使用JavaConfig方式-Spring 基础学习

在Spring的使用中，大量采用xml方式配置类之间的关系太过于繁琐(个人这么认为)，而在学习了Spring4后发下使用JavaConfig方式来配置这些关系会更加的简单明了。

测试环境

1. Apache Maven

2. JDK 1.8

3. IDEA 15

先决条件

1. 使用IDEA创建一个Maven项目

2. 在pom.xml 中引用

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-webmvc</artifactId>
    <version>4.1.5.RELEASE</version>
</dependency>

3. 实际代码

很简单的一个Service吧！(这里为了方便省略了interface)

public class FunctionService {

    public String sayHello(String msg) {

        return "Hello " + msg + "!";

    }

}

这里相当于组合上面的类

public class UseFunctionService {

    private FunctionService functionService;

    public void setFunctionService(FunctionService functionService) {

        this.functionService = functionService;

    }

    public String SayHello(String msg) {

        return functionService.sayHello(msg);

    }

}

然后重头戏

1. 用@Configuration 表示这是一个spring java配置类

2. 定义了 ApplicationContext中的一个Bean等同于<bean id="functionService" class="com.malin.FunctionService"/>

3. 同2一样

package com.malin.javaconfig;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

@Configuration　　//1

public class JavaConfig {

    @Bean　　　　　//2

    public FunctionService functionService() {

        return new FunctionService();

    }

    @Bean　　　　　　//3

    public UseFunctionService useFunctionService() {

        UseFunctionService useFunctionService = new UseFunctionService();

        useFunctionService.setFunctionService(functionService());

        return useFunctionService;

    }

}

在编写一个测试类吧

package com.malin.javaconfig;

import org.springframework.context.annotation.AnnotationConfigApplicationContext;

public class Main {

    public static void main(String[] args) {

        AnnotationConfigApplicationContext context = new AnnotationConfigApplicationContext(JavaConfig.class);

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

        System.out.println(service.SayHello("小马"));

        context.close();

    }

}

　　然后输出了结果

D:\software\java\bin\java -Didea.launcher.port=7534 "-Didea.launcher.bin.path=D:\software\IntelliJ IDEA 2016.1.3\bin" -Dfile.encoding=UTF-8 -classpath "D:\software\java\jre\lib\charsets.jar;D:\software\java\jre\lib\deploy.jar;D:\software\java\jre\lib\ext\access-bridge-64.jar;D:\software\java\jre\lib\ext\cldrdata.jar;D:\software\java\jre\lib\ext\dnsns.jar;D:\software\java\jre\lib\ext\jaccess.jar;D:\software\java\jre\lib\ext\jfxrt.jar;D:\software\java\jre\lib\ext\localedata.jar;D:\software\java\jre\lib\ext\nashorn.jar;D:\software\java\jre\lib\ext\sunec.jar;D:\software\java\jre\lib\ext\sunjce_provider.jar;D:\software\java\jre\lib\ext\sunmscapi.jar;D:\software\java\jre\lib\ext\sunpkcs11.jar;D:\software\java\jre\lib\ext\zipfs.jar;D:\software\java\jre\lib\javaws.jar;D:\software\java\jre\lib\jce.jar;D:\software\java\jre\lib\jfr.jar;D:\software\java\jre\lib\jfxswt.jar;D:\software\java\jre\lib\jsse.jar;D:\software\java\jre\lib\management-agent.jar;D:\software\java\jre\lib\plugin.jar;D:\software\java\jre\lib\resources.jar;D:\software\java\jre\lib\rt.jar;D:\workspace\spring-1\target\classes;C:\Users\Administrator\.m2\repository\org\springframework\spring-webmvc\4.1.5.RELEASE\spring-webmvc-4.1.5.RELEASE.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-beans\4.1.5.RELEASE\spring-beans-4.1.5.RELEASE.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-core\4.1.5.RELEASE\spring-core-4.1.5.RELEASE.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-context\4.1.5.RELEASE\spring-context-4.1.5.RELEASE.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-aop\4.1.5.RELEASE\spring-aop-4.1.5.RELEASE.jar;C:\Users\Administrator\.m2\repository\aopalliance\aopalliance\1.0\aopalliance-1.0.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-expression\4.1.5.RELEASE\spring-expression-4.1.5.RELEASE.jar;C:\Users\Administrator\.m2\repository\commons-logging\commons-logging\1.2\commons-logging-1.2.jar;C:\Users\Administrator\.m2\repository\org\springframework\spring-web\4.1.5.RELEASE\spring-web-4.1.5.RELEASE.jar;D:\software\IntelliJ IDEA 2016.1.3\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain com.malin.javaconfig.Main

六月 26, 2016 4:18:45 上午 org.springframework.context.annotation.AnnotationConfigApplicationContext prepareRefresh

信息: Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@1a6c5a9e: startup date [Sun Jun 26 04:18:45 CST 2016]; root of context hierarchy

Hello 小马!

六月 26, 2016 4:18:45 上午 org.springframework.context.annotation.AnnotationConfigApplicationContext doClose

信息: Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@1a6c5a9e: startup date [Sun Jun 26 04:18:45 CST 2016]; root of context hierarchy

Process finished with exit code 0

巴特西

使用JavaConfig方式-Spring 基础学习

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