Spring uses Spel

1.car class

Package Com.hxzy;


public class Car {


Private String brand;
Private String address;
private int speed;
private double perimeter;

public void Setbrand (String brand) {
This.brand = brand;
}

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

public void setspeed (int speed) {
This.speed = speed;
}

public void Setperimeter (double perimeter) {
This.perimeter = perimeter;
}

Public double Getperimeter () {
return perimeter;
}

Public car () {

}

Public car (string brand, string address, int speed) {
Super ();
This.brand = brand;
this.address = address;
This.speed = speed;
}


@Override
Public String toString () {
Return "car [brand=" + Brand +], address= "+ address +", speed= "
+ Speed + ", perimeter=" + perimeter + "]";
}


}

2.person class

Package Com.hxzy;


public class Person {


private String name;
Private car car;

Private String City;
Determine info According to the car's XX
Private String info;

public void SetName (String name) {
THIS.name = name;
}

public void Setcar (car car) {
This.car = car;
}

public void Setcity (String city) {
this.city = City;
}

public void SetInfo (String info) {
This.info = info;
}


Public person (string name, car car, String city, string info) {
Super ();
THIS.name = name;
This.car = car;
this.city = City;
This.info = info;
}


Public person () {
}


@Override
Public String toString () {
Return ' person [name=] + name + ', car= ' + car + ', city= ' + City
+ ", info=" + info + "]";
}


}

3.address class

Package Com.hxzy;


public class Address {


Private String City;
Private String Street;


Public String getcity () {
return to City;
}


public void Setcity (String city) {
this.city = City;
}


Public String Getstreet () {
return to Street;
}


public void Setstreet (String street) {
This.street = Street;
}


@Override
Public String toString () {
Return "Address [city=" + City + ", street=" + Street + "]";
}


Public Address (String city, String street) {
Super ();
this.city = City;
This.street = Street;
}


Public address () {
Super ();
}


}

4.bean Configuration Class

<?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 ">


<bean id= "Car" class= "Com.hxzy.Car" >
<!--use Spel assignment string-->
<property name= "brand" value= "#{' Chevrolet '}" ></property>
<property name= "Address" value= "SAIC" ></property>
<property name= "Speed" value= "#{' 210 '}" ></property>
<!--use Spel to refer to static properties of a class-->
<property name= "perimeter" value= "#{t" (Java.lang.Math). PI * "></property>
</bean>

<bean id= "Address" class= "com.hxzy.Address" >
<property name= "City" value= "#{' Zhengzhou '}" ></property>
<property name= "Street" value= "#{' Nanyang Road '" ></property>
</bean>

<bean id= "Person" class= "Com.hxzy.Person" >
<property name= "name" value= "Happy Man" ></property>
<property name= "Car" value= "#{car}" ></property>
<!--use Spel to refer to the properties of other beans #{car.address} usage errors, I do not know why the error. -->
<!--property Name= "City" value= "#{car.address}" ></property-->
<property name= "City" value= "#{address.city}" ></property>
<!--property Name= "City" value= "Hefei" ></property-->
<!--spel using operator-->

<!--prompts for errors when using the following caused By:org.springframework.expression.spel.SpelEvaluationException:EL1008E: (POS 4): Field or The property ' speed ' cannot is found on object of type ' Com.hxzy.Car ', for some reason. -->
<!--property Name= "Info" value= "#{car.speed > 200?" ' Good car ': ' Ordinary Car '} ' ></property-->

<!--correct--> when using the following methods
<property name= "Info" value= "#{address.street.equals" (' Nanyang Road ')? ' Joint venture ': ' Garbage Truck '} ' ></property>
<!--property Name= "Info" value= "Good Car" ></property-->
</bean>


</beans>

5. Test class

Abstractapplicationcontext CTX = new Classpathxmlapplicationcontext ("Spel.xml");

Car car = [car] ctx.getbean ("Car");
SYSTEM.OUT.PRINTLN (car);

Address: Ctx.getbean ("address");
SYSTEM.OUT.PRINTLN (address);

Person mans = (person) ctx.getbean ("person");
System.out.println (Mans);
Ctx.close ();