Gin基础：路由
Gin基础：路由
一、Hello world
package main
import (
"github.com/gin-gonic/gin"
"net/http"
)
func main() {
r := gin.Default()
r.GET("/", func(c *gin.Context) {
c.String(http.StatusOK, "Hello World")
})
r.Run() // 监听并在 0.0.0.0:8080 上启动服务
}
二、注册
（一）路由注册
package main
import (
"github.com/gin-gonic/gin"
"net/http"
)
func main() {
r := gin.Default()
r.GET("/", func(c *gin.Context) {
c.String(http.StatusOK, "Hello World")
})
r.GET("/get", func(c *gin.Context) {
c.String(http.StatusOK, "this is get")
})
r.POST("/post", func(c *gin.Context) {
c.JSON(http.StatusOK, gin.H{
"msg": "this is post",
})
})
r.Run() // 监听并在 0.0.0.0:8080 上启动服务
}
（二）路由分层
package main
import (
"github.com/gin-gonic/gin"
"net/http"
)
func main() {
r := gin.Default()
userGroup := r.Group("/user")
// 注册路由/user/login
userGroup.POST("/login", func(c *gin.Context) {
c.String(http.StatusOK, "this /user/login")
})
// 注册跌幅/user/logout
userGroup.GET("/logout", func(c *gin.Context) {
c.String(http.StatusOK, "this /user/logout")
})
r.Run() // 监听并在 0.0.0.0:8080 上启动服务
}
三、参数解析
（一）路由匹配
package main
import (
"fmt"
"github.com/gin-gonic/gin"
"net/http"
)
func main() {
r := gin.Default()
r.GET("/news/:id", func(c *gin.Context) {
id := c.Param("id")
fmt.Println(id)
c.String(http.StatusOK, "OK")
})
r.Run() // 监听并在 0.0.0.0:8080 上启动服务
}
GoLand HTTP Client工具：
GET http://localhost:8080/news/1
Accept: */*
执行结果
GET http://localhost:8080/news/1
HTTP/1.1 200 OK
Content-Type: text/plain; charset=utf-8
Date: Tue, 14 Jul 2020 07:24:23 GMT
Content-Length: 2
OK
Response code: 200 (OK); Time: 17ms; Content length: 2 bytes
（二）获取路由参数
package main
import (
"github.com/gin-gonic/gin"
"net/http"
)
func main() {
r := gin.Default()
r.GET("/news", func(c *gin.Context) {
// 带默认值,如果不存在该参数使用设置的默认值
//page := c.DefaultQuery("page", "1")
// 不带默认值，如果不存在该参数使用类型默认值
page := c.Query("page")
c.String(http.StatusOK, page)
})
r.Run() // 监听并在 0.0.0.0:8080 上启动服务
}
GoLand HTTP Client工具：
GET http://localhost:8080/news?page=1
Accept: */*
执行结果：
GET http://localhost:8080/news?page=1
HTTP/1.1 200 OK
Content-Type: text/plain; charset=utf-8
Date: Tue, 14 Jul 2020 07:37:39 GMT
Content-Length: 1
1
（三）post参数
1.urlencoded
package main
import (
"github.com/gin-gonic/gin"
"net/http"
)
func main() {
r := gin.Default()
r.POST("/news/delete", func(c *gin.Context) {
// 带默认值,如果不存在该参数使用设置的默认值
//id := c.DefaultPostForm("id", "1")
// 不带默认值，如果不存在该参数使用类型默认值
id := c.PostForm("id")
c.String(http.StatusOK, id)
})
r.Run() // 监听并在 0.0.0.0:8080 上启动服务
}
GoLand HTTP Client工具：
POST http://localhost:8080/news/delete
Accept: */*
Content-Type: application/x-www-form-urlencoded
id=1
执行结果：
POST http://localhost:8080/news/delete
HTTP/1.1 200 OK
Content-Type: text/plain; charset=utf-8
Date: Tue, 14 Jul 2020 07:48:18 GMT
Content-Length: 1
1
2.json
package main
import (
"encoding/json"
"github.com/gin-gonic/gin"
"io/ioutil"
"net/http"
"strconv"
)
func main() {
r := gin.Default()
r.POST("/news/delete", func(c *gin.Context) {
// 获取请求body
data, err := ioutil.ReadAll(c.Request.Body)
if err != nil {
panic(err)
}
// 请求body解析成结构体
temp := struct {
Id int `json:"id"`
}{}
err = json.Unmarshal(data, &temp)
if err != nil {
panic(err)
}
c.String(http.StatusOK, "id=" + strconv.Itoa(temp.Id))
})
r.Run() // 监听并在 0.0.0.0:8080 上启动服务
}
GoLand HTTP Client工具：
POST http://localhost:8080/news/delete
Accept: */*
Content-Type: application/json
{
"id": 1
}
执行结果：
POST http://localhost:8080/news/delete
HTTP/1.1 200 OK
Content-Type: text/plain; charset=utf-8
Date: Tue, 14 Jul 2020 08:08:05 GMT
Content-Length: 4
id=1
（四）参考
- Gin Web Framework
- Gin框架入门(一)—HTTP请求