{"id":124730,"date":"2024-07-18T10:31:51","date_gmt":"2024-07-18T07:31:51","guid":{"rendered":"https:\/\/www.javacodegeeks.com\/?p=124730"},"modified":"2024-07-17T15:36:00","modified_gmt":"2024-07-17T12:36:00","slug":"xml-file-processing-with-spring-batch","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/xml-file-processing-with-spring-batch.html","title":{"rendered":"XML File Processing with Spring Batch"},"content":{"rendered":"<p><a href=\"https:\/\/spring.io\/projects\/spring-batch\" target=\"_blank\" rel=\"noreferrer noopener\">Spring Batch<\/a> provides essential functionalities such as transaction management, job processing statistics, job restart capabilities, and more. One of its key features is the ability to handle large volumes of data efficiently. In this article, we&#8217;ll delve into using Spring Batch for reading from and writing to XML files with <code>StaxEventItemReader<\/code> and <code>StaxEventItemWriter<\/code>.<\/p>\n<h2 class=\"wp-block-heading\">1. Introduction<\/h2>\n<p>When it comes to XML file processing, Spring Batch makes it straightforward to read XML records, map them to Java objects, and write Java objects back as XML records. This is accomplished using <code>StaxEventItemReader<\/code> for reading and <code>StaxEventItemWriter<\/code> for writing, with the help of Jakarta Binding formerly known as JAXB (Java Architecture for XML Binding) for marshalling and unmarshalling XML data. <\/p>\n<p>The <code>StaxEventItemReader<\/code> reads XML files and is suitable for processing large XML files. It uses JAXB to unmarshal XML data into Java objects. Similarly, the <code>StaxEventItemWriter<\/code> marshals Java objects back into XML format using JAXB and writes them to an XML file. <\/p>\n<p>In the following sections, we will demonstrate how to set up a Spring Batch project with Maven, define our XML schema and corresponding Java model classes, configure the reader and writer, and execute a complete batch job.<\/p>\n<h2 class=\"wp-block-heading\">2. Project Setup<\/h2>\n<p><strong>Maven <code>pom.xml<\/code> Configuration<\/strong><\/p>\n<p>First, let&#8217;s set up our Maven <code>pom.xml<\/code> file with the necessary dependencies:<\/p>\n<pre class=\"brush:xml\">\n    &lt;dependencies&gt;       \n        &lt;dependency&gt;\n            &lt;groupId&gt;org.springframework.boot&lt;\/groupId&gt;\n            &lt;artifactId&gt;spring-boot-starter-batch&lt;\/artifactId&gt;\n        &lt;\/dependency&gt;\n\n        &lt;!-- JAXB dependencies --&gt;\n        &lt;dependency&gt;\n            &lt;groupId&gt;jakarta.xml.bind&lt;\/groupId&gt;\n            &lt;artifactId&gt;jakarta.xml.bind-api&lt;\/artifactId&gt;\n        &lt;\/dependency&gt;\n        &lt;dependency&gt;\n            &lt;groupId&gt;org.glassfish.jaxb&lt;\/groupId&gt;\n            &lt;artifactId&gt;jaxb-runtime&lt;\/artifactId&gt;\n        &lt;\/dependency&gt;\n\n        &lt;!-- Spring OXM (Object\/XML Mapping) --&gt;\n        &lt;dependency&gt;\n            &lt;groupId&gt;org.springframework&lt;\/groupId&gt;\n            &lt;artifactId&gt;spring-oxm&lt;\/artifactId&gt;\n        &lt;\/dependency&gt;\n\n        &lt;dependency&gt;\n            &lt;groupId&gt;com.h2database&lt;\/groupId&gt;\n            &lt;artifactId&gt;h2&lt;\/artifactId&gt;\n            &lt;scope&gt;runtime&lt;\/scope&gt;\n        &lt;\/dependency&gt;\n    &lt;\/dependencies&gt;\n<\/pre>\n<ul class=\"wp-block-list\">\n<li><strong>Spring Batch Dependencies<\/strong>: These dependencies include the core and infrastructure libraries required for Spring Batch functionality.<\/li>\n<li><strong>Spring OXM<\/strong>: This dependency includes the Spring Object\/XML Mapping module, which integrates JAXB with Spring Batch.<\/li>\n<li><strong>JAXB Dependencies<\/strong>: These dependencies include the JAXB API and runtime implementations, enabling the marshalling and unmarshalling of XML data to and from Java objects.<\/li>\n<\/ul>\n<p><strong>Example XML File<\/strong><\/p>\n<p>Let&#8217;s define a sample XML file (<code>input.xml<\/code>) that we will read and process:<\/p>\n<pre class=\"brush:xml\">\n&lt;?xml version=\"1.0\" encoding=\"UTF-8\"?