string(233) "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%E4%B8%8D%E7%94%9F%E6%95%88 => Failed to connect to 14.18.117.71 port 38133: Connection refused"
java环境变量不生效
