Execute a list of commands from an ArrayList using JSch exec in Java -
using jsch "exec" channel, connect remote server , execute command. can't execute list of commands stored in arraylist. use loop pass each element .setcommand(elem); odd reason, last command gets executed.
arraylist<string> lists = new arraylist<string>(); lists.add("hostname"); lists.add("df -l"); channel channel=session.openchannel("exec"); (string elem : lists){ ((channelexec)channel).setcommand(elem); } full code
public class exec{ public static void main(string[] arg){ try { jsch jsch=new jsch(); string host=null; if(arg.length>0){ host=arg[0]; } else{ host=joptionpane.showinputdialog("enter username@hostname", system.getproperty("user.name")+ "@localhost"); } string user=host.substring(0, host.indexof('@')); host=host.substring(host.indexof('@')+1); session session=jsch.getsession(user, host, 22); userinfo ui=new myuserinfo(); session.setuserinfo(ui); session.connect(); arraylist<string> lists = new arraylist<string>(); lists.add("hostname"); lists.add("df -l"); channel channel=session.openchannel("exec"); (string elem : lists){ ((channelexec)channel).setcommand(elem); } channel.setinputstream(null); ((channelexec)channel).seterrstream(system.err); inputstream in=channel.getinputstream(); channel.connect(); byte[] tmp=new byte[1024]; while(true){ while(in.available()>0){ int i=in.read(tmp, 0, 1024); if(i<0)break; system.out.print(new string(tmp, 0, i)); } if(channel.isclosed()){ if(in.available()>0) continue; system.out.println("exit-status: "+channel.getexitstatus()); break; } try{thread.sleep(1000);}catch(exception ee){} } channel.disconnect(); session.disconnect(); } catch(exception e){ system.out.println(e); } } public static class myuserinfo implements userinfo, uikeyboardinteractive{ public string getpassword(){ return passwd; } public boolean promptyesno(string str){ object[] options={ "yes", "no" }; int foo=joptionpane.showoptiondialog(null, str, "warning", joptionpane.default_option, joptionpane.warning_message, null, options, options[0]); return foo==0; } string passwd; jtextfield passwordfield=(jtextfield)new jpasswordfield(20); public string getpassphrase(){ return null; } public boolean promptpassphrase(string message){ return true; } public boolean promptpassword(string message){ object[] ob={passwordfield}; int result= joptionpane.showconfirmdialog(null, ob, message, joptionpane.ok_cancel_option); if(result==joptionpane.ok_option){ passwd=passwordfield.gettext(); return true; } else{ return false; } } public void showmessage(string message){ joptionpane.showmessagedialog(null, message); } final gridbagconstraints gbc = new gridbagconstraints(0,0,1,1,1,1, gridbagconstraints.northwest, gridbagconstraints.none, new insets(0,0,0,0),0,0); private container panel; public string[] promptkeyboardinteractive(string destination, string name, string instruction, string[] prompt, boolean[] echo){ panel = new jpanel(); panel.setlayout(new gridbaglayout()); gbc.weightx = 1.0; gbc.gridwidth = gridbagconstraints.remainder; gbc.gridx = 0; panel.add(new jlabel(instruction), gbc); gbc.gridy++; gbc.gridwidth = gridbagconstraints.relative; jtextfield[] texts=new jtextfield[prompt.length]; for(int i=0; i<prompt.length; i++){ gbc.fill = gridbagconstraints.none; gbc.gridx = 0; gbc.weightx = 1; panel.add(new jlabel(prompt[i]),gbc); gbc.gridx = 1; gbc.fill = gridbagconstraints.horizontal; gbc.weighty = 1; if(echo[i]){ texts[i]=new jtextfield(20); } else{ texts[i]=new jpasswordfield(20); } panel.add(texts[i], gbc); gbc.gridy++; } if(joptionpane.showconfirmdialog(null, panel, destination+": "+name, joptionpane.ok_cancel_option, joptionpane.question_message) ==joptionpane.ok_option){ string[] response=new string[prompt.length]; for(int i=0; i<prompt.length; i++){ response[i]=texts[i].gettext(); } return response; } else{ return null; // cancel } } } }
you cannot call setcommand multiple times. "exec" channel can run single "command" only.
but on systems/shells, "command" can include multiple commands.
a syntax depend on system/shell. semicolons work usually:
((channelexec)channel).setcommand("hostname ; df -l"); some servers/shells allow newline.
((channelexec)channel).setcommand("hostname\ndf -l"); on *nix servers, can use && make following commands executed when previous commands succeeded:
((channelexec)channel).setcommand("hostname && df -l"); another option open new channel each command. note can have multiple channels on single ssh session. not have reconnect each channel/command.
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