java.util.zip.Deflater.deflate(byte[] b, int off, int len)方法压缩输入数据并用压缩数据填充指定的缓冲区。 返回压缩数据的实际字节数。 返回值为0表示需要调用needsInput以确定是否需要更多输入数据。
声明
以下是java.util.zip.Deflater.deflate(byte[] b, int off, int len)方法的声明。
public int deflate(byte[] b, int off, int len)
参数
b- 压缩数据的缓冲区。off- 数据的起始偏移量。len- 压缩数据的最大字节数。
返回值
- 写入输出缓冲区的压缩数据的实际字节数。
示例
以下示例显示了java.util.zip.Deflater.deflate(byte[] b, int off, int len)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.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());
}
}
执行上面示例代码，得到以下结果 -
Original Message length : 300
Compressed Message length : 42
UnCompressed Message length : 300