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2019-11-14 12:33:48

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hadoop示例代碼

序列化和反序列化 IntWritable writable = new IntWritable(10); ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(); DataOutputStream dataOutputStream = new DataOutputStream(byteArrayOutputStream); writable.write(dataOutputStream); dataOutputStream.close(); byte[] bytes = byteArrayOutputStream.toByteArray(); System.out.PRintln(StringUtils.byteToHexString(bytes)); //解序列化 ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(bytes); DataInputStream input = new DataInputStream(byteArrayInputStream); IntWritable intWritable = new IntWritable(); intWritable.readFields(input); input.close(); System.out.println(intWritable);writable對象的比較 IntWritable int1 = new IntWritable(1); IntWritable int2 = new IntWritable(3); RawComparator<IntWritable> comparator = WritableComparator.get(IntWritable.class); System.out.println(comparator.compare(int1,int2)); //也可以直接比較字節流，不需要反序列化，問題是怎么定位這個字節流呢 System.out.println(comparator.compare(byte[] b1, int s1, int l1, byte[] b2, int s2, int l2));

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