📅 最后修改于: 2020-09-27 02:38:18 🧑 作者: Mango
Java DataInputStream类允许应用程序以独立于机器的方式从输入流中读取原始数据。
Java应用程序通常使用数据输出流来写入数据，以后可以由数据输入流读取。
让我们看一下java.io.DataInputStream类的声明：
public class DataInputStream extends FilterInputStream implements DataInput
| Method | Description |
|---|---|
| int read(byte[] b) | It is used to read the number of bytes from the input stream. |
| int read(byte[] b, int off, int len) | It is used to read len bytes of data from the input stream. |
| int readInt() | It is used to read input bytes and return an int value. |
| byte readByte() | It is used to read and return the one input byte. |
| char readChar() | It is used to read two input bytes and returns a char value. |
| double readDouble() | It is used to read eight input bytes and returns a double value. |
| boolean readBoolean() | It is used to read one input byte and return true if byte is non zero, false if byte is zero. |
| int skipBytes(int x) | It is used to skip over x bytes of data from the input stream. |
| String readUTF() | It is used to read a string that has been encoded using the UTF-8 format. |
| void readFully(byte[] b) | It is used to read bytes from the input stream and store them into the buffer array. |
| void readFully(byte[] b, int off, int len) | It is used to read len bytes from the input stream. |
在此示例中，我们正在从文件testout.txt文件中读取数据。
package com.javatpoint;
import java.io.*;
public class DataStreamExample {
public static void main(String[] args) throws IOException {
InputStream input = new FileInputStream("D:\\testout.txt");
DataInputStream inst = new DataInputStream(input);
int count = input.available();
byte[] ary = new byte[count];
inst.read(ary);
for (byte bt : ary) {
char k = (char) bt;
System.out.print(k+"-");
}
}
}
在这里，我们假设您在“ testout.txt”文件中包含以下数据：
JAVA
输出：
J-A-V-A