使用JSch“exec”通道,我连接到远程服务器并执行命令。我不能做的是执行ArrayList
中存储的命令列表。我使用for循环将每个元素传递给.setCommand(elem);
但是由于某些奇怪的原因,只有最后一个命令被执行。
ArrayList<String> lists = new ArrayList<String>();
lists.add("hostname");
lists.add("df -l");
Channel channel=session.openChannel("exec");
for (String elem : lists){
((ChannelExec)channel).setCommand(elem);
}
完整代码
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");
for (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
}
}
}
}
答案 0 :(得分:3)
您无法多次拨打setCommand
。 “exec”通道只能运行一个“命令”。
但是在大多数系统/ shell上,“命令”实际上可以包含多个命令。
语法取决于您的系统/ shell。分号通常起作用:
((ChannelExec)channel).setCommand("hostname ; df -l");
某些服务器/ shell也允许换行。
((ChannelExec)channel).setCommand("hostname\ndf -l");
在* nix服务器上,您还可以使用&&
使以下命令仅在先前命令成功时执行:
((ChannelExec)channel).setCommand("hostname && df -l");
另一种选择是为每个命令打开一个新通道。请注意,您可以在单个SSH会话中拥有多个通道。您不必为每个频道/命令重新连接。