Java backend development: API distributed object lookup using Java JNDI

Java back-end development is one of the most promising technical directions in today's Internet industry. With the rapid development and popularization of the Internet, more and more applications need to be able to run in a distributed cluster environment to achieve high concurrency, high availability, and efficient data processing and computing. In this case, the search for API distributed objects has become a very critical issue.

To solve this problem, Java provides a technology called JNDI (Java Naming and Directory Interface). JNDI can realize the search and access of distributed objects in a distributed environment. This article will introduce how to use JNDI for API distributed object lookup.

1. What is JNDI?

JNDI is the Java Naming and Directory Service API, which provides a standard way to find, access and manage distributed objects. JNDI can be used to find and access remote objects, configuration information, database connections and other resources. As a part of Java EE, JNDI implements distributed object access through Java RMI and CORBA technology.

2. Advantages of JNDI

Using JNDI to search for API distributed objects has the following advantages:

(1) Simplified code: Use JNDI Objects can be quickly found and accessed in a distributed environment, which reduces code on the protocol layer and thus simplifies application code.

(2) Improve efficiency: JNDI has high efficiency because it can encapsulate the original complex data structure, thereby improving the speed of data search, access and modification.

(3) Improve maintainability: Use JNDI to reference global static constants in the code, thereby enhancing the maintainability of the code. If an application needs to modify the location or naming rules of the directory service, it can do so through configuration files or environment variables.

3. How to use JNDI

Java applications use JNDI to search for API distributed objects. You need to complete the following steps in sequence:

(1) Create An InitialContext object, which is the initial context used in the JNDI API to locate distributed objects, data sources, and other resources.

(2) Call the lookup() method through the InitialContext object to find the target object.

(3) Use the returned object to perform the required operations.

The following is an example of using JNDI to find a remote EJB:

try {
    Properties env = new Properties();
    env.put(Context.INITIAL_CONTEXT_FACTORY,
            "org.apache.openejb.client.RemoteInitialContextFactory");
    env.put(Context.PROVIDER_URL, "http://localhost:8080/tomee/ejb");
    Context context = new InitialContext(env);
    MyRemoteInterface bean = (MyRemoteInterface) context.lookup("java:global/MyService/MyRemoteBean!com.example.MyRemoteInterface");
    bean.sayHello();
} catch (Exception e) {
    e.printStackTrace();
}

In this example, we first create a Properties object env to set the JNDI context, and then pass the InitialContext object Call the lookup() method to find the JNDI name of the target EJB, and finally perform the operation we want to perform through the returned object.

4. Summary

JNDI is a very useful Java technology that can simplify API distributed object lookup in Java back-end development. The advantage of using JNDI is that it can improve code efficiency, simplify code implementation, and enhance code maintainability. The process of using JNDI requires the completion of three steps: creating an InitialContext object, finding the target object, and performing the required operations. For different distributed APIs, JNDI provides some different interfaces and implementations. Therefore, when using JNDI, we should choose the appropriate JNDI implementation and configuration method.

The above is the detailed content of Java backend development: API distributed object lookup using Java JNDI. For more information, please follow other related articles on the PHP Chinese website!