void setInput(byte[] b)
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2023-12-01
描述 (Description)
java.util.zip.Deflater.setInput(byte[] b)方法设置压缩的输入数据。 只要needsInput()返回true,就会调用此方法,表示需要更多输入数据。
声明 (Declaration)
以下是java.util.zip.Deflater.setInput(byte[] b)方法的声明。
public void setInput(byte[] b)
参数 (Parameters)
b - 输入数据字节。
例子 (Example)
以下示例显示了java.util.zip.Deflater.setInput(byte [] b)方法的用法。
package cn.xnip;
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 xnip.cn;"
+"Welcome to xnip.cn;"
+"Welcome to xnip.cn;"
+"Welcome to xnip.cn;"
+"Welcome to xnip.cn;"
+"Welcome to xnip.cn;"
+"Welcome to xnip.cn;"
+"Welcome to xnip.cn;"
+"Welcome to xnip.cn;"
+"Welcome to xnip.cn;";
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);
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,这将产生以下结果 -
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