DataInputStream & DataOutputStream;

 

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

public class DataStream {
    public static void main(String[] args) throws IOException {
        DataOutputStream out = new DataOutputStream(new FileOutputStream(
                "Java2s.txt"));

        double[] prices = { 19.99, 9.99, 15.99, 3.99, 4.99 };
        int[] units = { 12, 8, 13, 29, 50 };
        String[] descs = { "Java", "Source", "and", "Support" , "last"};
        byte[] data = new byte[4];
        
        for (int i = 0; i < 4; i++)
        {
            data[i] = 101;
        }

        for (int i = 0; i < prices.length; i++) {
            out.writeDouble(prices[i]);
            out.writeChar('\t');
            out.writeInt(units[i]);
            out.writeChar('\t');
            out.write(data, 0, 4);
            out.writeChar('\t');
            out.writeUTF(descs[i]);
        }
        out.close();

        // read it in again
        DataInputStream in = new DataInputStream(new FileInputStream(
                "Java2s.txt"));

        double price;
        int unit;
        String desc;
        double total = 0.0;
        byte[] outdata = new byte[4];

        try {
            while (true) {
                price = in.readDouble();
                in.readChar(); // throws out the tab
                unit = in.readInt();
                in.readChar(); // throws out the tab
                int r = in.read(outdata);
                in.readChar(); // throws out the tab
                desc = in.readUTF();
                
                System.out.println(price);
                System.out.println(unit);
                System.out.println(desc);
                for (int i=0; i<4; i++)
                {
                    System.out.println(" " + (byte)outdata[i]);
                }
                total = total + unit * price;
            }
        } catch (EOFException e) {}
        in.close();
    }
}
DataInputStreamDataOutputStreamJava中用于读取和写入基本数据类型的流。它们是InputStream和OutputStream的子类,并且基于父类DataInput和DataOutput。这两个类用于对机器可读的文件进行读写操作,而不是给人类阅读的。DataInputStream只能读取由DataOutputStream写出的文件。\[1\] 使用BufferedInputStream/BufferedOutputStream读写的并不是纯二进制数据,因此在某些情况下,比如网络传输时,可能会出现文件无法恢复的问题,除非是纯文本文件。为了解决文件流的通用性,我们可以使用DataInputStream/DataOutputStream以纯二进制的方式进行读写。DataInputStreamDataOutputStream可以被认为是更高级的类,需要与其他InputStream进行组合使用,通常建议使用带缓冲的流,如BufferedInputStream。\[2\] DataInputStreamDataOutputStream提供了一系列方法来读取和写入八种基本数据类型,以及字符串。这些方法可以保持数据类型的一致性,非常适合在网络上传输基本类型数据和字符串。\[3\] 需要注意的是,数据流属于处理流,必须与节点流一起使用,并且在读取和存储数据时的顺序必须一致,否则读取的数据可能会失真。 #### 引用[.reference_title] - *1* [DataInputStreamDataOutputStream流](https://blog.csdn.net/weixin_43808717/article/details/115068980)[target=&quot;_blank&quot; data-report-click={&quot;spm&quot;:&quot;1018.2226.3001.9630&quot;,&quot;extra&quot;:{&quot;utm_source&quot;:&quot;vip_chatgpt_common_search_pc_result&quot;,&quot;utm_medium&quot;:&quot;distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^insertT0,239^v3^insert_chatgpt&quot;}} ] [.reference_item] - *2* [datainputstreamdataoutputstream](https://blog.csdn.net/m0_46301469/article/details/106105129)[target=&quot;_blank&quot; data-report-click={&quot;spm&quot;:&quot;1018.2226.3001.9630&quot;,&quot;extra&quot;:{&quot;utm_source&quot;:&quot;vip_chatgpt_common_search_pc_result&quot;,&quot;utm_medium&quot;:&quot;distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^insertT0,239^v3^insert_chatgpt&quot;}} ] [.reference_item] - *3* [数据流: DataInputStreamDataOutputStream](https://blog.csdn.net/weixin_30436891/article/details/99150359)[target=&quot;_blank&quot; data-report-click={&quot;spm&quot;:&quot;1018.2226.3001.9630&quot;,&quot;extra&quot;:{&quot;utm_source&quot;:&quot;vip_chatgpt_common_search_pc_result&quot;,&quot;utm_medium&quot;:&quot;distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^insertT0,239^v3^insert_chatgpt&quot;}} ] [.reference_item] [ .reference_list ]
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