基于spring batch实现如下逻辑代码：有一个实体类person，有age和sex，通过itemreadr从db2中读取数据，并通过itemprossor进行判断，只有age大与18岁的数据才通过itemwriter进行db2写入

可以按照以下步骤基于Spring Batch实现该逻辑代码：

1. 创建Person实体类，包含age和sex两个属性。

2. 创建PersonItemReader类，继承JdbcCursorItemReader类，用于从db2中读取数据。

3. 创建PersonItemProcessor类，实现ItemProcessor接口，用于判断年龄是否大于18岁。

4. 创建PersonItemWriter类，继承JdbcBatchItemWriter类，用于将符合条件的数据写入到db2中。

5. 创建JobBuilderFactory、StepBuilderFactory和Job类，配置Job和Step，组装ItemReader、ItemProcessor和ItemWriter。

6. 运行Job，即可实现该逻辑代码。

具体实现代码如下：

Person.java:

public class Person {
    private int age;
    private String sex;
    // getter and setter
}

PersonItemReader.java:

public class PersonItemReader extends JdbcCursorItemReader<Person> {
    @Autowired
    public PersonItemReader(DataSource dataSource) {
        setDataSource(dataSource);
        setSql("select age, sex from person");
        setRowMapper(new BeanPropertyRowMapper<>(Person.class));
    }
}

PersonItemProcessor.java:

public class PersonItemProcessor implements ItemProcessor<Person, Person> {
    @Override
    public Person process(Person person) throws Exception {
        if (person.getAge() > 18) {
            return person;
        } else {
            return null;
        }
    }
}

PersonItemWriter.java:

public class PersonItemWriter extends JdbcBatchItemWriter<Person> {
    @Autowired
    public PersonItemWriter(DataSource dataSource) {
        setDataSource(dataSource);
        setSql("insert into person(age, sex) values (:age, :sex)");
        setItemSqlParameterSourceProvider(new BeanPropertyItemSqlParameterSourceProvider<>());
    }
}

Job and Step configuration:

@Configuration
@EnableBatchProcessing
public class BatchConfiguration {

    @Autowired
    private JobBuilderFactory jobBuilderFactory;

    @Autowired
    private StepBuilderFactory stepBuilderFactory;

    @Autowired
    private PersonItemReader personItemReader;

    @Autowired
    private PersonItemProcessor personItemProcessor;

    @Autowired
    private PersonItemWriter personItemWriter;

    @Bean
    public Job personJob() {
        return jobBuilderFactory.get("personJob")
                .incrementer(new RunIdIncrementer())
                .start(step())
                .build();
    }

    @Bean
    public Step step() {
        return stepBuilderFactory.get("step")
                .<Person, Person>chunk(10)
                .reader(personItemReader)
                .processor(personItemProcessor)
                .writer(personItemWriter)
                .build();
    }
}