添加下载功能

.vscode/launch.json

@@ -0,0 +1,16 @@
+{
+    // 使用 IntelliSense 了解相关属性。 
+    // 悬停以查看现有属性的描述。
+    // 欲了解更多信息，请访问: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Launch Package",
+            "type": "go",
+            "request": "launch",
+            "mode": "auto",
+            "program": "${fileDirname}",
+            "args": [ "18" ]
+        }
+    ]
+}

cli/cli.go

@@ -25,12 +25,15 @@ var (
 )
 
 func init() {
-	/* ghomeDir, _ = os.Getwd()
+	ghomeDir, _ = os.Getwd()
-	goroot = filepath.Join(ghomeDir, "go")
+	fmt.Println(ghomeDir)
+	goroot = filepath.Join(ghomeDir, "java")
+	fmt.Println(goroot)
 	downloadsDir = filepath.Join(ghomeDir, "downloads")
 	os.MkdirAll(downloadsDir, 0755)
 	versionsDir = filepath.Join(ghomeDir, "versions")
-	os.MkdirAll(versionsDir, 0755) */
+	os.MkdirAll(versionsDir, 0755)
+
 	cli.AppHelpTemplate = fmt.Sprintf(`NAME:
 	{{.Name}}{{if .Usage}} - {{.Usage}}{{end}}
 

cli/install.go

@@ -0,0 +1,57 @@
+package cli
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/forget-the-bright/j/internal/pkg/config"
+	"github.com/forget-the-bright/j/internal/pkg/download"
+	"github.com/mholt/archiver/v3"
+	"github.com/urfave/cli/v2"
+)
+
+func fundVersion(version string) *config.UrlItem {
+	for _, v := range config.Url_Items {
+		if strings.Contains(v.Expected, version) {
+			return v
+		}
+	}
+	return nil
+}
+
+func Install(version string) (err error) {
+	ui := fundVersion(version)
+	if ui == nil {
+		return nil
+	}
+
+	filename := filepath.Join(downloadsDir, ui.In.FileName)
+	DownloadWithProgress(ui.In.URL, filename)
+	targetV := filepath.Join(versionsDir, ui.SimpleName)
+
+	// 解压安装包
+	if err = archiver.Unarchive(filename, versionsDir); err != nil {
+		fmt.Println(err.Error())
+		return cli.Exit(errstring(err), 1)
+	}
+	// 目录重命名
+	if err = os.Rename(filepath.Join(versionsDir, ui.Expected), targetV); err != nil {
+		fmt.Println(err.Error())
+		return cli.Exit(errstring(err), 1)
+	}
+	// 重新建立软链接
+	_ = os.Remove(goroot)
+
+	if err = mkSymlink(targetV, goroot); err != nil {
+		return cli.Exit(errstring(err), 1)
+	}
+	fmt.Printf("Now using %s\n", ui.Expected)
+	return nil
+}
+
+// DownloadWithProgress 下载版本另存为指定文件且显示下载进度
+func DownloadWithProgress(url, dst string) (size int64, err error) {
+	return download.Download(url, dst, os.O_CREATE|os.O_WRONLY, 0644, true)
+}

go.mod

@@ -6,14 +6,30 @@ require (
 	github.com/Masterminds/semver v1.5.0
 	github.com/fatih/color v1.15.0
 	github.com/k0kubun/go-ansi v0.0.0-20180517002512-3bf9e2903213
+	github.com/mholt/archiver/v3 v3.5.1
+	github.com/schollz/progressbar/v3 v3.13.1
 	github.com/urfave/cli/v2 v2.25.0
 )
 
 require (
+	github.com/andybalholm/brotli v1.0.1 // indirect
 	github.com/cpuguy83/go-md2man/v2 v2.0.2 // indirect
+	github.com/dsnet/compress v0.0.2-0.20210315054119-f66993602bf5 // indirect
+	github.com/golang/snappy v0.0.2 // indirect
+	github.com/klauspost/compress v1.11.4 // indirect
+	github.com/klauspost/pgzip v1.2.5 // indirect
 	github.com/mattn/go-colorable v0.1.13 // indirect
 	github.com/mattn/go-isatty v0.0.17 // indirect
+	github.com/mattn/go-runewidth v0.0.14 // indirect
+	github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db // indirect
+	github.com/nwaples/rardecode v1.1.0 // indirect
+	github.com/pierrec/lz4/v4 v4.1.2 // indirect
+	github.com/rivo/uniseg v0.4.3 // indirect
 	github.com/russross/blackfriday/v2 v2.1.0 // indirect
+	github.com/stretchr/testify v1.8.0 // indirect
+	github.com/ulikunitz/xz v0.5.9 // indirect
+	github.com/xi2/xz v0.0.0-20171230120015-48954b6210f8 // indirect
 	github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673 // indirect
 	golang.org/x/sys v0.6.0 // indirect
+	golang.org/x/term v0.6.0 // indirect
 )

