Reading Local Server .json File With MobileFirst Javascript Adapter

Is there any way that I can read a .json file (located in server) from a javascript http adapter? I tried a lot of methods described in the internet but they don't seem to work bec

Solution 1:

You can read a file with Javascript as shown below.

function readFile(filename) {
    var content = "";

    var fileReader = new java.io.FileReader(filename);

    var bufferedReader = new java.io.BufferedReader(fileReader);

    var line;

    while((line = bufferedReader.readLine()) != null) {
        content += line;
    }   

    bufferedReader.close();

    return content;
}

function test() {
    var file = 'yourfilename.json';
    var fileContents;
    try {
         fileContents = JSON.parse(readFile(file));     
    }  catch(ex) {
        // handle error                
    }

    return  {
        fileContents: fileContents
    };
}

Solution 2:

For those interested in using Java.

One thing you can do is create a Javascript adapter which will use Java code. It is pretty simple to set up.

First create a Javascript adapter.

Then create a Java class under the server/lib folder. I created the class ReadJSON.java under the package com.sample.customcode.

Inside the ReadJSON.java

public class ReadJSON {
    public static String readJSON() throws IOException {
       //Open File
        File file = new File("file.txt");
        BufferedReader reader = null;
        try {
           //Create the file reader
            reader = new BufferedReader(new FileReader(file));
            String text = null;

            //read file
            while ((text = reader.readLine()) != null) {}
        } finally {
             try {
                 //Close the stream
                 reader.close();
             } 
        }
        return "the text from file";
    }
}

Inside your javascript adapter you can use Java methods like below:

function readJOSN() {
    var JSONfromServer = com.sample.customcode.ReadJSON.readJSON();
    return {
        result: JSONfromServer
    };

}

Hope this helps.