FlatFileItemReader and FlatFileItemWriter Using Batch Job

Question

我想从文本文件中读取、解析和写入数据。我实现了这个目标，但我对标识符的声明有疑问。我在下面展示我的班级。

客户数据映射器.java

public class CustomerDataMapper implements FieldSetMapper<Customer> {
     private static Log log = LogFactory.getLog(CustomerDataMapper.class);
     @Override
     public RawData mapFieldSet(FieldSet fieldSet) throws BindException {
          Customer customer = new Customer();
          try {
              customer.setCustNum(fieldSet.readInt("id"));
              customer.setNameSurname(fieldSet.readString("name"));
          }catch (Exception e){
              log.error("Mapping error, " + e);
          }
          return customer;
     }
}

客户.java

@Component
@Scope("prototype")
public class Customer implements Serializable{
    private Integer custNum;
    private String nameSurname;
    public String getCustNum) {
        return custNum;
    }
    public void setCustNum(String custNum) {
        this.custNum = custNum;
    }
    public String getNameSurname() {
        return nameSurname;
    }
    public void setNameSurname(String nameSurname) {
        this.nameSurname = nameSurname;
    }
}

文件管理器.xml

<bean id="customerFileItemReader" class="org.springframework.batch.item.file.FlatFileItemReader" scope="step">
    <property name= "encoding" value ="Cp1254"/>                           
    <property name="resource" value="#{jobParameters['processPath']}"/>
    <property name="lineMapper">
    <bean class="org.springframework.batch.item.file.mapping.DefaultLineMapper">
        <property name="lineTokenizer">
            <bean class="org.springframework.batch.item.file.transform.FixedLengthTokenizer">
                <property name="names" value="id, name"/>
                <property name="columns" ref="1-9, 10-30"/>
            </bean>
        </property>
        <property name="fieldSetMapper">
            <bean class="mapper.CustomerDataMapper ">
                <property name="fileName" value="#{jobParameters['fileNameAndTime']}"/>
            </bean>
        </property>
    </bean>
</property>

<bean id="customerFileItemWriter" class="org.springframework.batch.item.database.JdbcBatchItemWriter">
    <property name="dataSource" ref="dataSource"/>
    <property name="sql">
        <value>
            <![CDATA[
                insert into CUSTOMER(CUST_NUM, NAME_SURNAME)
                values (:custNum, :nameSurname)
            ]]>
        </value>
    </property>
    <property name="itemSqlParameterSourceProvider">
    <bean class="org.springframework.batch.item.database.BeanPropertyItemSqlParameterSourceProvider"/>
</property>

 <bean id = "customerSkipListener" class="listener.CustomerSkipListener"/>
<batch:job id="customerImportJob">
    <batch:step id="smsPasswordDataImportStep">
        <batch:tasklet>
            <batch:chunk reader="customerFileItemReader" writer="customerFileItemWriter" commit-interval="1" skip-limit="1000">
            <batch:skippable-exception-classes>
                <batch:include class="java.lang.Exception"/>
                <batch:exclude class="java.io.FileNotFoundException"/>
            </batch:skippable-exception-classes> <batch:listeners>
            <batch:listener ref="customerSkipListener" />
        </batch:listeners>
        </batch:chunk>
    </batch:tasklet>
</batch:step>

我想问这个问题，我可以将下面的此类用于FieldSetMapper吗？如果我在定义标识符时不使用驼峰表示法，则写入数据库不起作用。对此有什么办法或方法。非常感谢。

客户.java

@Component
@Scope("prototype")
public class Customer implements Serializable{
private Integer Cust_Num;
private String Name_Surname;
public String getCust_Num() {
    return Cust_Num;
}
public void setCust_Num(String Cust_Num) {
    this.Cust_Num = Cust_Num;
}
public String getName_Surname() {
    return Name_Surname;
}
public void setName_Surname(String Name_Surname) {
    this.Name_Surname = Name_Surname;
}
}

Answer 1

我想问这个，可以将这个类用于FieldSetMapper

是的，您可以使用此类。由于您编写了自定义FieldSetMapper，因此您可以控制映射逻辑。您的映射器将如下所示：

public class CustomerDataMapper implements FieldSetMapper<Customer> {
   private static Log log = LogFactory.getLog(CustomerDataMapper.class);
   @Override
   public RawData mapFieldSet(FieldSet fieldSet) throws BindException {
      Customer customer = new Customer();
      try {
          customer.setCust_Num(fieldSet.readInt("id"));
          customer.setName_Surname(fieldSet.readString("name"));
      }catch (Exception e){
          log.error("Mapping error, " + e);
      }
      return customer;
   }
}

但是你的问题不在阅读方面（和FieldSetMapper），而是在作家方面。JdbcBatchItemWriter使用ItemSqlParameterSourceProvider从Customer对象中提取数据，并在 sql 查询上设置这些数据。默认情况下，使用BeanPropertyItemSqlParameterSourceProvider，此实现根据 JavaBeans 命名约定提取数据。但是，您可以提供自定义实现，在您的情况下，该实现如下所示：

class CustomerItemSqlParameterSourceProvider implements ItemSqlParameterSourceProvider<Customer> {
    @Override
    public SqlParameterSource createSqlParameterSource(Customer customer) {
        Map<String, Object> params = new HashMap<>();
        params.put("custNum", customer.getCust_Num());
        params.put("nameSurname", customer.getName_Surname());
        return new MapSqlParameterSource(params);
    }
}

然后，您将此CustomerItemSqlParameterSourceProvider设置在编写器上。

希望这有帮助。