java.util.zip.Deflater.setLevel() 方法
描述
java.util.zip.Deflater.setLevel(int level) 方法将当前压缩级别设置为指定值。
声明
以下是 java.util.zip.Deflater.setLevel(int level) 方法的声明。
public void setLevel(int level)
参数
level − 新的压缩级别 (0-9)。
异常
IllegalArgumentException − 如果压缩级别无效。
示例
以下示例展示了 java.util.zip.Deflater.setLevel(int level) 方法的用法。
package com.tutorialspoint;
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 TutorialsPoint.com;"
+"Welcome to TutorialsPoint.com;"
+"Welcome to TutorialsPoint.com;"
+"Welcome to TutorialsPoint.com;"
+"Welcome to TutorialsPoint.com;"
+"Welcome to TutorialsPoint.com;"
+"Welcome to TutorialsPoint.com;"
+"Welcome to TutorialsPoint.com;"
+"Welcome to TutorialsPoint.com;"
+"Welcome to TutorialsPoint.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.setLevel(Deflater.DEFAULT_COMPRESSION);
deflater.setInput(input);
deflater.finish();
int compressedDataLength = deflater.deflate(output,0 , output.length, Deflater.NO_FLUSH);
System.out.println("Total uncompressed bytes output :" + deflater.getTotalOut());
System.out.println("Compressed Message Checksum :" + deflater.getAdler());
deflater.finished();
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.finished();
// Decode the bytes into a String
message = new String(result, 0, resultLength, "UTF-8");
System.out.println("UnCompressed Message Checksum :" + inflater.getAdler());
System.out.println("UnCompressed Message length : " + message.length());
}
}
让我们编译并运行上面的程序，这将产生下面的结果 −
Original Message length : 300 Total uncompressed bytes output :42 Compressed Message Checksum :368538129 Compressed Message length : 42 UnCompressed Message Checksum :368538129 UnCompressed Message length : 300
