Commons-io文件操作

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  
        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;
    }
}



}
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