从JDeveloper中的项目读取json文件-Oracle MAF项目

Question

I am trying to read a json file into an Oracle MAF project written in JDeveloper 12c. In this kind of project, we have two main folders: ApplicationController and ViewController. My java class is in the ApplicationController folder, and my resource is also there, in public_html folder. I tried everything I found online, but nothing seems to work for me...

So the java class is rooted like this: \\myProject\\ApplicationController\\adfmsrc\\application\\MyJavaClass.java

The json file is rooted like this: \\myProject\\ApplicationController\\public_html\\json\\myJsonFile.json

In my java class I added a function like the following, in order to read the file from project:

public static String loadJSONFromProject(String filename) {
    String json = "";
    try {
            InputStream is = Utils.class.getResourceAsStream(filename);
            int size = is.available();
            byte[] buffer = new byte[size];
            is.read(buffer);
            is.close();
            json = new String(buffer, "UTF-8");
    } catch (Exception ex) {
            ex.printStackTrace();
    }
    return json;
}

The way I tried to call the method is like this:

Utils.loadJSONFromProject("/json/myJsonFile.json");

Utils.loadJSONFromProject("json/myJsonFile.json");

Utils.loadJSONFromProject("../json/myJsonFile.json");

When I run the project, I get a

java.lang.NullPointerException error on line : int size = is.available();

That means that the file wasn't found. The Utils class is the java class that contains the method from above.

Please help me with this...

Thanks in advance.

Answer 1

I managed to make it work like this:

In the folder \\myProject\\ApplicationController\\adfmsrc I added a new folder called "json" where I added my file.

I went to project in JDeveloper, right click on it, then selected "Project Properties". Click on "Compiler". On the field that has the label "Copy File Types to Output Directory:" I added the ".json" extension.

After that, I called in the function above, like this: Utils.loadJSONFromProject("../json/myJsonFile.json"); and it worked like a charm.

Thank you and I hope my answer will be helpful for others, too.