Spring学习总结[1]-入门

快速入门

目录结构

程序流程

User是实体类；将User注入到UserInit中，初始化实体类;将UserInit注入到UserService中，调用UserInit的方法获得初始化后的User。需要注入的属性必须要有getter，setter方法

User实体类

package me.spring.model;

public class User {
    int     id;
    String  name;
    int     age;
    String  sex;

    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getSex() {
        return sex;
    }
    public void setSex(String sex) {
        this.sex = sex;
    }
}

UserInit

package me.spring.init;

import me.spring.model.User;

public class UserInit {
    User user;
    public User initUser(){
        user.setAge(18);
        user.setId(1);
        user.setName("阿德勒");
        user.setSex("男");
        return user;
    }
    public User getUser() {
        return user;
    }
    public void setUser(User user) {
        this.user = user;
    }

}

UserService

package me.spring.service;

import com.alibaba.fastjson.JSON;

import me.spring.init.UserInit;

public class UserService {
    UserInit userInit;
    public void printUser(){
        System.out.println(JSON.toJSONString(userInit.initUser()));
    }
    public UserInit getUserInit() {
        return userInit;
    }
    public void setUserInit(UserInit userInit) {
        this.userInit = userInit;
    }
}

bean.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                        http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="user" class="me.spring.model.User" />

    <bean id="userInit" class="me.spring.init.UserInit" >
        <!-- 注入User -->
        <property name="user" ref="user" />
    </bean>

    <bean id="userService" class="me.spring.service.UserService" >
        <!-- 注入UserInit -->
        <property name="userInit" >
            <ref bean="userInit"/>
        </property>
    </bean>
</beans>

spring.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
                        http://www.springframework.org/schema/beans/spring-beans.xsd">
     <!-- 引入beansx.xml,当有多个xml时这么写比较好 -->
    <import resource="beans.xml"/>
</beans>

UserServiceTest

package me.spring.service;

import static org.junit.Assert.*;

import org.junit.BeforeClass;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.util.ConcurrencyThrottleSupport;

import me.spring.MyConfig;
import me.spring.service.UserService;

public class UserServiceTest {
    static ApplicationContext context=null;
    @BeforeClass
    public static void B(){
        context=new ClassPathXmlApplicationContext("resources/spring.xml");
        //还可以用java类来管理bean之间的关系，MyConfig代码在下面
        //context=new AnnotationConfigApplicationContext(MyConfig.class);
    }

    @Test
    public void test() {
        UserService s=(UserService) context.getBean("userService");
        s.printUser();
    }

}

MyConfig

package me.spring;

import me.spring.init.UserInit;
import me.spring.model.User;
import me.spring.service.UserService;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class MyConfig {

    @Bean(name="user")
    public User user(){
        return new User();
    }

    @Bean(name="userInit")
    public UserInit userInit(){
        UserInit userInit=new UserInit();
        userInit.setUser(user());
        return userInit;
    }

    @Bean(name="userService")
    public UserService userService(){
        UserService userService=new UserService();
        userService.setUserInit(userInit());
        return userService;
    }

}

结果