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>
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