go.sum

@@ -1,22 +1,74 @@
 github.com/Masterminds/semver v1.5.0 h1:H65muMkzWKEuNDnfl9d70GUjFniHKHRbFPGBuZ3QEww=
 github.com/Masterminds/semver v1.5.0/go.mod h1:MB6lktGJrhw8PrUyiEoblNEGEQ+RzHPF078ddwwvV3Y=
+github.com/andybalholm/brotli v1.0.1 h1:KqhlKozYbRtJvsPrrEeXcO+N2l6NYT5A2QAFmSULpEc=
+github.com/andybalholm/brotli v1.0.1/go.mod h1:loMXtMfwqflxFJPmdbJO0a3KNoPuLBgiu3qAvBg8x/Y=
 github.com/cpuguy83/go-md2man/v2 v2.0.2 h1:p1EgwI/C7NhT0JmVkwCD2ZBK8j4aeHQX2pMHHBfMQ6w=
 github.com/cpuguy83/go-md2man/v2 v2.0.2/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/dsnet/compress v0.0.2-0.20210315054119-f66993602bf5 h1:iFaUwBSo5Svw6L7HYpRu/0lE3e0BaElwnNO1qkNQxBY=
+github.com/dsnet/compress v0.0.2-0.20210315054119-f66993602bf5/go.mod h1:qssHWj60/X5sZFNxpG4HBPDHVqxNm4DfnCKgrbZOT+s=
+github.com/dsnet/golib v0.0.0-20171103203638-1ea166775780/go.mod h1:Lj+Z9rebOhdfkVLjJ8T6VcRQv3SXugXy999NBtR9aFY=
 github.com/fatih/color v1.15.0 h1:kOqh6YHBtK8aywxGerMG2Eq3H6Qgoqeo13Bk2Mv/nBs=
 github.com/fatih/color v1.15.0/go.mod h1:0h5ZqXfHYED7Bhv2ZJamyIOUej9KtShiJESRwBDUSsw=
+github.com/golang/snappy v0.0.2 h1:aeE13tS0IiQgFjYdoL8qN3K1N2bXXtI6Vi51/y7BpMw=
+github.com/golang/snappy v0.0.2/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
+github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/k0kubun/go-ansi v0.0.0-20180517002512-3bf9e2903213 h1:qGQQKEcAR99REcMpsXCp3lJ03zYT1PkRd3kQGPn9GVg=
 github.com/k0kubun/go-ansi v0.0.0-20180517002512-3bf9e2903213/go.mod h1:vNUNkEQ1e29fT/6vq2aBdFsgNPmy8qMdSay1npru+Sw=
+github.com/klauspost/compress v1.4.1/go.mod h1:RyIbtBH6LamlWaDj8nUwkbUhJ87Yi3uG0guNDohfE1A=
+github.com/klauspost/compress v1.11.4 h1:kz40R/YWls3iqT9zX9AHN3WoVsrAWVyui5sxuLqiXqU=
+github.com/klauspost/compress v1.11.4/go.mod h1:aoV0uJVorq1K+umq18yTdKaF57EivdYsUV+/s2qKfXs=
+github.com/klauspost/cpuid v1.2.0/go.mod h1:Pj4uuM528wm8OyEC2QMXAi2YiTZ96dNQPGgoMS4s3ek=
+github.com/klauspost/pgzip v1.2.5 h1:qnWYvvKqedOF2ulHpMG72XQol4ILEJ8k2wwRl/Km8oE=
+github.com/klauspost/pgzip v1.2.5/go.mod h1:Ch1tH69qFZu15pkjo5kYi6mth2Zzwzt50oCQKQE9RUs=
 github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
 github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovkB8vQcUbaXHg=
 github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
 github.com/mattn/go-isatty v0.0.17 h1:BTarxUcIeDqL27Mc+vyvdWYSL28zpIhv3RoTdsLMPng=
 github.com/mattn/go-isatty v0.0.17/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
+github.com/mattn/go-runewidth v0.0.14 h1:+xnbZSEeDbOIg5/mE6JF0w6n9duR1l3/WmbinWVwUuU=
+github.com/mattn/go-runewidth v0.0.14/go.mod h1:Jdepj2loyihRzMpdS35Xk/zdY8IAYHsh153qUoGf23w=
+github.com/mholt/archiver/v3 v3.5.1 h1:rDjOBX9JSF5BvoJGvjqK479aL70qh9DIpZCl+k7Clwo=
