Gin：学习记录

1. 简单的相应

请求：http://localhost:8082/hello

 返回：{"msg":"TEST"}

代码：

package main

import "github.com/gin-gonic/gin"

func main() {
  ginServer := gin.Default()

  ginServer.GET("/hello", func(context *gin.Context) {
    context.JSON(200, gin.H{"msg": "TEST"})
  })

  ginServer.Run(":8082")
}

2.带参的相应 

2.1传统

请求：http://localhost:8082/hello?username=wenlong&password=wenlong711

结果：{"password":"wenlong711","username":"wenlong"}

 代码：

package main

import (
	"github.com/gin-gonic/gin"
	"net/http"
)

func main() {
	ginServer := gin.Default()

	ginServer.GET("/hello", func(context *gin.Context) {
		username := context.Query("username")
		password := context.Query("password")
		context.JSON(http.StatusOK, gin.H{
			"username": username,
			"password": password,
		})
	})

	ginServer.Run(":8082")
}

2.2restful方式

请求：http://localhost:8082/hello/wenlong/wenlong711

 结果：{"password":"wenlong711","username":"wenlong"}

 代码：

package main

import (
	"github.com/gin-gonic/gin"
	"net/http"
)

func main() {
	ginServer := gin.Default()

	ginServer.GET("/hello/:username/:password", func(context *gin.Context) {
		username := context.Param("username")
		password := context.Param("password")
		context.JSON(http.StatusOK, gin.H{
			"username": username,
			"password": password,
		})
	})

	ginServer.Run(":8082")
}

接收JSON

post请求：http://localhost:8082/json

请求体{"password":"wenlong711","username":"wenlong"}

结果：{"password":"wenlong711","username":"wenlong"}

代码 

package main

import (
	"encoding/json"
	"github.com/gin-gonic/gin"
	"net/http"
)

func main() {
	ginServer := gin.Default()

	ginServer.POST("/json", func(context *gin.Context) {
		data,_:=context.GetRawData()
		var m map[string]interface{}
		_ = json.Unmarshal(data,&m)
		context.JSON(http.StatusOK,m)
	})

	ginServer.Run(":8082")
}

3.数据库操作

package main

import (
	"database/sql"
	"fmt"
	"github.com/gin-gonic/gin"
	_ "github.com/go-sql-driver/mysql"
	"log"
	"net/http"
)

// https://segmentfault.com/a/1190000020411917
type Express struct {
	Id           int    `json:"id"`
	Name         string `json:"name"`
	Phone        string `json:"phone"`
	Address      string `json:"address"`
	Subject      string `json:"subject"`
	Mail         string `json:"mail"`
	Date         string `json:"date"`
	SingleNumber string `json:"single_number"`
}

// 定义一个getALL函数用于回去全部的信息
func getAll(area string) (_express []Express, err error) {
	//1.连接数据库
	db, err := sql.Open("mysql", "nufe:yWpRE2i3JzfnERcY@(127.0.0.1:3306)/nufe?charset=utf8")
	if err != nil {
		panic(err)
	}
	defer db.Close()
	if err := db.Ping(); err != nil {
		fmt.Println("连接失败")
		panic(err)
		//return db
	}
	fmt.Println("连接成功")
	//2.查询
	rows, err := db.Query("SELECT * FROM express2021_09_27 where address like ?;", "%"+area+"%")
	if err != nil {
		log.Fatal(err.Error())
	}

	for rows.Next() {
		var express Express
		//遍历表中所有行的信息
		rows.Scan(&express.Id, &express.Name, &express.Phone, &express.Address, &express.Subject, &express.Mail, &express.Date, &express.SingleNumber)
		//将express添加到_express中
		_express = append(_express, express)
	}
	//最后关闭连接
	defer rows.Close()
	return
}

func main() {
	SetupServer().Run(":8082")
}

func SetupServer() *gin.Engine {
	r := gin.Default()
	r.GET("/list/:area", listHandler)
	return r
}

func listHandler(context *gin.Context) {
	area := context.Param("area")
	_express, err := getAll(area)
	if err != nil {
		log.Fatal(err)
	}
	context.JSON(http.StatusOK, gin.H{
		"message": _express,
	})
}

4.简单的对象封装demo

package main

import "fmt"

type Hero struct {
	Name  string
	Ad    int
	Level int
}

func (this *Hero) GetName() string {
	return this.Name
}
func (this *Hero) Show() {
	fmt.Println("Name = ", this.Name)
	fmt.Println("Ad = ", this.Ad)
	fmt.Println("Level = ", this.Level)
}

func (this *Hero) SetName(newName string) {
	this.Name = newName
}

func main() {
	hero := Hero{Name: "zhang3", Ad: 100, Level: 1}
	hero.Show()

	hero.SetName("li4")
	hero.Show()
}

import的使用

//hello.go
package hello

import (
  "fmt"
)

func SayHello() {
  fmt.Println("SayHello()-->Hello")
}

//main.go
package main

import (
  "hello"
)

func main() {
  hello.SayHello()
}

结构体的使用

package main

import (
	"fmt"
)

type Hero struct {
	Name  string
	Ad    int
	Level int
}

func (this *Hero) GetName() string {
	return this.Name
}
func (this *Hero) Show() {
	fmt.Println("Name = ", this.Name)
	fmt.Println("Ad = ", this.Ad)
	fmt.Println("Level = ", this.Level)
}

func (this *Hero) SetName(newName string) {
	this.Name = newName
}

func main() {
	hero := Hero{Name: "zhang3", Ad: 100, Level: 1}
	hero.Show()

	hero.SetName("li4")
	hero.Show()

}