Java IO流->处理流->数据流：DataOutputStream&DataInputStream

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图一：

示例代码：

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 org.junit.Test;public class TestPrintStreamWriter {/** * 数据流：用来处理基本的数据类型、String、字节数组的数据DataOutputStream & DataInputStream *///DataOutputStream@Testpublic void test2() {DataOutputStream dos = null;try {FileOutputStream fos = new FileOutputStream("data.txt");dos = new DataOutputStream(fos);dos.writeUTF("从前从前，有个人，爱你很久，但风偏偏雨渐渐把距离吹得好远，好不容易又能多爱你一天，但是故事的最后，你还是说了，拜拜。");/*dos.writeBoolean(true);dos.writeLong(3456789);*/} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} finally {if(dos != null) {try {dos.close();} catch (IOException e) {e.printStackTrace();}}}}@Testpublic void test3() {DataInputStream dis = null;try {dis = new DataInputStream(new FileInputStream("data.txt"));//错误方式：/*byte[] b = new byte[20];int len;while((len = dis.read(b)) != -1) {System.out.println(new String(b , 0 , len));}*/String str = dis.readUTF();System.out.println(str);/*boolean b = dis.readBoolean();System.out.println(b);long l = dis.readLong();System.out.println(l);*/} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} finally {if(dis != null) {try {dis.close();} catch (IOException e) {e.printStackTrace();} }}}}

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