Add sample app for spring-projects/spring-batch#1064

gh1064/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+		 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+		 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+
+	<groupId>com.example</groupId>
+	<artifactId>demo</artifactId>
+	<version>0.0.1-SNAPSHOT</version>
+	<name>demo</name>
+
+	<properties>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+		<java.version>1.8</java.version>
+		<spring-batch-core.version>4.2.1.RELEASE</spring-batch-core.version>
+		<maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.springframework.batch</groupId>
+			<artifactId>spring-batch-core</artifactId>
+			<version>${spring-batch-core.version}</version>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<version>${maven-compiler-plugin.version}</version>
+				<configuration>
+					<source>${java.version}</source>
+					<target>${java.version}</target>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

gh1064/src/main/java/com/example/demo/FixedLengthBufferedReader.java

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+package com.example.demo;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.Reader;
+
+public class FixedLengthBufferedReader extends BufferedReader {
+
+	public static final int DEFAULT_LINE_LENGTH = 32;
+	private int length;
+
+	public FixedLengthBufferedReader(Reader in) {
+		this(in, DEFAULT_LINE_LENGTH);
+	}
+
+	public FixedLengthBufferedReader(Reader in, int length) {
+		super(in);
+		this.length = length;
+	}
+
+	// FIXME quick and dirty: add sanity checks, etc 
+	@Override
+	public String readLine() throws IOException {
+		int next = read();
+		if (next == -1) {
+			return null;
+		}
+		StringBuilder buffer = new StringBuilder();
+		buffer.append((char)next);
+		for (int i = 1; i < length; i++) {
+			next = read();
+			if (next != -1) {
+				buffer.append((char)next);
+			} else {
+				break;
+			}
+		}
+		return buffer.toString();
+	}
+}

gh1064/src/main/java/com/example/demo/MyJob.java

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+package com.example.demo;
+
+import java.io.InputStreamReader;
+
+import org.springframework.batch.core.Job;
+import org.springframework.batch.core.JobParameters;
+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.ItemWriter;
+import org.springframework.batch.item.file.FlatFileItemReader;
+import org.springframework.batch.item.file.builder.FlatFileItemReaderBuilder;
+import org.springframework.batch.item.file.mapping.PassThroughLineMapper;
+import org.springframework.context.ApplicationContext;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.core.io.ClassPathResource;
+
+@Configuration
+@EnableBatchProcessing
+public class MyJob {
+
+	@Bean
+	public FlatFileItemReader<String> itemReader() {
+		return new FlatFileItemReaderBuilder<String>()
+				.name("fragmentReader")
+				.resource(new ClassPathResource("data.txt"))
+				.lineMapper(new PassThroughLineMapper())
+				.bufferedReaderFactory((resource, encoding) ->
+						new FixedLengthBufferedReader(new InputStreamReader(resource.getInputStream(), encoding)))
+				.build();
+	}
+
+	@Bean
+	public ItemWriter<String> itemWriter() {
+		return items -> items.forEach(System.out::println);
+	}
+
+	@Bean
+	public Job job(JobBuilderFactory jobs, StepBuilderFactory steps) {
+		return jobs.get("job")
+				.start(steps.get("step")
+						.<String, String>chunk(2)
+						.reader(itemReader())
+						.writer(itemWriter())
+						.build())
+				.build();
+	}
+
+	public static void main(String[] args) throws Exception {
+		ApplicationContext context = new AnnotationConfigApplicationContext(MyJob.class);
+		JobLauncher jobLauncher = context.getBean(JobLauncher.class);
+		Job job = context.getBean(Job.class);
+		jobLauncher.run(job, new JobParameters());
+	}
+
+}

gh1064/src/main/resources/data.txt

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+Sale012016 1   00000011000000000Sale022017 2   00000022000000000Sale032018 3   00000033000000000