Exchange of information between two Web Applications [closed]

Answer 1

Regardless of the business requirement, what you want to achieve is have 2 web applications communicate together.

In your case the web apps are both Java web apps but they could be different languages (C#, Java...) As Pavel points out what you want to achieve is described in Enterprise Integration Patterns and more specifically in Service-Oriented Architectures (SOA).

Right now, to be efficient, you want to consider exposing one web application as a web service. Java gives you two options:

• JAX-WS SOAP-based web services
• JAX-RS REST-based web services

There are great tutorials on either stack you can have a look at. JAX-WS is already part of the Oracle JDK so it doesn't require any additional libraries. Have a look here.

Answer 2

Typically the first application would send the id to the second one as a query parameter, which would return the data as output. So the second application would act as a simple web query, which the first one would open and read.

Answer 3

You can try with writing on the file from one web app and reading from other. Another approach is to read and write to a shared database or (if both web applications are on the same machine, file system).

Answer 4

you can use a huge amount of solutions

1. web services on both applications, the first one which will receive data for a generating the report(App2) and the second one which will receive the report on app1 side
2. file based solution where the first application will place the data which should be processed by App2, App2 reads this data, and after processing the application 2 will place the result of the report generating to a filesystem
3. etc.

The selection of approach depends on your goals/times/resources/architecture of existing applications and many other conditions which might have influence.

Read about

http://en.wikipedia.org/wiki/Enterprise_application_integration

http://en.wikipedia.org/wiki/Enterprise_Integration_Patterns