import org.apache.commons.io.FileUtils;

/**
 * 文件操作工具類
 * @version 1.0 2013/07/16
 *
 */
public class FileUtil {
 
 /** 
     * 復制文件或者目錄,復制前后文件完全一樣。 
     * @param resFilePath   源文件路徑 
     * @param distFolder    目標文件夾 
     * @IOException         當操作發(fā)生異常時拋出 
     */
    public static void copyFile(String resFilePath, String distFolder) 
            throws IOException { 
        File resFile = new File(resFilePath); 
        File distFile = new File(distFolder); 
        if (resFile.isDirectory()) { // 目錄時 
            FileUtils.copyDirectoryToDirectory(resFile, distFile); 
        } else if (resFile.isFile()) { // 文件時 
            // FileUtils.copyFileToDirectory(resFile, distFile, true); 
            FileUtils.copyFileToDirectory(resFile, distFile); 
        } 
    } 
   
   
    /** 
     * 刪除一個文件或者目錄 
     * @param targetPath     文件或者目錄路徑 
     * @IOException 當操作發(fā)生異常時拋出 
     */
    public static void deleteFile(String targetPath) throws IOException { 
        File targetFile = new File(targetPath); 
        if (targetFile.isDirectory()) { 
            FileUtils.deleteDirectory(targetFile); 
        } else if (targetFile.isFile()) { 
            targetFile.delete(); 
        } 
    } 
 
    /** 
     * 將字符串寫入指定文件(當指定的父路徑中文件夾不存在時，會最大限度去創(chuàng)建，以保證保存成功！) 
     *  
     * @param res         原字符串 
     * @param filePath    文件路徑 
     * @return 成功標記 
     * @throws IOException
     */
    public static boolean string2File(String res, String filePath) throws IOException { 
        boolean flag = true; 
        BufferedReader bufferedReader = null; 
        BufferedWriter bufferedWriter = null; 
        try { 
            File distFile = new File(filePath); 
            if (!distFile.getParentFile().exists()) {// 不存在時創(chuàng)建 
                distFile.getParentFile().mkdirs(); 
            } 
            bufferedReader = new BufferedReader(new StringReader(res)); 
            bufferedWriter = new BufferedWriter(new FileWriter(distFile)); 
            char buf[] = new char[1024]; // 字符緩沖區(qū) 
            int len; 
            while ((len = bufferedReader.read(buf)) != -1) { 
                bufferedWriter.write(buf, 0, len); 
            } 
            bufferedWriter.flush(); 
            bufferedReader.close(); 
            bufferedWriter.close(); 
        } catch (IOException e) { 
            flag = false; 
            throw e;
        } 
        return flag; 
    } 
   
    /** 
     * 取得指定文件內容
     *  
     * @param res         原字符串 
     * @param filePath    文件路徑 
     * @return 成功標記 
     * @throws IOException
     */
    public static List<String> getContentFromFile(String filePath) throws IOException { 
     List<String> lists = null;
     try { 
      if(!(new File(filePath).exists())){
       return new ArrayList<String>();
      }
      lists = FileUtils.readLines(new File(filePath), Charset.defaultCharset());
     } catch (IOException e) { 
       throw e;
     } 
     return lists; 
    } 
   
    /**
     * 給指定文件追加內容
     * @param filePath
     * @param contents
     */
    public static void addContent(String filePath, List<String> contents) throws IOException {
      try {
   FileUtils.writeLines(new File(filePath), contents);
  } catch (IOException e) {
    throw e;
  }
    }
}