Commons-io文件操作详解编程语言

import java.io.BufferedReader; 
import java.io.BufferedWriter; 
import java.io.File; 
import java.io.FileWriter; 
import java.io.IOException; 
import java.io.StringReader; 
import java.nio.charset.Charset; 
import java.util.ArrayList; 
import java.util.List; 
   
import org.apache.commons.io.FileUtils; 
   
   
/** 
 * 文件操作工具类 
 * @version 1.0 2013/07/16 
 * 
 */ 
public class FileUtil { 
       
    /**   
     * 复制文件或者目录,复制前后文件完全一样。   
     * @param resFilePath   源文件路径   
     * @param distFolder    目标文件夹   
     * @IOException         当操作发生异常时抛出   
     */ 
    public static void copyFile(String resFilePath, String distFolder)   
            throws IOException {   
        File resFile = new File(resFilePath);   
        File distFile = new File(distFolder);   
        if (resFile.isDirectory()) { // 目录时   
            FileUtils.copyDirectoryToDirectory(resFile, distFile);   
        } else if (resFile.isFile()) { // 文件时   
            // FileUtils.copyFileToDirectory(resFile, distFile, true);   
            FileUtils.copyFileToDirectory(resFile, distFile);   
        }   
    }   
       
       
    /**   
     * 删除一个文件或者目录   
     * @param targetPath     文件或者目录路径   
     * @IOException 当操作发生异常时抛出   
     */ 
    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();   
        }   
    }   
    
    /**   
     * 将字符串写入指定文件(当指定的父路径中文件夹不存在时，会最大限度去创建，以保证保存成功！)   
     *    
     * @param res         原字符串   
     * @param filePath    文件路径   
     * @return 成功标记   
     * @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()) {// 不存在时创建   
                distFile.getParentFile().mkdirs();   
            }   
            bufferedReader = new BufferedReader(new StringReader(res));   
            bufferedWriter = new BufferedWriter(new FileWriter(distFile));   
            char buf[] = new char[1024]; // 字符缓冲区   
            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;   
    }   
       
    /**   
     * 取得指定文件内容  
     *    
     * @param res         原字符串   
     * @param filePath    文件路径   
     * @return 成功标记   
     * @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;   
    }   
       
    /** 
     * 给指定文件追加内容 
     * @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; 
        } 
    } 
       
   
}