Use builders for reader/writers

complete/src/main/java/hello/BatchConfiguration.java

@@ -11,7 +11,9 @@ import org.springframework.batch.core.configuration.annotation.StepBuilderFactor
 import org.springframework.batch.core.launch.support.RunIdIncrementer;
 import org.springframework.batch.item.database.BeanPropertyItemSqlParameterSourceProvider;
 import org.springframework.batch.item.database.JdbcBatchItemWriter;
+import org.springframework.batch.item.database.builder.JdbcBatchItemWriterBuilder;
 import org.springframework.batch.item.file.FlatFileItemReader;
+import org.springframework.batch.item.file.builder.FlatFileItemReaderBuilder;
 import org.springframework.batch.item.file.mapping.BeanWrapperFieldSetMapper;
 import org.springframework.batch.item.file.mapping.DefaultLineMapper;
 import org.springframework.batch.item.file.transform.DelimitedLineTokenizer;
@@ -31,23 +33,18 @@ public class BatchConfiguration {
     @Autowired
     public StepBuilderFactory stepBuilderFactory;
 
-    @Autowired
-    public DataSource dataSource;
-
     // tag::readerwriterprocessor[]
     @Bean
     public FlatFileItemReader<Person> reader() {
-        FlatFileItemReader<Person> reader = new FlatFileItemReader<Person>();
-        reader.setResource(new ClassPathResource("sample-data.csv"));
-        reader.setLineMapper(new DefaultLineMapper<Person>() {{
-            setLineTokenizer(new DelimitedLineTokenizer() {{
-                setNames(new String[] { "firstName", "lastName" });
-            }});
-            setFieldSetMapper(new BeanWrapperFieldSetMapper<Person>() {{
+        return new FlatFileItemReaderBuilder<Person>()
+            .name("personItemReader")
+            .resource(new ClassPathResource("sample-data.csv"))
+            .delimited()
+            .names(new String[]{"firstName", "lastName"})
+            .fieldSetMapper(new BeanWrapperFieldSetMapper<Person>() {{
                 setTargetType(Person.class);
-            }});
-        }});
-        return reader;
+            }})
+            .build();
     }
 
     @Bean
@@ -56,34 +53,34 @@ public class BatchConfiguration {
     }
 
     @Bean
-    public JdbcBatchItemWriter<Person> writer() {
-        JdbcBatchItemWriter<Person> writer = new JdbcBatchItemWriter<Person>();
-        writer.setItemSqlParameterSourceProvider(new BeanPropertyItemSqlParameterSourceProvider<Person>());
-        writer.setSql("INSERT INTO people (first_name, last_name) VALUES (:firstName, :lastName)");
-        writer.setDataSource(dataSource);
-        return writer;
+    public JdbcBatchItemWriter<Person> writer(DataSource dataSource) {
+        return new JdbcBatchItemWriterBuilder<Person>()
+            .itemSqlParameterSourceProvider(new BeanPropertyItemSqlParameterSourceProvider<>())
+            .sql("INSERT INTO people (first_name, last_name) VALUES (:firstName, :lastName)")
+            .dataSource(dataSource)
+            .build();
     }
     // end::readerwriterprocessor[]
 
     // tag::jobstep[]
     @Bean
-    public Job importUserJob(JobCompletionNotificationListener listener) {
+    public Job importUserJob(JobCompletionNotificationListener listener, Step step1) {
         return jobBuilderFactory.get("importUserJob")
-                .incrementer(new RunIdIncrementer())
-                .listener(listener)
-                .flow(step1())
-                .end()
-                .build();
+            .incrementer(new RunIdIncrementer())
+            .listener(listener)
+            .flow(step1)
+            .end()
+            .build();
     }
 
     @Bean
-    public Step step1() {
+    public Step step1(JdbcBatchItemWriter<Person> writer) {
         return stepBuilderFactory.get("step1")
-                .<Person, Person> chunk(10)
-                .reader(reader())
-                .processor(processor())
-                .writer(writer())
-                .build();
+            .<Person, Person> chunk(10)
+            .reader(reader())
+            .processor(processor())
+            .writer(writer)
+            .build();
     }
     // end::jobstep[]
 }

complete/src/main/java/hello/JobCompletionNotificationListener.java

@@ -1,18 +1,12 @@
 package hello;
 
-import java.sql.ResultSet;
-import java.sql.SQLException;
-import java.util.List;
-
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
-
 import org.springframework.batch.core.BatchStatus;
 import org.springframework.batch.core.JobExecution;
 import org.springframework.batch.core.listener.JobExecutionListenerSupport;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.jdbc.core.JdbcTemplate;
-import org.springframework.jdbc.core.RowMapper;
 import org.springframework.stereotype.Component;
 
 @Component
@@ -32,17 +26,11 @@ public class JobCompletionNotificationListener extends JobExecutionListenerSuppo
 		if(jobExecution.getStatus() == BatchStatus.COMPLETED) {
 			log.info("!!! JOB FINISHED! Time to verify the results");
 
-			List<Person> results = jdbcTemplate.query("SELECT first_name, last_name FROM people", new RowMapper<Person>() {
-				@Override
-				public Person mapRow(ResultSet rs, int row) throws SQLException {
-					return new Person(rs.getString(1), rs.getString(2));
-				}
-			});
-
-			for (Person person : results) {
-				log.info("Found <" + person + "> in the database.");
-			}
-
+			jdbcTemplate.query("SELECT first_name, last_name FROM people",
+				(rs, row) -> new Person(
+					rs.getString(1),
+					rs.getString(2))
+			).forEach(person -> log.info("Found <" + person + "> in the database."));
 		}
 	}
 }

complete/src/main/java/hello/Person.java

@@ -1,11 +1,11 @@
 package hello;
 
 public class Person {
+
     private String lastName;
     private String firstName;
 
     public Person() {
-
     }
 
     public Person(String firstName, String lastName) {