The best practice sharing of Jakartaee API framework and Java class library development

Title: The Best Practice Sharing of Jakartaee API Framework and Java Library Development Introduction: This article will share the best practice when using the Jakartaee API framework and Java class library.We will introduce some important design principles and suggestions, and provide corresponding Java code examples to help developers make better use of these frameworks and libraries in actual projects. 1. Familiar with the Jakartaee API framework 1. Learn Jakartaee technology stack: Before the project development, developers should have a certain understanding of the Jakartaee technology stack.This includes familiar Jakartaee specifications and APIs, such as JPA, Servlet, EJB, etc. 2. Use the right framework: Select the appropriate Jakartaee framework according to project needs.For example, for web development, you can choose to use JSF, JAX-RS or Servlet framework.The use of frameworks can accelerate the development process and provide consistency and scalability. 3. Follow the design mode: It is very important to follow the design mode when using the Jakartaee API framework.Design mode can help developers solve common design problems and provide reusable code.For example, use DAO mode to encapsulate the code to access the database. 4. Maintain standard consistency: Jakartaee API framework follows certain specifications and agreement.In the development process, these specifications should be followed to ensure the consistency and maintenance of the code.For example, when writing the RESTFUL API, the HTTP method and the URL structure should be used reasonably. 2. Optimize the use of Java libraries 1. Use dependency management tools: using dependency management tools (such as Maven or Gradle) can better manage and introduce third -party Java libraries.They can automatically resolve dependencies and ensure that the library version used is correct and managed. 2. Avoid repeating code: When using the class library, avoid writing duplicate code.This can be achieved by creating a general tool class or inheriting the self -based class.This can improve the reuse of the code and reduce the possibility of errors. 3. Abnormal treatment: Correct treatment of abnormalities is essential for the use of Java class libraries.Dreatment exceptions can ensure the stability of the program and provide better errors.When capturing abnormalities, appropriate error messages should be provided for easy debugging. 4. Logging: In the development of the class library, the correct log record is important.Proper log levels and information can help debug and diagnose potential issues.Use some popular log frameworks, such as log4j or SLF4J, can easily implement the logging function. Example code: 1. Use JPA to access the database: public class PersonDAO { @PersistenceContext private EntityManager em; public void save(Person person) { em.persist(person); } public Person getById(Long id) { return em.find(Person.class, id); } // Other database operation methods ... } 2. Create RESTFul API: @Path("/users") public class UserResource { @GET @Path("/{id}") @Produces(MediaType.APPLICATION_JSON) public Response getUserById(@PathParam("id") Long id) { User user = userService.getUserById(id); if (user != null) { return Response.ok(user).build(); } else { return Response.status(Response.Status.NOT_FOUND).build(); } } // Other API methods ... } in conclusion: This article shared the best practice when using the Jakartaee API framework and the Java class library.By familiar with the Jakartaee technology stack, follow the design mode, maintain standardization and consistency, and optimize the use of the Java library, developers can better use these frameworks and class libraries.At the same time, we provide some Java code examples to help readers better understand and apply these best practices.This will help developers to improve efficiency, reduce error rates in actual projects, and develop more stable and maintainable applications.