彩虹女神跃长空,Go语言进阶之Go语言高性能Web框架Iris项目实战-用户系统EP03
前文再续，之前一篇我们已经配置好了数据库以及模板引擎，现在可以在逻辑层编写具体业务代码了，博客平台和大多数在线平台一样，都是基于用户账号体系来进行操作，所以我们需要针对用户表完成用户账号的CURD操作。
用户后台模板
首先用户操作逻辑主要在后台展现，所以模板应该单独生成admin文件夹，和前台模板进行逻辑隔离：
cd views
mkdir admin
随后创建用户管理页面模板user.html:
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="applicable-device" content="pc,mobile" />
<title>用户管理</title>
<meta content="index,follow" name="robots">
<meta content="index,follow" name="GOOGLEBOT">
<meta content="刘悦" name="Author">
<meta http-equiv="expires" content="4500"/>
<link rel="stylesheet" href="../assets/css/style.css" />
<script src="../assets/js/axios.js"></script>
<script src="../assets/js/vue.js"></script>
</head>
<body >
<div id="app">
<nav class="navbar navbar-inverse navbar-fixed-top">
<div class="container">
<div class="navbar-header">
<div class="switch_a nav_swich">
<div class="react-toggle">
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<div class="search navbar-right" >
<form action="/Index_search" method ="GET" class="search_form" >
<input type="search" name="text" class="search_input" placeholder="Search" required="required" >
</form>
</div>
</div>
</div>
</nav>
<div class="container">
<header>
</header>
<section>
<div class="row">
<div class="col-md-8">
<ul class="g-formlist form_li">
<li>
<label class="mark">用户名</label>
<div class="write">
<input type="text" id="form-name" class="g-text-entry" placeholder="请输入4-10字符" />
<span class="tip" data-initial="请输入4-10字符"></span>
</div>
</li>
<li>
<label class="mark">密 码</label>
<div class="write">
<input type="password" id="form-psw" class="g-text-entry" placeholder="请输入6-30字符" />
<span class="tip" data-initial="请输入6-30字符"></span>
</div>
</li>
</ul>
<button>提交</button>
</div>
</div>
</section>
</div>
</div>
</body>
模板目录架构如下：
└── views
├── admin
│ └── user.html
├── index.html
└── test.html
views根目录模板为前台模板，而admin目录下模板是为后台模板。
同时前端声明username和password变量，分别绑定用户名和密码：
const App = {
data() {
return {
//用户名
username: "",
//密码
password:""
};
},
created: function() {
console.log("你好，女神");
},
methods: {
},
};
接着构造用户添加表单，绑定表单字段：
<ul class="g-formlist form_li">
<li>
<label class="mark">用户名</label>
<div class="write">
<input v-model="username" type="text" id="form-name" class="g-text-entry" placeholder="请输入4-10字符" />
<span class="tip" data-initial="请输入4-10字符"></span>
</div>
</li>
<li>
<label class="mark">密 码</label>
<div class="write">
<input v-model="password" type="password" id="form-psw" class="g-text-entry" placeholder="请输入6-30字符" />
<span class="tip" data-initial="请输入6-30字符"></span>
</div>
</li>
</ul>
<button @click="submit">提交</button>
这里通过v-model关键字将表单和变量做双向绑定，同时为按钮绑定submit提交方法。
如果愿意，我们也可以针对前端的axios库进行二次封装，增加异步请求方法的复用性：
const myaxios = function (url, type, data = {}) {
return new
Promise((resolve) => {
if (type === "get" || type === "delete") {
axios({
method: type,
url: url,
params: data
}).then((result) => {
resolve(result.data);
});
} else {
const params = new URLSearchParams();
for (var key in data) {
params.append(key,data[key]);
}
axios({
method: type,
url: url,
data:params
}).then((result) => {
resolve(result.data);
});
}
});
}
app.config.globalProperties.myaxios = myaxios;
这样，我们就可以随时使用this关键字来向后台发起异步请求了。
接着，编写后台视图，将用户后台模板渲染出来：
app.Get("/admin/user/", func(ctx iris.Context) {
ctx.View("/admin/user.html")
})
编译后，访问 http://localhost:5000/admin/user/，如图所示：
用户后台接口
后台接口主要负责接收前端请求的参数，然后根据请求方式类型来决定用户表的操作动作，首先构建添加接口：
app.Post("/admin/user_action/", func(ctx iris.Context) {
username := ctx.PostValue("username")
password := ctx.PostValue("password")
fmt.Println(username, password)
ret := map[string]string{
"errcode": "0",
"msg": "ok",
}
ctx.JSON(ret)
})
这里使用Post方式匹配路由/admin/user_action/，随后通过ctx结构体的PostValue函数来获取具体的参数key，然后利用ctx.JSON函数将字典序列化为Json，再返回给前端。
前端则使用之前封装好的myaxios内置方法向后端发起异步请求：
submit:function(){
this.myaxios("http://localhost:5000/admin/user_action/","post",{"username":this.username,"password":this.password}).then(data => {
console.log(data)
});
}
后台返回：
Now listening on: http://localhost:5000
Application started. Press CTRL+C to shut down.
