标签:mod driver tor mysq 操作 注入属性 sch exce rop
内部bean
bean里的属性可以赋空值
先初始化三个Car的bean
<!-- 定义若干辆车 --> <bean id="car1" class="com.entity.Car"> <property name="brand" value="宝马"/> <property name="color" value="白色"/> </bean> <bean id="car2" class="com.entity.Car"> <property name="brand" value="奔驰"/> <property name="color" value="黑色"/> </bean> <bean id="car3" class="com.entity.Car"> <property name="brand" value="路虎"/> <property name="color" value="卡其色"/> </bean>
级联属性
集合属性
数组
<array>标签中 不应该是<value>,而是<ref bean="xxx"/>
<property name="cars"> <!-- 注入数组类型的属性 --> <!-- <array> <ref bean="car1"/> <ref bean="car2"/> <ref bean="car3"/> </array> --> </property>
list类型
<property name="cars"> <!-- 注入List集合类型的属性 --> <list> <ref bean="car1"/> <ref bean="car2"/> <ref bean="car3"/> </list> </property>
set集合
也不是value,而是<ref bean="XXX"/>
<property name="cars"> <!-- 注入Set集合类型的属性 --> <set> <ref bean="car1"/> <ref bean="car2"/> <ref bean="car3"/> </set> </property>
Map类型
<property name="cars"> <!-- map --> <map> <entry key="c0001" value-ref="car1"/> <entry key="c0002" value-ref="car2"/> <entry key="c0003" value-ref="car3"/> </map> </property>
pom.xml文件:
<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>4.0.0</modelVersion> <groupId>com.oracle.dwp</groupId> <artifactId>Spring_innerbean</artifactId> <version>1.0.0</version> <dependencies> <!-- aop --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>4.0.0.RELEASE</version> </dependency> <!-- 上下文 --> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>4.0.0.RELEASE</version> </dependency> <!-- junit单元测试 --> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.10</version> <scope>test</scope> </dependency> </dependencies> </project>
Students.java:
package com.entity; import java.io.Serializable; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Arrays; import java.util.Date; import java.util.List; import java.util.Map; import java.util.Set; import javax.annotation.PostConstruct; import javax.annotation.Resource; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Bean; import org.springframework.stereotype.Component; //加注解注入,起一个别名s1 //@Component("haha") public class Students implements Serializable { private String sid;// 学号 private String name;// 姓名 private String gender;// 性别 private Date birthday;// 生日 private String address;// 住址 // private Car[] cars;// 学生拥有很多辆车 // private List<Car> cars;//集合 // private Set<Car> cars;//set集合 private Map<String,Car> cars;//c0001--->BMW c0002--->BENZ public Students(String sid, String name, String gender, Date birthday, String address, Map<String,Car> cars) { super(); this.sid = sid; this.name = name; this.gender = gender; this.birthday = birthday; this.address = address; this.cars = cars; } public Students(String sid, String name, String gender, Date birthday, String address) { super(); this.sid = sid; this.name = name; this.gender = gender; this.birthday = birthday; this.address = address; } public Students(String sid, String name, String gender, String address) { this.sid = sid; this.name = name; this.gender = gender; this.address = address; } /* * //解决方法1: //在构造方法之后执行一些初始化的操作 * * @PostConstruct public void init(){ //在调用完构造函数之后,birthday还为null,然后使用这个直接赋值 * try { this.setBirthday(new * SimpleDateFormat("yyyy-MM-dd").parse("2000-05-17")); } catch * (ParseException e) { // TODO Auto-generated catch block * e.printStackTrace(); } } */ public Students() { } public String getSid() { return sid; } // @Value("s0006") public void setSid(String sid) { this.sid = sid; } public String getName() { return name; } // @Value("IU") public void setName(String name) { this.name = name; } public String getGender() { return gender; } // @Value("女") public void setGender(String gender) { this.gender = gender; } public Date getBirthday() { return birthday; } // @Value("1998-07-15") public void setBirthday(Date birthday) { this.birthday = birthday; } public String getAddress() { return address; } // @Value("韩国首尔") public void setAddress(String address) { this.address = address; } public Map<String,Car> getCars() { return cars; } public void setCars(Map<String,Car> cars) { this.cars = cars; } @Override public String toString() { return "Students [sid=" + sid + ", name=" + name + ", gender=" + gender + ", birthday=" + birthday + ", address=" + address + ", cars=" + cars + "]"; } }
