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為什么doPost會(huì)拋空指針的異常

Exception in thread "main" java.lang.NullPointerException

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1 回答

public?static?JSONObject?doPost(String?url,String?outUrl){
		JSONObject?jsonObject=null;
		CloseableHttpClient?httpClient?=?HttpClients.createDefault();
		HttpPost?httpPost?=?new?HttpPost();
		httpPost.setEntity(new?StringEntity(outUrl,"UTF-8"));
		URI?uri?=?null;
		try?{
			uri?=?new?URI(url);//視頻中忘了加url,所以輸出httpPost,會(huì)顯示POST?null?HTTP/1.1
		}?
		catch?(URISyntaxException?e1)?{
			e1.printStackTrace();
		}
		httpPost.setURI(uri);
		System.out.println(httpPost);//POST?null?HTTP/1.1
		try?{
			HttpResponse?reponse?=?httpClient.execute(httpPost);
			System.out.println("d");
			String?result?=?EntityUtils.toString(reponse.getEntity(),"UTF-8");
			System.out.println(result);
			jsonObject=JSONObject.fromObject(result);
			System.out.println(jsonObject);
		}?
		catch?(ClientProtocolException?e)?{
			e.printStackTrace();
		}?
		catch?(IOException?e)?{
			e.printStackTrace();
		}
		
		return?jsonObject;
	}


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為什么doPost會(huì)拋空指針的異常

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