Java 如何在作业中输入参数

我试图通过控制台输入特定的参数来运行作业，如下所示：

@Value("#{jobParameters['inputFileName']}")
public void setFileName(final String name) {
    inputFileName = name;
}

输入参数是定义为“ficherentrada.csv”的inputFileName，如下所示：

但我得到了这个错误：

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'batchConfiguration': Unsatisfied dependency expressed through method 'setFileName' parameter 0; nested exception is org.springframework.beans.factory.BeanExpressionException: Expression parsing failed; nested exception is org.springframework.expression.spel.SpelEvaluationException: EL1008E: Property or field 'jobParameters' cannot be found on object of type 'org.springframework.beans.factory.config.BeanExpressionContext' - maybe not public or not valid?
                at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredMethodElement.inject(AutowiredAnnotationBeanPostProcessor.java:666) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
                at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:90) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
                at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:372) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
                at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1341) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
                at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:572) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
                at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:495) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
                at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
                at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
                at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
                at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
                at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:759) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
                at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:869) ~[spring-context-5.0.9.RELEASE.jar:5.0.9.RELEASE]
                at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.0.9.RELEASE.jar:5.0.9.RELEASE]
                at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:780) [spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]
                at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:412) [spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]
                at org.springframework.boot.SpringApplication.run(SpringApplication.java:333) [spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]
                at org.springframework.boot.SpringApplication.run(SpringApplication.java:1277) [spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]
                at org.springframework.boot.SpringApplication.run(SpringApplication.java:1265) [spring-boot-2.0.5.RELEASE.jar:2.0.5.RELEASE]
                at com.santalucia.batch.md_mig.Application.main(Application.java:25) [classes/:na]
Caused by: org.springframework.beans.factory.BeanExpressionException: Expression parsing failed; nested exception is org.springframework.expression.spel.SpelEvaluationException: EL1008E: Property or field 'jobParameters' cannot be found on object of type 'org.springframework.beans.factory.config.BeanExpressionContext' - maybe not public or not valid?
                at org.springframework.context.expression.StandardBeanExpressionResolver.evaluate(StandardBeanExpressionResolver.java:164) ~[spring-context-5.0.9.RELEASE.jar:5.0.9.RELEASE]
                at org.springframework.beans.factory.support.AbstractBeanFactory.evaluateBeanDefinitionString(AbstractBeanFactory.java:1452) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
                at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1085) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
                at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1062) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
                at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredMethodElement.inject(AutowiredAnnotationBeanPostProcessor.java:658) ~[spring-beans-5.0.9.RELEASE.jar:5.0.9.RELEASE]
                ... 18 common frames omitted
Caused by: org.springframework.expression.spel.SpelEvaluationException: EL1008E: Property or field 'jobParameters' cannot be found on object of type 'org.springframework.beans.factory.config.BeanExpressionContext' - maybe not public or not valid?
                at org.springframework.expression.spel.ast.PropertyOrFieldReference.readProperty(PropertyOrFieldReference.java:217) ~[spring-expression-5.0.9.RELEASE.jar:5.0.9.RELEASE]
                at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:104) ~[spring-expression-5.0.9.RELEASE.jar:5.0.9.RELEASE]
                at org.springframework.expression.spel.ast.PropertyOrFieldReference.getValueInternal(PropertyOrFieldReference.java:91) ~[spring-expression-5.0.9.RELEASE.jar:5.0.9.RELEASE]
                at org.springframework.expression.spel.ast.CompoundExpression.getValueRef(CompoundExpression.java:52) ~[spring-expression-5.0.9.RELEASE.jar:5.0.9.RELEASE]
                at org.springframework.expression.spel.ast.CompoundExpression.getValueInternal(CompoundExpression.java:88) ~[spring-expression-5.0.9.RELEASE.jar:5.0.9.RELEASE]
                at org.springframework.expression.spel.ast.SpelNodeImpl.getValue(SpelNodeImpl.java:111) ~[spring-expression-5.0.9.RELEASE.jar:5.0.9.RELEASE]
                at org.springframework.expression.spel.standard.SpelExpression.getValue(SpelExpression.java:265) ~[spring-expression-5.0.9.RELEASE.jar:5.0.9.RELEASE]
                at org.springframework.context.expression.StandardBeanExpressionResolver.evaluate(StandardBeanExpressionResolver.java:161) ~[spring-context-5.0.9.RELEASE.jar:5.0.9.RELEASE]
                ... 22 common frames omitted

我是新来的春天批世界，我真的不知道我做错了什么

---

提前感谢您的帮助。

使用Spring，您应该能够通过使用

@Value

注释和

${}

语法来保留命令行参数

public void setFileName(@Value("${inputFileName}") final String name) {
    inputFileName = name;
}

---

显然，

@Value

注释适用于由Spring上下文（bean）管理（有时代理）的对象。

要绑定作业参数，您需要将该功能与

您需要做的是将setter定义为步骤范围的bean。在您的案例中，一种典型的方法是将项读取器声明为bean，并按如下方式传递作业参数：

@Bean
@StepScope
public FlatFileItemReader flatFileItemReader(@Value("#{jobParameters['inputFileName']}") String name) {
   return new FlatFileItemReaderBuilder<Foo>()
               .name("flatFileItemReader")
               .resource(new FileSystemResource(name))
               // set other properties on the reader
}

@Bean
@步进镜
公共FlatFileItemReader FlatFileItemReader（@Value（“#{jobParameters['inputFileName']}”）字符串名）{
返回新的FlatFileItemReaderBuilder（）
.name（“flatFileItemReader”）
.resource（新文件系统资源（名称））
//在读卡器上设置其他属性
}

即使我删除了“jobParameters”语法，我也会得到同样的错误…@Albertus\u Farray你不必这么做。它应该已经由Spring管理了。你可以发布类代码吗？是的，我可以发布它，让我再说一次，Spring可以为你做类型转换，你可以在这种情况下插入

资源而不是字符串。