{"id":4128,"date":"2018-10-22T08:20:33","date_gmt":"2018-10-22T00:20:33","guid":{"rendered":"https:\/\/ixyzero.com\/blog\/?p=4128"},"modified":"2018-10-22T08:20:33","modified_gmt":"2018-10-22T00:20:33","slug":"go%e8%af%ad%e8%a8%80%e5%ad%a6%e4%b9%a02-%e6%96%87%e4%bb%b6%e6%93%8d%e4%bd%9c","status":"publish","type":"post","link":"https:\/\/ixyzero.com\/blog\/archives\/4128.html","title":{"rendered":"Go\u8bed\u8a00\u5b66\u4e60#2-\u6587\u4ef6\u64cd\u4f5c"},"content":{"rendered":"

=Start=<\/p>\n

\u7f18\u7531\uff1a<\/h4>\n

\u6700\u8fd1\u5728\u8ddf\u7740\u90dd\u6797\u8001\u5e08\u7684\u300aGo\u8bed\u8a00\u6838\u5fc336\u8bb2\u300b\u8fd9\u95e8\u8bfe\u7a0b\u91cd\u62feGo\u8bed\u8a00\u5b66\u4e60\uff08\u4e4b\u524d\u572815\u5e74\u7684\u65f6\u5019\u6211\u81ea\u5b66\u8fc7\u4e00\u6bb5\u65f6\u95f4\uff0c\u4e0d\u8fc7\u540e\u6765\u6ca1\u600e\u4e48\u7528Go\u6765\u5199\u4ee3\u7801\uff0c\u6240\u4ee5\u6709\u4e9b\u5185\u5bb9\u90fd\u5fd8\u4e86\uff0c\u8fd9\u6b21\u5e0c\u671b\u80fd\u575a\u6301\u4e0b\u53bb\uff09\uff0c\u6240\u4ee5\u51c6\u5907\u628a\u4e00\u4e9b\u5e38\u89c1\u529f\u80fd\u7528Go\u8bed\u8a00\u8bd5\u7740\u5b9e\u8df5\u4e00\u904d\uff0c\u52a0\u5f3a\u5b66\u4e60\u6548\u679c\u548c\u5bf9\u8fd9\u95e8\u8bed\u8a00\u7684\u611f\u89c9\u3002<\/p>\n

