spring4入门篇(一)

/**
*@ author StormMaybin
*@ date 2017-01-13
*@ describe practise spring4.x
*/

生命不息，奋斗不止！

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今天刚考完试，先来一篇小文章压压惊！

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使用idea构建maven web 项目

maven 目录结构

pom.xml

Project Object Model，项目对象模型。通过xml格式保存的pom.xml文件。作用类似ant的build.xml文件，功能更强大。该文件用于管理：源代码、配置文件、开发者的信息和角色、问题追踪系统、组织信息、项目授权、项目的url、项目的依赖关系等等。

<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0modelVersion>
    <properties>
        <java.version>1.7java.version>
    properties>
    <groupId>com.stormma.demogroupId>
    <artifactId>spring4artifactId>
    <version>1.0-SNAPSHOTversion>
    <dependencies>
        
        <dependency>
            <groupId>org.springframeworkgroupId>
            <artifactId>spring-contextartifactId>
            <version>4.1.6.RELEASEversion>
        dependency>
    dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.pluginsgroupId>
                <artifactId>maven-compiler-pluginartifactId>
                <version>2.3.2version>
                <configuration>
                    <source>${java.version}source>
                    <target>${java.version}target>
                configuration>
            plugin>
        plugins>
    build>
project>

如果还要添加其他的依赖包，直接在填写依赖包即可。

spring4示例

FunctionService.java

package com.stormma.service;

import org.springframework.stereotype.Service;

/**
 * Created by lenovo on 2017/1/13.
 */
@Service//1
public class FunctionService {
    public String sayHello (String word) {
        return "Hello " + word + " !";
    }
}

//1 Service注解，表明这是一个Service，并且交给Spring IOC容器进行管理

UseFunctionService.java

package com.stormma.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * Created by lenovo on 2017/1/13.
 */
@Service//1
public class UseFunctionService {
    @Autowired//2
    private FunctionService functionService;

    public String sayHello (String word) {
        return functionService.sayHello(word);
    }
}

//1 同上1
//2 自动装配，IOC容器注入实例

Config.java

package com.stormma.config;

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

/**
 * Created by lenovo on 2017/1/13.
 */
@Configuration//1
@ComponentScan ("com.stormma")//2
public class Config {
}

//1 标记这是一个配置文件
//2 扫描com.stormma包下的所有@Service @Component @Repository 和@Controller 并注册成bean.

Main.java

package com.stormma.main;

import com.stormma.config.Config;
import com.stormma.service.UseFunctionService;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;

/**
 * Created by lenovo on 2017/1/13.
 */
public class Main {
    public static void main(String [] args) {
        AnnotationConfigApplicationContext context =
                new AnnotationConfigApplicationContext(Config.class);

        UseFunctionService useFunctionService = context.getBean(UseFunctionService.class);

        System.out.println(useFunctionService.sayHello("Sprig mvc"));

        context.close();
    }
}