一、前言
使用了gorm操作数据库，后端基于gin框架，只是一个简单的注册和登录与数据库交互的后端实现例子。
二、目录结构
-templates
--regist.html
--login.html
-main.go
三、代码
regist.html
点击查看代码
<!DOCTYPE html>
<html>
<head>
<title>注册</title>
</head>
<body>
<h1>用户注册</h1>
<form action="/register" method="POST">
<label for="username">用户名:</label>
<input type="text" name="username" required><br><br>
<label for="password">密码:</label>
<input type="password" name="password" required><br><br>
<label for="email">邮箱:</label>
<input type="text" name="email" required><br><br>
<label for="age">年龄:</label>
<input type="text" name="age" required><br><br>
<button type="submit">注册</button>
</form>
<!-- 错误信息展示 -->
{{ if .error }}
<p style="color:red">{{ .error }}</p>
{{ end }}
</body>
</html>
login.html
点击查看代码
<!DOCTYPE html>
<html>
<head>
<title>登录</title>
</head>
<body>
<h1>用户登录</h1>
<form action="/login" method="POST">
<label for="username">用户名:</label>
<input type="text" name="username" required><br><br>
<label for="password">密码:</label>
<input type="password" name="password" required><br><br>
<button type="submit">登录</button>
</form>
<!-- 错误信息展示 -->
{{ if .error }}
<p style="color:red">{{ .error }}</p>
{{ end }}
<!-- 成功信息展示 -->
{{ if .success }}
<p style="color:red">{{ .success }}</p>
{{ end }}
</body>
</html>
main.go
点击查看代码
package main
import (
"log"
"net/http"
_ "github.com/go-sql-driver/mysql"
"github.com/gin-gonic/gin"
"github.com/jinzhu/gorm"
)
var db *gorm.DB
var err error
//定义数据表
type User struct {
gorm.Model
Username string `gorm:"unique" json:"username"`
Password string `json:"password"`
Age string `json:"age"`
Email string `json:"email"`
}
//连接数据库，使用gorm
func ConDB(){
dsn :="root:root@(127.0.0.1:3306)/mydb?charset=utf8mb4&parseTime=True&loc=Local"
db,err = gorm.Open("mysql",dsn)
if err!=nil{
log.Println(err)
}
//迁移数据表
db.AutoMigrate(&User{})
}
func main() {
//注册路由
r := gin.Default()
//连接数据库
ConDB()
//加载模版
r.LoadHTMLGlob("templates/*")
//注册路由，实现登录和注册,get获取页面，post提交数据
r.GET("/register",ShowRegisterPage)
r.POST("/register",Regist)
//登录
r.GET("/login",ShowLoginPage)
r.POST("/login",Login)
r.Run(":8080")
}
//注册页面
func ShowRegisterPage(c *gin.Context){
c.HTML(http.StatusOK,"regist.html",nil)
}
//注册提交
func Regist(c *gin.Context) {
//获取表单数据
username := c.PostForm("username")
password := c.PostForm("password")
age := c.PostForm("age")
email := c.PostForm("email")
//查询用户是否存在
user :=new(User) //初始化的user是默认id=0
db.Where("username = ?",username).First(user)
log.Println(*user)
if user.ID !=0 {
c.HTML(http.StatusCreated,"regist.html",gin.H{"error":"用户已存在"})
return
} else {
newuser := User{
Username: username,
Password: password,
Age: age,
Email: email,
}
db.Create(&newuser)
c.HTML(http.StatusOK,"login.html",gin.H{"success":"注册成功,请登录"})
}
}
//登录界面
func ShowLoginPage(c *gin.Context){
c.HTML(http.StatusOK,"login.html",nil)
}
//登录路由
func Login(c *gin.Context){
//获取数据
username := c.PostForm("username")
password := c.PostForm("password")
//查询用户并验证密码
var loginuser User
db.First(&loginuser,"username = ?",username)
if loginuser.ID ==0 {
c.HTML(http.StatusBadRequest,"login.html",gin.H{"error":"用户不存在！"})
return
}else {
// log.Panicln("first:-+++++>>>",loginuser)
// log.Panicln("find::->>>>>",loginuser)
if password == loginuser.Password {
c.JSON(http.StatusOK,"登录成功！")
} else {
c.HTML(http.StatusBadRequest,"login.html",gin.H{"error":"用户名或密码错误"})
}
}
}