\u6b63\u6587\uff1a<\/h4>\n

\u53c2\u8003\u89e3\u7b54\uff1a<\/h5>\n
\u5982\u4f55\u83b7\u53d6\u5f53\u524d\u8fd0\u884c\u6587\u4ef6\u6240\u5728\u7684\u76ee\u5f55\u53ca\u6587\u4ef6\u540d\uff1f<\/span><\/h6>\n
package main\r\n\r\nimport (\r\n    \"fmt\"\r\n    \"log\"\r\n    \"os\"\r\n    \"path\/filepath\"\r\n)\r\n\r\nfunc main() {\r\n    fmt.Printf(\"Filename: %s\\n\", os.Args[0])\r\n    fmt.Printf(\"filepath.Base(): %s\\n\", filepath.Base(os.Args[0]))\r\n    fmt.Printf(\"filepath.Dir(): %s\\n\", filepath.Dir(os.Args[0]))\r\n\r\n    dir, err := filepath.Abs(filepath.Dir(os.Args[0]))\r\n    if err != nil {\r\n        log.Fatal(err)\r\n    }\r\n    fmt.Printf(\"filepath.Abs(filepath.Dir()): %s\\n\", dir)\r\n\r\n    \/\/ \u53e6\u4e00\u79cd\u65b9\u6cd5\r\n    ex, err := os.Executable()\r\n    if err != nil {\r\n        panic(err)\r\n    }\r\n    exPath := filepath.Dir(ex)\r\n    fmt.Println()\r\n    fmt.Println(ex)\r\n    fmt.Println(exPath)\r\n}<\/pre>\n
\u5982\u4f55\u68c0\u67e5\u4e00\u4e2a\u6587\u4ef6\/\u76ee\u5f55\u662f\u5426\u5b58\u5728\uff1f<\/span><\/h6>\n
\/\/ \u68c0\u67e5\u4f20\u5165\u7684\u5b57\u7b26\u4e32name\u6240\u6307\u5411\u7684\u6587\u4ef6\u6216\u76ee\u5f55\u662f\u5426\u5b58\u5728\uff0c\u5b58\u5728\u5219\u8fd4\u56detrue\r\nfunc Exists(name string) bool {\r\n    if _, err := os.Stat(name); err != nil {\r\n        if os.IsNotExist(err) {\r\n            return false\r\n        }\r\n    }\r\n    return true\r\n}<\/pre>\n
\u4f46\u662f\uff0c\u4e0b\u9762\u7684\u8fd9\u4e2a\u7248\u672c\u4f1a\u66f4\u597d\u4e00\u4e9b\uff08\u56e0\u4e3a\u591a\u8fd4\u56de\u4e86\u4e00\u4e2aerror\u5b57\u6bb5\uff09\uff1a<\/p>\n
func Exists(name string) (bool, error) {\r\n    _, err := os.Stat(name)\r\n    if os.IsNotExist(err) {\r\n        return false, nil\r\n    }\r\n    return err != nil, err\r\n}<\/pre>\n
\u5982\u4f55\u5224\u65ad\u4e00\u4e2a\u6587\u4ef6\u662f\u5426\u662f\u76ee\u5f55\uff1f<\/h6>\n
if stat, err := os.Stat(name); err == nil && stat.IsDir() {\r\n    \/\/ name is a directory\r\n}<\/pre>\n
\u5982\u4f55\u8fdb\u884c\u6587\u4ef6\u8bfb\u5199\u64cd\u4f5c\uff1f<\/span><\/h5>\n
\u65b9\u6cd5\u4e00\uff1a\u57fa\u4e8e\u539f\u751f\u7684os.Open\/os.Create\u548cRead\/Write\u64cd\u4f5c<\/strong><\/p>\n
package main\r\n\r\nimport (\r\n    \"io\"\r\n    \"os\"\r\n)\r\n\r\nfunc main() {\r\n    \/\/ open input file\r\n    fi, err := os.Open(\"input.txt\")\r\n    if err != nil {\r\n        panic(err)\r\n    }\r\n    \/\/ close fi on exit and check for its returned error\r\n    defer func() {\r\n        if err := fi.Close(); err != nil {\r\n            panic(err)\r\n        }\r\n    }()\r\n\r\n    \/\/ open output file\r\n    fo, err := os.Create(\"output.txt\")\r\n    if err != nil {\r\n        panic(err)\r\n    }\r\n    \/\/ close fo on exit and check for its returned error\r\n    defer func() {\r\n        if err := fo.Close(); err != nil {\r\n            panic(err)\r\n        }\r\n    }()\r\n\r\n    \/\/ \u521b\u5efa\u4e00\u4e2a1024\u5b57\u8282\u7684\u7f13\u51b2\u533a\u7528\u4e8e\u4e34\u65f6\u5b58\u653e\u8bfb\u53d6\u7684\u5185\u5bb9\r\n    buf := make([]byte, 1024)\r\n    for {\r\n        \/\/ \u5c1d\u8bd5\u6bcf\u6b21\u8bfb\u53d61024\u5b57\u8282\u7684\u5185\u5bb9\u5b58\u5165\u7f13\u51b2\u533abuf\r\n        n, err := fi.Read(buf)\r\n        if err != nil && err != io.EOF {\r\n            panic(err)\r\n        }\r\n        if n == 0 {\r\n            break\r\n        }\r\n\r\n        \/\/ \u8c03\u7528Write\u63a5\u53e3\u5c06\u7f13\u51b2\u533a\u5185\u5bb9\u5199\u5165\u6587\u4ef6\r\n        if _, err := fo.Write(buf[:n]); err != nil {\r\n            panic(err)\r\n        }\r\n    }\r\n}<\/pre>\n
