JAVA-文件读写模板

来源：互联网发布：linux设置共享目录编辑：程序博客网时间：2024/05/07 04:49
class FileEntry {    /**     * 读取文件的所有内容     * @param filePath 文件路径     * @param charset 编码     * @return 文件的全部内容，作为一个字符串返回     */    public static String readFile(String filePath, String charset) {        File file = new File(filePath);        Long filelength = file.length();        byte[] filecontent = new byte[filelength.intValue()];        FileInputStream in = null;        String result = null;        try {            in = new FileInputStream(file);            in.read(filecontent);            result = new String(filecontent, charset);        } catch (UnsupportedEncodingException e) {            // TODO Auto-generated catch block        } catch (FileNotFoundException e) {            // TODO Auto-generated catch block        } catch (IOException e) {            // TODO Auto-generated catch block        } finally {            try {                if (null != in)                    in.close();            } catch (IOException e) {                e.printStackTrace();            }        }        return result;    }    /**     * 读取文件内容     * @param filePath 文件路径     * @param charset 编码     * @return 文件的每一行     */    public static ArrayList<String> readFileLines(String filePath, String charset) {        BufferedReader reader = null;        ArrayList<String> lines = new ArrayList<String>();        try {            FileInputStream fis = new FileInputStream(filePath);            InputStreamReader isr = new InputStreamReader(fis, charset);             reader = new BufferedReader(isr);            String tempString = null;            // 一次读入一行，直到读入null为文件结束            while ((tempString = reader.readLine()) != null) {                lines.add(tempString);            }            reader.close();        } catch (UnsupportedEncodingException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } finally {            if (reader != null) {                try {                    reader.close();                } catch (IOException e1) {                }            }        }        return lines;    }    /**     * 获取指定文件夹下的所有文件名称（递归）     * @param folderPath 文件夹路径     * @return 每个文件的绝对路径     */    public static ArrayList<String> getFolderFiles(String folderPath) {        ArrayList<String> ret = new ArrayList<String>();        File fileObject = new File(folderPath);        if (fileObject.isFile())            ret.add(fileObject.getAbsolutePath());        else {            for (String subFilePath: fileObject.list()) {                ret.addAll(getFolderFiles(folderPath + File.separatorChar + subFilePath));            }        }        return ret;    }    /**     * 将指定内容写入文件中     * @param filePath 文件路径     * @param content 待写入内容     * @param charset 编码     */    public static void writeFile(String filePath, String content, String charset) {        BufferedWriter bw = null;        try {            File file = new File(filePath);            file.getParentFile().mkdirs();            bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(filePath), charset));            bw.write(content);            bw.flush();        } catch (UnsupportedEncodingException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (FileNotFoundException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } finally {            try {                if (null != bw)                    bw.close();            } catch (IOException e) {                e.printStackTrace();            }        }    }    /**     * 在文件尾追加内容     * @param content 待追加文本     * @param fileDes 文件路径     * @param charset 编码     */    public static void appendToFile(String filePath, String content, String charset) {        BufferedWriter bw = null;        try {            File file = new File(filePath);            file.getParentFile().mkdirs();            bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(filePath, true), charset));            bw.write(content);            bw.flush();        } catch (Exception e) {            e.printStackTrace();        } finally {            try {                if (null != bw)                    bw.close();            } catch (IOException e) {                e.printStackTrace();            }        }      }}
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