一、GetMapping
GetMapping的注解是调用的

@RequestMapping(
    method = {RequestMethod.GET}
)

1、创建person对象

package com.soul.java.springboot.domain;


import com.fasterxml.jackson.annotation.JsonFormat;
import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.annotation.JsonProperty;

import java.util.Date;

public class Person {
    private String name;



    private String password;


 
    private String phone;



    private Date birthday;


    public Person() {
    }

    public Person(String name, String password, String phone, Date birthday) {
        this.name = name;
        this.password = password;
        this.phone = phone;
        this.birthday = birthday;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getPassword() {
        return password;
    }

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

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }
}

2、创建MethodControler

package com.soul.java.springboot.controller;

import com.soul.java.springboot.domain.Person;
import org.springframework.web.bind.annotation.*;

import javax.servlet.http.HttpServletRequest;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;

@RestController
public class MethodControler {

    @GetMapping("json")
    public Person json() {
           return new Person("如花","000000","138 383 818 38",new Date());
    }

3、启动程序后Postman访问

image.png

4、开发常遇到的问题

• 使密码不显示
  在Person对象中的password属性上加 @JsonIgnore

import com.fasterxml.jackson.annotation.JsonIgnore;

    @JsonIgnore
    private String password;

修改后重新请求，密码已经不返回了

image.png

• 对生日进行格式化
  在Person对象中的birthday属性上加 @JsonFormat(pattern = "YYYY-MM-dd HH:mm:ss")

import com.fasterxml.jackson.annotation.JsonFormat;

    @JsonFormat(pattern = "YYYY-MM-dd HH:mm:ss")
    private Date birthday;

修改后重新请求

image.png

• 使phone返回时显示account

import com.fasterxml.jackson.annotation.JsonProperty;

    @JsonProperty("account")
    private String phone;

修改后

image.png

• 当phone为空Null,不进行传递。将Controller返回值修改为
  return new Person("如花", "000000", null, new Date());

import com.fasterxml.jackson.annotation.JsonInclude;


    @JsonProperty("account")
    @JsonInclude(JsonInclude.Include.NON_NULL) //当电话为null时就不传
    private String phone;

效果

image.png

二、GetMapping接收参数
1、在MethodControler中添加方法，进行占位传递

 //gradeId classId将从外面传进来  接收参数
    @GetMapping(path = "/{grad_id}/{class_id}")
    public Object find(@PathVariable("grad_id") String gradeId, @PathVariable("class_id") String classId) {
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("gradeid", gradeId);
        map.put("classid", classId);

        return map;
    }

Postman进行请求

image.png

2、在MethodControler中添加方法

 @GetMapping("/query")
    public Object query(int from, int size) {
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("from", from);
        map.put("size", size);
        return map;
    }

Postman进行请求,params中进行传参from 和size

image.png

3、在MethodControler中添加方法

 @GetMapping("/query2")
    public Object query2(@RequestParam(defaultValue = "0", name = "page") int from, int size) {
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("from", from);
        map.put("size", size);
        return map;
    }

Postman进行请求，只传参size，因为from有一个默认值

image.png

因为给from加了一个page的名字，所以此时要给from传值，需写page，写from接收不到！

image.png

4、token权限的控制，在MethodControler中添加方法

 @GetMapping("/header")
    public Object header(@RequestHeader("token") String token, String id) {
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("token", token);
        map.put("id", id);

        if (token.equals("admin")) {
            return "can do something";
        } else {
            return "no Permission";
        }
    

postman进行请求，token从headers中进行传递，id中params中进行传递

image.png

image.png

5、从HttpServletRequest接收参数，在MethodControler中添加方法

  @GetMapping("/request")
    public Object request(HttpServletRequest request) {
        String name = request.getParameter("name");
        String password = request.getParameter("password");

        Map<String, Object> map = new HashMap<String, Object>();
        map.put("name", name);
        map.put("password", password);
        return map;
    }

Postman请求，params中传递参数

image

三、PostMapping和DeleteMapping
1、PostMapping

  @PostMapping("/login")
    public Object login(String username, String password) {
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("username", username);
        map.put("password", password);
        return map;
    }

从Body中传递参数

image.png

2、DeleteMapping

    @DeleteMapping("/del")
    public Object del(String id) {
        Map<String, Object> map = new HashMap<String, Object>();
        map.put("id", id);
        return map;
    }

image.png