java之DataInputStream和DataOutputStream

DataInputStream和DataOutputStream，是用来读写基本数据类型的，而且，读写顺序要一致。

测试代码：

package com.io;

import java.io.Closeable;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;

import junit.framework.TestCase;

import static java.lang.System.out;

public class TestDataStream extends TestCase {
	private static final String FILE_PATH = "C:/TestDataStream.txt";
	private static final String STR = "hello";

	public void testDataOutputStream() {
		DataOutputStream dos = null;
		FileOutputStream fos = null;

		try {
			fos = new FileOutputStream(FILE_PATH);
			dos = new DataOutputStream(fos);
			dos.writeInt(1);
			dos.writeChar('c');
			dos.writeChars(STR);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			close(dos);
			close(fos);
		}
	}

	public void testDataInputStream() {
		DataInputStream dis = null;
		FileInputStream fis = null;

		try {
			fis = new FileInputStream(FILE_PATH);
			dis = new DataInputStream(fis);
			out.println(dis.readInt());
			out.println(dis.readChar());
			for (int i = 0; i < STR.length(); i++) {
				out.print(dis.readChar());
			}
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			close(dis);
			close(fis);
		}
	}

	private void close(Closeable closeable) {
		if (closeable != null) {
			try {
				closeable.close();
				closeable = null;
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
}