Add java configuration for the fixed length file import sample

Issue #3663

spring-batch-samples/README.md

@@ -171,43 +171,10 @@ from a delimited file, processing it and writing it to another file.
 
 ### Fixed Length Import Job
 
-The goal is to demonstrate a typical scenario of importing data
-from a fixed-length file to database
-
-This job shows a typical scenario, when reading input data and
-processing the data is cleanly separated. The data provider is
-responsible for reading input and mapping each record to a domain
-object, which is then passed to the module processor. The module
-processor handles the processing of the domain objects, in this case
-it only writes them to database.
-
-In this example we are using a simple fixed length record structure
-that can be found in the project at
-`data/iosample/input`.  A considerable amount of
-thought can go into designing the folder structures for batch file
-management.  The fixed length records look like this:
-
-    UK21341EAH4597898.34customer1
-    UK21341EAH4611218.12customer2
-    UK21341EAH4724512.78customer2
-    UK21341EAH48108109.25customer3
-    UK21341EAH49854123.39customer4
-
-Looking back to the configuration file you will see where this is
-documented in the property of the `FixedLengthTokenizer`. You can
-infer the following properties:
-
-
-FieldName | Length
---------- | :----:
-ISIN      |   12  
-Quantity  |   3
-Price     |   5
-Customer  |   9
-
-*Output target:* database - writes the data to database using a DAO
-object
+The goal is to demonstrate a typical scenario of reading data
+from a fixed length file, processing it and writing it to another file.
 
+[Fixed Length Import Job sample](./src/main/java/org/springframework/batch/sample/file/fixed/README.md)
 
 ### Football Job
 

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/jobs/iosample/fixedLength.xml → 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">

spring-batch-samples/src/test/java/org/springframework/batch/sample/file/fixed/FixedLengthFunctionalTests.java

@@ -0,0 +1,75 @@
+/*
+ * Copyright 2006-2023 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.batch.sample.file.fixed;
+
+import org.junit.jupiter.api.Test;
+
+import org.springframework.batch.core.BatchStatus;
+import org.springframework.batch.core.Job;
+import org.springframework.batch.core.JobExecution;
+import org.springframework.batch.core.JobParameters;
+import org.springframework.batch.core.JobParametersBuilder;
+import org.springframework.batch.core.launch.JobLauncher;
+import org.springframework.batch.test.JobLauncherTestUtils;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+import org.springframework.test.context.junit.jupiter.SpringJUnitConfig;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+@SpringJUnitConfig(locations = { "/org/springframework/batch/sample/file/fixed/job/fixedLength.xml",
+		"/simple-job-launcher-context.xml", "/job-runner-context.xml" })
+class FixedLengthFunctionalTests {
+
+	@Autowired
+	private JobLauncherTestUtils jobLauncherTestUtils;
+
+	@Test
+	void testLaunchJobWithXmlConfig() throws Exception {
+		// given
+		JobParameters jobParameters = new JobParametersBuilder()
+			.addString("inputFile", "org/springframework/batch/sample/file/fixed/data/fixedLength.txt")
+			.addString("outputFile", "file:./target/test-outputs/fixedLengthOutput.txt")
+			.toJobParameters();
+
+		// when
+		JobExecution jobExecution = this.jobLauncherTestUtils.launchJob(jobParameters);
+
+		// then
+		assertEquals(BatchStatus.COMPLETED, jobExecution.getStatus());
+	}
+
+	@Test
+	public void testLaunchJobWithJavaConfig() throws Exception {
+		// given
+		ApplicationContext context = new AnnotationConfigApplicationContext(FixedLengthJobConfiguration.class);
+		JobLauncher jobLauncher = context.getBean(JobLauncher.class);
+		Job job = context.getBean(Job.class);
+		JobParameters jobParameters = new JobParametersBuilder()
+			.addString("inputFile", "org/springframework/batch/sample/file/fixed/data/fixedLength.txt")
+			.addString("outputFile", "file:./target/test-outputs/fixedLengthOutput.txt")
+			.toJobParameters();
+
+		// when
+		JobExecution jobExecution = jobLauncher.run(job, jobParameters);
+
+		// then
+		assertEquals(BatchStatus.COMPLETED, jobExecution.getStatus());
+	}
+
+}