XML注入其他类型属性
字面量
什么是字面量？
基本数据类型，决定值的对象都是字面量
null值
<property name="address">
<null/>
</property>
xml配置
<?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"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 配置对象的创建 -->
<bean id="book" class="com.test.Book">
<!--
使用property完成属性注入
name:类里面属性名称
value：向属性注入的值
-->
<property name="name" value="第一本书"/>
<property name="author" value="第一个作者"/>
<!--
向属性中设置空值
-->
<property name="address">
<null/>
</property>
</bean>
</beans>
book
package com.test;
/**
* 演示使用色图方法进行属性的注入
*/
public class Book {
private String name;
private String author;
private String address;
public void setAuthor(String author) {
this.author = author;
}
public void setName(String name) {
this.name = name;
}
public void setAddress(String address) {
this.address = address;
}
public void testDemo(){
System.out.println(name + "::" + author + "::" + address);
}
}
测试方法
package com.test;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import static org.junit.Assert.*;
public class BookTest {
@Test
public void testBook(){
//1.加载spring配置文件
ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
//2.获取配置创建的对象
Book book = context.getBean("book", Book.class);
System.out.println("book = " + book);
book.testDemo();
}
}
book = com.test.Book@43a0cee9
第一本书::第一个作者::null
属性值包含特殊符号
xml配置
<?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"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 配置对象的创建 -->
<bean id="book" class="com.test.Book">
<!--
使用property完成属性注入
name:类里面属性名称
value：向属性注入的值
-->
<property name="name" value="第一本书"/>
<property name="author" value="第一个作者"/>
<!--
向属性中设置空值
-->
<!--<property name="address">
<null/>
</property>-->
<!-- 属性值包含特殊符号 例如<南京>-->
<!-- 第一种方式 转义 -->
<!--<property name="address" value="<南京>"/>-->
<!-- 第二种方式 把带特殊符号的内容写到CDATA中 -->
<property name="address">
<value>
<![CDATA[<南京>]]>
</value>
</property>
</bean>
</beans>
注入属性-注入外部bean
通过service层调用到层这样的过程就叫注入外部bean
第一步创建两个类service类和dao类
在service调用dao里面的方法
在spring配置文件中进行配置
service
package com.test.service;
import com.test.dao.UserDao;
public class UserService {
/**
* 创建UserDao的对象
* 原始方式
* private UserDao userDao = new UserDaoImpl();
*/
//创建UserDao属性，生成set方法
private UserDao userDao;
public void setUserDao(UserDao userDao) {
this.userDao = userDao;
}
public void add(){
System.out.println("add....");
userDao.update();
}
}
dao
package com.test.dao;
public interface UserDao {
public void update();
}
daoImpl
package com.test.dao.impl;
import com.test.dao.UserDao;
public class UserDaoImpl implements UserDao {
@Override
public void update() {
System.out.println("dao update");
}
}
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:p="http://www.springframework.org/schema/p"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- service和dao对象创建 -->
<bean id="userService" class="com.test.service.UserService">
<!--
注入userDao对象
name：类里面属性名称
value：属性的值
ref: 创建userDao对象bean标签的id值
-->
<property name="userDao" ref="userDao"/>
</bean>
<bean id="userDao" class="com.test.dao.impl.UserDaoImpl"/>
</beans>
测试
package com.test.service;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class UserServiceTest {
@Test
public void add() {
//1、加载spring配置文件
ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
//获取配置创建的对象
UserService userService = context.getBean("userService", UserService.class);
System.out.println("userService = " + userService);
userService.add();
}
}
userService = com.test.service.UserService@150c158
add....
dao update
注入属性-内部bean和级联赋值
一对多关系
部门和员工是典型的一对多关系，一个部门里面有多个员工，一个员工属于某一个部门，部门是一，员工是多
在实体类之间表示一对多关系
package com.test.entity;
//部门类
public class Dept {
private String name;
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "Dept{" +
"name='" + name + '\'' +
'}';
}
}
package com.test.entity;
//员工类
public class Emp {
private String name;
private String gender;
//员工属于某一部门，使用对象形式表示
private Dept dept;
public void setDept(Dept dept) {
this.dept = dept;
}
public void setName(String name) {
this.name = name;
}
public void setGender(String gender) {
this.gender = gender;
}
@Override
public String toString() {
return "Emp{" +
"name='" + name + '\'' +
", gender='" + gender + '\'' +
", dept=" + dept +
'}';
}
public void testEmp(){
this.toString();
}
}
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 内部bean -->
<bean id="emp" class="com.test.entity.Emp">
<!-- 设置两个普通的属性 -->
<property name="name" value="张三"/>
<property name="gender" value="男"/>
<!-- 设置对象类型属性 -->
<!-- 方法一 引入外部bean -->
<!--<property name="dept" ref="dept"/>-->
<!-- 方法二 内部bean -->
<property name="dept">
<bean id="dept" class="com.test.entity.Dept">
<property name="name" value="研发部"/>
</bean>
</property>
</bean>
<!--<bean id="dept" class="com.test.entity.Dept"/>-->
</beans>
package com.test.entity;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import static org.junit.Assert.*;
public class EmpTest {
@Test
public void testEmp() {
//加载spring配置文件
ApplicationContext context = new ClassPathXmlApplicationContext("spring1.xml");
Emp emp = context.getBean("emp", Emp.class);
System.out.println("emp = " + emp);
emp.testEmp();
}
}
级联赋值
第一种写法
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 内部bean -->
