javazipoutputstream内存溢出 java outputstream flush

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mob6454cc6f8e48 2023-06-27 12:29:07

文章标签 java inputstream 原理 java python spring linux 文章分类 Java 后端开发

(OutputStream Class flush() method)

flush() method is available in java.io
flush()方法在java.io包中可用。
flush() method
flush()方法用于刷新此OuputStream并强制将输出字节写出任何缓冲区。假设当任何已写入的字节已经由OutputStream的实现缓冲了时，这些字节应立即写入相关目标。
flush() method
flush()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。
flush() method
flush()方法在刷新流时可能会引发异常。
IOException: This exception may throw when getting any input/output error while performing.
IOException

Syntax:

句法：

public void flush();

Parameter(s):

参数：

It does not accept any parameter.
它不接受任何参数。

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 flush() method 
// of OutputStream

import java.io.*;

public class FlushOfOS {
 public static void main(String[] args) throws Exception {
  OutputStream os_stm = null;
  InputStream is_stm = null;
  int val = 65;
  
  try {
   // Instantiates FileOutputStream and 
   // FileInputStream 
   os_stm = new FileOutputStream("D:\\includehelp.txt");
   is_stm = new FileInputStream("D:\\includehelp.txt");

   // Loop to write byte to the stream
   for (int i = 0; i < 3; ++i) {
    os_stm.write(val);
    val++;
   }

   // By using flush() method is to
   // flush the stream
   os_stm.flush();

   // Loop to read byte from the stream
   for (int i = 0; i < 3; ++i) {
    char ch = (char) is_stm.read();
    System.out.println("ch: " + ch);
   }
  } catch (Exception ex) {
   System.out.println("Stream Closed Before...");
  } finally {
   // with the help of this block is to
   // free all necessary resources linked
   // with the stream
   if (is_stm != null) {
    is_stm.close();
    if (os_stm != null) {
     os_stm.close();
    }
   }
  }
 }
}

Output

输出量