java – 使用Play编写一个简单的Spring示例！骨架

首先,我将Spring模块添加到dependencies.yml：

- play -> spring 1.0.1

然后我根据application.conf中的documentation添加了以下内容：

play.spring.component-scan=true

然后我运行以下代码来下载依赖项并更新我的IntelliJ配置：

play deps --sync
play idealize

现在当我回到IntelliJ时,我可以看到spring-1.0.1已被添加到我看起来正确的项目模块列表中.但是,如果我查看我的项目的依赖项,它没有位于spring-1.0.1 / lib目录中的jar.如果我尝试用@Component注释我的一个类,它就找不到它.但是,如果我手动添加spring-1.0.1 / lib作为项目依赖项,它会发现@Component很好.我想运行其他东西让我的IntelliJ项目识别模块中的弹簧库吗？

我的问题的第二部分涉及连接一个简单的例子并为它编写测试.

所以,假设我有一个这样的Job类：

@Component
@Every("10min")
public class MyJob extends Job {
    private @Inject Printer printer;

    @Override
    public void doJob() throws Exception {
        printer.print();
    }
}

Printer类看起来像这样：

@Component
public class Printer {
    public void print() {
        System.out.println("foo");
    }
}

首先,注释看起来是否正确？其次,我将如何编写一个可以调用MyJob.doJob()的测试但注入一个打印“bar”而不是“foo”的不同打印机？

更新：如Aaron所述,我将@Inject更改为@Autowired.在我的测试课中,我有这样的事情：

@Test
public void testSomething() {
    MyJob job = play.modules.spring.Spring.getBeanOfType(MyJob.class);
    job.doJob();
    ...
}

它使用以下内容在getBeanOfType语句上失败：

play.modules.spring.SpringException
at play.modules.spring.Spring.getBean(Spring.java:11)
at com.testing.JobTest.testSomething(MyJob.java:20)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
at play.test.PlayJUnitRunner$StartPlay$1$1$1.execute(PlayJUnitRunner.java:73)
at play.Invoker$Invocation.run(Invoker.java:265)
at play.Invoker.invokeInThread(Invoker.java:67)
at play.test.PlayJUnitRunner$StartPlay$1$1.evaluate(PlayJUnitRunner.java:68)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at play.test.PlayJUnitRunner.run(PlayJUnitRunner.java:48)
at org.junit.runner.JUnitCore.run(JUnitCore.java:157)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:60)

更新2：好的,我现在真的得到了更多.好像即使我正在进行组件扫描,Spring模块仍然需要conf /目录中的application-context.xml(即使它没有定义bean).

现在我只需要弄清楚如何注入不同版本的Printer对象,它会吐出“bar”而不是“foo”.

更新3：我已使用@Autowired替换@Resource(name =“printer”)并使用@Component(“printer”)注释了我的生产打印机并将其重命名为RealPrinter并提供了一个界面：

@Component("printer")
public class RealPrinter implements Printer {
    public void print() {
        System.out.println("foo");
    }
}

如果我只有上述打印机,注射工作正常.现在,如果我创建一个TestPrinter,我需要Play的Spring模块来实现我想在执行测试类时使用TestPrinter而不是RealPrinter.

@Component("printer")
public class TestPrinter implements Printer {
    public void print() {
        System.out.println("bar");
    }
}

但是,因为我有两个名为“printer”的组件,Play的Spring Module会引发以下异常：

play.exceptions.UnexpectedException: Unexpected Error
at play.Play.start(Play.java:491)
at play.test.PlayJUnitRunner.<init>(PlayJUnitRunner.java:31)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.junit.internal.builders.AnnotatedBuilder.buildRunner(AnnotatedBuilder.java:31)
at org.junit.internal.builders.AnnotatedBuilder.runnerForClass(AnnotatedBuilder.java:24)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:57)
at org.junit.internal.builders.AllDefaultPossibilitiesBuilder.runnerForClass(AllDefaultPossibilitiesBuilder.java:29)
at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(RunnerBuilder.java:57)
at org.junit.internal.requests.ClassRequest.getRunner(ClassRequest.java:24)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:66)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:192)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:60)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:115)
Caused by: java.lang.IllegalStateException: Annotation-specified bean name 'printer' for bean class [com.testing.job.RealPrinter] conflicts with existing,non-compatible bean definition of same name and class [com.testing.job.TestPrinter]
at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.checkCandidate(ClassPathBeanDefinitionScanner.java:267)
at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.doScan(ClassPathBeanDefinitionScanner.java:208)
at org.springframework.context.annotation.ClassPathBeanDefinitionScanner.scan(ClassPathBeanDefinitionScanner.java:180)
at play.modules.spring.SpringPlugin.onApplicationStart(SpringPlugin.java:98)
at play.plugins.PluginCollection.onApplicationStart(PluginCollection.java:408)
at play.Play.start(Play.java:463)
... 19 more

如您所见,异常的原因是现在有两个具有相同名称的打印机.