Develop Reference

How to fix Wget from making a corrupted file in java

I'm trying to create an installer for the java program it's supposed to download a zip file from a URL. to do this I'm using the Wget command to download the files in a specific directory. I made it so the code prints out the command it's executing so I can copy and paste it to test. When I test the command it works perfectly, but when I run the code to do it automatically it corrupts the zip file. it won't unzip, and if i transfer the file to my mac it says Unable to expand filename.zip it is an unsupported file I believe this is because the file is corrupted.
This is the command it runs
wget -O /home/pi/1.2.1.zip https://install.swiftpcb.tech/1.2.1.zip
unzip /home/pi/1.2.1.zip -d /home/pi
this is the output of running the unzip one manually
Archive: 1.2.1.zip
End-of-central-directory signature not found. Either this file is not
a zip file, or it constitutes one disk of a multi-part archive. In the
latter case, the central directory and zip file comment will be found on
the last disk(s) of this archive.
unzip: cannot find zipfile directory in one of 1.2.1.zip or
1.2.1.zip.zip, and cannot find 1.2.1.zip.ZIP, period.
this is the class running the command in java (you only need to focus what in the if statement ran == 0
package Installer;
import java.io.IOException;
import java.sql.*;
public class Main {
public void start() throws IOException, InterruptedException {
// SQLite connection string
String url = new Info().getConfigDir();
// SQL statement for creating a new table
String sql = "CREATE TABLE IF NOT EXISTS appInfo (\n"
+ " \"ID\" INTEGER,\n"
+ " \"version\" TEXT,\n"
+ " \"ran\" INTEGER DEFAULT 0,\n"
+ " PRIMARY KEY(\"ID\" AUTOINCREMENT) \n"
+ ");";
try (Connection conn = DriverManager.getConnection(url);
Statement stmt = conn.createStatement()) {
stmt.execute(sql);
} catch (SQLException e) {
System.out.println(e.getMessage());
}
SQLite lite = new SQLite();
lite.createData();
int versionChangeStatus = lite.updateVersionInDB();
if(versionChangeStatus != 0) System.out.println("Something went wrong");
int ran = lite.getRanValue();
if(ran == 0){
String version = new Info().getVersion();
//for deploy
Process p = Runtime.getRuntime().exec("wget -O /home/pi/" + version + ".zip " + "https://install.swiftpcb.tech/" + version + ".zip" + " && unzip /home/pi/" + version + ".zip -d /home/pi");
System.out.println("wget -O /home/pi/" + version + ".zip " + "https://install.swiftpcb.tech/" + version + ".zip" + " | unzip /home/pi/" + version + ".zip -d /home/pi");
Thread.sleep(2 * 1000);
p = Runtime.getRuntime().exec("unzip /home/pi/1.2.1.zip -d /home/pi");
// Process p = Runtime.getRuntime().exec("wget https://install.swiftpcb.tech/" + version + ".zip" + " && unzip" + version + ".zip -d /home/pi ");
int updateStat = lite.updateRanValue("1");
if(updateStat != 0) System.out.println("Something went wrong");
}
}
}

mysqldump creates a blank file using java

Goodmorning everyone.
I have a problem with my java program: i would like to create a directory to store a .sql file, which will be generated through mysqldump.exe. I've been trying to follow guides on Stack Overflow or others, but i still can't resolve my problem: directory and .sql file are generated, but the file is totally blank. The best part is that pasting the same command (ctrl+C, ctrl+V) on the command line, it works well and generates an ordinary .sql file for a dump operation.
Please help me. I'm using NetBeans 8.0.2 as IDE, there's my code (there are some variables, like SelectedTable, that allows me to get the current user, password etc. Don't care about them: those parts works and the command is correctly generated):
private void jMenuExternalBackupActionPerformed(java.awt.event.ActionEvent evt) {
LocalDate today = LocalDate.now();
GregorianCalendar now = new GregorianCalendar();
String BackupFolderName = SelectedTable.getMaster().getName()+" "+SelectedTable.getName()+" "+today.getYear()+"_"+today.getMonth().getValue()+"_"+today.getDayOfMonth()+" "+now.get(now.HOUR_OF_DAY)+"_"+now.get(now.MINUTE)+"_"+now.get(now.SECOND);
new File("/HyperSQL/Backups/").mkdirs();
new File("/HyperSQL/Backups/"+BackupFolderName+"/").mkdirs();
String command;
if (SelectedTable.getMasterApplication().getPassword().isEmpty())
command = "mysqldump -u" + SelectedTable.getMasterApplication().getUserLogged() + " " + SelectedTable.getMaster().getName() + ""
+ " > \"C:\\HyperSQL\\Backups\\"+BackupFolderName+"\\backup.sql\"";
else
command = "mysqldump -u" + SelectedTable.getMasterApplication().getUserLogged() + " -p" + SelectedTable.getMasterApplication().getPassword() + " " + SelectedTable.getMaster().getName() + ""
+ " > \"C:\\HyperSQL\\Backups\\"+BackupFolderName+"\\backup.sql\"";
try
{
Process exec = Runtime.getRuntime().exec(new String[]{"cmd.exe","/c", command});
}
catch (Exception e)
{
e.printStackTrace();
}
}