applicationContext.xml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:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:cache="http://www.springframework.org/schema/cache" xmlns:p="http://www.springframework.org/schema/p" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache-4.0.xsd"> <!-- 表示使用注解 --> <!-- <context:annotation-config/> --> <!-- 扫描带注解的包 --> <!-- <context:component-scan base-package="com.entity"/> --> <!-- 实现类型转换的bean --> <!-- id的名字必须是这个 --> <bean id="customEditorConfigurer" class="org.springframework.beans.factory.config.CustomEditorConfigurer"> <property name="propertyEditorRegistrars"> <list> <bean class="com.convert.MyCustomDateEditorRegister"> <property name="format" value="yyyy-MM-dd"></property> </bean> </list> </property> </bean> <bean id="mydevice" class="com.entity.MoveDisk"> </bean> <bean id="dateFormat" class="java.text.SimpleDateFormat"> <constructor-arg value="yyyy-MM-dd"/> </bean> <!-- 定义若干辆车 --> <bean id="car1" class="com.entity.Car"> <property name="brand" value="宝马"/> <property name="color" value="白色"/> </bean> <bean id="car2" class="com.entity.Car"> <property name="brand" value="奔驰"/> <property name="color" value="黑色"/> </bean> <bean id="car3" class="com.entity.Car"> <property name="brand" value="路虎"/> <property name="color" value="卡其色"/> </bean> <!-- 1. 使用property注入属性的值 --> <bean name="stu,s1,s2" class="com.entity.Students"> <property name="sid" value="s001"/> <property name="name" value="茜茜"/> <property name="birthday"> <!-- 工厂bean,,,的parse方法将字符串转换成Date类型 --> <bean factory-bean="dateFormat" factory-method="parse"> <constructor-arg value="1996-06-06"/> </bean> </property> <!-- 人为给属性赋值为null,,标签===如果不写的话,也会默认为null --> <property name="address"> <!-- 向这个属性赋空值 --> <null></null> </property> <!-- 使用内部bean注入属性值 --> <!-- <property name="car"> <bean id="car" class="com.entity.Car"> <property name="brand" value="BENZ"/> <property name="color" value="红色"/> </bean> </property> --> <!-- <property name="car" ref="car"/> --> <!-- 级联属性:要求car必须初始化 --> <!-- <property name="car.brand" value="路虎"/> --> <property name="cars"> <!-- 注入数组类型的属性 --> <!-- <array> <ref bean="car1"/> <ref bean="car2"/> <ref bean="car3"/> </array> --> <!-- 注入List集合类型的属性 --> <!-- <list> <ref bean="car1"/> <ref bean="car2"/> <ref bean="car3"/> </list> --> <!-- 注入Set集合类型的属性 --> <!-- <set> <ref bean="car1"/> <ref bean="car2"/> <ref bean="car3"/> </set> --> <!-- map --> <map> <entry key="c0001" value-ref="car1"/> <entry key="c0002" value-ref="car2"/> <entry key="c0003" value-ref="car3"/> </map> </property> </bean> <!-- 2. 使用构造方法注入:根据类型和名字匹配,根据次序(下标)匹配 --><!-- 会自动调用Students类的带参数的构造方法,完成实例化 --> <!-- <bean name="stu2" class="com.entity.Students"> <constructor-arg name="sid" type="java.lang.String" value="s004"/> <constructor-arg name="name" type="java.lang.String" value="金泰妍"/> <constructor-arg name="gender" type="java.lang.String" value="女"/> <constructor-arg name="birthday" type="java.util.Date"> <bean factory-bean="dateFormat" factory-method="parse"> <constructor-arg value="1989-03-09"/> </bean> </constructor-arg> <constructor-arg name="address" type="java.lang.String" value="韩国首尔"/> </bean> --> <!-- 不用写name,依次按顺序 --> <!-- 或用下标index,从0开始 --> <bean name="stu2" class="com.entity.Students"> <constructor-arg index="0" type="java.lang.String" value="s004"/> <constructor-arg index="1" type="java.lang.String" value="金泰妍"/> <constructor-arg type="java.lang.String" value="女"/> <constructor-arg type="java.util.Date"> <bean factory-bean="dateFormat" factory-method="parse"> <constructor-arg value="1989-03-09"/> </bean> </constructor-arg> <constructor-arg type="java.lang.String" value="韩国釜山"/> </bean> </beans>
测试:
