huangzj
139 lines
2.7 KiB
Go
139 lines
2.7 KiB
Go
/*
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* @Author : huangzj
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* @Time : 2020/4/26 14:55
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* @Description： 文件读取工具
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*/
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package file
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import (
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"bufio"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"os"
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)
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/*
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* @param 文件地址
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* @return string 文件内容
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* @return FileError 报错信息
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* @description 一次直接读取文件中的内容不进行中间处理
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*/
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func ReadInOnce(filePath string) (string, error) {
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err, is, _ := IsFileExist(filePath)
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if err != nil {
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return "", err
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}
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if !is {
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return "", errors.New("非文件")
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}
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fd, iErr := ioutil.ReadFile(filePath)
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if iErr != nil {
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return "", iErr
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}
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return string(fd), nil
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}
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/*
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* @param filePath 文件地址
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* @return string 读取的文件内容
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* @return FileError 读取错误，如果没有错误返回nil
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* @description 通过for循环去读取文件，这边提供一种读取方式，通过这种方式来处理对应读取的操作
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*/
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func ReadByCircle(filePath string) (string, error) {
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var fs string
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file, err := os.Open(filePath)
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if err != nil {
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return "", err
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}
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defer file.Close()
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inputReader := bufio.NewReader(file)
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for {
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inputString, readerError := inputReader.ReadString('\n')
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if readerError == io.EOF {
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if inputString != "" {
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fs = fmt.Sprint(fs, inputString)
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}
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break
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}
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fs = fmt.Sprint(fs, inputString)
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}
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return fs, nil
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}
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func ReadFileLineNum(filePath string) (int, error) {
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file, err := os.Open(filePath)
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if err != nil {
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return 0, err
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}
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defer file.Close()
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num := 0
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inputReader := bufio.NewReader(file)
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for {
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_, readerError := inputReader.ReadString('\n')
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if readerError == io.EOF {
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num++
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break
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}
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num++
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}
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return num, nil
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}
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func ReadFileLineNumExceptEmptyLine(filePath string) (int, error) {
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file, err := os.Open(filePath)
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if err != nil {
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return 0, err
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}
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defer file.Close()
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num := 0
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inputReader := bufio.NewReader(file)
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for {
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input, readerError := inputReader.ReadString('\n')
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if readerError == io.EOF {
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if input != "\r\n" && input != "" {
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num++
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}
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break
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}
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if input != "\r\n" && input != "" {
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num++
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}
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}
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return num, nil
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}
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//读取json文件内容
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//这边发现就是说如果按照正常的文件读取方式来读取json文件，读取到的内容是乱码的
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//所以这边通过加解码的方式来读取，返回一个json串出去
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//外部的调用者通过解析转换成对应的结构体对象
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//@param filePath 文件路径
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func ReadJsonFile(filePath string) (string, error) {
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filePtr, err := os.Open(filePath)
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if err != nil {
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return "", err
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}
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defer filePtr.Close()
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decoder := json.NewDecoder(filePtr)
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sMap := make(map[string]interface{}, 0)
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err = decoder.Decode(&sMap)
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if err != nil {
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return "", err
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}
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bs, err := json.Marshal(sMap)
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if err != nil {
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return "", err
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}
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return string(bs), nil
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}
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