What is the difference between the SSH framework and the SSM framework?

Both SSH framework and SSM framework are common frameworks for Java Web development, each representing different technological combinations.

The SSH framework refers to the combination of Struts, Spring, and Hibernate. Struts is a web application framework based on the MVC design pattern for handling user requests and responses. Spring is a lightweight IoC (Inversion of Control) and AOP (Aspect Oriented Programming) container for managing the lifecycle of beans and handling transactions between different modules. Hibernate is an excellent object-relational mapping (ORM) framework for mapping Java objects to table structures in a database.

The SSM framework refers to the combination of Spring + SpringMVC + MyBatis. Spring and SpringMVC have similar functions to Spring in the SSH framework, with SpringMVC used to handle user requests and responses. MyBatis is an excellent persistence framework that maps Java objects to SQL statements, providing a convenient way to operate databases.

The main difference between the two lies in the choice of persistence layer. The SSH framework uses Hibernate as the persistence layer framework, while the SSM framework uses MyBatis as the persistence layer framework. Hibernate automatically maps objects to the database, reducing the need for writing SQL statements, but it may not be as flexible for complex SQL queries. On the other hand, MyBatis requires manual SQL statement writing, allowing for more precise control over SQL queries, but requiring more coding work.

In conclusion, the SSH framework and the SSM framework have differences in terms of technology combination and persistence layer selection. The specific choice of which framework to use depends on the project requirements and the technical background of the development team.