+github.com/mholt/archiver/v3 v3.5.1/go.mod h1:e3dqJ7H78uzsRSEACH1joayhuSyhnonssnDhppzS1L4=
+github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db h1:62I3jR2EmQ4l5rM/4FEfDWcRD+abF5XlKShorW5LRoQ=
+github.com/mitchellh/colorstring v0.0.0-20190213212951-d06e56a500db/go.mod h1:l0dey0ia/Uv7NcFFVbCLtqEBQbrT4OCwCSKTEv6enCw=
+github.com/nwaples/rardecode v1.1.0 h1:vSxaY8vQhOcVr4mm5e8XllHWTiM4JF507A0Katqw7MQ=
+github.com/nwaples/rardecode v1.1.0/go.mod h1:5DzqNKiOdpKKBH87u8VlvAnPZMXcGRhxWkRpHbbfGS0=
+github.com/pierrec/lz4/v4 v4.1.2 h1:qvY3YFXRQE/XB8MlLzJH7mSzBs74eA2gg52YTk6jUPM=
+github.com/pierrec/lz4/v4 v4.1.2/go.mod h1:gZWDp/Ze/IJXGXf23ltt2EXimqmTUXEy0GFuRQyBid4=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
+github.com/rivo/uniseg v0.4.3 h1:utMvzDsuh3suAEnhH0RdHmoPbU648o6CvXxTx4SBMOw=
+github.com/rivo/uniseg v0.4.3/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUcx88=
 github.com/russross/blackfriday/v2 v2.1.0 h1:JIOH55/0cWyOuilr9/qlrm0BSXldqnqwMsf35Ld67mk=
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/schollz/progressbar/v3 v3.13.1 h1:o8rySDYiQ59Mwzy2FELeHY5ZARXZTVJC7iHD6PEFUiE=
+github.com/schollz/progressbar/v3 v3.13.1/go.mod h1:xvrbki8kfT1fzWzBT/UZd9L6GA+jdL7HAgq2RFnO6fQ=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
+github.com/stretchr/testify v1.8.0 h1:pSgiaMZlXftHpm5L7V1+rVB+AZJydKsMxsQBIJw4PKk=
+github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU=
+github.com/ulikunitz/xz v0.5.8/go.mod h1:nbz6k7qbPmH4IRqmfOplQw/tblSgqTqBwxkY0oWt/14=
+github.com/ulikunitz/xz v0.5.9 h1:RsKRIA2MO8x56wkkcd3LbtcE/uMszhb6DpRf+3uwa3I=
+github.com/ulikunitz/xz v0.5.9/go.mod h1:nbz6k7qbPmH4IRqmfOplQw/tblSgqTqBwxkY0oWt/14=
 github.com/urfave/cli/v2 v2.25.0 h1:ykdZKuQey2zq0yin/l7JOm9Mh+pg72ngYMeB0ABn6q8=
 github.com/urfave/cli/v2 v2.25.0/go.mod h1:GHupkWPMM0M/sj1a2b4wUrWBPzazNrIjouW6fmdJLxc=
+github.com/xi2/xz v0.0.0-20171230120015-48954b6210f8 h1:nIPpBwaJSVYIxUFsDv3M8ofmx9yWTog9BfvIu0q41lo=
+github.com/xi2/xz v0.0.0-20171230120015-48954b6210f8/go.mod h1:HUYIGzjTL3rfEspMxjDjgmT5uz5wzYJKVo23qUhYTos=
 github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673 h1:bAn7/zixMGCfxrRTfdpNzjtPYqr8smhKouy9mxVdGPU=
 github.com/xrash/smetrics v0.0.0-20201216005158-039620a65673/go.mod h1:N3UwUGtsrSj3ccvlPHLoLsHnpR27oXr4ZE984MbSER8=
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.6.0 h1:MVltZSvRTcU2ljQOhs94SXPftV6DCNnZViHeQps87pQ=
 golang.org/x/sys v0.6.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/term v0.6.0 h1:clScbb1cHjoCkyRbWwBEUZ5H/tIFu5TAXIqaZD0Gcjw=
+golang.org/x/term v0.6.0/go.mod h1:m6U89DPEgQRMq3DNkDClhWw02AUbt2daBVO4cn4Hv9U=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

