我对Java和Spring Framework都很陌生。所以这是我构建的第一个Spring App,我遇到了自动装配我的豆子的问题。
我的Application.java:
@SpringBootApplication
public class Application {
public static void main(String[] args) throws Exception {
SpringApplicationBuilder builder = new SpringApplicationBuilder(Application.class);
builder.headless(false);
ConfigurableApplicationContext ctx = builder.run(args);
AppRepository oAppRepo = ctx.getBean(AppRepository.class);
// Check the SystemTray is supported
if (!SystemTray.isSupported()) {
System.out.println("SystemTray is not supported");
return;
}
CustomTray oTray = ctx.getBean(CustomTray.class);
}
}
我在ressource文件夹中的config.xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
">
<context:property-placeholder location="classpath:/application.properties"/>
<context:component-scan base-package="app"/>
<import resource="beans/*.xml" />
</beans>
我的beans / tray.xml:
<?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="customTray" class="app.CustomTray">
<property name="schedulerThread" value="app.SchedulerThread"></property>
<property name="commandControlInterface" value="app.CommandControlInterface"></property>
</bean>
</beans>
我在启动时遇到的错误消息:
Exception in thread "main" org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [app.CustomTray] is defined
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:371)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:331)
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:968)
at app.Application.main(Application.java:46)
所以我不明白为什么没有合格的Bean因为我在tray.xml中注册了bean。 CustomTray类派生自TrayIcon类,并且创建TrayIcon没什么特别的,但是为了完成, 我的CustomTray:
public class CustomTray extends TrayIcon {
private static final String IMAGE_PATH = "/images/icon.png";
private static final String TOOLTIP = "Test";
private PopupMenu popup;
private SystemTray tray;
@Autowired private AppRepository oAppRepo;
public CustomTray() {
super(createImage(IMAGE_PATH, TOOLTIP), TOOLTIP);
popup = new PopupMenu();
tray = SystemTray.getSystemTray();
try {
this.setup();
} catch (AWTException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@PostConstruct
private void setup() throws AWTException {
}
protected static Image createImage(String path, String description) {
URL imageURL = CustomTray.class.getResource(path);
if (imageURL == null) {
System.err.println("Failed Creating Image. Resource not found: " + path);
return null;
} else {
return new ImageIcon(imageURL, description).getImage();
}
}
}
之前我运行了App,没有使用Autowiring和Beans,但现在我想重构并设置一个干净的Spring App,我希望有人知道我做错了什么。
编辑: 好的,如果我使用UUID提到的注释导入xml-Files,我会收到另一条错误消息。 bean customTray有两个属性,SchedulerThread属性也应该是Singleton Bean。它在beans / scheduler.xml中声明,它本身也有一个属于bean的属性。那样:
scheduler.xml
<?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="schedulerThread" class="app.SchedulerThread">
<property name="processManager" value="app.ProcessManager"></property>
</bean>
</beans>
错误:
Caused by: org.springframework.beans.ConversionNotSupportedException: Failed to convert property value of type 'java.lang.String' to required type 'app.ProcessManager' for property 'processManager'; nested exception is java.lang.IllegalStateException: Cannot convert value of type [java.lang.String] to required type [app.ProcessManager] for property 'processManager': no matching editors or conversion strategy found
连接这些类并创建Bean的最佳方法是什么?正如我所说,我是Spring的新手,我认为我并不了解它使用豆子和自动装配的方式。
答案 0 :(得分:1)
在SpringBoot应用程序中,您需要使用ImportResource
注释
@ImportResource(locations = { "classpath:config.xml", "beans/tray.xml" })
Spring Boot documentation - XML configuration
您可以使用
获取bean名称Arrays.stream(ctx.getBeanDefinitionNames()).forEach(System.out::println);
答案 1 :(得分:0)
对我来说,解决方案是删除XML-Config文件并创建一个AppConfig-File,现在我的Application.java看起来像这样:
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplicationBuilder builder = new SpringApplicationBuilder(Application.class);
builder.headless(false);
builder.run(args);
}
}
和AppConfig这样:
@Configuration
public class AppConfig {
@Autowired
GridFsTemplate gridFSTemplate;
@Autowired
AppRepository appRepository;
@Autowired
UserRepository userRepository;
@Bean
ProcessManager processManager() {
return new ProcessManager();
}
@Bean
SchedulerService schedulerService() {
SchedulerService schedulerService = new SchedulerService();
SchedulerService.setProcessManager(processManager());
SchedulerService.start();
return schedulerService;
}
@Bean
CustomTray customTray() {
if (!SystemTray.isSupported()) {
System.out.println("SystemTray is not supported");
return null;
}
CustomTray customTray = new CustomTray();
customTray.setSchedulerService(schedulerService());
customTray.setAppRepository(this.appRepository);
try {
customTray.setup();
} catch (AWTException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return customTray;
}
@Bean
GridFSController gridFSController() {
GridFSController gridFSController = new GridFSController();
return gridFSController;
}
}
现在我可以使用Autowired注释访问所有这些Bean,并且我不需要context.getBean()。它减少了很多代码,我认为它是更清晰的解决方案。