基于spring batch，写一段示例代码，可以通过指定的param传入job和step中进行使用，step采取reader和wirter的读法

好的，以下是一个基于 Spring Batch 的示例代码，可以通过传入参数来指定 Job 和 Step，Step 中采用了 Reader 和 Writer 的方式进行读写：

import org.springframework.batch.core.Job;
import org.springframework.batch.core.JobParameters;
import org.springframework.batch.core.JobParametersBuilder;
import org.springframework.batch.core.Step;
import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;
import org.springframework.batch.core.configuration.annotation.JobBuilderFactory;
import org.springframework.batch.core.configuration.annotation.StepBuilderFactory;
import org.springframework.batch.core.launch.JobLauncher;
import org.springframework.batch.item.ItemProcessor;
import org.springframework.batch.item.ItemReader;
import org.springframework.batch.item.ItemWriter;
import org.springframework.batch.item.file.FlatFileItemReader;
import org.springframework.batch.item.file.mapping.BeanWrapperFieldSetMapper;
import org.springframework.batch.item.file.mapping.DefaultLineMapper;
import org.springframework.batch.item.file.transform.DelimitedLineTokenizer;
import org.springframework.batch.support.transaction.ResourcelessTransactionManager;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.FileSystemResource;

@Configuration
@EnableBatchProcessing
public class BatchConfiguration {
    
    @Autowired
    private JobBuilderFactory jobBuilderFactory;
    
    @Autowired
    private StepBuilderFactory stepBuilderFactory;
    
    @Autowired
    private JobLauncher jobLauncher;
    
    // 读取 CSV 文件的 Reader
    @Bean
    public FlatFileItemReader<Person> reader() {
        FlatFileItemReader<Person> reader = new FlatFileItemReader<>();
        reader.setResource(new FileSystemResource("persons.csv"));
        reader.setLineMapper(new DefaultLineMapper<Person>() {{
            setLineTokenizer(new DelimitedLineTokenizer() {{
                setNames(new String[] { "firstName", "lastName" });
            }});
            setFieldSetMapper(new BeanWrapperFieldSetMapper<Person>() {{
                setTargetType(Person.class);
            }});
        }});
        return reader;
    }
    
    // 处理 Person 对象的 Processor
    @Bean
    public ItemProcessor<Person, Person> processor() {
        return person -> {
            person.setFullName(person.getFirstName() + " " + person.getLastName());
            return person;
        };
    }
    
    // 将 Person 对象写入数据库的 Writer
    @Bean
    public ItemWriter<Person> writer() {
        return items -> {
            for (Person person : items) {
                System.out.println("Writing person: " + person.getFullName());
            }
        };
    }
    
    // Job
    @Bean
    public Job job() {
        return jobBuilderFactory.get("job")
                .start(step())
                .build();
    }
    
    // Step
    @Bean
    public Step step() {
        return stepBuilderFactory.get("step")
                .<Person, Person>chunk(10)
                .reader(reader())
                .processor(processor())
                .writer(writer())
                .build();
    }
    
    public void run(String jobName, String stepName) throws Exception {
        JobParameters jobParameters = new JobParametersBuilder()
                .addString("jobName", jobName)
                .addString("stepName", stepName)
                .toJobParameters();
        jobLauncher.run(jobRegistry.getJob(jobName), jobParameters);
    }
    
}

可以在运行时传入指定的 Job 和 Step 名称，例如：

BatchConfiguration batchConfiguration = new BatchConfiguration();
batchConfiguration.run("job", "step");

注意：以上代码仅为示例，实际使用时需要根据具体需求进行修改。