feature:支持使用配置文件，增加网络检查

1、从Config.json读取配置
2、网络正常时跳过登录

Util/config.go

@@ -0,0 +1,62 @@
+package Util
+
+import (
+	"Mmx/Modles"
+	"fmt"
+	"os"
+)
+
+type config struct {
+	Path string
+}
+
+var Config = config{
+	Path: "Config.json",
+}
+
+func (*config) Generate(Form *Modles.LoginForm, Meta *Modles.LoginMeta) *Modles.LoginInfo {
+	return &Modles.LoginInfo{
+		UrlLoginPage:       "http://" + Form.Domain + "/srun_portal_success",
+		UrlGetChallengeApi: "http://" + Form.Domain + "/cgi-bin/get_challenge",
+		UrlLoginApi:        "http://" + Form.Domain + "/cgi-bin/srun_portal",
+		Meta:               Meta,
+		Form: &Modles.LoginForm{
+			UserName: Form.UserName + "@cmcc",
+			PassWord: Form.PassWord,
+		},
+	}
+}
+
+func (a *config) Init() *Modles.LoginInfo {
+	if !File.Exists(a.Path) {
+		if err := File.Write(a.Path, &Modles.Config{ //默认值
+			From: Modles.LoginForm{
+				Domain:   "www.msftconnecttest.com",
+				UserName: "",
+				PassWord: "",
+			},
+			Meta: Modles.LoginMeta{
+				N:     "200",
+				VType: "1",
+				Acid:  "5",
+				Enc:   "srun_bx1",
+			},
+		}); err != nil {
+			fmt.Println("Create 'Config.json' error:\n", err.Error())
+			os.Exit(3)
+		}
+		fmt.Println("Please edit 'Config.json' and try again.")
+		os.Exit(1)
+	}
+
+	var c Modles.Config
+	if err := File.Read(a.Path, &c); err != nil {
+		fmt.Println("Read config failed:\n", err.Error())
+		os.Exit(3)
+	}
+
+	return a.Generate(
+		&c.From,
+		&c.Meta,
+	)
+}