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本次实验是参考书本HttpURLConnection来访问的网络,并利用org.json包解析json数据。操作结果如下:
提问:老师,不知道为什么,我在用url获取json数据的时候,获取到的字符串格式是null["xxx":"xxx"],就是会有个null前面,可是在原先的json文件内的'['前,我并没有输入任何字符,甚至使用其他网站的公开api获取到的json数据都是这样。我使用的解决方法是将字符串内去掉null,但搞不明白为什么会出现null,而且卡在这里很久了。