&gt;\n&lt;employees&gt;\n    &lt;employee&gt;\n        &lt;id&gt;1&lt;\/id&gt;\n        &lt;name&gt;John Franklin&lt;\/name&gt;\n        &lt;department&gt;Sales&lt;\/department&gt;\n    &lt;\/employee&gt;\n    &lt;employee&gt;\n        &lt;id&gt;2&lt;\/id&gt;\n        &lt;name&gt;Thomas Smith&lt;\/name&gt;\n        &lt;department&gt;HR&lt;\/department&gt;\n    &lt;\/employee&gt;\n    &lt;employee&gt;\n        &lt;id&gt;3&lt;\/id&gt;\n        &lt;name&gt;Adams Jefferson&lt;\/name&gt;\n        &lt;department&gt;Accounts&lt;\/department&gt;\n    &lt;\/employee&gt;\n&lt;\/employees&gt;\n\n<\/pre>\n<p>Next, define the data model class and the Jakarta Binding (JAXB) annotations for XML binding.<div style=\"display:inline-block; margin: 15px 0;\"> <div id=\"adngin-JavaCodeGeeks_incontent_video-0\" style=\"display:inline-block;\"><\/div> <\/div><\/p>\n<pre class=\"brush:java\">\n@XmlRootElement(name = \"employee\")\npublic class Employee {\n\n    private int id;\n    private String name;\n    private String department;\n\n    public Employee() {\n    }\n\n    public Employee(int id, String name, String department) {\n        this.id = id;\n        this.name = name;\n        this.department = department;\n    }\n\n    @XmlElement(name = \"id\")\n    public int getId() {\n        return id;\n    }\n\n    public void setId(int id) {\n        this.id = id;\n    }\n\n    @XmlElement(name = \"name\")\n    public String getName() {\n        return name;\n    }\n\n    public void setName(String name) {\n        this.name = name;\n    }\n\n    @XmlElement(name = \"department\")\n    public String getDepartment() {\n        return department;\n    }\n\n    public void setDepartment(String department) {\n        this.department = department;\n    }\n\n    @Override\n    public String toString() {\n        return \"Employee [id=\" + id + \", name=\" + name + \", department=\" + department + \"]\";\n    }\n}\n\n<\/pre>\n<p>The above <code>Employee<\/code> class is annotated with JAXB annotations to map its fields to XML elements. Here&#8217;s a breakdown of the annotations used:<\/p>\n<ul class=\"wp-block-list\">\n<li><strong>@XmlRootElement<\/strong>: This annotation specifies the root element of the XML structure. <\/li>\n<li><strong>@XmlElement<\/strong>: This annotation is used on getter methods to specify that the corresponding field should be an XML element. Each field (id, name, department) in the <code>Employee<\/code> class is annotated with <code>@XmlElement<\/code>, indicating that they should be mapped to XML elements with the same name as the fields.<\/li>\n<\/ul>\n<h2 class=\"wp-block-heading\">3. StaxEventItemReader Configuration<\/h2>\n<p>Before we dive into the full batch job configuration, let&#8217;s separate and focus on the configuration of the XML reader. This configuration ensures that our application can efficiently read and map XML records to Java objects.<\/p>\n<pre class=\"brush:java\">\n@Configuration\npublic class ReaderConfig {\n    \n    @Bean\n    @StepScope\n    public StaxEventItemReader&lt;Employee&gt; reader() {\n        \n        Jaxb2Marshaller unmarshaller = new Jaxb2Marshaller();\n        unmarshaller.setClassesToBeBound(Employee.class);\n\n        return new StaxEventItemReaderBuilder&lt;Employee&gt;()\n                .name(\"employeeReader\")\n                .resource(new ClassPathResource(\"input.xml\"))\n                .addFragmentRootElements(\"employee\")\n                .unmarshaller(unmarshaller)\n                .build();\n    }\n}\n<\/pre>\n<p>The above <code>ReaderConfig<\/code> class configures the <code>StaxEventItemReader<\/code> for reading XML files. It uses <code>Jaxb2Marshaller<\/code> to unmarshal XML data into <code>Employee<\/code> objects. Here is an explanation of what the <code>reader<\/code> method does:<\/p>\n<ul class=\"wp-block-list\">\n<li><strong>Jaxb2Marshaller<\/strong>: This is configured with the <code>Employee<\/code> class to handle the unmarshalling process.<\/li>\n<li><strong>StaxEventItemReaderBuilder<\/strong>: This builds the <code>StaxEventItemReader<\/code> with the specified name, resource (input XML file), root element (<code>employee<\/code>), and the configured <code>unmarshaller<\/code>.