關於Spring的搭建可參見：淺析Spring框架的搭建. 在測試之前還是應該先將環境配置好，將相關Jar包導進來。 Spring建立的對象，預設都是單例模式，除非透過scope指定。
最基本的物件建立方式，只需要有一個無參構造函數（類別中沒有寫任何的建構函數，預設就是有一個建構函數，如果寫了任何一個建構函數，預設的無參構造函數就不會自動建立哦!!）和欄位的setter方法。
Person類別：
package com.mc.base.learn.spring.bean;public class Person {private String name;private Integer id; public String getName() {return name;
}public void setName(String name) {this.name = name;
}public Integer getId() {return id;
}public void setId(Integer id) {this.id = id;
}
@Overridepublic String toString() {return "Person [name=" + name + ", id=" + id + "]";
}
}
XML配置：
<?xml version="1.0" encoding="UTF-8"?><beans><bean><property></property><property></property></bean> </beans>
Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'person' defined in class path resource [applicationContext.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.mc.base.learn.spring.bean.Person]: No default constructor found; nested exception is java.lang.NoSuchMethodException: com.mc.base.learn.spring.bean.Person.
#package com.mc.base.learn.spring.bean;public class Person {private String name;private Integer id; public Person(String name, Integer id) {super();this.name = name;this.id = id;
}public String getName() {return name;
}public void setName(String name) {this.name = name;
}public Integer getId() {return id;
}public void setId(Integer id) {this.id = id;
}
@Overridepublic String toString() {return "Person [name=" + name + ", id=" + id + "]";
}
}
<?xml version="1.0" encoding="UTF-8"?><beans><bean><constructor-arg></constructor-arg><constructor-arg></constructor-arg></bean> </beans>
package com.mc.base.learn.spring.factory;import com.mc.base.learn.spring.bean.Person;public class PersonStaticFactory { public static Person createPerson(){return new Person();
} /** * 工厂方法带有参数如何处理？
* @Title: createPerson
* @Description: TODO(这里用一句话描述这个方法的作用)
* @param @param id
* @param @param name
* @param @return
* @return Person 返回类型
* @throws */public static Person createPerson(Integer id,String name){return new Person(name,id);
}
}
<span style="color: #008000;"><!--<span style="color: #008000;">静态的工厂方法核心是class+factory-method <span style="color: #008000;">--><span style="color: #0000ff;"><span style="color: #800000;"><span style="color: #ff0000;"><span style="color: #0000ff;"><span style="color: #ff0000;"><span style="color: #0000ff;"><span style="color: #ff0000;"><span style="color: #0000ff;"><span style="color: #0000ff;"><span style="color: #800000;"><span style="color: #0000ff;"><br> <span style="color: #008000;"><span style="color: #008000;"><span style="color: #008000;"> <span style="color: #0000ff;">bean <span style="color: #ff0000;">id<span style="color: #0000ff;">="person"<span style="color: #ff0000;"> class<span style="color: #0000ff;">="com.mc.base.learn.spring.factory.PersonStaticFactory"<span style="color: #ff0000;"> factory-method<span style="color: #0000ff;">="createPerson"<span style="color: #0000ff;">><br><span style="color: #008000;"><!--<span style="color: #008000;">通过property方法向createPerson传递参数 <span style="color: #008000;">--></span></span></span></span></span></span></span></span></span></span></span></span></span></span></span><br> <property name="name" value="LiuChunfu"></property><br> <property name="id" value="125"></property><br> <br></span></span></span></span></span></span></span></span></span>
@Testpublic void testName() throws Exception {
ApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml");
Person person=ac.getBean("person3", Person.class);
System.out.println(person);//Person [name=LiuChunfu, id=125]}
package com.mc.base.learn.spring.factory;import com.mc.base.learn.spring.bean.Person;public class PersonFactory {public Person createInstance() {return new Person();
}
}
<bean></bean><bean><property></property><property></property></bean>
@Testpublic void testName() throws Exception {
ApplicationContext ac=new ClassPathXmlApplicationContext("applicationContext.xml");
Person person=ac.getBean("person4",Person.class);
System.out.println(person);//Person [name=LiuChunfu, id=125]}以上是Spring創建物件的方式詳解的詳細內容。更多資訊請關注PHP中文網其他相關文章！
