Question

我正在使用他们自己的参数启动我的jar 3程序。第一和第二个程序完成它们的工作，但不是第二个程序。

这里是代码

Runtime rt = Runtime.getRuntime();
String cmdGet= "something";
try    {
            infolog("Executing command: " + cmdGet);
            rt.exec(cmdGet);
        }
        catch(Exception ex){
            infolog("Unable to launch program 2");
            saveLog();
        }

这里是命令

D:\Root\Module\Translators\L2Fo\SE_Draft_Update.exe -se_file="F:\Disp\Stage\DC\Ude34ea24x591ecb1c412x\M8486.dft" -input_file="F:\Disp\Stage\DC\Ude34ea24x591ecb1c412x\result\AttributeFile_M8486.txt" -log_file="F:\Disp\Stage\DC\Ude34ea24x591ecb1c412x\result\SELogg_M8486.txt"

在日志中我发现正确的命令已启动，但我发现它的工作没有完成。因此，通过在cmd提示符中手动复制字符串，它可以正常工作

此后的第三个程序也有效。我不明白为什么。

Answer 1

有时命令需要自己的cmd-shell。然后你必须添加一个“CMD.EXE / C”前缀。这就是原因所在 'something'行在cmd-Window中工作正常。

if (b_shell == true) cmd = "CMD.EXE /C " + cmdstr;
else                 cmd = cmdstr; 
...
rt.exec(cmd);

我将b_shell作为参数传递给包装器方法：

public static void systemCall(String cmdstr,boolean b_shell,Path logfile) throws IOException

Answer 2

对不起那个答案，也许你想试试一个版本能够等待终止命令并将命令的输出作为ArrayList返回。

/**
 * Executes command 'cmdstr'. The output of the command is stored in a ArrayList-String array
 * @param cmdstr The command line to be executed not containing  a redirect to an outputfile ( &gt; x.txt )
 * @param b_wait If true the command waits until it is finished and 'errmsg' contains the exit value
 * @param b_shell If true the command will be started in a shell (uses prefix CMD.EXE /C)
 * @param errmsg OUT: Error message
 * @return ArrayList-String output or null on error, see errmsg
 * @since Last change: 2014.04.30         
 */ 
public static ArrayList<String> systemCallOutputArray(String cmdstr,boolean b_wait,boolean b_shell,/*IO*/StringBuffer errmsg)  
{ 
final String fn="systemCallOutputArray()"; 
    errmsg.setLength(0);
    if (cmdstr == null || cmdstr.isEmpty()) {  errmsg.append(fn + ": Invalid arg. 'cmdstr' (null or empty)");  return null; }

    ArrayList<String> output = new ArrayList<String>();
    String cmd ="";

try
{
     int exit_value = -1;
     Runtime r = Runtime.getRuntime();
     Process p = r.exec(cmd);  

     String line="";
     if (b_wait == true) 
     {       
        p.waitFor(); // waits until prozess is terminated, throws InterruptedException if wait is interrupted      

        exit_value = p.exitValue();

        BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));      
        while ((line = input.readLine()) != null)
        { if (line.isEmpty() == false) output.add(line); 
        }      
        input.close();
        return output;        
     } 
     // the following lines are for b_wait = false

     BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));      
     while ((line = input.readLine()) != null) 
     { if (line.isEmpty() == false) output.add(line); 
     }      
     input.close();      
     return output;               
} 
catch (Exception e) 
{   
    errmsg.append(fn + " failed: " + e.toString() + " cmd: '" + cmd + "'");   
    return null;
}    
} //---------------- end of systemCallOutputArray()

Answer 3

愿你试试这个：

public class testProcess {

static String cmdGet = "D:\\Root\\Module\\Translators\\L2Fo\\SE_Draft_Update.exe -se_file=\"F:\\Disp\\Stage\\DC\\Ude34ea24x591ecb1c412x\\M8486.dft\" "
        + "-input_file=\"F:\\Disp\\Stage\\DC\\Ude34ea24x591ecb1c412x\\result\\AttributeFile_M8486.txt\" "
        + "-log_file=\"F:\\Disp\\Stage\\DC\\Ude34ea24x591ecb1c412x\\result\\SELogg_M8486.txt\"";


public static void main(String[] args) {
    run();

}

public static void run() {
    try {
    Process p = Runtime.getRuntime().exec(cmdGet);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

}

从Java代码运行命令不起作用，但相同的字符串通过cmd.exe手动工作

3 个答案: