Spring Batch XML 到 MySQL


在本章中,我们将创建一个使用XML Reader和MySQL Writer的Spring Batch应用程序。

Reader - 我们在应用程序中使用的阅读器是 StaxEventItemReader ,用于从XML文档中读取数据。

以下是我们在此应用程序中使用的输入XML文档。本文档包含数据记录,这些记录指定了教程ID,教程作者,教程标题,提交日期,教程图标和教程描述等详细信息。

<?xml version="1.0" encoding="UTF-8"?>
<tutorials>
   <tutorial>      
      <tutorial_id>1001</tutorial_id>
      <tutorial_author>Sanjay</tutorial_author>
      <tutorial_title>Learn Java</tutorial_title>
      <submission_date>06-05-2007</submission_date>
      <tutorial_icon>https://www.codingdict.com/java/images/java-minilogo.jpg</tutorial_icon>
      <tutorial_description>Java is a high-level programming language originally
         developed by Sun Microsystems and released in 1995.
         Java runs on a variety of platforms.
         This tutorial gives a complete understanding of Java.');</tutorial_description>
   </tutorial>

   <tutorial>      
      <tutorial_id>1002</tutorial_id>
      <tutorial_author>Abdul S</tutorial_author>
      <tutorial_title>Learn MySQL</tutorial_title>
      <submission_date>19-04-2007</submission_date>
      <tutorial_icon>https://www.codingdict.com/mysql/images/mysql-minilogo.jpg</tutorial_icon>
      <tutorial_description>MySQL is the most popular
         Open Source Relational SQL database management system.
         MySQL is one of the best RDBMS being used for developing web-based software applications.
         This tutorial will give you quick start with MySQL
         and make you comfortable with MySQL programming.</tutorial_description>
   </tutorial>

   <tutorial>
      <tutorial_id>1003</tutorial_id>
      <tutorial_author>Krishna Kasyap</tutorial_author>
      <tutorial_title>Learn JavaFX</tutorial_title>
      <submission_date>06-07-2017</submission_date>
      <tutorial_icon>https://www.codingdict.com/javafx/images/javafx-minilogo.jpg</tutorial_icon>
      <tutorial_description>JavaFX is a Java library used to build Rich Internet Applications.
         The applications developed using JavaFX can run on various devices
         such as Desktop Computers, Mobile Phones, TVs, Tablets, etc.
         This tutorial, discusses all the necessary elements of JavaFX that are required
         to develop effective Rich Internet Applications</tutorial_description>
   </tutorial>
</tutorials>

writer -的 writer ,我们正在使用的应用程序是 JdbcBatchItemWriter 将数据写入到MySQL数据库。假设我们在MySQL中创建了一个名为 “details” 的数据库中的表。

CREATE TABLE details.TUTORIALS(
   tutorial_id int(10) NOT NULL,
   tutorial_author VARCHAR(20),
   tutorial_title VARCHAR(50),
   submission_date VARCHAR(20),
   tutorial_icon VARCHAR(200),
   tutorial_description VARCHAR(1000)
);

处理器 - 我们在应用程序中使用的处理器是一个自定义处理器,它将每个记录的数据写入PDF文档。

在批处理过程中,如果读取了 “n” 个 记录或数据元素,那么对于每个记录,它将读取数据,处理它,并在Writer中写入数据。为了处理数据,它在传递的处理器上进行中继。在这种情况下,在自定义处理器类中,我们编写了代码来加载特定的PDF文档,创建新页面,以表格格式将数据项写入PDF。

最后,如果您执行此应用程序,它将从XML文档中读取所有数据项,将它们存储在MySQL数据库中,并在给定的PDF文档中将它们打印在各个页面中。

jobConfig.xml

以下是我们的示例Spring Batch应用程序的配置文件。在此文件中,我们将定义作业和步骤。除此之外,我们还为ItemReader,ItemProcessor和ItemWriter定义了bean。(这里,我们将它们与各自的类相关联,并传递所需属性的值以进行配置。)

<beans xmlns = "http://www.springframework.org/schema/beans"
   xmlns:batch = "http://www.springframework.org/schema/batch"
   xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
   xmlns:util = "http://www.springframework.org/schema/util"
   xsi:schemaLocation = "http://www.springframework.org/schema/batch

      http://www.springframework.org/schema/batch/spring-batch-2.2.xsd
      http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
      http://www.springframework.org/schema/util     
      http://www.springframework.org/schema/util/spring-util-3.0.xsd ">  

