string(227) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%8E%AF%E5%A2%83%E5%8F%98%E9%87%8Fjavac%E4%B8%8D%E8%A1%8C => Failed to connect to 101.89.143.195 port 38205: Connection refused"
环境变量javac不行
