java.util.zip.GZIPOutputStream.finish()方法完成將壓縮資料寫入輸出流而不關閉底層流。 連續應用多個過濾器到相同的輸出流時使用此方法。
宣告
以下是java.util.zip.GZIPOutputStream.finish()方法的宣告。
public void finish()
throws IOException
異常
IOException - 如果發生I/O錯誤。範例
以下範例顯示了java.util.zip.GZIPOutputStream.finish()方法的用法。
package com.yiibai;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Arrays;
import java.util.zip.DataFormatException;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
public class GZIPOutputStreamDemo {
public static void main(String[] args) throws DataFormatException, IOException {
String message = "Welcome to Tw511.com;"
+"Welcome to Tw511.com;"
+"Welcome to Tw511.com;"
+"Welcome to Tw511.com;"
+"Welcome to Tw511.com;"
+"Welcome to Tw511.com;"
+"Welcome to Tw511.com;"
+"Welcome to Tw511.com;"
+"Welcome to Tw511.com;"
+"Welcome to Tw511.com;";
System.out.println("Original Message length : " + message.length());
byte[] input = message.getBytes("UTF-8");
// Compress the bytes
ByteArrayOutputStream arrayOutputStream = new ByteArrayOutputStream();
GZIPOutputStream outputStream = new GZIPOutputStream(arrayOutputStream);
outputStream.write(input);
outputStream.finish();
outputStream.close();
//Read and decompress the data
byte[] readBuffer = new byte[5000];
ByteArrayInputStream arrayInputStream =
new ByteArrayInputStream(arrayOutputStream.toByteArray());
GZIPInputStream inputStream = new GZIPInputStream(arrayInputStream);
int read = inputStream.read(readBuffer,0,readBuffer.length);
inputStream.close();
//Should hold the original (reconstructed) data
byte[] result = Arrays.copyOf(readBuffer, read);
// Decode the bytes into a String
message = new String(result, "UTF-8");
System.out.println("UnCompressed Message length : " + message.length());
}
}
執行上面範例程式碼，得到以下結果 -
Original Message length : 300
UnCompressed Message length : 300