   <import resource = "../jobs/context.xml" />

   <bean id = "itemProcessor" class = "CustomItemProcessor" />
   <batch:job id = "helloWorldJob">
      <batch:step id = "step1">
         <batch:tasklet>           
            <batch:chunk reader = "xmlItemReader" writer = "mysqlItemWriter" processor = "itemProcessor">
            </batch:chunk>
         </batch:tasklet>
      </batch:step>
   </batch:job>

   <bean id = "xmlItemReader"
      class = "org.springframework.batch.item.xml.StaxEventItemReader">
      <property name = "fragmentRootElementName" value = "tutorial" />
      <property name = "resource" value = "classpath:resources/tutorial.xml" />
      <property name = "unmarshaller" ref = "customUnMarshaller" />
   </bean>

   <bean id = "customUnMarshaller" class = "org.springframework.oxm.xstream.XStreamMarshaller">
      <property name = "aliases">
         <util:map id = "aliases">
            <entry key = "tutorial" value = "Tutorial" />            
         </util:map>
      </property>
   </bean>  
   <bean id = "mysqlItemWriter" class = "org.springframework.batch.item.database.JdbcBatchItemWriter">
      <property name = "dataSource" ref = "dataSource" />
      <property name = "sql">
         <value>
            <![CDATA[insert into details.tutorials (tutorial_id, tutorial_author, tutorial_title,
               submission_date, tutorial_icon, tutorial_description)
               values (:tutorial_id, :tutorial_author, :tutorial_title, :submission_date,
               :tutorial_icon, :tutorial_description);]]>
         </value>
      </property>   

      <property name = "itemSqlParameterSourceProvider">
         <bean class = "org.springframework.batch.item.database.BeanPropertyItemSqlParameterSourceProvider" />
      </property>
   </bean>
</beans>

context.xml

以下是我们的Spring Batch应用程序的 context.xml 。在此文件中,我们将定义诸如作业存储库,作业启动程序和事务管理器之类的bean。

<beans xmlns = "http://www.springframework.org/schema/beans"
   xmlns:jdbc = "http://www.springframework.org/schema/jdbc"
   xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation = "http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
      http://www.springframework.org/schema/jdbc
      http://www.springframework.org/schema/jdbc/spring-jdbc-3.2.xsd">

   <!-- stored job-meta in database -->
   <bean id = "jobRepository"
      class = "org.springframework.batch.core.repository.support.JobRepositoryFactoryBean">
      <property name = "dataSource" ref = "dataSource" />
      <property name = "transactionManager" ref = "transactionManager" />
      <property name = "databaseType" value = "mysql" />
   </bean>  

   <bean id = "transactionManager"
   class = "org.springframework.batch.support.transaction.ResourcelessTransactionMana ger" />  
   <bean id = "jobLauncher"
      class = "org.springframework.batch.core.launch.support.SimpleJobLauncher">
      <property name = "jobRepository" ref = "jobRepository" />
   </bean>

   <!-- connect to MySQL database -->
   <bean id = "dataSource"
      class = "org.springframework.jdbc.datasource.DriverManagerDataSource">
      <property name = "driverClassName" value = "com.mysql.jdbc.Driver" />
      <property name = "url" value = "jdbc:mysql://localhost:3306/details" />
      <property name = "username" value = "myuser" />
      <property name = "password" value = "password" />
   </bean>  

   <!-- create job-meta tables automatically -->
   <jdbc:initialize-database data-source = "dataSource">   
      <jdbc:script location = "org/springframework/batch/core/schema-drop-mysql.sql"/>   
      <jdbc:script location = "org/springframework/batch/core/schema-mysql.sql"/>
   </jdbc:initialize-database>
</beans>

CustomItemProcessor.java

以下是 处理器 类。在这个类中,我们在应用程序中编写处理代码。在这里,我们正在加载PDF文档,创建新页面,创建表格,并为每条记录插入以下值:教程ID,教程名称,作者,表格中的提交日期。

import java.io.File;
import java.io.IOException;  

import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDPageContentStream;
import org.apache.pdfbox.pdmodel.font.PDType1Font;
import org.springframework.batch.item.ItemProcessor;  

public class CustomItemProcessor implements ItemProcessor<Tutorial, Tutorial> {  

   public static void drawTable(PDPage page, PDPageContentStream contentStream,
      float y, float margin, String[][] content) throws IOException {
      final int rows = content.length;
      final int cols = content[0].length;
      final float rowHeight = 50;
      final float tableWidth = page.getMediaBox().getWidth()-(2*margin);
      final float tableHeight = rowHeight * rows;
      final float colWidth = tableWidth/(float)cols;
      final float cellMargin=5f;  

