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spring依赖注入

1.构造器注入

2.Set方式注入

依赖注入:Set注入

? 依赖: bean对象的创建依赖于容器

? 注入: bean对象中的所有属性,由容器来注入

package com.liqiliang.pojo;

import java.util.*;

public class Student {

    private String name;
    private Address address;
    private String[] books;
    private List hobbys;
    private Map card;
    private Set games;
    private String wife;
    private Properties info;

    @Override
    public String toString() {
        return "Student{" +
                "name=‘" + name + ‘\‘‘ +
                ", address=" + address.toString()  +
                ", books=" + Arrays.toString(books) +
                ", hobbys=" + hobbys +
                ", card=" + card +
                ", games=" + games +
                ", wife=‘" + wife + ‘\‘‘ +
                ", info=" + info +
                ‘}‘;
    }

    public Set getGames() {
        return games;
    }

    public void setGames(Set games) {
        this.games = games;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Address getAddress() {
        return address;
    }

    public void setAddress(Address address) {
        this.address = address;
    }

    public String[] getBooks() {
        return books;
    }

    public void setBooks(String[] books) {
        this.books = books;
    }

    public List getHobbys() {
        return hobbys;
    }

    public void setHobbys(List hobbys) {
        this.hobbys = hobbys;
    }

    public Map getCard() {
        return card;
    }

    public void setCard(Map card) {
        this.card = card;
    }

    public String getWife() {
        return wife;
    }

    public void setWife(String wife) {
        this.wife = wife;
    }

    public Properties getInfo() {
        return info;
    }

    public void setInfo(Properties info) {
        this.info = info;
    }
}

package com.liqiliang.pojo;

public class Address {
    private String address;

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return "Address{" +
                "address=‘" + address + ‘\‘‘ +
                ‘}‘;
    }
}

红楼梦西游记三国演义听课敲代码看电影LOLCFQQcar20200513小李1234

import com.liqiliang.pojo.Student;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MyTest {
    public static void main(String[] args) {
        ApplicationContext applicationContext =
                new ClassPathXmlApplicationContext("bean.xml");
        Student student = (Student) applicationContext.getBean("student");
        System.out.println(student.toString());
        /*
        Student{
         name=‘李启亮‘,
         address=Address{address=‘上海‘},
         books=[红楼梦, 西游记, 三国演义],
         hobbys=[听课, 敲代码, 看电影],
         card={学号=1, 性别=男, 年龄=18},
         games=[LOL, CF, QQcar],
         wife=‘null‘,
         info={学号=20200513, password=4, url=2, driver=1, 姓名=小李, username=3}}
         */
    }
}

3.拓展方式注入(p命名空间和c命名空间)

实体类

package com.liqiliang.pojo;

public class User {
    private int id;
    private String name;

    public User(int id, String name) {
        this.id = id;
        this.name = name;
    }

    public User() {
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name=‘" + name + ‘\‘‘ +
                ‘}‘;
    }

    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;
    }
}

xml文件

测试类

import com.liqiliang.pojo.Student;
import com.liqiliang.pojo.User;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MyTest {
    @Test
    public void test2(){
        ApplicationContext applicationContext =
                new ClassPathXmlApplicationContext("UserBean.xml");
        User user = (User) applicationContext.getBean("user");
        System.out.println(user);
    }

    @Test
    public void test3(){
        ApplicationContext applicationContext =
                new ClassPathXmlApplicationContext("UserBean.xml");
        User user = (User) applicationContext.getBean("user2");
        System.out.println(user);
    }
}

Spring的依赖注入

标签：getname   app   location   res   西游   return   ext   ack   实体   

原文地址：https://www.cnblogs.com/liqiliang1437/p/12881197.html