Golang 入门系列（十一）Go语言实现webapi
之前，已经讲过很多Golang的东西，比如基础语法，mysql的使用，redis的使用等等，感兴趣的可以看看以前的文章，https://www.cnblogs.com/zhangweizhong/category/1275863.html，
今天就用从头写一个完整的go的示例项目吧。
本项目完全使用原生开发，没有使用任何WEB框架和ORM。虽然大家对mvc 呀，三层架构已经很了解了。但是，我还是想从头写一个完整的示例项目。这样大家有一个更深刻的了解，这样以后介绍web框架，orm框架的时候，学习起来应该会简单一点。
项目架构
下图这种架构模式相信大家应该十分清楚
Controller组合封装
Controller"基类"封装
package framework
type Controller struct {
Data interface{}
}
UserController定义了用户注册，登录和查询等简单的三个接口
package controller
import (
"net/http"
"micro-cloud/service"
"micro-cloud/utils"
"micro-cloud/framework"
)
/**
* r.PostFormValue : 可以解析 Post/PUT Content-Type=application/x-www-form-urlencoded 或 Content-Type=multipart/form-data
*/
type UserConterller struct {
}
var userService = new(service.UserService)
func (p *UserConterller) Router(router *framework.RouterHandler) {
router.Router("/register", p.register)
router.Router("/login", p.login)
router.Router("/findAll", p.findAll)
}
//POST Content-Type=application/x-www-form-urlencoded
func (p *UserConterller) register(w http.ResponseWriter, r *http.Request) {
username := r.PostFormValue("username")
password := r.PostFormValue("password")
if utils.Empty(username) || utils.Empty(password) {
microcloud.ResultFail(w, "username or password can not be empty")
return
}
id := userService.Insert(username, password)
if id <= 0 {
microcloud.ResultFail(w, "register fail")
return
}
microcloud.ResultOk(w, "register success")
}
//POST Content-Type=application/x-www-form-urlencoded
func (p *UserConterller) login(w http.ResponseWriter, r *http.Request) {
username := r.PostFormValue("username")
password := r.PostFormValue("password")
if utils.Empty(username) || utils.Empty(password) {
microcloud.ResultFail(w, "username or password can not be empty")
return
}
users := userService.SelectUserByName(username)
if len(users) == 0 {
microcloud.ResultFail(w, "user does not exist")
return
}
if users[0].Password != password {
microcloud.ResultFail(w, "password error")
return
}
microcloud.ResultOk(w, "login success")
}
// GET/POST
func (p *UserConterller) findAll(w http.ResponseWriter, r *http.Request) {
users := userService.SelectAllUser()
framework.ResultJsonOk(w, users)
}
数据访问层
package dao import ( "micro-cloud/model" "fmt" ) type UserDao struct { } func (p *UserDao) Insert(user *model.User) int64 { result, err := framework.DB.Exec("INSERT INTO user(`username`,`password`,`create_time`) value(?,?,?)", user.Username, user.Password, user.CreateTime) if err != nil { fmt.Println("Insert error") return 0 } id, err := result.LastInsertId() if err != nil { fmt.Println("Insert error") return 0 } return id } func (p *UserDao) SelectUserByName(username string) []model.User { rows, err := framework.DB.Query("SELECT * FROM user WHERE username = ?", username) if err != nil { fmt.Println("selectuserbyname error") return nil } var users []model.User for rows.Next() { var user model.User err := rows.Scan(&user.ID, &user.Username, &user.Password, &user.CreateTime) if err != nil { fmt.Println("selectuserbyname error") continue } users = append(users, user) } rows.Close() return users } func (p *UserDao) SelectAllUser() []model.User { rows, err := framework.DB.Query("SELECT * FROM user") if err != nil { fmt.Println("SelectAllUser error") return nil } var users []model.User for rows.Next() { var user model.User err := rows.Scan(&user.ID, &user.Username, &user.Password, &user.CreateTime) if err != nil { fmt.Println("SelectAllUser error") continue } users = append(users, user) } rows.Close() return users }
实体层
package model import "time" type User struct { ID uint `json:"id"` Username string `json:"username"` Password string `json:"-"` CreateTime time.Time `json:"create_time"` }
database
数据库操作类的实现
package microcloud
import (
"database/sql"
"log"
"strings"
_ "github.com/go-sql-driver/mysql"
)
//数据库的配置
const (
username = "admin"
password = "123456" ip = "10.2.1.5" port = "3306" dbName = "microcloud" driverName = "mysql" ) //DB数据库连接池 var DB *sql.DB func InitDB() { //构建连接："用户名:密码@tcp(IP:端口)/数据库?charset=uft8" //注意：要想解析time.Time类型，必须要设置parseTime=True path := strings.Join([]string{username, ":", password, "@tcp(", ip, ":", port, ")/", dbName, "?charset=utf8&parseTime=True&loc=Local"}, "") //打开数据库，前者是驱动名，所以要导入:_"github.com/go-sql-driver/mysql" DB, _ = sql.Open(driverName, path) //设置数据库最大连接数 DB.SetConnMaxLifetime(100) //设置数据库最大闲置连接数 DB.SetMaxIdleConns(10) //验证连接 if err := DB.Ping(); err != nil { log.Panic(err) } log.Println("database connect success") } func CreateTable() { userTable := "CREATE TABLE IF NOT EXISTS `user`(" + "`id` INT UNSIGNED AUTO_INCREMENT," + "`username` VARCHAR(20) NOT NULL," + "`password` VARCHAR(40) NOT NULL," + "`create_time` DATETIME," + "PRIMARY KEY ( `id` )" + ")ENGINE=InnoDB DEFAULT CHARSET=utf8;" _, err := DB.Exec(userTable) if err != nil { log.Panic(err) } }
http
http server的实现
server := &http.Server{ Addr: ":8215", Handler: microcloud.Router, ReadTimeout: 5 * time.Second, } RegiterRouter(microcloud.Router) err := server.ListenAndServe() if err != nil { log.Panic(err) }
Router
路由处理的实现，其实也就是一个转发的功能
type RouterHandler struct { } var mux = make(map[string]func(http.ResponseWriter,*http.Request)) func (p *RouterHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) { fmt.Println(r.URL.Path) if fun, ok := mux[r.URL.Path]; ok { fun(w, r) return } //静态资源 if strings.HasPrefix(r.URL.Path,constant.STATIC_BAES_PATH){ if fun, ok := mux[constant.STATIC_BAES_PATH]; ok { fun(w, r) return } } http.Error(w, "error URL:"+r.URL.String(), http.StatusBadRequest) } func (p *RouterHandler) Router(relativePath string, handler func(http.ResponseWriter, *http.Request)) { mux[relativePath] = handler }
演示
执行 go run main.go 之后，打开Postman，调相关的接口
以下就是访问API的请求与响应
/findAll 接口
/register 接口
posted @
2019-04-19 20:06 章为忠 阅读(
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