修改

20200715/struct.go

@@ -0,0 +1,76 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+)
+
+type student struct {
+	name string
+	age  int
+}
+
+type Students struct {
+	ID     int 	  `json:"id"`
+	Gender string `json:"gender"`
+	Name   string `json:"name"`
+}
+
+type Class struct {
+	Title    string        `json:"title"`
+	Students []*Students   `json:"list"`
+}
+
+func main()  {
+	//m := make(map[string]*student)
+	//stus := []student{
+	//	{name: "小王子", age: 18},
+	//	{name: "娜扎", age: 23},
+	//	{name: "大王八", age: 9000},
+	//}
+	//
+	//for _, stu := range stus {
+	//	m[stu.name] = &stu
+	//}
+	//
+	///**
+	//娜扎 => 大王八
+	//大王八 => 大王八
+	//小王子 => 大王八
+	// */
+	//for k, v := range m {
+	//	fmt.Println(k, "=>", v.name)
+	//}
+
+	c := &Class{
+		Title:    "101",
+		Students: make([]*Students, 0, 200),
+	}
+	for i := 0; i < 10; i++ {
+		stu := &Students{
+			Name:   fmt.Sprintf("stu%02d", i),
+			Gender: "男",
+			ID:     i,
+		}
+		c.Students = append(c.Students, stu)
+	}
+
+	//JSON序列化：结构体-->JSON格式的字符串
+	data, err := json.Marshal(c)
+	if err != nil {
+		fmt.Println("json marshal failed")
+		return
+	}
+	fmt.Printf("json:%s\n", data)
+	//JSON反序列化：JSON格式的字符串-->结构体
+	str := `{"title":"101","list":[{"ID":0,"Gender":"男","Name":"stu00"},{"ID":1,"Gender":"男","Name":"stu01"},{"ID":2,"Gender":"男","Name":"stu02"},{"ID":3,"Gender":"男","Name":"stu03"},{"ID":4,"Gender":"男","Name":"stu04"},{"ID":5,"Gender":"男","Name":"stu05"},{"ID":6,"Gender":"男","Name":"stu06"},{"ID":7,"Gender":"男","Name":"stu07"},{"ID":8,"Gender":"男","Name":"stu08"},{"ID":9,"Gender":"男","Name":"stu09"}]}`
+	c1 := &Class{}
+	err = json.Unmarshal([]byte(str), c1)
+	if err != nil {
+		fmt.Println("json unmarshal failed!")
+		return
+	}
+	fmt.Printf("%#v\n", c1)
+}
+
+

time.go

@@ -0,0 +1,34 @@
+package main
+
+import (
+	"fmt"
+	"time"
+)
+
+func main() {
+	now := time.Now()
+	fmt.Println("current time:%v", now)
+	fmt.Println(now.Format("2006-01-02"))
+	fmt.Println(now.Format("2006/01/02 15:04:05"))
+	fmt.Println(now.Format("2006-01-02 15:04:05"))
+	fmt.Println(now.Year())
+	fmt.Println(now.Month())
+	fmt.Println(now.Day())
+	fmt.Println(now.Hour())
+	fmt.Println(now.Minute())
+	fmt.Println(now.Second())
+
+	fmt.Println(now.Unix())
+	fmt.Println(now.UnixNano())
+
+	fmt.Println(time.Unix(now.Unix(), 0))
+	fmt.Println(time.Unix(now.Unix(), 0).Format("2006-01-02 15:04:05"))
+
+	fmt.Println(now.Add(time.Hour))
+	fmt.Println(now.Add(time.Hour * 24))
+
+	now1 := time.Date(2020, time.April, 10, 9,10,11, 0, time.UTC)
+	fmt.Println(now.After(now1))
+	fmt.Println(now.Before(now1))
+	fmt.Println(now.Sub(now1))
+}