Java 中的 BufferedOutputStream flush()方法，示例

原文:https://www . geeksforgeeks . org/bufferedoutstream-flush-in-Java-method-with-examples/

Java 中bufferedoutstream类的 flush() 方法用于刷新缓冲的输出流。此方法用于强制将缓冲输出的字节写入主输出流。

语法:

public void flush() 
            throws IOException

指定者:该方法由可冲洗界面的冲洗()方法指定。

覆盖:该方法覆盖 FilterOutputStream 类中的 flush() 方法。

参数:此方法不接受任何参数。

返回值:此方法不返回值。

异常:如果出现输入输出错误，该方法抛出异常。

下面的程序说明了 IO 包中 BufferedOutputStream 类中的 flush()方法:

程序 1:

// Java program to illustrate
// BufferedOutputStream flush() method
import java.io.*;
public class GFG {
    public static void main(String[] args) throws Exception
    {

        // Create byteArrayOutputStream
        ByteArrayOutputStream
            byteArrayOutStr
            = new ByteArrayOutputStream();

        // Convert outputStream to
        // bufferedInputStream
        BufferedOutputStream buffOutputStr
            = new BufferedOutputStream(
                byteArrayOutStr);

        // Creating byte array
        byte b[] = { 71, 69, 69, 75, 83 };
        buffOutputStr.write(b);

        // flush is called
        // to compel bytes to be
        // written out to buffOutputStr
        buffOutputStr.flush();

        for (byte by : byteArrayOutStr
                           .toByteArray()) {

            // Converts byte to character
            char ch = (char)by;
            System.out.print(ch);
        }
    }
}

Output:

GEEKS

程序 2:

// Java program to illustrate
// BufferedOutputStream flush() method
import java.io.*;
public class GFG {
    public static void main(String[] args) throws Exception
    {

        // Create byteArrayOutputStream
        ByteArrayOutputStream byteArrayOutStr = new ByteArrayOutputStream();

        // Convert outputStream to
        // bufferedInputStream
        BufferedOutputStream buffOutputStr
            = new BufferedOutputStream(
                byteArrayOutStr);

        // Creating first byte array
        byte b1[] = { 71, 69, 69, 75, 83 };
        buffOutputStr.write(b1);

        // flush is called
        // to compel bytes to be
        // written out to buffOutputStr
        buffOutputStr.flush();

        // Creating second byte array
        byte b2[] = { 70, 79, 82 };
        buffOutputStr.write(b2);

        buffOutputStr.flush();

        buffOutputStr.write(b1);

        buffOutputStr.flush();

        for (byte by : byteArrayOutStr.toByteArray()) {
            // Converts byte to character
            char ch = (char)by;
            System.out.print(ch);
        }
    }
}

Output:

GEEKSFORGEEKS

参考文献: https://docs . Oracle . com/javase/10/docs/API/Java/io/bufferedoutputstream . html # flush()

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