string(271) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=java%E7%8E%AF%E5%A2%83%E5%8F%98%E9%87%8F%E9%85%8D%E7%BD%AE%E6%9C%89%E4%BB%80%E4%B9%88%E7%94%A8%E5%A4%84 => Failed to connect to 101.89.117.144 port 38022: Connection refused"
java环境变量配置有什么用处
