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Spring系列教程——07Spring表达式讲解

SpEL表达式语法:

对
   
    进行统一编程，所有的内容都使用value
    
     #{
   123}、#{
   'jack'}:数字、字符串#{
   beanId}:另一个bean引用#{
   beanId.propName}:操作数据#{
   beanId.toString()}:执行方法#{
   T(类).字段|方法}:静态方法或字段
    
   

下面我们对上述语法一一演示:

package domain;public class Address {
       public String getAddress() {
           return address;    }    public void setAddress(String address) {
           this.address = address;    }	    @Override    public String toString() {
           return "Address{" +                "address='" + address + '\'' +                '}';    }    private String address;}

创建类Customer

package domain;public class Customer {
       private  String name;    private  Address address;    private double money;    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 double getMoney() {
           return money;    }    public void setMoney(double money) {
           this.money = money;    }    @Override    public String toString() {
           return "Customer{" +                "name='" + name + '\'' +                ", address=" + address +                ", money=" + money +                '}';    }}

1.数字、字符串

测试代码如下:

ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext("beans.xml");Customer customer = (Customer) context.getBean("customer");System.out.println(customer);

静态方法这里不演示了，读者可以自行操作。

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