method = RequestMethod.GET) // 必须是get请求才会响应
    public String getTest1() {
        return "爽哥提示：这是一个GET请求";
    }

    @RequestMapping(value = "/getTest2", method = RequestMethod.GET)
//  http://localhost:8080/getTest2?nickname=xxx&phone=xxx
    public String getTest2(String nickname, String phone) {
        System.out.println("nickname:" + nickname);
        System.out.println("phone:" + phone);
        return "GET请求，参数nickname为:" + nickname;
    }

    @RequestMapping(value = "/getTest3", method = RequestMethod.GET)
//  http://localhost:8080/getTest3?nickname=xxx
    // 如果前端传递的参数名称，和我方法里定义的变量名称对应不上，可以通过使用@RequestParam注解的方式做一下映射
    // 加了这个映射，就要求nickname这个参数就必须传递，否则报400；可以加上required = false解决
    public String getTest3(@RequestParam(value = "nickname", required = false) String name) {
        System.out.println("nickname:" + name);
        return "GET请求，参数name为:" + name;
    }


    // localhost:8080/postTest1
    @RequestMapping(value = "/postTest1", method = RequestMethod.POST)
    public String postTest1() {
        return "爽哥提示: 这是一个POST请求";
    }

    @RequestMapping(value = "/postTest2", method = RequestMethod.POST)
    public String postTest2(String username, String password) {
        // 接收Body form-data格式的数据；或者是Query Params格式(即像get一样?放在路径后面)
        System.out.println("username:" + username);
        System.out.println("password:" + password);
        return "爽哥提示: 这是一个POST请求,username为：" + username + "， password为：" + password;
    }

    @RequestMapping(value = "/postTest3", method = RequestMethod.POST)
    public String postTest3(User user) { // 在entity定义一个User class
        // 和上方的case2一样，接收Body form-data格式的数据；或者是Query Params格式(即像get一样?放在路径后面)
        System.out.println(user);
        return "爽哥提示: 这是一个POST请求,username为：" + user.getUsername() + "， password为：" + user.getPassword();
    }

    @RequestMapping(value = "/postTest4", method = RequestMethod.POST)
    public String postTest4(@RequestBody User user) { // 接收JSON类型,需要加@RequestBody注解
        System.out.println(user);
        return "爽哥提示: 这是一个POST请求,username为：" + user.getUsername() + "， password为：" + user.getPassword();
    }

    @GetMapping("/test/*")
    public String test() {
        return "通配符请求";
    }
}

src/main/java/com/example/helloworld/entity/User.java:

package com.example.helloworld.entity;

public class User {
    private String username;
    private String password;

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @Override
    public String toString() {
        return "User{" +
                "username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

文章目录

1. 路由映射
2. 参数传递和数据响应

原文链接: https://dashen.tech/2012/11/12/SpringBoot基础入门/

版权声明: 转载请注明出处.