Java Runtime Class - Unable to cd in cmd Prompt

This program is to create a server certificate from java without opening a command prompt(at least manually) This code executes successfully, but i can't see my file "server.jks" neither in the "cd"ed directory nor in the default directory where cmd loads up(c:\Documents and Settings\administrator). I am more interested in generating in a specified directory. help me alter my code to do that.
public class SslKeytool
{
public void createServerCertificate(String dn, String alias, String validity, String keystoreName, String keypass, String storepass, String drive, String path)
{
try
{
Runtime runtime = Runtime.getRuntime();
String result;
result = "keytool -genkeypair ";
result = result + "-alias " + alias + " ";
result = result + "-keyalg RSA -dname " + dn + " -validity " + validity + " -keypass" + keypass + " -keystorename " + keystoreName
+ " -storepass" + storepass;
runtime.exec("cmd " + drive + ":");
runtime.exec("cmd cd " + path);
runtime.exec("cmd " + result);
}
catch (Exception e)
{
System.out.println("Whoa! Something went wrong! please make sure that you read the API ");
e.printStackTrace();
}
}
public static void main(String[] args)
{
SslKeytool obj = new SslKeytool();
obj.createServerCertificate("CN=LCMS,OU=Software Solutions,O=Live Connections,L=Chennai,S=TamilNadu,C=Ind", "servercert", "365", "abc.jks", "lcmsauth"
, "lcmsauth", "f", "/keytest");
}
}

mysqldump file creates an empty sql file

i apply comment 1 and 2 alternatively.But i didn't get myqldump file using java.mysqldump working in cmd. i think in cmd it ask password after typing mysqldump comment. please help me fast.thanks in advance.
String dumpCommand = "C:\\Program Files\\MySQL\\MySQL Server 5.0\\bin\\mysqldump" + " -u " + user + " -p" + " " + database + " > " + path;
**//command 1**
Runtime rt = Runtime.getRuntime();
File test = new File(path);
PrintStream ps;
try {
// Process child = rt.exec("Cmd /c \"C:/Program Files/MySQL/MySQL Server 5.0/bin/mysqldump\" -u root -p saxco > "+path);//command 2
Process child = rt.exec(dumpCommand);
ps = new PrintStream(test);
InputStream in = child.getInputStream();
int ch;
while ((ch = in.read()) != -1) {
ps.write(ch);
System.out.write(ch);
}

As documented here you can specify the password in the command like this [...] -pPASSWORD [...]. Note that there must not be a space between the -p option flag and the actual password.
Keep in mind that specifying the password this way is a security risk!

If you don't use a password just don't use the -p option too.
String dumpCommand = "C:\Program Files\MySQL\MySQL Server 5.0\bin\mysqldump" + " -u " + user + database + " > " + path;
or this if you have one (without the gaps)
String dumpCommand = "C:\Program Files\MySQL\MySQL Server 5.0\bin\mysqldump" + " -u " + user + " -p" + password + " " + database + " > " + path;

try this-
String cmd="mysqldump -u "+USER+" -p"+PASSWORD+" "+database+" --routines -r"+PATH;
Runtime runtime = Runtime.getRuntime();
Process exec;
exec = runtime.exec(cmd);
int processComplete = exec.waitFor();
if(processComplete == 0){
System.out.println("Backup taken successfully in "+PATH+" on "+new Date());
} else {
System.out.println("Could not take mysql backup :ERROR:");
}

Java Command Prompt Exit

I have a short question concerning the Runtime.getRuntime.exec("") command in java.
I am trying to make a tunnel to a gateway computer via SSH:
String tunnel = "C:\\Program Files\\PuTTY\\putty.exe -ssh -X -P " + localPort + " " + tempUsername + "#" + localIP
+ " -pw " + tempPassword + " -L " + tunnelPort + ":" + gatewayName + ":"+gatewayPort;
Runtime.getRuntime().exec(tunnel);
This bit of code works properly except the annoying fact that a command prompt appears.
Now I tried to exit the prompt after executing the code:
String tunnel = "C:\\Program Files\\PuTTY\\putty.exe -ssh -X -P " + localPort + " " + tempUsername + "#" + localIP
+ " -pw " + tempPassword + " -L " + tunnelPort + ":" + gatewayName + ":"+gatewayPort;
String cmdCommands [] = {tunnel, "exit"};
Runtime.getRuntime().exec(cmdCommands);
Is it possible to close the command prompt in a similar way like I do or are there better ways? (This code doesnt work)

You'll need to either use an actual SSH library directly instead of putty, as in the comments, or capture the IO streams of the exec
Process p = Runtime.getRuntime().exec(cmdCommands);
InputStream is = p.getInputStream();
OutputStream os = p.getOutputStream();
os.write("exit\n");
It's generally a bad idea to hard code \n, for platform reasons, but you get the idea. Also, you will need to pick the right OutputStream. There are several subclasses(buffered etc.) which may be useful.