import com.jcraft.jsch.ChannelExec;
import com.jcraft.jsch.JSchException;
public class ImageTypeDeployer extends MainImageDeployer {
public ImageTypeDeployer(String VolID,String oS,String imageName){
String command="some command"
try {
channel=session.openChannel("exec");
channel.setInputStream(null);
((ChannelExec)channel).setCommand(command);
channel.connect();
} catch (JSchException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
NullPointerException当我line channel = session.openChannel("exec")
将代码放入superclass. 这是因为会话和通道变量没有被继承还是其他原因？
这是我正在建立连接的超类代码。
public void makeAConnection(){
inputFile = RESTEngine.getFilePath();
Properties defaultProps = new Properties();
try {
fin = new FileInputStream(inputFile);
defaultProps.load(fin);
fin.close();
}
catch(FileNotFoundException e1){
System.out.println("The properties file supposed to contain PowerVC Authorization parameters was not found.");
e1.printStackTrace();
System.exit(-1);
}
catch(IOException e1){
System.out.println("An exception occured while trying to open the properties file");
e1.printStackTrace();
System.exit(-1);
}
// assign variables from Input file with default value as null
user = defaultProps.getProperty("UserID", null);
host = defaultProps.getProperty("PowerVC_IP_ADDRESS", null);
password = defaultProps.getProperty("UserPass" ,null );
jsch = new JSch();
try {
session = jsch.getSession(user, host, 22);
session.setPassword(password);
java.util.Properties config = new java.util.Properties();
config.put("StrictHostKeyChecking", "no");
session.setConfig(config);
session.connect();
channel=session.openChannel("exec");
channel.setInputStream(null);
try {
in = channel.getInputStream();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("Connection Successful");
} catch (JSchException e) {
// TODO Auto-generated catch block
System.out.println("Unable to connect");
e.printStackTrace();
}
}
这就是我调用 ImageTypeDeployer 的方式
protected Boolean doInBackground() throws Exception {
makeAConnection();
for(String imageName : volIDMap.keySet()){
String volID = volIDMap.get(imageName);
String oS = osMap.get(imageName);
if (oS.equalsIgnoreCase("aix")){
MainImageDeployer imageDeployer = new ImageTypeDeployer(volID, oS, imageName);
}
}
return null;
}