Converting Files

To convert project data between different formats you read the source data using an appropriate Reader class, then write the data using a Writer class which matches the format you want to convert to.

MPXJ can do a lot of the work for you, as the example below illustrates. The UniversalProjectReader will detect the type of schedule being read and handle it accordingly. The ProjectWriterUtility will use the extension of the output file to determine the type of file written.

The extensions recognised by the ProjectWriterUtility class are:

• MPX
• XML (writes an MSPDI file)
• PMXML
• PLANNER
• JSON
• SDEF
• XER

JavaC#Python

package org.mpxj.howto.convert;

import net.sf.mpxj.ProjectFile;
import net.sf.mpxj.reader.UniversalProjectReader;
import net.sf.mpxj.writer.ProjectWriter;
import net.sf.mpxj.writer.ProjectWriterUtility;

public class ConvertUniversal
{
    public void convert(String inputFile, String outputFile) throws Exception
    {
        UniversalProjectReader reader = new UniversalProjectReader();
        ProjectFile projectFile = reader.read(inputFile);

        ProjectWriter writer = ProjectWriterUtility.getProjectWriter(outputFile);
        writer.write(projectFile, outputFile);
    }
}

using net.sf.mpxj.reader;
using net.sf.mpxj.writer;

namespace MpxjSamples.HowToConvert;

public class ConvertUniversal
{
    public void Convert(string inputFile, string outputFile)
    {
        var reader = new UniversalProjectReader();
        var projectFile = reader.read(inputFile);

        var writer = ProjectWriterUtility.getProjectWriter(outputFile);
        writer.write(projectFile, outputFile);
    }
}

import jpype
import mpxj

jpype.startJVM()

from net.sf.mpxj.reader import UniversalProjectReader
from net.sf.mpxj.writer import ProjectWriterUtility

def convert(input_file, output_file):
    reader = UniversalProjectReader();
    project_file = reader.read(input_file);
    writer = ProjectWriterUtility.getProjectWriter(output_file);
    writer.write(project_file, output_file);

jpype.shutdownJVM()

If you already know the file types you are converting between, you can use the specific Reader and Writer classes, as shown below.

JavaC#Python

package org.mpxj.howto.convert;

import net.sf.mpxj.ProjectFile;
import net.sf.mpxj.mpp.MPPReader;
import net.sf.mpxj.mpx.MPXWriter;
import net.sf.mpxj.reader.ProjectReader;
import net.sf.mpxj.writer.ProjectWriter;

public class ConvertMppToMpx
{
    public void convert(String inputFile, String outputFile) throws Exception
    {
        ProjectReader reader = new MPPReader();
        ProjectFile projectFile = reader.read(inputFile);

        ProjectWriter writer = new MPXWriter();
        writer.write(projectFile, outputFile);
    }
}

using net.sf.mpxj.mpp;
using net.sf.mpxj.mpx;

namespace MpxjSamples.HowToConvert;

public class ConvertMppToMpx
{
    public void Convert(string inputFile, string outputFile)
    {
        var reader = new MPPReader();
        var projectFile = reader.read(inputFile);

        var writer = new MPXWriter();
        writer.write(projectFile, outputFile);
    }
}

import jpype
import mpxj

jpype.startJVM()

from net.sf.mpxj.mpp import MPPReader
from net.sf.mpxj.mpx import MPXWriter

def convert(input_file, output_file):
    reader = MPPReader()
    project_file = reader.read(input_file)
    writer = MPXWriter()
    writer.write(project_file, output_file)

jpype.shutdownJVM()