VO objects map XML files using groovy templates

Introduction

I have previously written a Java + XSLT-related technical blog and recently studied an open source toolkit org. codehaus. Groovy, which is very convenient for processing VO object and XML file ing. To put it simply, map the attributes (including collection and map) in the vo object to an XML file through the groovy template file.

Maven Pom. xml

<dependency><groupId>org.codehaus.groovy</groupId><artifactId>groovy-all</artifactId><version>2.3.0</version></dependency>

VO class:

package shuai.study.groovy.demo.vo;import java.util.LinkedHashMap;import java.util.Map;public class MeasurementVO {private String dn = null;private String measurementType = null;private Map<String, Integer> counterMap = new LinkedHashMap<String, Integer>();public String getDn() {return this.dn;}public void setDn(String dn) {this.dn = dn;}public String getMeasurementType() {return this.measurementType;}public void setMeasurementType(String measurementType) {this.measurementType = measurementType;}public Map<String, Integer> getCounterMap() {return this.counterMap;}public void setCounterMap(Map<String, Integer> counterMap) {this.counterMap = counterMap;}}

Collection class:

package shuai.study.groovy.demo.collection;import java.util.LinkedList;import java.util.List;import shuai.study.groovy.demo.vo.MeasurementVO;public class MeasurementCollection {List<MeasurementVO> MeasurementVoList = new LinkedList<MeasurementVO>();public List<MeasurementVO> getMeasurementVoList() {return this.MeasurementVoList;}public void setMeasurementVoList(MeasurementVO measurementVO) {this.MeasurementVoList.add(measurementVO);}}

Groovy template file:

<?xml version="1.0"?><OMeS><PMSetup><PMMOResult><% def measurementVoList=measurementCollection.getMeasurementVoList();for (measurementVo in measurementVoList) {def dn=measurementVo.getDn();def measurementType=measurementVo.getMeasurementType();%><MO><DN>${dn}</DN></MO><PMTarget measurementType="${measurementType}"><% def counterMap=measurementVo.getCounterMap();counterMap.each {def counterKey=it.key;def counterValue=it.value;%><${counterKey}>${counterValue}</${counterKey}><%}%></PMTarget><%}%></PMMOResult></PMSetup></OMeS>

Transfer class:

package shuai.study.groovy.demo.transfer;import groovy.text.SimpleTemplateEngine;import groovy.text.Template;import java.io.BufferedWriter;import java.io.File;import java.io.FileWriter;import java.io.IOException;import java.io.Writer;import java.util.HashMap;import java.util.Map;import org.apache.commons.io.IOUtils;import org.codehaus.groovy.control.CompilationFailedException;import shuai.study.groovy.demo.collection.MeasurementCollection;public class MeasurementTransfer {private static MeasurementTransfer measurementTransfer = null;private Template template = null;public static MeasurementTransfer getMeasurementTransfer() {if (measurementTransfer == null) {synchronized (MeasurementTransfer.class) {if (measurementTransfer == null) {measurementTransfer = new MeasurementTransfer();}}}return measurementTransfer;}private MeasurementTransfer() {File measurementTemplateFile = new File("/demo/groovy/template/measurementTemplate.xml");if (!measurementTemplateFile.exists()) {throw new NullPointerException("Measurement template file " + measurementTemplateFile + " is null");}try {template = new SimpleTemplateEngine().createTemplate(measurementTemplateFile);} catch (CompilationFailedException cfe) {cfe.printStackTrace();} catch (ClassNotFoundException cnfe) {cnfe.printStackTrace();} catch (IOException ioe) {ioe.printStackTrace();}}public void transfer(MeasurementCollection measurementCollection, File outputFile) {Map<String, MeasurementCollection> measurementCollectionMap = new HashMap<String, MeasurementCollection>();measurementCollectionMap.put("measurementCollection", measurementCollection);Writer writer = null;try {FileWriter fileWriter = new FileWriter(outputFile);BufferedWriter bufferedWriter = new BufferedWriter(fileWriter);writer = template.make(measurementCollectionMap).writeTo(bufferedWriter);} catch (IOException ioe) {ioe.printStackTrace();} finally {IOUtils.closeQuietly(writer);}}}

Executer startup class:

package shuai.study.groovy.demo;import java.io.File;import java.io.IOException;import java.util.LinkedHashMap;import java.util.Map;import org.apache.commons.io.FileUtils;import shuai.study.groovy.demo.collection.MeasurementCollection;import shuai.study.groovy.demo.transfer.MeasurementTransfer;import shuai.study.groovy.demo.vo.MeasurementVO;public class MeasurementExecuter {public static void main(String[] args) {Map<String, Integer> counterMap = new LinkedHashMap<String, Integer>();counterMap.put("nbrOfProvModify", 100);counterMap.put("nbrOfProvCreate", 300);counterMap.put("nbrOfProvDelete", 500);MeasurementVO measurementVO = new MeasurementVO();measurementVO.setDn("PLMN-PLMN/IPS-1/CNODE-2/STYP-3");measurementVO.setMeasurementType("PERFMGMT");measurementVO.setCounterMap(counterMap);MeasurementCollection measurementCollection = new MeasurementCollection();measurementCollection.setMeasurementVoList(measurementVO);File measurementOutputFile = new File("/demo/groovy/output/measurementOutput.xml");try {FileUtils.touch(measurementOutputFile);} catch (IOException ioe) {ioe.printStackTrace();}MeasurementTransfer measurementTransfer = MeasurementTransfer.getMeasurementTransfer();measurementTransfer.transfer(measurementCollection, measurementOutputFile);}}

Output:

<?xml version="1.0"?><OMeS><PMSetup><PMMOResult><MO><DN>PLMN-PLMN/IPS-1/CNODE-2/STYP-3</DN></MO><PMTarget measurementType="PERFMGMT"><nbrOfProvModify>100</nbrOfProvModify><nbrOfProvCreate>300</nbrOfProvCreate><nbrOfProvDelete>500</nbrOfProvDelete></PMTarget></PMMOResult></PMSetup></OMeS>