数据操作流

在IO包中，提供了两个与平台无关的数据操作流，分别是数据输出流(DataOuputStream)和数据输入流(DataInputStream).

import java.io.DataOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;

//=================================================
// File Name       :	DataOuputStream_demo
//------------------------------------------------------------------------------
// Author          :	Common



//主类
//Function        : 	DataOuputStream_demo;
public class DataOutputStream_demo {

	public static void main(String[] args) throws Exception {
		// TODO 自动生成的方法存根

		DataOutputStream dos = null;			//声明数据输出流对象
		File f = new File("/home/common/software/coding/HelloWord/HelloWord/order.txt");//路径
		dos = new DataOutputStream(new FileOutputStream(f));	//实例化数据输出流对象
		
		String names[] = {"衬衣","手套","围巾"};
		float prices[] = {98.3f,30.0f,50.5f};
		int nums[] = {3,2,1};
		for(int i=0;i<names.length;i++){	//循环写入
			dos.writeChars(names[i]);			//写入字符串
			dos.writeChar('	'); 					//加入分隔符
			dos.writeFloat(prices[i]);			//写入字符串
			dos.writeChar('	'); 					//加入分隔符
			dos.writeInt(nums[i]);					//写入字符串
			dos.writeChar('	'); 					//加入分隔符
		}
		dos.close();
	}

}

 

读取数据

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

//=================================================
// File Name       :	DataInputStream_demo
//------------------------------------------------------------------------------
// Author          :	Common



//主类
//Function        : 	DataInputStream_demo;
public class DataInputStream_demo {

	public static void main(String[] args) throws Exception {
		// TODO 自动生成的方法存根

		DataInputStream dis = null;			//声明数据输出流对象
		File f = new File("/home/common/software/coding/HelloWord/HelloWord/order.txt");//路径
		dis = new DataInputStream(new FileInputStream(f));	//实例化数据输出流对象
		
		String name = null;
		float price = 0.0f;
		int num = 0;
		char temp[] = null;
		char c = 0;									//存放接收的字符
		int len = 0;									//接收的字符的个数
		try{
			while(true){
				temp = new char[200];
				len = 0;
				while((c=dis.readChar()) != '	'){	//读取字符
					temp[len] = c;								//接收内容
					len++;											//读取长度加1
				}		
				name = new String(temp,0,len);	//将字符数组变成String
				price = dis.readFloat();					//读取float
				dis.readChar();								//读取	
				num = dis.readInt();						//读取int
				dis.readChar();								//读取

				System.out.printf("名称：%s,名称：%5.2f,名称：%d
",name,price,num);
			}
		}catch(Exception e){
			e.printStackTrace();
		}
		dis.close();
	}

}