1）使用构造器注入bean

实体类：用户类

public class User { private String name; private UserMessage userMessage; public User() { } public User(String name, UserMessage userMessage) { this.name = name; this.userMessage = userMessage; } public String getName() { return name; } public void setName(String name) { this.name = name; } public UserMessage getUserMessage() { return userMessage; } public void setUserMessage(UserMessage userMessage) { this.userMessage = userMessage; } @Override public String toString() { return "User{" + "name='" + name + '\'' + ", userMessage=" + userMessage + '}'; }}

实体类：用户信息类

public class UserMessage { private String username; private String password; public UserMessage() { } public UserMessage(String username, String password) { this.username = username; this.password = password; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } @Override public String toString() { return "UserMessage{" + "username='" + username + '\'' + ", password='" + password + '\'' + '}'; }}

配置文件

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <!-- 注册UserMessage类 --> <bean id="userMessage" class="entity.UserMessage"> <constructor-arg name="username" value="scott"></constructor-arg> <constructor-arg name="password" value="tiger"></constructor-arg> </bean> <!-- 注册User类 --> <bean id="user" class="entity.User"> <constructor-arg name="name" value="tom"></constructor-arg> <constructor-arg name="userMessage" ref="userMessage"></constructor-arg> </bean></beans>

测试类

public class TestDI { @Test public void test() { ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml"); User user = ac.getBean("user", User.class); System.out.println(user); }}

测试结果

User{name='tom', userMessage=UserMessage{username='scott', password='tiger'}}

2）使用setter方法注入bean

实体类：用户类

public class User { private String name; private UserMessage userMessage; public User() { } public User(String name, UserMessage userMessage) { this.name = name; this.userMessage = userMessage; } public String getName() { return name; } public void setName(String name) { this.name = name; } public UserMessage getUserMessage() { return userMessage; } public void setUserMessage(UserMessage userMessage) { this.userMessage = userMessage; } @Override public String toString() { return "User{" + "name='" + name + '\'' + ", userMessage=" + userMessage + '}'; }}

实体类：用户信息类

public class UserMessage { private String username; private String password; public UserMessage() { } public UserMessage(String username, String password) { this.username = username; this.password = password; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } @Override public String toString() { return "UserMessage{" + "username='" + username + '\'' + ", password='" + password + '\'' + '}'; }}

配置文件

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> <!-- 注册UserMessage类 --> <bean id="userMessage" class="entity.UserMessage"> <property name="username" value="scott"></property> <property name="password" value="tiger"></property> </bean> <!-- 注册User类 --> <bean id="user" class="entity.User"> <property name="name" value="tom"></property> <property name="userMessage" ref="userMessage"></property> </bean></beans>

测试类

public class TestDI { @Test public void test() { ApplicationContext ac = new ClassPathXmlApplicationContext("applicationContext.xml"); User user = ac.getBean("user", User.class); System.out.println(user); }}

测试结果

User{name='tom', userMessage=UserMessage{username='scott', password='tiger'}}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。