int read(byte[] b, int off, int len)
描述 (Description)
java.util.zip.DeflaterInputStream.read(byte[] b, int off, int len)方法从输入流中读取单个字节的压缩数据。 此方法将阻塞，直到可以读取和压缩某些输入。
声明 (Declaration)
以下是java.util.zip.DeflaterInputStream.read(byte[] b, int off, int len)方法的声明。
public int read(byte[] b, int off, int len)
throws IOException
参数 (Parameters)
b - 读取数据的缓冲区。
off - b内数据的起始偏移量。
len - 要读入的最大压缩字节数b。
返回值 (Returns)
读取的实际字节数，如果到达未压缩输入流的末尾，则返回-1。
异常 (Exceptions)
IndexOutOfBoundsException - 如果len“b.length - off。
IOException - 如果发生I/O错误或此流已关闭。
例子 (Example)
以下示例显示了java.util.zip.DeflaterInputStream.read（byte [] b，int off，int len）方法的用法。
package com.iowiki;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.util.zip.DataFormatException;
import java.util.zip.Deflater;
import java.util.zip.InflaterInputStream;
public class DeflaterInputStreamDemo {
public static void main(String[] args) throws DataFormatException, IOException {
String message = "Welcome to iowiki.com;"
+"Welcome to iowiki.com;"
+"Welcome to iowiki.com;"
+"Welcome to iowiki.com;"
+"Welcome to iowiki.com;"
+"Welcome to iowiki.com;"
+"Welcome to iowiki.com;"
+"Welcome to iowiki.com;"
+"Welcome to iowiki.com;"
+"Welcome to iowiki.com;";
System.out.println("Original Message length : " + message.length());
byte[] input = message.getBytes("UTF-8");
int length = message.length();
// Compress the bytes
byte[] output = new byte[1024];
Deflater deflater = new Deflater();
deflater.setInput(input);
deflater.finish();
int compressedDataLength = deflater.deflate(output,0 , output.length, Deflater.NO_FLUSH);
System.out.println("Total uncompressed bytes input :" + deflater.getTotalIn());
System.out.println("Compressed Message Checksum :" + deflater.getAdler());
deflater.finished();
System.out.println("Compressed Message length : " + compressedDataLength);
ByteArrayInputStream bin = new ByteArrayInputStream(output);
InflaterInputStream inflaterInputStream = new InflaterInputStream(bin);
byte[] result = new byte[1024];
inflaterInputStream.read(result,0,result.length);
inflaterInputStream.close();
// Decode the bytes into a String
String message1 = new String(result,0, length,"UTF-8");
System.out.println(message.equals(message1));
}
}
让我们编译并运行上面的程序，这将产生以下结果 -
Original Message length : 300
Total uncompressed bytes input :300
Compressed Message Checksum :368538129
Compressed Message length : 42
true