19:30:58 app | admin admin
可以看到，后端打印出了前端请求的用户名和密码，接着就是入库操作：
app.Post("/admin/user_action/", func(ctx iris.Context) {
username := ctx.PostValue("username")
password := ctx.PostValue("password")
fmt.Println(username, password)
user := &model.User{Username: username, Password: password}
res := db.Create(user)
fmt.Println(res.Error)
ret := map[string]string{
"errcode": "0",
"msg": "ok",
}
ctx.JSON(ret)
})
这里初始化结构体变量user后，利用db.Create函数进行入库操作。
随后检查入库结果：
MySQL [irisblog]> select * from user;
+----+---------------------+---------------------+------------+----------+----------+
| id | created_at | updated_at | deleted_at | username | password |
+----+---------------------+---------------------+------------+----------+----------+
| 13 | 2022-08-22 19:33:16 | 2022-08-22 19:33:16 | NULL | admin | admin |
+----+---------------------+---------------------+------------+----------+----------+
1 row in set (0.00 sec)
入库操作虽然成功了，但显然，密码不能使用明文，否则不就步CSDN的后尘贻笑大方了吗？
添加md5加密逻辑：
w := md5.New()
io.WriteString(w, password) //将str写入到w中
md5str := fmt.Sprintf("%x", w.Sum(nil))
注意导入"crypto/md5"和"io"两个标准库包。
完成代码：
app.Post("/admin/user_action/", func(ctx iris.Context) {
username := ctx.PostValue("username")
password := ctx.PostValue("password")
fmt.Println(username, password)
w := md5.New()
io.WriteString(w, password) //将str写入到w中
md5str := fmt.Sprintf("%x", w.Sum(nil))
user := &model.User{Username: username, Password: md5str}
res := db.Create(user)
fmt.Println(res.Error)
ret := map[string]string{
"errcode": "0",
"msg": "ok",
}
ctx.JSON(ret)
})
重新编译后，再次发起请求，检查入库结果：
MySQL [irisblog]> select * from user;
+----+---------------------+---------------------+------------+----------+----------------------------------+
| id | created_at | updated_at | deleted_at | username | password |
+----+---------------------+---------------------+------------+----------+----------------------------------+
| 16 | 2022-08-22 19:41:40 | 2022-08-22 19:41:40 | NULL | admin | 21232f297a57a5a743894a0e4a801fc3 |
+----+---------------------+---------------------+------------+----------+----------------------------------+
1 row in set (0.00 sec)
完成添加逻辑后，可以将用户列表批量查询出来：
app.Get("/admin/userlist/", func(ctx iris.Context) {
var users []model.User
res := db.Find(&users)
ctx.JSON(res)
})
注意这里声明一个切片嵌套结构users，切片的每一个元素是用户结构体，接口返回：
{
Value: [
{
ID: 16,
CreatedAt: "2022-08-22T19:41:40+08:00",
UpdatedAt: "2022-08-22T19:41:40+08:00",
DeletedAt: null,
Username: "admin",
Password: "21232f297a57a5a743894a0e4a801fc3"
},
{
ID: 17,
CreatedAt: "2022-08-22T19:48:25+08:00",
UpdatedAt: "2022-08-22T19:48:25+08:00",
DeletedAt: null,
Username: "888123",
Password: "202cb962ac59075b964b07152d234b70"
},
{
ID: 18,
CreatedAt: "2022-08-22T19:48:28+08:00",
UpdatedAt: "2022-08-22T19:48:28+08:00",
DeletedAt: null,
Username: "admin123",
Password: "21232f297a57a5a743894a0e4a801fc3"
}
],
Error: null,
RowsAffected: 3
}
随后，前端可以通过异步请求回调赋值将用户列表展示在页面中：
const App = {
data() {
return {
//用户名
username: "",
//密码
password:"",
//用户列表
userlist:[]
};
},
created: function() {
console.log("你好，女神");
this.get_userlist();
},
methods: {
get_userlist:function(){
this.myaxios("http://localhost:5000/admin/userlist/","get",).then(data => {
console.log(data)
this.userlist = data.Value
});
},
submit:function(){
this.myaxios("http://localhost:5000/admin/user_action/","post",{"username":this.username,"password":this.password}).then(data => {
console.log(data)
});
}
},
};
随后，在页面中渲染userlist变量：
<table class="gridtable">
<tr>
<th>用户id</th>
<th>用户名</th>
<th>添加时间</th>
</tr>
<tr v-for="(item,index) in userlist">
<td>{{ item.ID }}</td>
<td>{{ item.Username }}</td>
<td>{{ item.CreatedAt }}</td>
</tr>
</table>
请求 http://localhost:5000/admin/user/ 如图所示：
Vue.js+Iris的前后端联调流程就跑通了，当然有些地方还需要封装，比如md5加密环节，后续登录模块也依然会依赖md5包，项目根目录下建立mytool目录：
mkdir mytool
cd mytool
将md5加密封装为函数：
package mytool
import (
"crypto/md5"
"fmt"
"io"
)
func Make_password(password string) string {
w := md5.New()
io.WriteString(w, password) //将str写入到w中
md5str := fmt.Sprintf("%x", w.Sum(nil))
return md5str
}
随后通过包名进行调用：
md5str := mytool.Make_password(password)
结语
至此，前后端分离的用户系统就构建好了，开发效率层面，基于Go lang的Iris框架并不逊色于任何动态语言框架，语法的简明程度有过之而无不及，性能层面更是不遑多让，该项目已开源在Github：https://github.com/zcxey2911/IrisBlog ，与君共觞，和君共勉。