      // draw the rows
      float nexty = y ;
      for (int i = 0; i <= rows; i++) {   
         contentStream.drawLine(margin,nexty,margin+tableWidth,nexty);
         nexty-= rowHeight;
      }  

      //draw the columns
      float nextx = margin;
      for (int i = 0; i <= cols; i++) {
         contentStream.drawLine(nextx,y,nextx,y-tableHeight);
         nextx += colWidth;
      }  

      // now add the text    
      contentStream.setFont(PDType1Font.HELVETICA_BOLD,12);  

      float textx = margin+cellMargin;
      float texty = y-15;
      for(int i = 0; i < content.length; i++){
         for(int j = 0 ; j < content[i].length; j++){
            String text = content[i][j];
            contentStream.beginText();
            contentStream.moveTextPositionByAmount(textx,texty);
            contentStream.drawString(text);
            contentStream.endText();
            textx += colWidth;
         }

         texty-=rowHeight;
         textx = margin+cellMargin;
      }
   }  

   @Override
   public Tutorial process(Tutorial item) throws Exception {
      System.out.println("Processing..." + item);

      // Creating PDF document object
      PDDocument doc = PDDocument.load(new File("C:/Examples/test.pdf"));     

      // Creating a blank page
      PDPage page = new PDPage();
      doc.addPage( page );
      PDPageContentStream contentStream =  new PDPageContentStream(doc, page);  

      String[][] content = {{"Id",""+item.getTutorial_id()},
      {"Title", item.getTutorial_title()},
      {"Authour", item.getTutorial_author()},
      {"Submission Date", item.getSubmission_date()}} ;  
      drawTable(page, contentStream, 700, 100, content);       

      contentStream.close();
      doc.save("C:/Examples/test.pdf" );
      System.out.println("Hello");
      return item;
   }    
}

TutorialFieldSetMapper.java

以下是ReportFieldSetMapper类,它将数据设置为Tutorial类。

import org.springframework.batch.item.file.mapping.FieldSetMapper;
import org.springframework.batch.item.file.transform.FieldSet;
import org.springframework.validation.BindException;  

public class TutorialFieldSetMapper implements FieldSetMapper<Tutorial> {

   @Override
   public Tutorial mapFieldSet(FieldSet fieldSet) throws BindException {   
      // instantiating the Tutorial class
      Tutorial tutorial = new Tutorial();

      // Setting the fields from XML
      tutorial.setTutorial_id(fieldSet.readInt(0));   
      tutorial.setTutorial_title(fieldSet.readString(1));
      tutorial.setTutorial_author(fieldSet.readString(2));
      tutorial.setTutorial_icon(fieldSet.readString(3));
      tutorial.setTutorial_description(fieldSet.readString(4));   
      return tutorial;  
   }  
}

Tutorial.java

以下是 Tutorial 类。这是一个带有 settergetter 方法的简单类。

public class Tutorial {
   private int tutorial_id;
   private String tutorial_author;
   private String tutorial_title;
   private String submission_date;
   private String tutorial_icon;
   private String tutorial_description;   

   @Override
   public String toString() {
      return " [id=" + tutorial_id + ", author=" + tutorial_author  
         + ", title=" + tutorial_title + ", date=" + submission_date + ", icon ="
         +tutorial_icon +", description = "+tutorial_description+"]";
   }  

   public int getTutorial_id() {
      return tutorial_id;
   }  

   public void setTutorial_id(int tutorial_id) {
      this.tutorial_id = tutorial_id;
   }  

   public String getTutorial_author() {
      return tutorial_author;
   }  

   public void setTutorial_author(String tutorial_author) {
      this.tutorial_author = tutorial_author;
   }  

   public String getTutorial_title() {
      return tutorial_title;
   }

   public void setTutorial_title(String tutorial_title) {
      this.tutorial_title = tutorial_title;
   }  

   public String getSubmission_date() {
      return submission_date;
   }  

   public void setSubmission_date(String submission_date) {
      this.submission_date = submission_date;
   }  

   public String getTutorial_icon() {
      return tutorial_icon;
   }  

   public void setTutorial_icon(String tutorial_icon) {
      this.tutorial_icon = tutorial_icon;
   }  

   public String getTutorial_description() {
      return tutorial_description;
   }  

   public void setTutorial_description(String tutorial_description) {
      this.tutorial_description = tutorial_description;
   }
}

