关键代码：
<!-- SpEL赋值一个字面值(没多大意义) --> <bean id="user" class="com.shuoeasy.test.User" p:id="1001" p:name="#{'说易事'}"></bean> <!-- SpEL引用类里面的静态属性 --> <bean id="user2" class="com.shuoeasy.test.User" p:id="1001" p:name="#{T(com.shuoeasy.test.User).USER_NAME}"></bean> <!-- SpEL引用其它bean --> <bean id="order" class="com.shuoeasy.test.Order" > <property name="id" value="8888"></property> <!-- 引用bean --> <property name="user" value="#{user2}"></property> <!-- 引用bean的属性 --> <property name="message" value="备注：#{user2.name}"></property> </bean> <!-- SpEL使用运算符 --> <bean id="user3" class="com.shuoeasy.test.User" p:id="1003" p:name="#{user2.id>1000?'新账号':'旧账号'}"></bean>
详细：
User.java:
package com.shuoeasy.test;
public class User {
public static String USER_NAME = "老鹰开灰机";
private int id;
private String 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;
}
@Override
public String toString() {
return "User [id=" + id + ", name=" + name + "]";
}
}Order.java:
package com.shuoeasy.test;
public class Order {
private int id;
private User user;
private String message;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
@Override
public String toString() {
return "Order [id=" + id + ", user=" + user + ", message=" + message + "]";
}
}bean.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"> <!-- SpEL赋值一个字面值(没多大意义) --> <bean id="user" class="com.shuoeasy.test.User" p:id="1001" p:name="#{'说易事'}"></bean> <!-- SpEL引用类里面的静态属性 --> <bean id="user2" class="com.shuoeasy.test.User" p:id="1001" p:name="#{T(com.shuoeasy.test.User).USER_NAME}"></bean> <!-- SpEL引用其它bean --> <bean id="order" class="com.shuoeasy.test.Order" > <property name="id" value="8888"></property> <!-- 引用bean --> <property name="user" value="#{user2}"></property> <!-- 引用bean的属性 --> <property name="message" value="备注：#{user2.name}"></property> </bean> <!-- SpEL使用运算符 --> <bean id="user3" class="com.shuoeasy.test.User" p:id="1003" p:name="#{user2.id>1000?'新账号':'旧账号'}"></bean> </beans>
Main.java:
package com.shuoeasy.test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class Main {
public static void main(String[] args) {
ApplicationContext ctx = new ClassPathXmlApplicationContext("bean.xml");
// SpEL赋值一个字面值
User user = (User) ctx.getBean("user");
System.out.println("user->" + user);
// SpEL引用类里面的静态属性
User user2 = (User) ctx.getBean("user2");
System.out.println("user2->" + user2);
// SpEL引用其它bean的属性
Order order = (Order) ctx.getBean("order");
System.out.println("order->" + order);
// SpEL使用运算符
User user3 = (User) ctx.getBean("user3");
System.out.println("user2->" + user3);
}
}输出：
user->User [id=1001, name=说易事]
user2->User [id=1001, name=老鹰开灰机]
order->Order [id=8888, user=User [id=1001, name=老鹰开灰机], message=备注：老鹰开灰机]
user3->User [id=1003, name=新账号]
