Java 中的 Java.util.zip .平减计算机流类
原文:https://www . geeksforgeeks . org/Java-util-zip-通缩计算机流-class-java/
实现一个输入流过滤器，用于以“deflate”压缩格式压缩数据。
构造函数和描述
- Reduce the input stream in: Create a new input stream using the default compressor and buffer size.
- InputStream in (Defl): Create a new input stream with the specified compressor and default buffer size.
- InputStream in (pincher defl, int buflen): Create a new input stream with the specified compressor and buffer size.
方法:
-
int available (): Return 0 after reaching EOF, otherwise always return 1.
java Syntax :public int available() throws IOException Parameters: n - number of bytes to be skipped Returns: the actual number of bytes skipped Throws: IOException -
void close(): Close this input stream and its underlying input stream, and discard any pending uncompressed data.
java Syntax :public void close() throws IOException Overrides: close in class FilterInputStream Throws: IOException -
Invalid flag (intlimit): This operation is not supported.
```java Syntax :public void mark(int limit) Parameters: limit - maximum bytes that can be read before invalidating the position marker
```
-
Boolean marksupported (): always returns false because this input stream does not support the mark () and reset () methods.
java Syntax :public boolean markSupported() Returns: false, always -
intread (): Read compressed data of a single byte from the input stream.
java Syntax :public int read() throws IOException Returns: a single byte of compressed data, or -1 if the end of the uncompressed input stream is reached Throws: IOException -
int read (byte [] b, int off, int len): Read compressed data into byte array.
java Syntax :public int read(byte[] b, int off, int len) throws IOException Parameters: b - buffer into which the data is read off - starting offset of the data within b len - maximum number of compressed bytes to read into b Returns: the actual number of bytes read, or -1 if the end of the uncompressed input stream is reached Throws: IndexOutOfBoundsException IOException -
Invalid reset (): This operation is not supported.
java Syntax :public void reset() throws IOException Throws: IOException -
Long skip (length n): Skip and discard the data in the input stream.
java Syntax :public long skip(long n) throws IOException Parameters: n - number of bytes to be skipped Returns: the actual number of bytes skipped Throws: IOExceptionT42
程序:
//Java program to illustrate DeflaterInputStream class
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.zip.DeflaterInputStream;
class DeflaterInputStreamDemo
{
public static void main(String[] args) throws IOException
{
byte b[] = new byte[10];
for (byte i = 0; i <10 ; i++)
{
b[i] = i;
}
ByteArrayInputStream bin = new ByteArrayInputStream(b);
DeflaterInputStream din = new DeflaterInputStream(bin);
//illustrating markSupported() method
System.out.println(din.markSupported());
//illustrating skip() method
din.skip(1);
//illustrating available() method
System.out.println(din.available());
//illustrating read(byte[] b,int off,int len)
byte c[] = new byte[10];
din.read(c,0,9);
for (int i = 0; i < 9; i++)
{
System.out.print(c[i]);
}
while(din.available() == 1)
{
//Reads a single byte of compressed data
System.out.print(din.read());
}
System.out.println();
System.out.println(din.available());
// illustrating close() method
din.close();
}
}
输出:
false
1
-1009996100981029710199231224400175046-1
0
上述输出代表压缩数据。
下一篇: Java 中的 Java . util . zip . pinteroutputstream 类
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