我正在尽力少用XML。我已经编写了一个非常简单的程序,但它却无法正常工作。希望有人能帮我解决问题。
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);
}
文件写入器
public class FileWriter implements LogWriter {
public void write(String text) {
System.out.println("FileWriter: " + text);
}
}
控制台编写器
public class ConsoleWriter implements LogWriter{
public void write(String text) {
System.out.println("Console Writer: "+text);
}
}
日志记录器
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,但我正在尝试摆脱使用XML,只使用注释,因此我制作了这个易于理解的程序作为练习。
<?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>
Logger
应该有@Configuration
,否则它将不会被用作配置类。接下来,你应该将你的配置与应用程序代码分开(单一职责)。从堆栈跟踪来看,你的 jar 文件混合了(来自框架不同版本的 jars)。 - M. Deinum