Add java configuration for the fixed length file import sample

Issue #3663

spring-batch-samples/src/main/java/org/springframework/batch/sample/file/fixed/FixedLengthJobConfiguration.java

@@ -0,0 +1,85 @@
+package org.springframework.batch.sample.file.fixed;
+
+import javax.sql.DataSource;
+
+import org.springframework.batch.core.Job;
+import org.springframework.batch.core.configuration.annotation.EnableBatchProcessing;
+import org.springframework.batch.core.configuration.annotation.StepScope;
+import org.springframework.batch.core.job.builder.JobBuilder;
+import org.springframework.batch.core.repository.JobRepository;
+import org.springframework.batch.core.step.builder.StepBuilder;
+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.FlatFileItemWriter;
+import org.springframework.batch.item.file.builder.FlatFileItemReaderBuilder;
+import org.springframework.batch.item.file.builder.FlatFileItemWriterBuilder;
+import org.springframework.batch.item.file.transform.Range;
+import org.springframework.batch.sample.domain.trade.CustomerCredit;
+import org.springframework.batch.sample.domain.trade.internal.CustomerCreditIncreaseProcessor;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.io.Resource;
+import org.springframework.core.io.WritableResource;
+import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseBuilder;
+import org.springframework.jdbc.datasource.embedded.EmbeddedDatabaseType;
+import org.springframework.jdbc.support.JdbcTransactionManager;
+
+@Configuration
+@EnableBatchProcessing
+public class FixedLengthJobConfiguration {
+
+	@Bean
+	@StepScope
+	public FlatFileItemReader<CustomerCredit> itemReader(@Value("#{jobParameters[inputFile]}") Resource resource) {
+		return new FlatFileItemReaderBuilder<CustomerCredit>().name("itemReader")
+			.resource(resource)
+			.fixedLength()
+			.columns(new Range(1, 9), new Range(10, 11))
+			.names("name", "credit")
+			.targetType(CustomerCredit.class)
+			.build();
+	}
+
+	@Bean
+	@StepScope
+	public FlatFileItemWriter<CustomerCredit> itemWriter(
+			@Value("#{jobParameters[outputFile]}") WritableResource resource) {
+		return new FlatFileItemWriterBuilder<CustomerCredit>().name("itemWriter")
+			.resource(resource)
+			.formatted()
+			.format("%-9s%-2.0f")
+			.names("name", "credit")
+			.build();
+	}
+
+	@Bean
+	public Job job(JobRepository jobRepository, JdbcTransactionManager transactionManager,
+			ItemReader<CustomerCredit> itemReader, ItemWriter<CustomerCredit> itemWriter) {
+		return new JobBuilder("ioSampleJob", jobRepository)
+			.start(new StepBuilder("step1", jobRepository).<CustomerCredit, CustomerCredit>chunk(2, transactionManager)
+				.reader(itemReader)
+				.processor(new CustomerCreditIncreaseProcessor())
+				.writer(itemWriter)
+				.build())
+			.build();
+	}
+
+	// Infrastructure beans
+
+	@Bean
+	public DataSource dataSource() {
+		return new EmbeddedDatabaseBuilder().setType(EmbeddedDatabaseType.HSQL)
+			.addScript("/org/springframework/batch/core/schema-drop-hsqldb.sql")
+			.addScript("/org/springframework/batch/core/schema-hsqldb.sql")
+			.generateUniqueName(true)
+			.build();
+	}
+
+	@Bean
+	public JdbcTransactionManager transactionManager(DataSource dataSource) {
+		return new JdbcTransactionManager(dataSource);
+	}
+
+}

spring-batch-samples/src/main/java/org/springframework/batch/sample/file/fixed/README.md

@@ -0,0 +1,41 @@
+### Fixed Length File Import Job
+
+## About
+
+The goal is to demonstrate a typical scenario of reading data
+from a fixed length file, processing it and writing it to another file.
+
+In this example we are using a simple fixed length record structure
+that can be found in the project at
+`src/main/resources/org/springframework/batch/sample/file/fixed/data`.
+The fixed length records look like this:
+
+```
+customer110
+customer220
+customer330
+customer440
+customer550
+customer660
+```
+
+Looking back to the configuration of the reader you will this is
+configured in the fixed column ranges:
+
+FieldName | Range
+--------- | :----:
+name      |   1,9  
+credit    |   10,11
+
+## Run the sample
+
+You can run the sample from the command line as following:
+
+```
+$>cd spring-batch-samples
+# Launch the sample using the XML configuration
+$>../mvnw -Dtest=FixedLengthFunctionalTests#testLaunchJobWithXmlConfig test
+# Launch the sample using the Java configuration
+$>../mvnw -Dtest=FixedLengthFunctionalTests#testLaunchJobWithJavaConfig test
+```
+

spring-batch-samples/src/main/resources/org/springframework/batch/sample/file/fixed/job/fixedLength.xml

@@ -1,9 +1,22 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <beans xmlns="http://www.springframework.org/schema/beans"
-	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-	xsi:schemaLocation="
+	   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	   xmlns:batch="http://www.springframework.org/schema/batch"
+	   xsi:schemaLocation="
+		http://www.springframework.org/schema/batch https://www.springframework.org/schema/batch/spring-batch.xsd
 		http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd">
 
+	<batch:job id="ioSampleJob" xmlns="http://www.springframework.org/schema/batch">
+		<batch:step id="step1">
+			<batch:tasklet>
+				<batch:chunk reader="itemReader" processor="itemProcessor" writer="itemWriter"
+							 commit-interval="2"/>
+			</batch:tasklet>
+		</batch:step>
+	</batch:job>
+
+	<bean id="itemProcessor" class="org.springframework.batch.sample.domain.trade.internal.CustomerCreditIncreaseProcessor" />
+
 	<bean id="itemReader" class="org.springframework.batch.item.file.FlatFileItemReader" scope="step">
 		<property name="resource" value="#{jobParameters[inputFile]}" />
 		<property name="lineMapper">