java代码----------实现创建DataInputStream和DataOutputStream进行读写

总结： 主要是 捕获异常

package com.a.b;

import java.io.*;

public class testData {
	public static void main(String[] args) throws IOException {
		File newDir = new File("c:\javas");
		if (!newDir.exists()) {
			newDir.mkdir();// 如果目录不存在，就创建目录

			File newFile = new File(newDir, "test.txt");
			try {
				newFile.createNewFile();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}// 创建文件对象
				// 建立DataInputStream 流
			DataOutputStream dos = null;
			try {
				dos = new DataOutputStream(new FileOutputStream(newFile));
			} catch (FileNotFoundException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}
			try {
				dos.writeInt(10);
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}// 写入整型数据m
			dos.writeBoolean(true);// 写入boolean型数据
			dos.writeFloat(23.2f);// 写入浮点型double型
			dos.writeChars("writeen into file");// 写入字符串
			dos.close();
			System.out.println("LIST ths file content");
			// 建立DataInputStream流
			DataInputStream dis = new DataInputStream(new FileInputStream(
					newFile));
			System.out.println(dis.readChar());
			System.out.println(dis.readInt());
			System.out.println(dis.readBoolean());
			char c;
			while ((c = dis.readChar()) != -1) {
				System.out.println(c);// 读取字符串
				dis.close();
			}

		}

	}
}