Golang jsn格式文件解析

来源：互联网发布：dnf端口辅助怎么稳定编辑：程序博客网时间：2024/06/05 20:47

package mainimport ("bytes""encoding/json""fmt""log""os""regexp""time")const configFileSizeLimit = 10 << 20var defaultConfig = &struct {netTimeout   int64fileDeadtime string}{netTimeout:   15,fileDeadtime: "24h",}//有了`json:network`这种注释，后面json解析就可以把相应的数据塞到对应的结构里面来type Config struct {Network NetworkConfig `json:network`Files   []FileConfig  `json:files`}type NetworkConfig struct {Servers        []string `json:servers`SSLCertificate string   `json:"ssl certificate"`SSLKey         string   `json:"ssl key"`SSLCA          string   `json:"ssl ca"`Timeout        int64    `json:timeout`timeout        time.Duration}type FileConfig struct {Paths    []string          `json:paths`Fields   map[string]string `json:fields`DeadTime string            `json:"dead time"`deadtime time.Duration}func main() {LoadConfig("F:/logstast_forwarder.conf")}func LoadConfig(path string) (config Config, err error) {config_file, err := os.Open(path)if err != nil {emit("Failed to open config file '%s': %s\n", path, err)return}fi, _ := config_file.Stat()if size := fi.Size(); size > (configFileSizeLimit) {emit("config file (%q) size exceeds reasonable limit (%d) - aborting", path, size)return // REVU: shouldn't this return an error, then?}if fi.Size() == 0 {emit("config file (%q) is empty, skipping", path)return}buffer := make([]byte, fi.Size())_, err = config_file.Read(buffer)emit("\n %s\n", buffer)buffer, err = StripComments(buffer) //去掉注释if err != nil {emit("Failed to strip comments from json: %s\n", err)return}buffer = []byte(os.ExpandEnv(string(buffer))) //特殊err = json.Unmarshal(buffer, &config) //解析json格式数据if err != nil {emit("Failed unmarshalling json: %s\n", err)return}fmt.Printf("111111111 %s \n", config.Network.Servers)for k, _ := range config.Files {if config.Files[k].DeadTime == "" {config.Files[k].DeadTime = defaultConfig.fileDeadtime}config.Files[k].deadtime, err = time.ParseDuration(config.Files[k].DeadTime)if err != nil {emit("Failed to parse dead time duration '%s'. Error was: %s\n", config.Files[k].DeadTime, err)return}}return}func StripComments(data []byte) ([]byte, error) {data = bytes.Replace(data, []byte("\r"), []byte(""), 0) // Windowslines := bytes.Split(data, []byte("\n"))                //split to muli linesfiltered := make([][]byte, 0)for _, line := range lines {match, err := regexp.Match(`^\s*#`, line)if err != nil {return nil, err}if !match {filtered = append(filtered, line)}}return bytes.Join(filtered, []byte("\n")), nil}func emit(msgfmt string, args ...interface{}) {log.Printf(msgfmt, args...)}

Json配置文件：

## json format file{  "network": {    "servers": [ "localhost:5043" ]  },  "files": [   {    "paths": [""]       }  ]}

输出结果：

111111111 [localhost:5043] 2015/10/05 16:45:21  ## json format file{  "network": {    "servers": [ "localhost:5043" ]  },  "files": [   {    "paths": [""]       }  ]}

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