java.util.zip.Deflater.deflate(byte[] b, int off, int len, int flush)方法壓縮輸入數據並用壓縮數據填充指定的緩衝區。 返回壓縮數據的實際位元組數。
聲明
以下是java.util.zip.Deflater.deflate(byte[] b, int off, int len, int flush)方法的聲明。
public int deflate(byte[] b, int off, int len, int flush)
參數
b- 壓縮數據的緩衝區。off- 數據的起始偏移量。len- 壓縮數據的最大字節數。flush- 壓縮緩衝模式。
返回值
- 寫入輸出緩衝區的壓縮數據的實際位元組數。
示例
以下示例顯示了java.util.zip.Deflater.deflate(byte[] b, int off, int len, int flush)方法的用法。
package com.zaixian;
import java.io.UnsupportedEncodingException;
import java.util.zip.DataFormatException;
import java.util.zip.Deflater;
import java.util.zip.Inflater;
public class DeflaterDemo {
public static void main(String[] args)
throws DataFormatException, UnsupportedEncodingException {
String message = "Welcome to zaixianPoint.com;"
+"Welcome to zaixianPoint.com;"
+"Welcome to zaixianPoint.com;"
+"Welcome to zaixianPoint.com;"
+"Welcome to zaixianPoint.com;"
+"Welcome to zaixianPoint.com;"
+"Welcome to zaixianPoint.com;"
+"Welcome to zaixianPoint.com;"
+"Welcome to zaixianPoint.com;"
+"Welcome to zaixianPoint.com;";
System.out.println("Original Message length : " + message.length());
byte[] input = message.getBytes("UTF-8");
// 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);
deflater.end();
System.out.println("Compressed Message length : " + compressedDataLength);
// Decompress the bytes
Inflater inflater = new Inflater();
inflater.setInput(output, 0, compressedDataLength);
byte[] result = new byte[1024];
int resultLength = inflater.inflate(result);
inflater.end();
// Decode the bytes into a String
message = new String(result, 0, resultLength, "UTF-8");
System.out.println("UnCompressed Message length : " + message.length());
}
}
執行上面示例代碼，得到以下結果 -
Original Message length : 300
Compressed Message length : 42
UnCompressed Message length : 300