在另一个独立的Spring项目上添加依赖项？

Question

I am creating two different but related applications. The first application is the backend for an iPhone/Android application, while the other one is a virtual store. These two systems are not dependent on each other. So I could deploy only the virtual store or only the backend.

Both of these application should authenticate against the same user database. So I have started on a third application for accessing this database which holds the user objects. The first thing that I thought was that this application could also stand on it own.

The question is how I should use this shared user repository application in the other applications?

• Should I create a dependency on the service-layer artifact and the domain-artifact and import the Spring config file in the other applications that I create?

• Should I create a web service so I can make requests for user data in the other applications?

Or are there other options that are better? Both the backend and virtual store are web service with REST principles applied. In the virtual store for instance I need to have access to user data from the common repository as well as adding store specific details.

Answer 1

In my case I do like this (Project A is used in B.) :-

To use one project into another project I m using httpcomponents-client-4.2.2 library.

Step 1 : Copied jar of A in B.

Step 2 : In Project B :-

HTTPClientHelper httpClientHelper = new HTTPClientHelper();
HttpEntity httpEntity = httpClientHelper.GET(uri + param);
InputStream inputStream = httpEntity.getContent();
//    ... do other stuffs

Step 3 : In HTTPClientHelper class

// Constructor
public HTTPClientHelper() {
    httpclient = new DefaultHttpClient();
    localContext = new BasicHttpContext();
}

// Execute HTTP GET method of given Service URL
public HttpEntity GET(String url) {
    HttpGet get = new HttpGet(url);

    try {
        response = httpclient.execute(get, localContext);
        httpEntity = response.getEntity();
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return httpEntity;
}

// Execute HTTP POST method of given Service URL
public HttpEntity POST(String url, boolean sendData) {

    HttpPost post = new HttpPost(url);
    if (sendData) {
        post.setEntity(getUrlEncodedFormEntity());
    }
    try {
        response = httpclient.execute(post, localContext);
        httpEntity = response.getEntity();
    } catch (ClientProtocolException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }
    return httpEntity;
}

// Create a list of <name, value> for user name & password
public void createHttpEntity(String name, String value) {
    try {
        nameValuePairs.add(new BasicNameValuePair(name, value));
        setUrlEncodedFormEntity(new UrlEncodedFormEntity(nameValuePairs));
    } catch (UnsupportedEncodingException e) {
        e.printStackTrace();
    }
}

public UrlEncodedFormEntity getUrlEncodedFormEntity() {
    return urlEncodedFormEntity;
}

public void setUrlEncodedFormEntity(UrlEncodedFormEntity urlEncodedFormEntity) {
    this.urlEncodedFormEntity = urlEncodedFormEntity;
}