spring 注解 容器的注入注出

前提：已经部署spring(参考上篇：web project 部署 spring bean工厂)

一：新增依赖jar包

　　1：spring-aop-4.1.6.RELEASE.jar　　(修改applicationContext.xml中beans属性时需要)

二：web.xml不变，修改applicationContext.xml

　　1：去掉dtd(<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN 2.0//EN" "http://www.springframework.org/dtd/spring-beans-2.0.dtd">)

　　2：新增beans属性(xmlns,xmlns:xsi,xmlns:context,xsi:schemaLocation)

　　3：去掉<bean/>的容器注入，修改为注解扫描注入

　　4：去掉<bean/>之间的关联注入，修改为注解自动注入

三：spring容器类采用注解注入注出

　　1：注入spring容器(@Component、@Controller、@Service、@Repository)

　　2：spring容器中注出到bean中(@Resource(name="xxx")、@Autowired)

ps:

　　1:applicationContext.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"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans-2.5.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context-2.5.xsd">
    <context:annotation-config />
    <!-- 根据注解扫描类放入容器  -->
    <context:component-scan base-package="dao,service" />
    <!--升级： 注解,自动注入 -->
    <bean class="org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor" />
</beans>

　　2:servlet不变，service(StudentServiceImpl)

package service;

import javax.annotation.Resource;
import org.springframework.stereotype.Service;
import dao.StudentDao;
import entity.Student;

@Service("studentService")
public class StudentServiceImpl implements StudentService {
    @Resource(name="a")
    private StudentDao studentDaot;

    public void insertStudent(Student student){
        studentDaot.insert(student);
    }
}

　　3：dao(StudentDaoImpl)

package dao;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.text.SimpleDateFormat;
import org.springframework.stereotype.Repository;
import entity.Student;

@Repository("a")
public class StudentDaoImpl implements StudentDao {
    public void insert(Student student){

        try{
            Class.forName(driver);
            Connection con = DriverManager.getConnection(url,userName,password);
            Statement sql = con.createStatement();

            SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
            sql.execute("insert student(name,math,create_time) values(‘"+student.getName()+"‘,‘"+student.getMath()+"‘,‘"+sdf.format(student.getCreateTime())+"‘)");

            sql.close();
            con.close();
        }catch(java.lang.ClassNotFoundException e){
            System.err.println("ClassNotFoundException:" + e.getMessage());
        }catch(SQLException ex){
            System.err.println("SQLException:" + ex.getMessage());
        }

    }
}