DataOutputStream类writeByte()方法 (DataOutputStream Class writeByte() method)

• writeByte() method is available in java.io package.

  writeByte()方法在java.io包中可用。

• writeByte() method is used to write the given value as one-byte value to the basic stream and the variable counter is plus by 1 on successful execution.

  writeByte()方法用于将给定值作为一字节值写入基本流，并且成功执行时变量计数器加1。

• writeByte() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  writeByte()方法是一种非静态方法，只能通过类对象访问，如果尝试使用类名称访问该方法，则会收到错误消息。

• writeByte() method may throw an exception at the time of writing byte.

  writeByte()方法在写入字节时可能会引发异常。

  IOException: This exception may throw while getting any input/output error.

  IOException ：在获取任何输入/输出错误时，可能引发此异常。

Syntax:

句法：

    public final void writeByte(int val);

Parameter(s):

参数：

• int val – represents the byte value to be written to the basic data output stream.

  int val –表示要写入基本数据输出流的字节值。

Return value:

返回值：

The return type of the method is void, it returns nothing.

该方法的返回类型为void ，不返回任何内容。

Example:

例：

// Java program to demonstrate the example
// of void writeByte(int val) method
// of DataOutputStream
import java.io.*;
public class WriteByteOfDOS {public static void main(String[] args) throws Exception {ByteArrayOutputStream baos_stm = null;
DataOutputStream dos_stm = null;
byte[] b_arr = {10,
20,
30,
40,
50
};
try {// Instantiates ByteArrayOutputStream, DataOutputStream
baos_stm = new ByteArrayOutputStream();
dos_stm = new DataOutputStream(baos_stm);
for (byte val: b_arr) {// By using writeByte() method isto write
// byte value from the given byte array
// to the dos_stm stream
dos_stm.writeByte(val);
}
// By using flush() method isto
// flush output bytes are written out
// to the basic output stream
dos_stm.flush();
// By using toByArray() method isto
// convert the stream baos_stm to byte
// array
byte[] by = baos_stm.toByteArray();
// Loop to display each byte to the
// baos_stm data till its end
for (byte val: by) {// Display byte
System.out.println("dos_stm.writeByte(): " + val);
}
} catch (Exception ex) {System.out.println(ex.toString());
} finally {// this block is to free all necessary system
// resources linked with the stream
if (baos_stm != null)
baos_stm.close();
if (dos_stm != null)
dos_stm.close();
}
}
}

Output

输出量

dos_stm.writeByte(): 10
dos_stm.writeByte(): 20
dos_stm.writeByte(): 30
dos_stm.writeByte(): 40
dos_stm.writeByte(): 50

翻译自: https://www.includehelp.com/java/dataoutputstream-writebyte-method-with-example.aspx