<\/li>\n<\/ul>\n<h2 class=\"wp-block-heading\">4. StaxEventItemWriter Configuration<\/h2>\n<p>Next, let&#8217;s configure the XML writer. This setup allows our application to marshal Java objects back into an XML format and write them to a specified file.<\/p>\n<pre class=\"brush:java\">\n@Configuration\npublic class WriterConfig {\n    \n    @Bean\n    public StaxEventItemWriter&lt;Employee&gt; writer() {\n        Jaxb2Marshaller marshaller = new Jaxb2Marshaller();\n        marshaller.setClassesToBeBound(Employee.class);\n\n        return new StaxEventItemWriterBuilder&lt;Employee&gt;()\n                .name(\"employeeWriter\")\n                .resource(new FileSystemResource(\"output.xml\"))\n                .marshaller(marshaller)\n                .rootTagName(\"employees\")\n                .build();\n    }\n}\n\n<\/pre>\n<p>The above <code>WriterConfig<\/code> class configures the <code>StaxEventItemWriter<\/code> for writing XML files. It uses <code>Jaxb2Marshaller<\/code> to marshal <code>Employee<\/code> objects into XML data. Here is an explanation of what the <code>writer<\/code> method does:<\/p>\n<ul class=\"wp-block-list\">\n<li><strong>Jaxb2Marshaller<\/strong>: This is configured with the <code>Employee<\/code> class to handle the marshalling process.<\/li>\n<li><strong>StaxEventItemWriterBuilder<\/strong>: This builds the <code>StaxEventItemWriter<\/code> with the specified name, resource (output XML file), marshaller, and the root tag name (<code>employees<\/code>).<\/li>\n<\/ul>\n<h2 class=\"wp-block-heading\">5. Full Batch Configuration<\/h2>\n<p>Now that we have separated configurations for reading and writing XML files, let&#8217;s integrate these components into a complete batch job. This configuration will define the job, steps, and necessary processors to process the data from start to finish.<\/p>\n<pre class=\"brush:java\">\n@SpringBootApplication\npublic class SpringBatchXmlApplication {\n\n    @Bean\n    @StepScope\n    public StaxEventItemReader reader() {\n\n        Jaxb2Marshaller unmarshaller = new Jaxb2Marshaller();\n        unmarshaller.setClassesToBeBound(Employee.class);\n\n        return new StaxEventItemReaderBuilder()\n                .name(\"employeeReader\")\n                .resource(new ClassPathResource(\"input.xml\"))\n                .addFragmentRootElements(\"employee\")\n                .unmarshaller(unmarshaller)\n                .build();\n    }\n\n    @Bean\n    public StaxEventItemWriter writer() {\n        Jaxb2Marshaller marshaller = new Jaxb2Marshaller();\n        marshaller.setClassesToBeBound(Employee.class);\n\n        return new StaxEventItemWriterBuilder()\n                .name(\"employeeWriter\")\n                .resource(new FileSystemResource(\"output.xml\"))\n                .marshaller(marshaller)\n                .rootTagName(\"employees\")\n                .build();\n    }\n\n    @Bean\n    public ItemProcessor processor() {\n        return employee -&gt; {\n            \/\/ Example processor logic\n            employee.setName(employee.getName().toUpperCase());\n            System.out.println(\"Name: \" + employee.getName() + \", Department: \" + employee.getDepartment() );\n            return employee;\n        };\n    }\n\n    @Bean\n    Job job(Step step1, JobRepository jobRepository) {\n\n        var builder = new JobBuilder(\"job\", jobRepository);\n        return builder\n                .start(step1)\n                .build();\n    }\n\n    @Bean\n    public Step step1(StaxEventItemReader reader,\n            StaxEventItemWriter writer,\n            JobRepository jobRepository,\n            PlatformTransactionManager transactionManager) {\n\n        var builder = new StepBuilder(\"step1\", jobRepository);\n        return builder\n                .chunk(1, transactionManager)\n                .reader(reader)\n                .processor(processor())\n                .writer(writer)\n                .build();\n    }\n\n    public static void main(String[] args) {\n        SpringApplication.run(SpringBatchXmlApplication.class, args);\n    }\n\n}\n<\/pre>\n<p>This block of code configures a batch job to read from an XML file, process the data, and write the results back to another XML file. In addition to the <code>StaxEventItemReader<\/code> and <code>StaxEventItemWriter<\/code>, we define a bean for <code>ItemProcessor<\/code> which processes each <code>Employee<\/code> object by converting the employee&#8217;s name to uppercase and prints the employee&#8217;s name and department. <\/p>\n<p>The <code>job<\/code> method defines a batch job that starts with <code>step1<\/code>. The job builder uses a <code>JobRepository<\/code> to manage job execution details. <\/p>\n<p>The <code>step1<\/code> method defines a step named <code>step1<\/code>. It uses the reader, processor, and writer beans, with a chunk size of 1. The <code>StepBuilder<\/code> manages step execution details using the <code>JobRepository<\/code> and <code>PlatformTransactionManager<\/code>.<\/p>\n<p><strong>Log Output<\/strong><\/p>\n<p>When the application code is run, the console log output is:<\/p>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2024\/07\/springbatchxml.png\"><img decoding=\"async\" width=\"585\" height=\"259\" src=\"https:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2024\/07\/springbatchxml.png\" alt=\"Figure 1: Example Output from XML Item Reader and Writer\" class=\"wp-image-124914\" srcset=\"https:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2024\/07\/springbatchxml.png 585w, https:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2024\/07\/springbatchxml-300x133.png 300w\" sizes=\"(max-width: 585px) 100vw, 585px\" \/><\/a><\/figure>\n<\/div>\n<h2 class=\"wp-block-heading\">6. Conclusion<\/h2>\n<p>In this article, we explored how to leverage Spring Batch for XML file processing using <code>StaxEventItemReader<\/code> and <code>StaxEventItemWriter<\/code>. We started by configuring our Maven project with the necessary dependencies, and then we defined our data model class with JAXB annotations for XML binding.<\/p>\n<p>We demonstrated how to set up <code>StaxEventItemReader<\/code> to read XML files and map them to Java objects, and the <code>StaxEventItemWriter<\/code> to marshal Java objects back into XML format. The provided batch configuration integrated these components into a complete Spring Batch job, including a simple processor for data transformation.<\/p>\n<h2 class=\"wp-block-heading\">7. Download the Source Code<\/h2>\n<p>This was an article on XML item reader and writer.<\/p>\n<div class=\"download\"><strong>Download<\/strong><br \/>\nYou can download the full source code of this example here: <a href=\"https:\/\/www.javacodegeeks.com\/wp-content\/uploads\/2024\/07\/SpringBatchXmlApplication.zip\"><strong>XML Item Reader and Writer<\/strong><\/a>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Spring Batch provides essential functionalities such as transaction management, job processing statistics, job restart capabilities, and more. One of its key features is the ability to handle large volumes of data efficiently. In this article, we&#8217;ll delve into using Spring Batch for reading from and writing to XML files with StaxEventItemReader and StaxEventItemWriter. 1. Introduction &hellip;<\/p>\n","protected":false},"author":128888,"featured_media":240,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8],"tags":[2875,691,2885,2886,2887],"class_list":["post-124730","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-enterprise-java","tag-batch-processing","tag-spring-batch","tag-staxeventitemreader","tag-staxeventitemwriter","tag-xml-processing"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>XML File Processing with Spring Batch - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"Learn to configure Spring Batch with XML Item Reader and Writer using StaxEventItemReader and StaxEventItemWriter in Spring Boot.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.javacodegeeks.com\/xml-file-processing-with-spring-batch.html\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"XML File Processing with Spring Batch - 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