Spring batch 项目读取器中的Spring批处理作业参数

我的参数（

workingDirectory

）总是

null

，我不明白为什么？
我正在使用作业启动程序启动作业。
我在数据库中看到了job参数，但它没有被注入到我的阅读器中

@Component("customerReader")
@StepScope
public class CustomReader implements ItemReader<Customer> {

  @Value("#{jobParameters['workingDirectory']}")
  protected String workingDirectory;

  private BufferedReader reader;
  protected ObjectMapper objectMapper = new ObjectMapper();
  private int fileIdx = 1;


  @Override
  public Customer read() throws IOException {

    if(reader == null) {
      reader = new BufferedReader(new FileReader(new File(workingDirectory + "output1.json")));
    }
    String line = reader.readLine();
    if (line == null) {
      try {
        fileIdx++;
        reader = new BufferedReader(
            new FileReader(new File(workingDirectory + "output" + fileIdx + ".json")));
      }
      catch (FileNotFoundException ex) {
        return null;
      }
      line = reader.readLine();
    }
    return objectMapper.readValue(line, Customer.class);
  }
}

这是我的读者

@Component("customerReader")
@StepScope
public class CustomReader implements ItemReader<Customer> {

  @Value("#{jobParameters['workingDirectory']}")
  protected String workingDirectory;

  private BufferedReader reader;
  protected ObjectMapper objectMapper = new ObjectMapper();
  private int fileIdx = 1;


  @Override
  public Customer read() throws IOException {

    if(reader == null) {
      reader = new BufferedReader(new FileReader(new File(workingDirectory + "output1.json")));
    }
    String line = reader.readLine();
    if (line == null) {
      try {
        fileIdx++;
        reader = new BufferedReader(
            new FileReader(new File(workingDirectory + "output" + fileIdx + ".json")));
      }
      catch (FileNotFoundException ex) {
        return null;
      }
      line = reader.readLine();
    }
    return objectMapper.readValue(line, Customer.class);
  }
}

---

我认为这不是spring批处理的问题，而是spring配置的问题。我看到

值（“#{jobParameters['workingDirectory']}”）

为空，因此spring可能无法将此属性注入bean。请检查spring上下文的初始化，并阅读关于

@Value

javadoc的内容