没有XML的Spring Bean Annotation [英] Spring Bean Annotation with no XML
本文介绍了没有XML的Spring Bean Annotation的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在尽力在这里使用很少甚至没有XML。我做了一个非常简单的程序,但它不起作用。希望有人可以帮助我。
I am doing my best to use little to no XML here. I have made a very simple program but it is not working. Hoping someone could help me out.
public class App {
public static void main(String[] args) {
AnnotationConfigApplicationContext ctx = new
AnnotationConfigApplicationContext(Logger.class);
Logger logger = ctx.getBean(Logger.class);
logger.writeConsole("Hello there");
logger.writeFile("Hi again");
ctx.close();
}
}
接口
public interface LogWriter {
public void write(String text);
}
FileWriter
FileWriter
public class FileWriter implements LogWriter {
public void write(String text) {
System.out.println("FileWriter: " + text);
}
}
ConsoleWriter
ConsoleWriter
public class ConsoleWriter implements LogWriter{
public void write(String text) {
System.out.println("Console Writer: "+text);
}
}
Logger
public class Logger {
@Autowired
private ConsoleWriter consoleWriter;
@Autowired
private FileWriter fileWriter;
public void setConsoleWriter(ConsoleWriter consoleWriter) {
this.consoleWriter = consoleWriter;
}
public void setFileWriter(FileWriter fileWriter) {
this.fileWriter = fileWriter;
}
public void writeFile(String text) {
fileWriter.write(text);
}
public void writeConsole(String text) {
consoleWriter.write(text);
}
@Bean
public Logger getLogger(){
return new Logger();
}
}
错误
Jul 02, 2015 2:52:49 PM org.springframework.context.annotation.AnnotationConfigApplicationContext prepareRefresh
INFO: Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@246b179d: startup date [Thu Jul 02 14:52:49 CEST 2015]; root of context hierarchy
Exception in thread "main" java.lang.NoSuchMethodError: org.springframework.core.GenericTypeResolver.resolveReturnTypeForGenericMethod(Ljava/lang/reflect/Method;[Ljava/lang/Object;)Ljava/lang/Class;
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getTypeForFactoryMethod(AbstractAutowireCapableBeanFactory.java:650)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:575)
at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1344)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doGetBeanNamesForType(DefaultListableBeanFactory.java:356)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:327)
at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:644)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:461)
at org.springframework.context.annotation.AnnotationConfigApplicationContext.<init>(AnnotationConfigApplicationContext.java:73)
at com.main.application.App.main(App.java:10)
这是我的XML文件,但我试图摆脱使用XML和注释,所以我把这个简单的理解程序当作练习。
This is my XML file but I am trying to get away from using XML and just annotations so I made this simple to understand program as practice.
<?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"
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-3.2.xsd">
<context:annotation-config></context:annotation-config>
</beans>
推荐答案
这样做没有任何xml配置
public class App {
public static void main(String[] args) {
ApplicationContext ctx = new AnnotationConfigApplicationContext(Config.class);
Logger logger = ctx.getBean(Logger.class);
logger.writeConsole("Hello there");
logger.writeFile("Hi again");
}
}
配置类
@Configuration
@ComponentScan
public class Config {
}
控制台编写者
@Component
public class ConsoleWriter implements LogWriter{
public void write(String text) {
System.out.println("Console Writer: "+text);
}
}
FileWriter
@Component
public class FileWriter implements LogWriter {
public void write(String text) {
System.out.println("FileWriter: " + text);
}
}
Looger
@Component
public class Logger {
@Autowired
private ConsoleWriter consoleWriter;
@Autowired
private FileWriter fileWriter;
public void setConsoleWriter(ConsoleWriter consoleWriter) {
this.consoleWriter = consoleWriter;
}
public void setFileWriter(FileWriter fileWriter) {
this.fileWriter = fileWriter;
}
public void writeFile(String text) {
fileWriter.write(text);
}
public void writeConsole(String text) {
consoleWriter.write(text);
}
}
接口LogWriter
public interface LogWriter {
public void write(String text);
}
这篇关于没有XML的Spring Bean Annotation的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
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