string(270) "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%E7%9A%84%E7%9B%AE%E7%9A%84%E5%9C%A8%E4%BA%8E => Failed to connect to 101.91.112.32 port 38221: Connection refused"
java环境变量配置的目的在于
