DataInputStream类以与机器无关的方式从基础输入流中读取原始Java数据类型。 而DataOutputStream类以可移植的方式将原始Java数据类型写入输出流。

下面是一个演示DataInputStreamDataOutputStream使用的示例。

文件:DataInputOutputStreamExample.java -

package com.yiibai.tutorial.io;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

/**
 * @author yiibai 
 * DataInputOutputStreamExample.java 
 * Nov 5, 2016
 */
public class DataInputOutputStreamExample {
    public static void main(String[] args) {
        File file = new File("file.txt");

        /*Write primitive data type to file*/
        FileOutputStream fileOutputStream = null;
        DataOutputStream dataOutputStream = null;
        try {
            fileOutputStream=new FileOutputStream(file);
            dataOutputStream=new DataOutputStream(fileOutputStream);
            dataOutputStream.writeInt(50);
            dataOutputStream.writeDouble(400.25);
            dataOutputStream.writeChar('A');
            dataOutputStream.flush();
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                if(fileOutputStream!=null){
                    fileOutputStream.close();
                }
                if(dataOutputStream!=null){
                    dataOutputStream.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }


        /*Read primitive data type from file*/
        FileInputStream fileInputStream = null;
        DataInputStream dataInputStream = null;
        try {
            fileInputStream = new FileInputStream(file);
            dataInputStream = new DataInputStream(fileInputStream);
            System.out.println(dataInputStream.readInt());
            System.out.println(dataInputStream.readDouble());
            System.out.println(dataInputStream.readChar());
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                if(fileInputStream!=null){
                    fileInputStream.close();
                }
                if(dataInputStream!=null){
                    dataInputStream.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

执行上面示例代码,得到以下结果:

50
400.25
A