<bean id="emp" class="com.test.entity.Emp">
<!-- 设置两个普通的属性 -->
<property name="name" value="张三"/>
<property name="gender" value="男"/>
<!-- 级联赋值 -->
<property name="dept" ref="dept"/>
</bean>
<bean id="dept" class="com.test.entity.Dept">
<property name="name" value="研发部"/>
</bean>
</beans>
@Test
public void testEm1() {
//加载spring配置文件
ApplicationContext context = new ClassPathXmlApplicationContext("spring2.xml");
Emp emp = context.getBean("emp", Emp.class);
System.out.println("emp = " + emp);
emp.testEmp();
}
第二种写法
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 内部bean -->
<bean id="emp" class="com.test.entity.Emp">
<!-- 设置两个普通的属性 -->
<property name="name" value="张三"/>
<property name="gender" value="男"/>
<!-- 级联赋值 要有dept的get方法 -->
<property name="dept.name" value="研发部"/>
</bean>
<bean id="dept" class="com.test.entity.Dept"/>
</beans>
package com.test.entity;
//员工类
public class Emp {
private String name;
private String gender;
//员工属于某一部门，使用对象形式表示
private Dept dept;
public Dept getDept() {
return dept;
}
public void setDept(Dept dept) {
this.dept = dept;
}
public void setName(String name) {
this.name = name;
}
public void setGender(String gender) {
this.gender = gender;
}
@Override
public String toString() {
return "Emp{" +
"name='" + name + '\'' +
", gender='" + gender + '\'' +
", dept=" + dept +
'}';
}
public void testEmp(){
this.toString();
}
}
package com.test.entity;
//部门类
public class Dept {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "Dept{" +
"name='" + name + '\'' +
'}';
}
}
xml注入集合属性
注入数组类型属性
注入List集合属性
注入Map集合类型属性
注入Set集合类型属性
package com.test1;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Set;
public class Stu {
//数组类型属性
private String[] course;
//list集合类型属性
private List<String> list;
//map集合类型属性
private Map<String,String> map;
//set集合类型属性
private Set<String> set;
public void setSet(Set<String> set) {
this.set = set;
}
public void setList(List<String> list) {
this.list = list;
}
public void setMap(Map<String, String> map) {
this.map = map;
}
public void setCourse(String[] course) {
this.course = course;
}
public void test(){
System.out.println(Arrays.toString(course));
System.out.println(list);
System.out.println(map);
System.out.println(set);
}
}
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 集合类型属性注入 -->
<bean id="stu" class="com.test1.Stu">
<!-- 数组类型属性注入 -->
<property name="course">
<!-- 也可以用list -->
<array>
<value>Java</value>
<value>Mysql</value>
</array>
</property>
<!-- list 类型属性注入 -->
<property name="list">
<list>
<value>张三</value>
<value>李四</value>
</list>
</property>
<!-- map 类型属性注入 -->
<property name="map">
<map>
<entry key="第一个" value="第一个值"/>
<entry key="第二个" value="第二个值"/>
</map>
</property>
<!-- set类型属性注入 -->
<property name="set">
<set>
<value>set1</value>
<value>set2</value>
</set>
</property>
</bean>
</beans>
package com.test1;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import static org.junit.Assert.*;
public class StuTest {
@Test
public void test1() {
ApplicationContext context = new ClassPathXmlApplicationContext("spring4.xml");
Stu stu = context.getBean("stu", Stu.class);
System.out.println(stu);
stu.test();
}
}
com.test1.Stu@768b970c
[Java, Mysql]
[张三, 李四]
{第一个=第一个值, 第二个=第二个值}
[set1, set2]
在集合里面设置对象类型值
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
<!-- 集合类型属性注入 -->
<bean id="stu" class="com.test1.Stu">
<!-- 数组类型属性注入 -->
<property name="course">
<!-- 也可以用list -->
<array>
<value>Java</value>
<value>Mysql</value>
</array>
</property>
<!-- list 类型属性注入 -->
<property name="list">
<list>
<value>张三</value>
<value>李四</value>
</list>
</property>
<!-- map 类型属性注入 -->
<property name="map">
<map>
<entry key="第一个" value="第一个值"/>
<entry key="第二个" value="第二个值"/>
</map>
</property>
<!-- set类型属性注入 -->
<property name="set">
<set>
<value>set1</value>
<value>set2</value>
</set>
</property>
<!-- 注入list集合类型对象 值是对象 -->
<property name="courseList">
<list>
<ref bean="course1"/>
<ref bean="course2"/>
<ref bean="course3"/>
</list>
</property>
</bean>
<!-- 创建多个course对象 -->
<bean id="course1" class="com.test1.Course">
<property name="cname" value="第一个"/>
</bean>
<bean id="course2" class="com.test1.Course">
<property name="cname" value="第2个"/>
</bean>
<bean id="course3" class="com.test1.Course">
<property name="cname" value="第3个"/>
</bean>
</beans>
把集合注入部分提取出来
在spring配置文件中引入名称空间util
<?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:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/beans/spring-util.xsd">
</beans>
使用util标签完成list集合注入提取
<?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:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/beans/spring-util.xsd">
<!-- 提取list集合类型属性注入 -->
<util:list id="bookList">
<value>第一本书</value>
<value>第2本书</value>
<value>第3本书</value>
</util:list>
<!-- 提取list集合类型属性注入使用 -->
<bean id="book" class="com.test1.Book">
<property name="list" ref="bookList"/>
</bean>
</beans>
package com.test1;
import java.util.List;
public class Book {
private List<String> list;
public void setList(List<String> list) {
this.list = list;
}
public void test(){
System.out.println("list = " + list);
}
}
