JAVA执行shell脚本并实时获取输出

个人博客原文地址:http://www.ltang.me/2016/10/23/java-call-shell/

之前做文档站点的时候有一个需求，做一个在线部署页面，能够通过页面上点点点就自动部署远程服务器上的服务，并且看到部署日志。简单的思路就是，页面通过websocket连接到java后台，java代码调用shell脚本执行发布操作，获取输出，并通过websocket将输出内容返回页面。

Runtime runtime = Runtime.getRuntime();
Process process;
BufferedReader br = null;
BufferedWriter wr = null;
try {
    process = runtime.exec("//要执行的命令");

    br = new BufferedReader(new InputStreamReader(process.getInputStream()));
    wr = new BufferedWriter(new OutputStreamWriter(process.getOutputStream()));
    
    String inline;
    while ((inline = br.readLine()) != null) {
        if (!inline.equals("")) {
            inline = inline.replaceAll("<", "&lt;").replaceAll(">", "&gt;");
            session.getBasicRemote().sendText(inline);  //返回给页面
            if (inline.endsWith("发布到服务器?[Y/N]:")) {
                wr.write("y");                          //自动输入y
                wr.newLine();
                wr.flush();
                session.getBasicRemote().sendText("y");
            }
        } else {
            session.getBasicRemote().sendText("\n");    //换行
        }
    }
    br.close();
    br = new BufferedReader(new InputStreamReader(process.getErrorStream()));    //错误信息
    while ((inline = br.readLine()) != null) {
        if (!inline.equals(""))
            session.getBasicRemote().sendText("<font color='red'>" + inline + "</font>");
        else
            session.getBasicRemote().sendText("\n");
    }
} catch (Exception e) {
    LOGGER.error(e.getMessage(), e);
    session.getBasicRemote().sendText("<font color='red'>" + e.getMessage() + "</font>");
} finally {
    if (br != null)
        br.close();
    if (wr != null)
        wr.close();
    session.getBasicRemote().sendText("End.");
}