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//在多线程下载的基础上, 多点续传只是在多线程下载的基础上,每次write 之后,把 seek 指针的long 保存下来。保存到文件。 http.setRequestProperty("Range", "bytes="+start+"-"+end); http头属性之一,Range - The first 500 bytes (byte offsets 0-499, inclusive): bytes=0- 499 - The second 500 bytes (byte offsets 500-999, inclusive): bytes=500-999 - The final 500 bytes (byte offsets 9500-9999, inclusive): bytes=-500 - Or bytes=9500- - The first and last bytes only (bytes 0 and 9999): bytes=0-0,-1 - Several legal but not canonical specifications of the second 500 bytes (byte offsets 500-999, inclusive): bytes=500-600,601-999 bytes=500-700,601-999转载地址:http://abegi.baihongyu.com/