package com.entity; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.AbstractXmlApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import org.springframework.context.support.FileSystemXmlApplicationContext; public class StudentsTest { @Test public void fun1(){ //获得上下文对象----类路径下 //获取磁盘上的文件 //ApplicationContext ctx=new FileSystemXmlApplicationContext("F:\\haha\\test.xml"); ApplicationContext ctx=new ClassPathXmlApplicationContext("applicationContext.xml"); //1.getBean(String id|name);要求id和name都不能重复。 //Students s = (Students) ctx.getBean("stu2"); //2.getBean(Class clazz);通过类型来加载bean,要求类型必须是唯一的*** //Students s=ctx.getBean(Students.class);//注意:这里无需类型转换。 //3.getBean(String id|name,Class clazz); Students s=ctx.getBean("stu", Students.class); //4.getBean(String id|name, Object ...) ==>getBean(String id|name, Object[] ) //调用指定id的指定的构造方法来获得对象。 System.out.println(s); ((AbstractXmlApplicationContext)ctx).close();//类似流,用完关闭。 } }
这里使用了c3p0,所以要在pom.xml文件中加入其依赖。
<!-- c3p0 --> <dependency> <groupId>com.mchange</groupId> <artifactId>c3p0</artifactId> <version>0.9.5.2</version> </dependency>
applicationContext.xml文件中的
<!-- 自己写入的数据,注入到定义的MyDBUtils类中的DataSource对象中 --> <bean id="dbTools1" class="com.db.MyDBUtils"> <property name="properties"> <props> <prop key="username">root</prop> <prop key="password">root</prop> <prop key="driver">com.mysql.jdbc.Driver</prop> <prop key="url">jdbc:mysql:///oa</prop> </props> </property> </bean>
编写一个与之对应的Java类,完成prop标签向datasource对象的赋值,然后得到Connection对象,返回它。
package com.db; import java.beans.PropertyVetoException; import java.sql.Connection; import java.sql.SQLException; import java.util.Properties; import javax.sql.DataSource; import com.mchange.v2.c3p0.ComboPooledDataSource; public class MyDBUtils { private Properties properties; private ComboPooledDataSource ds=new ComboPooledDataSource();//数据源 public ComboPooledDataSource getDs() { return ds; } public void setDs(ComboPooledDataSource ds) { this.ds = ds; } public Properties getProperties() { return properties; } public void setProperties(Properties properties) { this.properties = properties; try { ds.setDriverClass(this.properties.getProperty("driver")); } catch (PropertyVetoException e) { e.printStackTrace(); } ds.setJdbcUrl(this.properties.getProperty("url")); ds.setUser(this.properties.getProperty("username")); ds.setPassword(this.properties.getProperty("password")); } public Connection getConnection() throws SQLException{ return ds.getConnection(); } }
测试:
package com.db; import java.sql.Connection; import java.sql.SQLException; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class DBTest { @Test public void fun1() throws SQLException{ ApplicationContext ctx=new ClassPathXmlApplicationContext("applicationContext.xml"); MyDBUtils dbTools=(MyDBUtils) ctx.getBean("dbTools1");//已经被赋过值 Connection conn=dbTools.getConnection(); System.out.println(conn); } }
dbconfig.properties:
driver=com.mysql.jdbc.Driver url=jdbc:mysql://localhost:3306/oa?rewriteBatchedStatements=true username=root password=root
applicationContext.xml:
直接取配置文件中的值向自定义的MyDBUtils2类中的DataSource对象中的各值赋值
<!-- 数据源配置文件 --> <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="locations"> <list> <value>classpath*:dbconfig.properties</value> </list> </property> </bean> <bean id="dbTools2" class="com.db.MyDBUtils2"> <property name="ds.driverClass" value="${driver}"/> <property name="ds.jdbcUrl" value="${url}"/> <property name="ds.user" value="${username}"/> <property name="ds.password" value="${password}"/> </bean>
MyDBUtils2.java:
package com.db; import java.sql.Connection; import java.sql.SQLException; import com.mchange.v2.c3p0.ComboPooledDataSource; public class MyDBUtils2 { private ComboPooledDataSource ds=new ComboPooledDataSource();//数据源 public ComboPooledDataSource getDs() { return ds; } public void setDs(ComboPooledDataSource ds) { this.ds = ds; } public Connection getConnection() throws SQLException{ return ds.getConnection(); } }
测试:
package com.db; import java.sql.Connection; import java.sql.SQLException; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; public class DBTest { @Test public void fun1() throws SQLException{ ApplicationContext ctx=new ClassPathXmlApplicationContext("applicationContext.xml"); MyDBUtils2 dbTools=(MyDBUtils2) ctx.getBean("dbTools2"); Connection conn=dbTools.getConnection(); System.out.println(conn); } }
Spring----内bean和集合属性注入和properties属性注入
标签:mod driver tor mysq 操作 注入属性 sch exce rop
原文地址:https://www.cnblogs.com/xjs1874704478/p/11181067.html