Run Graphviz (dot.exe) through Java application

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Run Graphviz (dot.exe) through Java application

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#1 by (1 votes)

2

I am trying to generate a graph from a .dot file using the Graphviz tool. To do this, within a Java application, I am invoking the command prompt by navigating to the Graphviz installation folder and entering the command as follows:

String cd= "cd C:\Program Files (x86)\Graphviz2.36\bin";  
String comando = " dot -Tpng (...)saidaDot.dot -o (..)out.png ";  
Runtime.getRuntime().exec( "cmd.exe /C start cmd.exe /C "+cd+comando);

Where (...) symbolizes the files directory.

The command prompt opens and closes quickly and I was not successful in generating the out.png file.

Does anyone have any idea where my error might be?

java

asked by anonymous 25.06.2014 / 23:37

1 answer

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score 1 · Accepted Answer

Always try to encapsulate everything that links to external programs in separate classes.

Your error is that you can not use the cd command when calling the console in java.

I think you're looking for something like this:

import java.io.*;

public class GraphViz {
    public void call(String arquivoDot, String arquivoPNG) {

        try {
            Runtime rt = Runtime.getRuntime();
            String graphDir = "C:\Program Files (x86)\Graphviz2.36\bin\dot.exe -Tpng ";
            String cmdString = graphDir + arquivoDot + " -o " + arquivoPNG;
            System.out.println(cmdString);
            Process pr = rt.exec(cmdString);
            BufferedReader entrada = new BufferedReader(new InputStreamReader(pr.getInputStream()));
            String linha = null;
            while ((linha = entrada.readLine()) != null) {
                System.out.println(line);
            }
            pr.waitFor();
            if(pr.exitValue()!=0)
                System.out.println("Erro de saida " + pr.exitValue());
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}