Question

我是春天的新人当我写一个关于原型和单例的案例时会发生问题

这是代码

package com.springinaction.chapter_3.beanScope;

import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Component;

/**
 * Created by sha0w on 17-3-22.
 */
@Component
@Scope(ConfigurableBeanFactory.SCOPE_PROTOTYPE)
public class Notepad {
    private String notepadText;
    public String getNotepadText() {
        return notepadText;
    }
    public String insertNotepadText(String insert) {
        return notepadText += insert;
    }

}

这是组件

package com.springinaction.chapter_3.beanScope;

import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.context.annotation.*;

/**
 * Created by sha0w on 17-3-22.
 */
@ComponentScan(basePackages = "com.springinaction.chapter_3.beanScope")
@Configuration
public class NotepadConfig {
    @Bean(name = "SingleNotepad")
    public Notepad _notepad() {
        return new Notepad();
    }
}

这是JAVAconfig

之后是测试用例

package com.springinaction.chapter_3.beanScope;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

/**
 * Created by sha0w on 17-3-22.
 */
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = NotepadConfig.class)
public class notePadTest {
    @Autowired
    private
    Notepad notepad_1;
    @Autowired
    private
    Notepad notepad_2;
    private AnnotationConfigApplicationContext annotationConfigApplicationContext = new AnnotationConfigApplicationContext(NotepadConfig.class);
    private Notepad notepad_3 = (Notepad) annotationConfigApplicationContext.getBean("SingleNotepad");
    private Notepad notepad_4 = (Notepad) annotationConfigApplicationContext.getBean("SingleNotepad");

    @Test
    public void scopeTest() {
        notepad_1.insertNotepadText("1.cnm");
        notepad_2.insertNotepadText("2.cnm");
        notepad_3.insertNotepadText("3.cnm");
        notepad_4.insertNotepadText("4.cnm");
        System.out.println(notepad_1.getNotepadText());
        System.out.println(notepad_2.getNotepadText());
        System.out.println(notepad_3.getNotepadText());
        System.out.println(notepad_4.getNotepadText());
    }

}

并且问题发生了

引起：org.springframework.beans.factory.NoUniqueBeanDefinitionException：没有'com.springinaction.chapter_3.beanScope.Notepad'类型的限定bean可用：预期的单个匹配bean但找到2：notepad，SingleNotepad

不应该仅Spring组件扫描@Component吗？

为什么我的@Bean像@Component一样@Autowired？

0 个答案: