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