internal/pkg/config/urls.go

@@ -0,0 +1,102 @@
+package config
+
+type JavaFileItem struct {
+	FileName string
+	URL      string
+}
+type UrlItem struct {
+	In         *JavaFileItem
+	Expected   string
+	SimpleName string
+}
+
+var Url_Items = []*UrlItem{
+	{
+		In: &JavaFileItem{
+			FileName: "openjdk-19+36_windows-x64_bin.zip",
+			URL:      "https://download.java.net/openjdk/jdk19/ri/openjdk-19+36_windows-x64_bin.zip",
+		},
+		Expected:   "jdk-19",
+		SimpleName: "19",
+	},
+	{
+		In: &JavaFileItem{
+			FileName: "openjdk-18+36_windows-x64_bin.zip",
+			URL:      "https://download.java.net/openjdk/jdk18/ri/openjdk-18+36_windows-x64_bin.zip",
+		},
+		Expected:   "jdk-18",
+		SimpleName: "18",
+	},
+	{
+		In: &JavaFileItem{
+			FileName: "openjdk-17+35_windows-x64_bin.zip",
+			URL:      "https://download.java.net/openjdk/jdk17/ri/openjdk-17+35_windows-x64_bin.zip",
+		},
+		Expected:   "jdk-17",
+		SimpleName: "17",
+	},
+	{
+		In: &JavaFileItem{
+			FileName: "openjdk-16+36_windows-x64_bin.zip",
+			URL:      "https://download.java.net/openjdk/jdk16/ri/openjdk-16+36_windows-x64_bin.zip",
+		},
+		Expected:   "jdk-16",
+		SimpleName: "16",
+	},
+	{
+		In: &JavaFileItem{
+			FileName: "openjdk-15+36_windows-x64_bin.zip",
+			URL:      "https://download.java.net/openjdk/jdk15/ri/openjdk-15+36_windows-x64_bin.zip",
+		},
+		Expected:   "jdk-15",
+		SimpleName: "15",
+	},
+	{
+		In: &JavaFileItem{
+			FileName: "openjdk-14+36_windows-x64_bin.zip",
+			URL:      "https://download.java.net/openjdk/jdk14/ri/openjdk-14+36_windows-x64_bin.zip",
+		},
+		Expected:   "jdk-14",
+		SimpleName: "14",
+	},
+	{
+		In: &JavaFileItem{
+			FileName: "openjdk-13+33_windows-x64_bin.zip",
+			URL:      "https://download.java.net/openjdk/jdk13/ri/openjdk-13+33_windows-x64_bin.zip",
+		},
+		Expected:   "jdk-13",
+		SimpleName: "13",
+	},
+	{
+		In: &JavaFileItem{
+			FileName: "openjdk-12+32_windows-x64_bin.zip",
+			URL:      "https://download.java.net/openjdk/jdk12/ri/openjdk-12+32_windows-x64_bin.zip",
+		},
+		Expected:   "jdk-12",
+		SimpleName: "12",
+	},
+	{
+		In: &JavaFileItem{
+			FileName: "openjdk-11+28_windows-x64_bin.zip",
+			URL:      "https://download.java.net/openjdk/jdk11/ri/openjdk-11+28_windows-x64_bin.zip",
+		},
+		Expected:   "jdk-11",
+		SimpleName: "11",
+	},
+	{
+		In: &JavaFileItem{
+			FileName: "jdk-9+181_windows-x64_ri.zip",
+			URL:      "https://download.java.net/openjdk/jdk9/ri/jdk-9+181_windows-x64_ri.zip",
+		},
+		Expected:   "jdk-9",
+		SimpleName: "9",
+	},
+	{
+		In: &JavaFileItem{
+			FileName: "openjdk-8u42-b03-windows-i586-14_jul_2022.zip",
+			URL:      "https://download.java.net/openjdk/jdk8u42/ri/openjdk-8u42-b03-windows-i586-14_jul_2022.zip",
+		},
+		Expected:   "jdk-8",
+		SimpleName: "8",
+	},
+}

