Question

我是新手使用Spring批处理，我正试图掌握它 SystemCommandTasklet函数。我在Windows 8上使用STS。我要做的是使用SystemCommandTasklet启动一个简单的Java程序“HelloWorld”，并将输出String重定向到txt文件中。

我的HelloWorld程序位于C：\ Users \ nicholas.pizzini \，当我启动时

java -cp C:\Users\nicholas.pizzini\ HelloWorld

我没有遇到任何问题。

但是当我尝试使用SystemCommandTasklet启动它时，它没有产生结果，虽然它告诉我作业已经完成。

这是我的申请背景。

<bean id="jobRepository"
    class="org.springframework.batch.core.repository.support.MapJobRepositoryFactoryBean">
    <property name="transactionManager" ref="transactionManager" />
</bean>

<bean id="transactionManager"
    class="org.springframework.batch.support.transaction.ResourcelessTransactionManager" />

<bean id="jobLauncher"
    class="org.springframework.batch.core.launch.support.SimpleJobLauncher">
    <property name="jobRepository" ref="jobRepository" />
</bean>


<!-- JOB AND STEPS BEAN -->
<batch:job id="helloWorldJob">
    <batch:step id="executeSystemCommandStep" >
        <batch:tasklet ref="executeSystemCommand" />
    </batch:step>
</batch:job>


<bean id="executeSystemCommand"
    class="org.springframework.batch.core.step.tasklet.SystemCommandTasklet">
    <property name="command" value="java -cp C:\Users\nicholas.pizzini HelloWorld > C:\hello\e.txt" />
    <!-- 3 second timeout for the command to complete -->
    <property name="timeout" value="100000" />
    <property name="environmentParams" 
        value="JAVA_HOME=C:\Program Files\Java\jdk1.8.0_45,PATH=C:\Users\nicholas.pizzini\AppData\Roaming\npm;C:\Program Files\Java\jdk1.8.0_45\bin\"/>
</bean>

并且控制台上的输出是：

 nov 04, 2015 4:33:09 PM org.springframework.context.support.AbstractApplicationContext prepareRefresh
INFORMAZIONI: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@439f5b3d: startup date [Wed Nov 04 16:33:09 CET 2015]; root of context hierarchy
nov 04, 2015 4:33:10 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
INFORMAZIONI: Loading XML bean definitions from class path resource [spring/batch/jobs/job-read-files.xml]
nov 04, 2015 4:33:10 PM org.springframework.beans.factory.support.DefaultListableBeanFactory registerBeanDefinition
INFORMAZIONI: Overriding bean definition for bean 'helloWorldJob': replacing [Generic bean: class [org.springframework.batch.core.configuration.xml.SimpleFlowFactoryBean]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null] with [Generic bean: class [org.springframework.batch.core.configuration.xml.JobParserJobFactoryBean]; scope=; abstract=false; lazyInit=false; autowireMode=0; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=null; factoryMethodName=null; initMethodName=null; destroyMethodName=null]
nov 04, 2015 4:33:10 PM org.springframework.beans.factory.support.DefaultListableBeanFactory preInstantiateSingletons
INFORMAZIONI: Pre-instantiating singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@1753acfe: defining beans [jobRepository,transactionManager,jobLauncher,org.springframework.batch.core.scope.internalStepScope,org.springframework.beans.factory.config.CustomEditorConfigurer,org.springframework.batch.core.configuration.xml.CoreNamespacePostProcessor,executeSystemCommandStep,helloWorldJob,executeSystemCommand]; root of factory hierarchy
nov 04, 2015 4:33:10 PM org.springframework.batch.core.launch.support.SimpleJobLauncher afterPropertiesSet
INFORMAZIONI: No TaskExecutor has been set, defaulting to synchronous executor.
nov 04, 2015 4:33:10 PM org.springframework.batch.core.launch.support.SimpleJobLauncher$1 run
INFORMAZIONI: Job: [FlowJob: [name=helloWorldJob]] launched with the following parameters: [{}]
nov 04, 2015 4:33:10 PM org.springframework.batch.core.job.SimpleStepHandler handleStep
INFORMAZIONI: Executing step: [executeSystemCommandStep]
nov 04, 2015 4:33:11 PM org.springframework.batch.core.launch.support.SimpleJobLauncher$1 run
INFORMAZIONI: Job: [FlowJob: [name=helloWorldJob]] completed with the following parameters: [{}] and the following status: [COMPLETED]
Exit Status : COMPLETED
Exit Status : []
Done

Answer 1

SystemCommeandTasklet不会将生成的进程的输出传递给您的日志，因此您不会在那里看到它。如果要创建一个简单的测试脚本来验证它是否正常工作，请创建一个在某处写入文件的脚本。

Answer 2

您可以编写自己的SystemCommandTasklet。以现有代码为基础，然后简单地重新路由outputStream和Process的errorStream。

对于诸如＆＃34;如何重定向输出流＆＃34;等问题有几个答案，例如

检查使用SystemCommandTasklet

2 个答案: