Comment lire et écrire des fichiers en Java pour éviter les caractères tronqués

/**
      * 读取文件内容
      * 
      * @param filePathAndName
      * String 如 c:\\1.txt 绝对路径
      * @return boolean
      */
    public static String readFile(String filePath) {
        String fileContent = "";
        try {
            File f = new File(filePath);
            if (f.isFile() && f.exists()) {
                InputStreamReader read = new InputStreamReader(new FileInputStream(f), "UTF-8");
                BufferedReader reader = new BufferedReader(read);
                String line;
                while ((line = reader.readLine()) != null) {
                    fileContent += line;
                }
                read.close();
            }
        } catch (Exception e) {
            System.out.println("读取文件内容操作出错");
            e.printStackTrace();
        }
        return fileContent;
    }

/**
     * 
     * @Title: writeFile
     * @Description: 写文件
     * @param @param filePath 文件路径
     * @param @param fileContent    文件内容
     * @return void    返回类型
     * @throws
     */
    public static void writeFile(String filePath, String fileContent) {
        try {
            File f = new File(filePath);
            if (!f.exists()) {
                f.createNewFile();
            }
            OutputStreamWriter write = new OutputStreamWriter(new FileOutputStream(f), "UTF-8");
            BufferedWriter writer = new BufferedWriter(write);
            writer.write(fileContent);
            writer.close();
        } catch (Exception e) {
            System.out.println("写文件内容操作出错");
            e.printStackTrace();
        }
    }