App.java

以下是启动批处理过程的代码。在本课程中,我们将通过运行JobLauncher启动批处理应用程序。

public class App {
   public static void main(String[] args) throws Exception {
      String[] springConfig  = {    "jobs/job_hello_world.xml" };  

      // Creating the application context object  
      ApplicationContext context = new ClassPathXmlApplicationContext(springConfig);  

      // Creating the job launcher
      JobLauncher jobLauncher = (JobLauncher) context.getBean("jobLauncher");

      // Creating the job
      Job job = (Job) context.getBean("helloWorldJob");

      // Executing the JOB
      JobExecution execution = jobLauncher.run(job, new JobParameters());
      System.out.println("Exit Status : " + execution.getStatus());
   }    
}

在执行此应用程序时,它将生成以下输出。

May 05, 2017 4:39:22 PM org.springframework.context.support.ClassPathXmlApplicationContext
prepareRefresh
INFO: Refreshing org.springframework.context.support.ClassPathXmlApplicationContext@306a30c7:
startup date [Fri May 05 16:39:22 IST 2017]; root of context hierarchy
May 05, 2017 4:39:23 PM org.springframework.beans.factory.xml.XmlBeanDefinitionReader loadBeanDefinitions
May 05, 2017 4:39:32 PM org.springframework.batch.core.job.SimpleStepHandler handleStep
INFO: Executing step: [step1]
**Processing**... [id=1001, author=Sanjay, title=Learn Java, date=06-05-2007,
icon =https://www.codingdict.com/java/images/java-mini-logo.jpg,
description = Java is a high-level programming language originally developed by Sun Microsystems
and released in 1995. Java runs on a variety of platforms.
This tutorial gives a complete understanding of Java.');]
Hello
**Processing**.. [id=1002, author=Abdul S, title=Learn MySQL, date=19-04-2007,
icon =https://www.codingdict.com/mysql/images/mysql-mini-logo.jpg,
description = MySQL is the most popular Open Source Relational SQL database management system.
MySQL is one of the best RDBMS being used for developing web-based software applications.
This tutorial will give you quick start with MySQL and make you comfortable with MySQL programming.]
Hello
**Processing**... [id=1003, author=Krishna Kasyap, title=Learn JavaFX, date=06-072017,
icon =https://www.codingdict.com/javafx/images/javafx-mini-logo.jpg,
description = JavaFX is a Java library used to build Rich Internet Applications.
The applications developed using JavaFX can run on various devices
such as Desktop Computers, Mobile Phones, TVs, Tablets, etc.
This tutorial, discusses all the necessary elements of JavaFX
that are required to develop effective Rich Internet Applications]
Hello
May 05, 2017 4:39:36 PM org.springframework.batch.core.launch.support.SimpleJobLauncher run
INFO: Job: [FlowJob: [name=helloWorldJob]] completed with the following parameters: [{}]
and the following status: [COMPLETED]
Exit Status : COMPLETED

如果验证数据库中的 details.tutorial 表,它将显示以下输出

tutorial _id tutorial _author tutorial _title submission _date tutorial _icon tutorial _description
1001 Sanjay Learn Java 06-05-2007 Java Icon Java是一种高级编程语言,最初由Sun Microsystems开发并于1995年发布.Java可在各种平台上运行。本教程提供了对Java的完整理解。
1002 Abdul S Learn MySQL 19-04-2007 MySQL Icon MySQL是最流行的开源关系SQL数据库管理系统。MySQL是用于开发基于Web的软件应用程序的最佳RDBMS之一。本教程将为您提供MySQL的快速入门,让您熟悉MySQL编程。
1003 Learn JavaFX Krishna Kasyap 06-07-2017 MySQL Icon MySQL是最流行的开源关系SQL数据库管理系统。MySQL是用于开发基于Web的软件应用程序的最佳RDBMS之一。本教程将为您提供MySQL的快速入门,让您熟悉MySQL编程。

这将生成一个PDF,其中包含每页上的记录,如下所示。

页面缩略图