use java classes in matlab

Asked by Michael on 20 Apr 2011

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It should be pretty straightforward to get java classes working in matlab but I can't seem to do it...

I want to use functions from HttpClient ( http://hc.apache.org/httpcomponents-client-ga/ ) in my matlab program. I have put the 6 .jar files in the static (also tried dynamic) java path and restarted matlab but I can't call the functions.

I don't have experience with programming in java so it could be that I am making a mistake with my syntax.

Could somebody explain what I have to type in matlab exactly to call the functions?

Thank you very much!

1 Comment

Jarrod Rivituso on 20 Apr 2011

Could you share with us the code that you have tried?

2 Answers

Link

Answer by Richard Alcock on 27 Apr 2011

Accepted Answer

Try the following:

 % Generate the list of jar files
 jarDirectory = 'C:\Temp\httpcomponents-client-4.1.1\lib';
 dirResult = dir([jarDirectory, filesep, '*.jar']);
 jars = cellfun( @(name)fullfile(jarDirectory, name), ...  
                 {dirResult.name}, 'UniformOutput', false );
 % Add jars to the dynamic classpath
 javaaddpath( jars );
 % Check classpath
 javaclasspath('-dynamic')
 % Quick test that we can use classes from the library
 httpclient = org.apache.http.impl.client.DefaultHttpClient()

Since the classes are added to the dynamic classpath, it is not persisted between restarts of MATLAB.

1 Comment

Michael on 29 Apr 2011

This really did the trick. Thank you very much!

Link

Answer by Neha on 21 May 2011

Hey Richard,

I have written a Java program which should be invoked Matlab. I followed ur comments at link: http://www.mathworks.com/matlabcentral/answers/6923-calling-a-java-class-from-matlab Yet I'm not very clear about it. I have this simple HelloWorld program of Java:

    class HelloWorld  
{
   public String Hello()
    
    {          
      String helloWorld="Hello World!";
    return helloWorld;
    }
  public static void main(String s[])
  {
    String helloWorld="Hello World!";
      
  }
}
   I wish to invoke use this reutned value of string further in matlab.
  Plz help, how to invoke this.

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