将此字段值直接注入“studentStepOne”，这是唯一使用它的方法

Question

我开发了Spring Boot-Batch代码并sonarlint/Sonar-Qube给出了以下错误。我浏览了链接，但根据此链接无法理解解决方案：https ://rules.sonarsource.com/java/tag/spring/RSPEC-3305 。

将此字段值直接注入“studentStepOne”，这是唯一使用它的方法。

代码：

@Configuration

@PropertySource("classpath:application.properties")

public class StudentJob {

    @Value( "${spring.chunk.size}")

    private String chunkSize;

    @Autowired

    private JobBuilderFactory jobBuilderFactory;

    @Autowired

    private StepBuilderFactory stepBuilderFactory;

    @Autowired

    private JdbcCursorItemReader<Student> StudentReader;

    @Autowired

    private ItemProcessor<Student, Student> StudentProcessor;

    @Autowired

    private StudentWriter StudentWriter;

    @Bean

    public StudentStepExecuListner StudentStepExecuListner() {

        return new StudentStepExecuListner();

    }

    @Bean("readStudentJob")

    @Primary

    public Job readStudentJob() {

        return jobBuilderFactory.get("readStudentJob")

                .incrementer(new RunIdIncrementer())

                .start(StudentStepOne())

                .build();

    }

    @Bean

    public Step StudentStepOne() {

        return stepBuilderFactory.get("StudentStepOne")

                .<Student, Student>chunk(Integer.parseInt(chunkSize))

                .reader(StudentReader)

                .processor(StudentProcessor)

                .writer(StudentWriter)

                .listener(StudentStepExecuListner())

                .build();

    }

}

Answer 1

根据链接，它似乎是不言自明的：这意味着对仅在单个 @Bean 方法中使用的依赖项使用参数注入而不是字段注入。所以对于你的工作，像这样实例化它：&nbsp;&nbsp;@Bean("readStudentJob") &nbsp;&nbsp;@Primary &nbsp;&nbsp;public&nbsp;Job&nbsp;readStudentJob(Step&nbsp;StudentStepOne)&nbsp;{&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;return&nbsp;jobBuilderFactory.get("readStudentJob") &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;.incrementer(new&nbsp;RunIdIncrementer()) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;.start(StudentStepOne) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;.build(); &nbsp;&nbsp;}无关，但你应该遵循 java 约定。方法应该使用驼峰命名法。StudentStepOne()应该studentStepOne()

Answer 2

在@Configuration类中，spring 将读取该类，尝试引用所有存在的 bean。因此，如果您只想在方法中引用一个 bean，而不在方法之间共享，则不需要连接到类属性中。只需在您的方法构造函数中接收。&nbsp; &nbsp; @Beanpublic Step StudentStepOne(StepBuilderFactory stepBuilderFactory) {&nbsp; &nbsp; return stepBuilderFactory.get("StudentStepOne")&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; .<Student, Student>chunk(Integer.parseInt(chunkSize))&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; .reader(StudentReader)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; .processor(StudentProcessor)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; .writer(StudentWriter)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; .listener(StudentStepExecuListner())&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; .build();}spring 会自动设置 bean。

Answer 3

下面的答案将帮助你。private StepBuilderFactory stepBuilderFactory;@Autowiredpublic void setStepBuilderFactory(StepBuilderFactory stepBuilderFactory) {&nbsp; &nbsp; this.stepBuilderFactory= stepBuilderFactory;}您可以使用 setter 注入，而不是实施字段注入。不推荐现场注入。