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题目要求：

题目
1.shape 接口有面积Area() float64和 周长Perimeter()fioat64 两个法。为`Circle` `Rectangle`实现`shape` 接口。
2.实现isGreater(shape1，shape2 shape)boo1 函数，用于比较两个形状的大小,并使用单元测试验证

3.实现http.Handler，作为HTTP服务比较Circle与 Rectangle 的大小。并使用香户端验证

请求示例:

curl --request POST \
--url http://localhost:8080/shape/isGreater \
--header 'content-type: application/json' \
--data '{"Shape1": {"Radius": 3}, "Shape2": {"Width": 2, "Height": 3}}'

代码

package mainimport ("encoding/json""fmt""log""net/http"
)const pi = 3.14type Shape interface {Area() float64Perimeter() float64
}type Circle struct {Radius float64
}type Rectangle struct {Height float64Width  float64
}func (c Circle) Area() float64 {return pi * c.Radius * c.Radius
}func (c Circle) Perimeter() float64 {return 2 * pi * c.Radius
}func (r Rectangle) Area() float64 {return r.Height * r.Width
}func (r Rectangle) Perimeter() float64 {return 2 * (r.Height + r.Width)
}func isGreater(s1, s2 Shape) bool {if s1.Area() > s2.Area() {fmt.Println("C1:%v is greater than C2:%v", s1, s2)return true}fmt.Println("C1:%v is less than C2:%v", s1, s2)return false
}type RequestData struct {Shape1 Circle    `json:"Shape1"`Shape2 Rectangle `json:"Shape2"`
}// CompareHandler 处理比较两个形状面积的HTTP请求
func CompareHandler(w http.ResponseWriter, r *http.Request) {var data RequestData// 从请求体中解码JSON数据到RequestData结构体中err := json.NewDecoder(r.Body).Decode(&data)if err != nil {// 如果解码失败，返回400 Bad Request错误http.Error(w, err.Error(), http.StatusBadRequest)return}// 比较两个形状的面积if isGreater(data.Shape1, data.Shape2) {// 如果圆形面积较大，返回 "Circle is larger"fmt.Fprintf(w, "Circle is larger")} else {// 否则，返回 "Rectangle is larger"fmt.Fprintf(w, "Rectangle is larger")}
}func main() {http.HandleFunc("/shape/isGreater", CompareHandler)log.Fatal(http.ListenAndServe(":8080", nil))
}

结果：