internal/pkg/download/download.go

@@ -0,0 +1,72 @@
+package download
+
+import (
+	"fmt"
+	"io"
+	"io/fs"
+	"io/ioutil"
+	"net/http"
+	"os"
+	"time"
+
+	"github.com/forget-the-bright/j/internal/pkg/errs"
+	"github.com/k0kubun/go-ansi"
+	"github.com/schollz/progressbar/v3"
+)
+
+// Download 下载资源并另存为
+func Download(srcURL string, filename string, flag int, perm fs.FileMode, withProgress bool) (size int64, err error) {
+	resp, err := http.Get(srcURL)
+	if err != nil {
+		return 0, errs.NewDownloadError(srcURL, err)
+	}
+	defer resp.Body.Close()
+
+	f, err := os.OpenFile(filename, flag, perm)
+	if err != nil {
+		return 0, errs.NewDownloadError(srcURL, err)
+	}
+	defer f.Close()
+
+	var dst io.Writer
+	if withProgress {
+		bar := progressbar.NewOptions64(
+			resp.ContentLength,
+			progressbar.OptionEnableColorCodes(true),
+			progressbar.OptionSetTheme(progressbar.Theme{
+				Saucer:        "=",
+				SaucerHead:    ">",
+				SaucerPadding: " ",
+				BarStart:      "[",
+				BarEnd:        "]",
+			}),
+			progressbar.OptionSetWidth(15),
+			progressbar.OptionSetDescription("Downloading"),
+			progressbar.OptionSetWriter(ansi.NewAnsiStdout()),
+			progressbar.OptionShowBytes(true),
+			progressbar.OptionThrottle(65*time.Millisecond),
+			progressbar.OptionShowCount(),
+			progressbar.OptionOnCompletion(func() {
+				_, _ = fmt.Fprint(ansi.NewAnsiStdout(), "\n")
+			}),
+			// progressbar.OptionSpinnerType(35),
+			// progressbar.OptionFullWidth(),
+		)
+		_ = bar.RenderBlank()
+		dst = io.MultiWriter(f, bar)
+
+	} else {
+		dst = f
+	}
+	return io.Copy(dst, resp.Body)
+}
+
+// DownloadAsBytes 返回下载资源的原始字节切片
+func DownloadAsBytes(srcURL string) (data []byte, err error) {
+	resp, err := http.Get(srcURL)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+	return ioutil.ReadAll(resp.Body)
+}

internal/pkg/errs/error.go

@@ -0,0 +1,88 @@
+package errs
+
+import (
+	"errors"
+	"fmt"
+	"strings"
+)
+
+var (
+	// ErrVersionNotFound 版本不存在
+	ErrVersionNotFound = errors.New("version not found")
+	// ErrPackageNotFound 版本包不存在
+	ErrPackageNotFound = errors.New("installation package not found")
+)
+
+var (
+	// ErrUnsupportedChecksumAlgorithm 不支持的校验和算法
+	ErrUnsupportedChecksumAlgorithm = errors.New("unsupported checksum algorithm")
+	// ErrChecksumNotMatched 校验和不匹配
+	ErrChecksumNotMatched = errors.New("file checksum does not match the computed checksum")
+	// ErrChecksumFileNotFound 校验和文件不存在
+	ErrChecksumFileNotFound = errors.New("checksum file not found")
+)
+
+// URLUnreachableError URL不可达错误
+type URLUnreachableError struct {
+	err error
+	url string
+}
+
+// NewURLUnreachableError 返回URL不可达错误实例
+func NewURLUnreachableError(url string, err error) error {
+	return &URLUnreachableError{
+		err: err,
+		url: url,
+	}
+}
+
+func (e URLUnreachableError) Error() string {
+	var buf strings.Builder
+	buf.WriteString(fmt.Sprintf("URL %q is unreachable", e.url))
+	if e.err != nil {
+		buf.WriteString(" ==> " + e.err.Error())
+	}
+	return buf.String()
+}
+
+func (e URLUnreachableError) Err() error {
+	return e.err
+}
+
+func (e URLUnreachableError) URL() string {
+	return e.url
+}
+
+// DownloadError 下载失败错误
+type DownloadError struct {
+	url string
+	err error
+}
+
+// NewDownloadError 返回下载失败错误实例
+func NewDownloadError(url string, err error) error {
+	return &DownloadError{
+		url: url,
+		err: err,
+	}
+}
+
+// Error 返回错误字符串
+func (e DownloadError) Error() string {
+	var buf strings.Builder
+	buf.WriteString(fmt.Sprintf("Resource(%s) download failed", e.url))
+	if e.err != nil {
+		buf.WriteString(" ==> " + e.err.Error())
+	}
+	return buf.String()
+}
+
+// Err 返回错误对象
+func (e DownloadError) Err() error {
+	return e.err
+}
+
+// URL 返回资源URL
+func (e DownloadError) URL() string {
+	return e.url
+}

main.go

@@ -1,6 +1,10 @@
 package main
 
-import "github.com/forget-the-bright/j/cli"
+import (
+	"os"
+
+	"github.com/forget-the-bright/j/cli"
+)
 
 func main() {
 	/* dir, _ := os.Getwd()
@@ -10,5 +14,9 @@ func main() {
 		fmt.Println(os.Args[1])
 		cli.Use(os.Args[1]) //"1.17.9"
 	} */
-	cli.Run()
+	//cli.Run()
+	if len(os.Args) > 1 {
+		cli.Install(os.Args[1])
+	}
+
 }