java操作文件汇总

/* 
package mytestfile;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * @author 
 */
public class Files {
	public static void main(String[] args) throws IOException {
		Files f = new Files();
		// System.out.println(f.readFile("f:\\LinkFile.java"));
		// f.readAllFile("f:\\","LinkFile.java");
		// f.readLineFile("f:\\","LinkFile.java");
		// System.out.println(f.fileIsNull("f:\\","122.txt"));
		// f.readFolderByFile("F:\\PDF");
		// System.out.println(f.createAndDeleteFolder("ss","f:\\"));
		// System.out.println(f.createAndDeleteFile("f:\\ss\\","TestFile.dat"));
		String[] ss = new String[50];
		for (int i = 0; i < ss.length; i++) {
			ss[i] = "信息技术和互联网(计算机软硬件,通讯) " + i;
		}
		f.writeFile("E:\\ss\\", "TestFile.txt", ss);
	}

	/**
	 * 文件的写入
	 * 
	 * @param filePath(文件路径)
	 * @param fileName(文件名)
	 * @param args[]
	 * @throws IOException
	 */
	public void writeFile(String filePath, String fileName, String[] args)
			throws IOException {
		FileWriter fw = new FileWriter(filePath + fileName);
		PrintWriter out = new PrintWriter(fw);
		for (int i = 0; i < args.length; i++) {
			out.write(args[i]);
			out.println();
			out.flush();
		}
		fw.close();
		out.close();
	}

	/**
	 * 文件的写入
	 * 
	 * @param filePath(文件路径)
	 * @param fileName(文件名)
	 * @param args
	 * @throws IOException
	 */
	public void writeFile(String filePath, String fileName, String args)
			throws IOException {
		FileWriter fw = new FileWriter(filePath + fileName);
		fw.write(args);
		fw.close();
	}

	/**
	 * 创建与删除文件
	 * 
	 * @param filePath
	 * @param fileName
	 * @return 创建成功返回true
	 * @throws IOException
	 */
	public boolean createAndDeleteFile(String filePath, String fileName)
			throws IOException {
		boolean result = false;
		File file = new File(filePath, fileName);
		if (file.exists()) {
			file.delete();
			result = true;
			System.out.println("文件已经删除！");
		} else {
			file.createNewFile();
			result = true;
			System.out.println("文件已经创建！");
		}
		return result;
	}

	/**
	 * 创建和删除目录
	 * 
	 * @param folderName
	 * @param filePath
	 * @return 删除成功返回true
	 */
	public boolean createAndDeleteFolder(String folderName, String filePath) {
		boolean result = false;
		try {
			File file = new File(filePath + folderName);
			if (file.exists()) {
				file.delete();
				System.out.println("目录已经存在，已删除!");
				result = true;
			} else {
				file.mkdir();
				System.out.println("目录不存在，已经建立!");
				result = true;
			}
		} catch (Exception ex) {
			result = false;
			System.out.println("CreateAndDeleteFolder is error:" + ex);
		}
		return result;
	}

	/**
	 * 输出目录中的所有文件及目录名字
	 * 
	 * @param filePath
	 */
	public void readFolderByFile(String filePath) {
		File file = new File(filePath);
		File[] tempFile = file.listFiles();
		for (int i = 0; i < tempFile.length; i++) {
			if (tempFile[i].isFile()) {
				System.out.println("File : " + tempFile[i].getName());
			}
			if (tempFile[i].isDirectory()) {
				System.out.println("Directory : " + tempFile[i].getName());
			}
		}
	}

	/**
	 * 检查文件中是否为一个空
	 * 
	 * @param filePath
	 * @param fileName
	 * @return 为空返回true
	 * @throws IOException
	 */
	public boolean fileIsNull(String filePath, String fileName)
			throws IOException {
		boolean result = false;
		FileReader fr = new FileReader(filePath + fileName);
		if (fr.read() == -1) {
			result = true;
			System.out.println(fileName + " 文件中没有数据!");
		} else {
			System.out.println(fileName + " 文件中有数据!");
		}
		fr.close();
		return result;
	}

	/**
	 * 读取文件中的所有内容
	 * 
	 * @param filePath
	 * @param fileName
	 * @throws IOException
	 */
	public void readAllFile(String filePath, String fileName)
			throws IOException {
		FileReader fr = new FileReader(filePath + fileName);
		int count = fr.read();
		while (count != -1) {
			System.out.print((char) count);
			count = fr.read();
			if (count == 13) {
				fr.skip(1);
			}
		}
		fr.close();
	}

	/**
	 * 一行一行的读取文件中的数据
	 * 
	 * @param filePath
	 * @param fileName
	 * @throws IOException
	 */
	public void readLineFile(String filePath, String fileName)
			throws IOException {
		FileReader fr = new FileReader(filePath + fileName);
		BufferedReader br = new BufferedReader(fr);
		String line = br.readLine();
		while (line != null) {
			System.out.println(line);
			line = br.readLine();
		}
		br.close();
		fr.close();

	}
}