DataOutputStream类的writeUTF()方法 (DataOutputStream Class writeUTF() method)

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

  writeUTF()方法在java.io包中可用。

• writeUTF() method is used to write the given string value to the basic data output stream with the help of updated encoding scheme UTF-8.

  writeUTF()方法用于借助更新的编码方案UTF-8将给定的字符串值写入基本数据输出流。

• writeUTF() 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.

  writeUTF()方法是一个非静态方法，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。

• writeUTF() method may throw an exception at the time of representing encoding scheme.

  在表示编码方案时， writeUTF()方法可能会引发异常。

  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 writeUTF(String val);

Parameter(s):

参数：

• String val – represents the string value to be written to the data output stream.

  字符串val –表示要写入数据输出流的字符串值。

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 writeUTF(String val) method 
// of DataOutputStream
import java.io.*;
public class WriteUTFOfDOS {
public static void main(String[] args) throws Exception {
InputStream is_stm = null;
DataInputStream dis_stm = null;
FileOutputStream fos_stm = null;
DataOutputStream dos_stm = null;
String[] str_arr = {
"Java",
"World!!!"
};
try {
// Instantiate FileInputStream, 
// DataInputStream, FileOutputStream
// and DataOutputStream 
fos_stm = new FileOutputStream("C:\\Users\\Preeti Jain\\Desktop\\programs\\includehelp.txt");
dos_stm = new DataOutputStream(fos_stm);
is_stm = new FileInputStream("C:\\Users\\Preeti Jain\\Desktop\\programs\\includehelp.txt");
dis_stm = new DataInputStream(is_stm);
for (String val: str_arr) {
// By using writeUTF() method isto
// write string value to the
// DataOutputStream dos_stm as
// encrypted in modified UTF-8
// encoding scheme
dos_stm.writeUTF(val);
}
// By using flush() method isto
// flush the bytes to the basic 
// output stream         
dos_stm.flush();
// Loop To Read Available Data till end
while (dis_stm.available() > 0) {
// By using readUTF() method isto read 
// str_arr from dis_stm as encrypted in
// modified UTF-8 scheme
String val = dis_stm.readUTF();
System.out.println("dos_stm.writeUTF(val): " + val);
}
} catch (Exception ex) {
System.out.println(ex.toString());
} finally {
// To free system resources linked
// with these streams
if (is_stm != null)
is_stm.close();
if (dis_stm != null)
dis_stm.close();
if (dos_stm != null)
dos_stm.close();
if (fos_stm != null)
fos_stm.close();
}
}
}

Output

输出量

dos_stm.writeUTF(val): Java
dos_stm.writeUTF(val): World!!!

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