• 峰Spring4学习(3)注入参数的几种类型


    People.java  model类:

    package com.cy.entity;
    
    import java.util.ArrayList;
    import java.util.HashMap;
    import java.util.HashSet;
    import java.util.List;
    import java.util.Map;
    import java.util.Properties;
    import java.util.Set;
    
    public class People {
        private int id;
        private String name;
        private int age;
        private Dog dog;
        private List<String> hobbies = new ArrayList<String>();
        private Set<String> loves = new HashSet<String>();
        private Map<String,String> works = new HashMap<String,String>();
        private Properties addresses = new Properties();
        
        public People() {
            super();
            // TODO Auto-generated constructor stub
        }
        public People(int id, String name, int age) {
            super();
            this.id = id;
            this.name = name;
            this.age = age;
        }
        public int getId() {
            return id;
        }
        public void setId(int id) {
            this.id = id;
        }
        public String getName() {
            return name;
        }
        public void setName(String name) {
            this.name = name;
        }
        public int getAge() {
            return age;
        }
        public void setAge(int age) {
            this.age = age;
        }
        
        
        public Dog getDog() {
            return dog;
        }
        public void setDog(Dog dog) {
            this.dog = dog;
        }
        public List<String> getHobbies() {
            return hobbies;
        }
        public void setHobbies(List<String> hobbies) {
            this.hobbies = hobbies;
        }
        public Set<String> getLoves() {
            return loves;
        }
        public void setLoves(Set<String> loves) {
            this.loves = loves;
        }
        public Map<String, String> getWorks() {
            return works;
        }
        public void setWorks(Map<String, String> works) {
            this.works = works;
        }
        public Properties getAddresses() {
            return addresses;
        }
        public void setAddresses(Properties addresses) {
            this.addresses = addresses;
        }
        
        @Override
        public String toString() {
            return "People [id=" + id + ", name=" + name + ", age=" + age
                    + ", dog=" + dog.getName() + ", hobbies=" + hobbies + ", loves=" + loves
                    + ", works=" + works + ", addresses=" + addresses + "]";
        }
        
    }
    View Code

    com.cy.entity.Dog: Model类:

    package com.cy.entity;
    
    public class Dog {
        private String name;
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
        
        
    }
    View Code

    spring管理bean配置文件:

    beans.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"
        xsi:schemaLocation="http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans.xsd">
        
        <!-- 基本类型值 -->
         <bean id="people1" class="com.cy.entity.People">
             <property name="id" value="1"></property>
             <property name="name" value="张三"></property>
             <property name="age" value="11"></property>
         </bean>
         
         <bean id="dog1" class="com.cy.entity.Dog">
             <property name="name" value="Jack"></property>
         </bean>
         
         <!-- 注入bean -->
         <bean id="people2" class="com.cy.entity.People">
             <property name="id" value="2"></property>
             <property name="name" value="李四"></property>
             <property name="age" value="14"></property>
             <property name="dog" ref="dog1"></property>
         </bean>
         
         <!-- 内部bean -->
         <bean id="people3" class="com.cy.entity.People">
             <property name="id" value="3"></property>
             <property name="name" value="王五"></property>
             <property name="age" value="13"></property>
             <property name="dog">
                 <bean class="com.cy.entity.Dog">
                     <property name="name" value="Tom"></property>
                 </bean>
             </property>
         </bean>
         
         <!-- null值 -->
         <bean id="people4" class="com.cy.entity.People">
             <property name="id" value="4"></property>
             <property name="name" value="赵六"></property>
             <property name="age" value="14"></property>
             <property name="dog">
                 <null></null>
             </property>
         </bean>
         
         <!-- 级联属性 直接这么写,但是people中的dog为null值,会报错,在People dog属性初始化时,直接Dog dog = new Dog() -->
         <!-- 
         <bean id="people5" class="com.cy.entity.People">
             <property name="id" value="5"></property>
             <property name="name" value="孙七"></property>
             <property name="age" value="14"></property>
             <property name="dog.name" value="jack2"></property>
         </bean> -->
         
         <!-- 集合属性 -->
         <bean id="people6" class="com.cy.entity.People">
             <property name="id" value="6"></property>
             <property name="name" value="P6"></property>
             <property name="age" value="16"></property>
             <property name="dog" ref="dog1"></property>
             <property name="hobbies">
                 <list>
                     <value>唱歌</value>
                     <value>跳舞</value>
                 </list>
             </property>
             <property name="loves">
                 <set>
                     <value>唱歌2</value>
                     <value>跳舞2</value>
                 </set>
             </property>
             <property name="works">
                 <map>
                     <entry>
                         <key><value>上午</value></key>
                         <value>写代码</value>
                     </entry>
                     <entry>
                         <key><value>下午</value></key>
                         <value>测试代码</value>
                     </entry>
                 </map>
             </property>
             <property name="addresses">
                 <props>
                     <prop key="address1">aaaa</prop>
                     <prop key="address2">bbbb</prop>
                 </props>
             </property>
         </bean>
    </beans>

    测试代码:

    package com.cy.test;
    
    import org.junit.Before;
    import org.junit.Test;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.support.ClassPathXmlApplicationContext;
    
    import com.cy.entity.People;
    
    public class T {
        
        private ApplicationContext ac;
    
        @Before
        public void setUp() throws Exception {
             ac=new ClassPathXmlApplicationContext("beans.xml");
        }
        
        //基本类型值
        @Test
        public void test() {
            People people1 = (People) ac.getBean("people1");
            System.out.println(people1);
        }
        
        //注入bean
        @Test
        public void test2() {
            People people2 = (People) ac.getBean("people2");
            System.out.println(people2);
        }
        
        //内部bean
        @Test
        public void test3() {
            People people3 = (People) ac.getBean("people3");
            System.out.println(people3);
        }
        
        //注入null值
        @Test
        public void test4() {
            People people4 = (People) ac.getBean("people4");
            System.out.println(people4);
        }
        
        //级联属性  测试代码直接在People类下面初始化dog,Dog dog = new Dog()
        @Test
        public void test5() {
            People people5 = (People) ac.getBean("people5");
            System.out.println(people5);
        }
        
        //注入集合属性
        @Test
        public void test6() {
            People people6 = (People) ac.getBean("people6");
            System.out.println(people6);    
            //People [id=6, name=P6, age=16, dog=Jack, hobbies=[唱歌, 跳舞], loves=[唱歌2, 跳舞2], works={上午=写代码, 下午=测试代码}, addresses={address2=bbbb, address1=aaaa}]
    
        }
        
        
    }
    View Code
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  • 原文地址:https://www.cnblogs.com/tenWood/p/6759971.html
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