Spring Framework Introduction

What can struts and hibernate do?

Struts

Solution for control layer in MVC

Request data can be automatically encapsulated, type conversion, file upload, validation ...

Hibernate

solutions for durable layers;

Can do,

Save the object to the database,

The object is taken from the database.

Spring Framework

Project development based on the MVC model of struts and hibernate;

Thinking:

1. Object creation can I write to death?

2. Object creation Details

Number of objects

Action multiple "maintain member variables"

Service One "does not need to maintain public variables"

DAO one "does not need to maintain public variables"

Creation time

Action Access time created

Service startup time created

DAO starts when you create

3. Object dependencies

Action Dependent Service

Service Dependent DAO

Summarize:

Spring is the solution to the above problem! In simple terms, it is the process of creating objects and the dependencies of objects!

Components/ Frame Design

Intrusive design

Introduces a framework that affects the structure of existing classes, that is, the need to implement or inherit some particular class.

Example: Struts framework

Non-intrusive design

The framework is introduced and has no effect on the existing class structure.

Example: Hibernate frame/Spring frame

Control inversion:

Inversion on control, reversing IOC

The creation of the object is given to the outer container, which is called inversion of control.

Dependency Injection, Dependency injection

Working with objects ' dependencies

Difference:

Control reversal, solve object creation problem "object creation to others"

Dependency Injection, (expansion)

After the object is created, the processing of the object's relationship is dependent injection "through set method dependency Injection"

Aop

plane-oriented programming. Facets, simply speaking, can be understood as a class, a class that is formed by a lot of repeating code.

Section Examples: Transactions, logs, permissions;

The Spring framework resolves a framework for object creation and dependency relationships between objects.

And can be used with other frameworks; Spring and struts, spring and hibernate

(A framework for the integration (bonding) function)

Spring provides a one-stop solution:

1) core features of Spring Core spring: IOC container, resolving object creation and dependencies

2) Spring Web Spring support for Web modules.

Can be integrated with struts, allowing struts action to be created to spring

Spring MVC pattern

3) Spring DAO Spring support for JDBC Operations "jdbctemplate Template Tool Class"

4) Spring ORM Spring support for ORM:

Can be integrated with Hibernate, "session"

You can also use spring's encapsulation of hibernate operations

5) Spring AOP slicing programming

6) Springee Spring support for other Java EE modules

Spring Framework Introduction