java.util.zip.Inflater.needsInput() 方法
描述
如果输入缓冲区中没有数据，java.util.zip.Inflater.needsInput() 方法返回 true。 这可用于确定是否应调用 #setInput 以提供更多输入。
声明
以下是 java.util.zip.Inflater.needsInput() 方法的声明。
public boolean needsInput()
返回值
如果输入缓冲区中没有剩余数据，则为 true。
示例
下面的例子展示了 java.util.zip.Inflater.needsInput() 方法的使用。
package com.tutorialspoint;
import java.io.UnsupportedEncodingException;
import java.util.zip.DataFormatException;
import java.util.zip.Deflater;
import java.util.zip.Inflater;
public class InflaterDemo {
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.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, 10);
byte[] result = new byte[1024];
int resultLength = inflater.inflate(result, 0 , 10);
if(inflater.needsInput()){
inflater.setInput(output, 10, compressedDataLength - resultLength);
resultLength += inflater.inflate(result, resultLength , result.length - resultLength);
}
inflater.end();
// Decode the bytes into a String
message = new String(result, 0, resultLength, "UTF-8");
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 Compressed Message length : 42 UnCompressed Message length : 300
