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接口请求中的参数(@PathVariable,@RequestP

接口请求中的参数(@PathVariable,@RequestP

作者: 一个半吊子工程师 | 来源:发表于2020-05-13 17:30 被阅读0次

    参考文章 https://www.cnblogs.com/anywherego/p/9600871.html

    SpringBoot提供的获取参数注解包括:@PathVariable@RequestParam@RequestBody,三者的区别如下表:

    image

    示例代码:

    Order:

    package com.example.demo.controller.user.entity;
    
    public class Order {
        private Integer id;
        private String name;
        private Integer price;
    
        public Integer getId() {
            return id;
        }
    
        public void setId(Integer id) {
            this.id = id;
        }
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public Integer getPrice() {
            return price;
        }
    
        public void setPrice(Integer price) {
            this.price = price;
        }
    }
    

    OrderController

    package com.example.demo.controller.user.controller;
    
    import com.example.demo.controller.user.entity.Order;
    import org.springframework.web.bind.annotation.*;
    
    @RestController
    public class OrderController {
    
        /**
         * Get请求的参数可以通过@PathVariable和@RequestParam获取
         * @param id 必填
         * @param name 必填
         * @param price 选填,默认值为0
         * @return
         */
        @GetMapping("/orders/{id}")
        public String getOrder(@PathVariable(value = "id")Integer id,
                               @RequestParam(value = "name")String name,
                               @RequestParam(value = "price",required = false,defaultValue = "0") Integer price){
            String result = "id:"+id+",name:"+name+",price:"+price;
            return result;
        }
    
        /**
         * Post使用@RequestBody注解将Json格式的参数自动绑定到Entity类
         * @param order
         * @return
         */
        @PostMapping("/order/check")
        public String checkOrder(@RequestBody Order order){
            String result = "id:"+order.getId()+",name:"+order.getName()+",price:"+order.getPrice();
            return result;
        }
    
        /**
         * Post使用@RequestParam获取请求体中非Json格式的数据
         * @param amount
         * @param discount
         * @return
         */
        @PostMapping("/order/checkmore")
        public String checkMore(@RequestParam(value = "amount")Integer amount, @RequestParam(value = "discount")float discount){
            String result = "amount:"+amount+",discount:"+discount;
            return result;
        }
    
        /**
         * Post请求也可以直接与对象类绑定,但需要参数名一致,不支持json格式,只支持form-data和x-www.form-urlencoded格式
         * @param order
         * @return
         */
        @PostMapping("/order/add")
        public String addOrder(Order order){
            String result = "id:"+order.getId()+",name:"+order.getName()+",price:"+order.getPrice();
            return result;
        }
    
        /**
         * Put请求可以直接与对象类绑定,但需要参数名一致
         * @param id
         * @param order
         * @return
         */
        @PutMapping("/order/{id}/update")
        public String updateOrder(@PathVariable(value = "id")Integer id,Order order){
            String result = "pathid:"+id+"===Order(id:"+order.getId()+",name:"+order.getName()+",price:"+order.getPrice()+")";
            return result;
        }
    }
    

    注意点:

    1.针对一些非必填的参数,可以使用required关键字来标识,同时必须设置默认值defaultValue,如getOrder方法中对price参数的获取:

    @RequestParam(value = "price",required = false,defaultValue = "0") Integer price
    

    2.参数可以直接与Entity类绑定,但不支持json格式,只支持form-data
    x-www.form-urlencoded格式

      @PostMapping("/order/add")
    
      public String addOrder(Order order){
    

    3.使用的Postman做的测试,所有接口都测试通过,也推荐大家使用Postman作为日常的接口测试工具,安装和操作都很简单。

    附部分截图:

    Get:@PathVariable,@RequestParam

    image

    Post:@RequestBody

    image

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