详解Spring基于xml的两种依赖注入方式

详解Spring基于xml的两种依赖注入方式

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

xmlns:xsi="http://w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://springframework.org/schema/beans

http://springframework.org/schema/beans/spring-beans.xsdhttp://">

xmlns:xsi="http://w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://springframework.org/schema/beans

http://springframework.org/schema/beans/spring-beans.xsdhttp://">

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 + '\'' + ", userMessocphJaqxhhage=" + 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

xmlns:xsi="http://w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://springframework.org/schema/beans

http://springframework.org/schema/beans/spring-beans.xsd">

xmlns:xsi="http://w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://springframework.org/schema/beans

http://springframework.org/schema/beans/spring-beans.xsd">

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'}}

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