Spring 使用 p 命名空間

•為了簡化 XML 檔案的配置，越來越多的 XML 檔案采用屬性而非子元素配置資訊。

•Spring 從 2.5 版本開始引入了一個新的 p 命名空間，可以通過 <bean> 元素屬性的方式配置 Bean 的屬性。

•使用 p 命名空間後，基于 XML 的配置方式将進一步簡化

•使用ref可以連接配接其他bean。

例如：

1、普通方法

application.xml

<bean id="helloWorld24" class="com.hello.HelloWorld2" p:id="10" p:name="20" p:pass="30"/>           

JavaBean.class

package com.hello;

public class HelloWorld2 {

    private int id;
    private String name;
    private String pass;

    public HelloWorld2() {
        super();
    }

    public HelloWorld2(int id, String name, String pass) {
        this.id = id;
        this.name = name;
        this.pass = pass;
    }

    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;
    }

    public String getPass() {
        return pass;
    }

    public void setPass(String pass) {
        this.pass = pass;
    }

    @Override
    public String toString() {
        return "HelloWorld2{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", pass='" + pass + '\'' +
                '}';
    }
}
           

Main.class

package test;

import com.hello.AList;
import com.hello.HelloWorld;
import com.hello.HelloWorld2;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MainTest1 {

    public static void main(String[] args) {

        //建立Spring IOC容器
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring-application.xml");

        HelloWorld2 helloWorld2 = (HelloWorld2) applicationContext.getBean("helloWorld24");
        System.out.println(helloWorld2);
    }
}
           

2、使用ref連接配接其他bean

<bean id="address" class="com.hello.Address" p:city="淄博" p:road="柳泉路"/>
    <bean id="userInfo" class="com.hello.UserInfo" p:id="100" p:name="Hern" p:pass="123456" p:address-ref="address"/>           

package com.hello;

import lombok.Getter;
import lombok.Setter;
import lombok.ToString;

@Getter
@Setter
@ToString
public class Address {
    private String city;
    private String road;

    public Address() {
        super();
    }

    public Address(String city, String road) {
        this.city = city;
        this.road = road;
    }
}
           

package com.hello;

import lombok.Getter;
import lombok.Setter;
import lombok.ToString;

@Setter
@Getter
@ToString
public class UserInfo {

    private int id;
    private String name;
    private String pass;
    private Address address;

    public UserInfo() {
        super();
    }

    public UserInfo(int id, String name, String pass, Address address) {
        this.id = id;
        this.name = name;
        this.pass = pass;
        this.address = address;
    }
}
           

package test;

import com.hello.UserInfo;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MainTest2 {

    public static void main(String[] args) {
        ApplicationContext applicationContext = new ClassPathXmlApplicationContext("spring-application2.xml");
        UserInfo userInfo = (UserInfo) applicationContext.getBean("userInfo");
        System.out.println(userInfo);
    }
}