\u65b9\u6cd5\u4e8c\uff1a\u4f7f\u7528bufio<\/strong><\/p>\n
package main\r\n\r\nimport (\r\n    \"bufio\"\r\n    \"io\"\r\n    \"os\"\r\n)\r\n\r\nfunc main() {\r\n    \/\/ \u6253\u5f00\u8f93\u5165\u6587\u4ef6\r\n    fi, err := os.Open(\"input.txt\")\r\n    if err != nil {\r\n        panic(err)\r\n    }\r\n    \/\/ \u4f7f\u7528defer\u51fd\u6570\u8fdb\u884c\u6587\u4ef6\u5173\u95ed\u64cd\u4f5c\uff0c\u82e5\u5173\u95ed\u5931\u8d25\u5219\u629b\u51fapanic\r\n    defer func() {\r\n        if err := fi.Close(); err != nil {\r\n            panic(err)\r\n        }\r\n    }()\r\n    \/\/ \u521b\u5efa\u8bfb\u7f13\u51b2\r\n    r := bufio.NewReader(fi)\r\n\r\n    \/\/ open output file\r\n    fo, err := os.Create(\"output.txt\")\r\n    if err != nil {\r\n        panic(err)\r\n    }\r\n    \/\/ close fo on exit and check for its returned error\r\n    defer func() {\r\n        if err := fo.Close(); err != nil {\r\n            panic(err)\r\n        }\r\n    }()\r\n    \/\/ \u521b\u5efa\u5199\u7f13\u51b2\r\n    w := bufio.NewWriter(fo)\r\n\r\n    \/\/ make a buffer to keep chunks that are read\r\n    buf := make([]byte, 1024)\r\n    for {\r\n        \/\/ read a chunk\r\n        n, err := r.Read(buf)\r\n        if err != nil && err != io.EOF {\r\n            panic(err)\r\n        }\r\n        if n == 0 {\r\n            break\r\n        }\r\n\r\n        \/\/ write a chunk\r\n        if _, err := w.Write(buf[:n]); err != nil {\r\n            panic(err)\r\n        }\r\n    }\r\n\r\n    if err = w.Flush(); err != nil {\r\n        panic(err)\r\n    }\r\n}<\/pre>\n
\u65b9\u6cd5\u4e09\uff1a\u4f7f\u7528ioutil\u5c01\u88c5<\/strong><\/span><\/p>\n
package main\r\n\r\nimport (\r\n    \"io\/ioutil\"\r\n)\r\n\r\nfunc main() {\r\n    \/\/ \u5c06\u6587\u4ef6\u5185\u5bb9\u4e00\u6b21\u6027\u8bfb\u5165\u5185\u5b58\uff08\u4e0d\u9002\u7528\u4e8e\u5927\u6587\u4ef6\uff09\r\n    b, err := ioutil.ReadFile(\"input.txt\")\r\n    if err != nil {\r\n        panic(err)\r\n    }\r\n\r\n    \/\/ \u5c06\u5185\u5bb9\u4e00\u6b21\u6027\u5199\u5165\u6587\u4ef6\r\n    err = ioutil.WriteFile(\"output.txt\", b, 0644)\r\n    if err != nil {\r\n        panic(err)\r\n    }\r\n}<\/pre>\n
Go\u8bed\u8a00\u4e2d\u5982\u4f55\u4e00\u6b21\u8bfb\u53d6\u6587\u4ef6\u7684\u4e00\u884c\u5185\u5bb9\uff1f<\/span>\uff08\u501f\u52a9bufio.Scanner<\/a>\uff09<\/h6>\n
package main\r\n\r\nimport (\r\n    \"bufio\"\r\n    \"fmt\"\r\n    \"log\"\r\n    \"os\"\r\n)\r\n\r\nfunc main() {\r\n    file, err := os.Open(\"\/path\/to\/file.txt\")\r\n    if err != nil {\r\n        log.Fatal(err)\r\n    }\r\n    defer file.Close()\r\n\r\n    # \u53ef\u4ee5\u4f7f\u7528bufio.NewScanner\u8fdb\u884c\u4e00\u6b21\u8bfb\u53d6\u4e00\u884c\u5904\u7406\r\n    scanner := bufio.NewScanner(file)\r\n    for scanner.Scan() {\r\n        fmt.Println(scanner.Text())\r\n    }\r\n\r\n    if err := scanner.Err(); err != nil {\r\n        log.Fatal(err)\r\n    }\r\n}<\/pre>\n
Go\u8bed\u8a00\u4e2d\u5982\u4f55\u5904\u7406\u5404\u7c7b\u914d\u7f6e\u6587\u4ef6\uff1f<\/h6>\n
\u53ef\u4ee5\u901a\u8fc7\u521b\u5efa\u5bf9\u5e94\u683c\u5f0f\u7684\u7ed3\u6784\u4f53struct\u6765\u8fdb\u884c\u5904\u7406\uff0c\u5177\u4f53\u53ef\u4ee5\u53c2\u8003\u300cHow to handle configuration in Go<\/a>\u300d\u3002<\/p>\n
 <\/p>\n
\u53c2\u8003\u94fe\u63a5\uff1a<\/h5>\n