Spring注入之注解

繁琐的xml配置有时候让人感到烦躁，而Spring支持的注解配置简化了bean的配置。

所以spring可以使用annotation进行主动注入以及自动检测bean。

<!--启用注解 -->

<context:annotation-config></context:annotation-config>

<!-- 自动检测pojo类为spring中的bean+启用注解 ，有了这个就可以不用配置-->

<context:component-scan base-package="com.lubby.test"></context:component-scan>

Course类

package com.lubby.test;

import org.springframework.stereotype.Component;
@Component
public class Course {
	private String courseName = "Enlish";
	private String teacherName;

	public Course() {
		super();
	}
	public Course(String courseName, String teacherName) {
		super();
		this.courseName = courseName;
		this.teacherName = teacherName;
	}
	public String getCourseName() {
		return courseName;
	}
	public void setCourseName(String courseName) {
		this.courseName = courseName;
	}
<span style="white-space:pre">	</span>public String getTeacherName() {
		return teacherName;
	}
	public void setTeacherName(String teacherName) {
		this.teacherName = teacherName;
	}
	@Override
	public String toString() {
		return "Course [courseName=" + courseName + ", teacherName=" + teacherName + "]";
	}
}

Student类

package com.lubby.test;

import java.util.List;
import javax.annotation.Resource;
import org.springframework.stereotype.Component;

@Component
public class Student {
	private String name;
	private String school;
	private int age;
	@Resource(name = "course")
	private Course course;
	private String address;
	private List<String> teacherName;

	public Student() {
		super();
	}
	public Student(String name, String school, int age, Course course, String address, List<String> teacherName) {
		super();
		this.name = name;
		this.school = school;
		this.age = age;
		this.course = course;
		this.address = address;
		this.teacherName = teacherName;
	}
	public void setAddress(String address) {
		this.address = address;
	}
	public String getAddress() {
		return address;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getSchool() {
		return school;
	}
	public void setSchool(String school) {
		this.school = school;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public Course getCourse() {
		return course;
	}
	public void setCourse(Course course) {
		this.course = course;
	}
	public List<String> getTeacherName() {
		return teacherName;
	}
	public void setTeacherName(List<String> teacherName) {
		this.teacherName = teacherName;
	}
	@Override
	public String toString() {
		return "Student [name=" + name + ", school=" + school + ", age=" + age + ", course=" + course + ", address="
				+ address + ", teacherName=" + teacherName + "]";
	}
}

配置文件

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	default-lazy-init="true"
	xsi:schemaLocation="
    http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.0.xsd
    http://www.springframework.org/schema/mvc
    http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
    ">

	<!-- 自动检测并注册为spring中的bean+启用注解 -->
	<context:component-scan base-package="com.lubby.test"></context:component-scan>

	<bean id="single" class="com.lubby.test.Single" factory-method="getInstance"
		init-method="init" destroy-method="destroy">
		<constructor-arg value="0100102"></constructor-arg>
		<constructor-arg value="I want to play games...."></constructor-arg>
	</bean>
</beans>

Test类

public class Test {

	public static void main(String[] args) {
		ApplicationContext ctx = new ClassPathXmlApplicationContext("com/lubby/test/test.xml");
		 Student student = (Student) ctx.getBean("student");
		 System.out.println(student);
	}
}

常用注解

@Component 表示为Spring组件

@Controller  标示为SpringMVC中的controller

@Service 标示为SpringMVC中的服务

一般用@Componen标示任意自定义注解

@Resource(name = "course")用来注入bean对象  默认是根据name去注入，如果没有指定name那么默认name是类第一个字母小写

Spring注入之注解