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1. å建HttpClient对象ã
2. å建请æ±æ¹æ³çå®ä¾ï¼å¹¶æå®è¯·æ±URLãå¦æéè¦åéGET请æ±ï¼å建HttpGet对象ï¼å¦æéè¦åéPOST请æ±ï¼å建HttpPost对象ã
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