java.util.zip.InflaterInputStream.read(byte[] buf, int off, int len)
方法将未压缩的数据读入一个字节数组。 如果len
不为零,该方法将阻塞,直到某些输入可以被解压; 否则,不读取字节并返回0
。
声明
以下是java.util.zip.InflaterInputStream.read(byte[] buf, int off, int len)
方法的声明。
public int read(byte[] buf, int off, int len)
throws IOException
参数
buf
- 读取数据的缓冲区。off
- 目标数组buf
中的起始偏移量。len
- 读取的最大字节数。
返回值
- 返回读取的实际字节数,如果达到压缩输入的结尾或需要预设字典,则返回
-1
。
异常
IOException
- 如果发生I/O错误。NullPointerException
- 如果buf
是null
。IndexOutOfBoundsException
- 如果off
是负数,len
是负数,或者len
大于buf.length - off
。ZipException
- 如果发生ZIP格式错误。
示例
以下示例显示了java.util.zip.InflaterInputStream.read(byte[] buf, int off, int len)
方法的用法。
package com.yiibai;
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 InflaterInputStreamDemo {
public static void main(String[] args) throws DataFormatException, IOException {
String message = "Welcome to Yiibai.com;"
+"Welcome to Yiibai.com;"
+"Welcome to Yiibai.com;"
+"Welcome to Yiibai.com;"
+"Welcome to Yiibai.com;"
+"Welcome to Yiibai.com;"
+"Welcome to Yiibai.com;"
+"Welcome to Yiibai.com;"
+"Welcome to Yiibai.com;"
+"Welcome to Yiibai.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));
}
}
执行上面示例代码,得到以下结果 -
Original Message length : 300
Total uncompressed bytes input :300
Compressed Message Checksum :368538129
Compressed Message length : 42
true