使用springboot开发优惠券的代码

好的，以下是一个简单的使用Spring Boot开发优惠券的代码示例：

1. 创建一个Spring Boot项目

2. 添加依赖

在`pom.xml`文件中添加以下依赖：

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-mongodb</artifactId>
    </dependency>
</dependencies>

3. 创建一个 Coupon 实体类

import java.util.Date;

public class Coupon {
    private String id;
    private String name;
    private Date startDate;
    private Date endDate;
    private double discount;

    // getters and setters
}

4. 创建一个 CouponRepository 接口

import org.springframework.data.mongodb.repository.MongoRepository;

public interface CouponRepository extends MongoRepository<Coupon, String> {
    Coupon findByName(String name);
}

5. 创建一个 CouponController 控制器

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;

@RestController
@RequestMapping("/coupons")
public class CouponController {
    @Autowired
    private CouponRepository couponRepository;

    @RequestMapping(value = "", method = RequestMethod.POST)
    public ResponseEntity<Coupon> createCoupon(@RequestBody Coupon coupon) {
        couponRepository.save(coupon);
        return new ResponseEntity<Coupon>(coupon, HttpStatus.CREATED);
    }

    @RequestMapping(value = "/{name}", method = RequestMethod.GET)
    public ResponseEntity<Coupon> getCouponByName(@PathVariable("name") String name) {
        Coupon coupon = couponRepository.findByName(name);
        if (coupon == null) {
            return new ResponseEntity<Coupon>(HttpStatus.NOT_FOUND);
        }
        return new ResponseEntity<Coupon>(coupon, HttpStatus.OK);
    }
}

6. 配置 MongoDB

在`application.properties`文件中添加以下配置：

spring.data.mongodb.host=localhost
spring.data.mongodb.port=27017
spring.data.mongodb.database=coupons

7. 运行应用程序

运行`CouponApplication.java`文件，应用程序将在端口8080上启动。

现在，您可以使用Postman或其他REST客户端测试API，例如：

- 创建一个新优惠券：

`POST http://localhost:8080/coupons`

请求体：

  {
      "name": "10% off",
      "startDate": "2022-01-01",
      "endDate": "2022-12-31",
      "discount": 0.1
  }

- 按名称检索优惠券：

`GET http://localhost:8080/coupons/10%25%20off`

响应体：

  {
      "id": "61e6a4f8e1f20b7dcf7d3f91",
      "name": "10% off",
      "startDate": "2022-01-01T00:00:00.000+00:00",
      "endDate": "2022-12-31T00:00:00.000+00:00",
      "discount": 0.1
  }