TestIO

package com.djwl.test.studying;

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Writer;
import java.util.ArrayList;
import java.util.List;

import javax.swing.filechooser.FileSystemView;

import com.djwl.core.MisException;

/**
 * Description: <br>
 * 2010-3-31
 * 
 * @author huxiao [e-mail]
 */
public class TestIO {
	/**
	 * description: 返回windows当前桌面的路径<br>
	 * 
	 * @return Mar 22, 2010
	 * @author huxiao [e-mail]
	 */
	public static String getDeskPath() {
		return FileSystemView.getFileSystemView().getHomeDirectory().toString() + File.separator;
	}

	public static String getWebRootPath() {
		return ClassLoader.getSystemClassLoader().getResource("").toString().replace("file:/", "").replace("/WEB-INF/classes/", "");
	}

	/**
	 * description: 把传过来的字符串生成为text文件<br>
	 * 
	 * @param str
	 *            Mar 22, 2010
	 * @author huxiao [e-mail]
	 */
	public static void createTextFileByStream(String str) {
		try {
			FileOutputStream fos = new FileOutputStream(new File(getDeskPath() + "test.createTextFileByStream.txt"));
			DataOutputStream dos = new DataOutputStream(fos);
			dos.writeBytes(str);
		} catch (FileNotFoundException e) {
			// TODO: handle exception
		} catch (IOException e) {
			// TODO: handle exception
		}
	}

	/**
	 * description: 把传过来的字符串生成为text文件<br>
	 * 
	 * @param str
	 *            Mar 22, 2010
	 * @author huxiao [e-mail]
	 */
	public static void createTextFileByWriter(String str) {
		try {
			Writer writer = new FileWriter(new File(getDeskPath() + "test.createTextFileByWriter.txt"));
			writer.write(str);
			writer.flush();
			writer.close();
		} catch (IOException e) {
			// TODO: handle exception
		}
	}

	/**
	 * description: 获取当前类路径<br>
	 * 
	 * @return Mar 22, 2010
	 * @author huxiao [e-mail]
	 */
	public static String getBasePath() {
		String path = ClassLoader.getSystemResource("").toString().replace("file:/", "").replace("/WEB-INF/classes/", "");
		;
		return path;
	}

	/**
	 * description: 按行读取文件<br>
	 * Mar 22, 2010
	 * 
	 * @author huxiao [e-mail]
	 */
	public static void readFileByLine() {
		List<String> list = new ArrayList<String>();
		try {
			String filepath = getWebRootPath() + "/test/1.txt";
			FileReader reader = new FileReader(filepath);
			BufferedReader br = new BufferedReader(reader);
			String s1 = null;
			while ((s1 = br.readLine()) != null) {
				list.add(s1);
			}
			br.close();
			reader.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		System.out.println(list.size() + "" + list);
	}

	/**
	 * description: 输入流读取文件<br>
	 * Mar 22, 2010
	 * 
	 * @author huxiao [e-mail]
	 */
	public static void readFileByInputStream() {
		String filepath = getWebRootPath() + "/test/test.txt";
		FileInputStream fis = null;
		File file = new File(filepath);
		try {
			fis = new FileInputStream(file);
			byte[] b = new byte[(int) file.length()];
			while (fis.read(b) != -1) {
			}
			System.out.println(new String(b));
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	/**
	 * 功能描述：创建path目录及其父目录<BR>
	 * 
	 * @param path
	 * @author 胡晓<BR>
	 *         时间：2009-10-22 下午05:01:33<BR>
	 */
	public static void createFolder(String path) {
		File file = new File(path);
		if (!file.exists()) {
			file.mkdirs();
		}
	}

	/**
	 * 功能描述：把filename从from文件夹移动到to文件夹<BR>
	 * 
	 * @param from
	 * @param to
	 * @author 胡晓<BR>
	 *         时间：2009-10-22 下午05:08:21<BR>
	 */
	public static void moveFile(String from, String to, String filename) {
		createFolder(to);
		File file = new File(from, filename);
		if (file.isFile()) {
			System.out.println("移动" + filename);
			file.renameTo(new File(to, file.getName()));
		} else {
			System.out.println(filename + "不存在");
		}
	}

	/**
	 * description: 其他零碎的<br>
	 * 
	 * @param args
	 *            Mar 22, 2010
	 * @author huxiao [e-mail]
	 */
	public static void main(String[] args) {
		File file = new File("");

		// move file or rename file
		file.renameTo(new File("this is a new file with a new fileName"));

		// 判断文件或目录是否存在，文件和目录都是true
		if (file.exists()) {

		}

		// 判断文件是否存在,文件时true，目录是false
		if (file.isFile()) {

		}

		System.out.println(getWebRootPath());

		// 获取桌面路径
		System.out.println(FileSystemView.getFileSystemView().getHomeDirectory());
		// 获取我的文档路径
		System.out.println(FileSystemView.getFileSystemView().getDefaultDirectory());
		// 获取webroot绝对路径，可以在static method中使用
		System.out.println(ClassLoader.getSystemResource(""));
		// 获取webroot绝对路径，在非static method中可使用this
		System.out.println(new Backup().getClass().getClassLoader().getResource(""));
		// 获取类的绝对路径，在非static method中可使用this
		System.out.println(new Backup().getClass().getResource(""));
	}

	/**
	 * 功能描述：删除单个文件<BR>
	 * 
	 * @param file
	 * @author:杨凯<BR>
	 *            时间：Apr 16, 2009 1:55:11 PM<BR>
	 */
	public static void deleteFile(File file) {
		file.delete();
	}

	/**
	 * 功能描述：删除目录，并删除该目录下的所有文件<BR>
	 * 
	 * @param dir
	 * @return
	 * @author:杨凯<BR>
	 *            时间：Apr 16, 2009 1:55:21 PM<BR>
	 */
	public static boolean deleteDirectory(File dir) {
		if ((dir == null) || !dir.isDirectory()) {
			throw new MisException("要删除的目录不存在，或者不是目录");
		}

		File[] files = dir.listFiles();
		int sz = files.length;

		for (int i = 0; i < sz; i++) {
			if (files[i].isDirectory()) {
				if (!deleteDirectory(files[i])) {
					return false;
				}
			} else {
				if (!files[i].delete()) {
					return false;
				}
			}
		}

		if (!dir.delete()) {
			return false;
		}
		return true;
	}

}

★、节点流类型


★、处理流类型