使用JAVA將CSV轉換為XML
[英]Conversion of CSV to XML with JAVA
問題描述
我有一組CSV數據要轉換為XML。 代碼看起來不錯，但是輸出不夠完美。 它省略了一些列，因為它們沒有價值，並且產生了很長的XML數據行，而不是破壞它。
這是我的CSV數據的示例：
Name Age Sex
chi 23
kay 19 male
John male
而我的代碼：
public class XMLCreators {
// Protected Properties
protected DocumentBuilderFactory domFactory = null;
protected DocumentBuilder domBuilder = null;
public XMLCreators() {
try {
domFactory = DocumentBuilderFactory.newInstance();
domBuilder = domFactory.newDocumentBuilder();
} catch (FactoryConfigurationError exp) {
System.err.println(exp.toString());
} catch (ParserConfigurationException exp) {
System.err.println(exp.toString());
} catch (Exception exp) {
System.err.println(exp.toString());
}
}
public int convertFile(String csvFileName, String xmlFileName,
String delimiter) {
int rowsCount = -1;
try {
Document newDoc = domBuilder.newDocument();
// Root element
Element rootElement = newDoc.createElement("XMLCreators");
newDoc.appendChild(rootElement);
// Read csv file
BufferedReader csvReader;
csvReader = new BufferedReader(new FileReader(csvFileName));
int fieldCount = 0;
String[] csvFields = null;
StringTokenizer stringTokenizer = null;
// Assumes the first line in CSV file is column/field names
// The column names are used to name the elements in the XML file,
// avoid the use of Space or other characters not suitable for XML element
// naming
String curLine = csvReader.readLine();
if (curLine != null) {
// how about other form of csv files?
stringTokenizer = new StringTokenizer(curLine, delimiter);
fieldCount = stringTokenizer.countTokens();
if (fieldCount > 0) {
csvFields = new String[fieldCount];
int i = 0;
while (stringTokenizer.hasMoreElements())
csvFields[i++] = String.valueOf(stringTokenizer.nextElement());
}
}
// At this point the coulmns are known, now read data by lines
while ((curLine = csvReader.readLine()) != null) {
stringTokenizer = new StringTokenizer(curLine, delimiter);
fieldCount = stringTokenizer.countTokens();
if (fieldCount > 0) {
Element rowElement = newDoc.createElement("row");
int i = 0;
while (stringTokenizer.hasMoreElements()) {
try {
String curValue = String.valueOf(stringTokenizer.nextElement());
Element curElement = newDoc.createElement(csvFields[i++]);
curElement.appendChild(newDoc.createTextNode(curValue));
rowElement.appendChild(curElement);
} catch (Exception exp) {
}
}
rootElement.appendChild(rowElement);
rowsCount++;
}
}
csvReader.close();
// Save the document to the disk file
TransformerFactory tranFactory = TransformerFactory.newInstance();
Transformer aTransformer = tranFactory.newTransformer();
Source src = new DOMSource(newDoc);
Result result = new StreamResult(new File(xmlFileName));
aTransformer.transform(src, result);
rowsCount++;
// Output to console for testing
// Resultt result = new StreamResult(System.out);
} catch (IOException exp) {
System.err.println(exp.toString());
} catch (Exception exp) {
System.err.println(exp.toString());
}
return rowsCount;
// "XLM Document has been created" + rowsCount;
}
}
當對以上數據執行此代碼時，將產生：
<?xml version="1.0" encoding="UTF-8"?>
<XMLCreators>
<row>
<Name>chi</Name>
<Age>23</Age>
</row>
<row>
<Name>kay</Name>
<Age>19</Age>
<sex>male</sex>
</row>
<row>
<Name>john</Name>
<Age>male</Age>
</row>
</XMLCreators>
我本人以這種形式安排它，但是輸出結果很長。 產生的輸出應為：
<?xml version="1.0" encoding="UTF-8"?>
<XMLCreators>
<row>
<Name>chi</Name>
<Age>23</Age>
<sex></sex>
</row>
<row>
<Name>kay</Name>
<Age>19</Age>
<sex>male</sex>
</row>
<row>
<Name>john</Name>
<Age></Age>
<sex>male</sex>
</row>
</XMLCreators>
3 個解決方案
解決方案1
2 已采納 2012-08-25 08:06:23
我同意Kennet。
我只是添加了
aTransformer .setOutputProperty(OutputKeys.INDENT, "yes");
aTransformer .setOutputProperty(OutputKeys.METHOD, "xml");
aTransformer .setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
這在元素之間添加了新行，並允許縮進。
更新
首先，我們向您展示的文件不是CSV（逗號分隔值）文件，我將讓您擔心這個問題...
List<String> headers = new ArrayList<String>(5);
File file = new File("Names2.csv");
BufferedReader reader = null;
try {
DocumentBuilderFactory domFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder domBuilder = domFactory.newDocumentBuilder();
Document newDoc = domBuilder.newDocument();
// Root element
Element rootElement = newDoc.createElement("XMLCreators");
newDoc.appendChild(rootElement);
reader = new BufferedReader(new FileReader(file));
int line = 0;
String text = null;
while ((text = reader.readLine()) != null) {
StringTokenizer st = new StringTokenizer(text, " ", false);
String[] rowValues = new String[st.countTokens()];
int index = 0;
while (st.hasMoreTokens()) {
String next = st.nextToken();
rowValues[index++] = next;
}
//String[] rowValues = text.split(",");
if (line == 0) { // Header row
for (String col : rowValues) {
headers.add(col);
}
} else { // Data row
Element rowElement = newDoc.createElement("row");
rootElement.appendChild(rowElement);
for (int col = 0; col < headers.size(); col++) {
String header = headers.get(col);
String value = null;
if (col < rowValues.length) {
value = rowValues[col];
} else {
// ?? Default value
value = "";
}
Element curElement = newDoc.createElement(header);
curElement.appendChild(newDoc.createTextNode(value));
rowElement.appendChild(curElement);
}
}
line++;
}
ByteArrayOutputStream baos = null;
OutputStreamWriter osw = null;
try {
baos = new ByteArrayOutputStream();
osw = new OutputStreamWriter(baos);
TransformerFactory tranFactory = TransformerFactory.newInstance();
Transformer aTransformer = tranFactory.newTransformer();
aTransformer.setOutputProperty(OutputKeys.INDENT, "yes");
aTransformer.setOutputProperty(OutputKeys.METHOD, "xml");
aTransformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
Source src = new DOMSource(newDoc);
Result result = new StreamResult(osw);
aTransformer.transform(src, result);
osw.flush();
System.out.println(new String(baos.toByteArray()));
} catch (Exception exp) {
exp.printStackTrace();
} finally {
try {
osw.close();
} catch (Exception e) {
}
try {
baos.close();
} catch (Exception e) {
}
}
} catch (Exception e) {
e.printStackTrace();
}
現在，我在這里使用List而不是Map 。 您需要確定如何最好地解決缺失值問題。 如果不事先知道文件的結構，這將不是一個簡單的解決方案。
無論如何，我最終會
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<XMLCreators>
<row>
<Name>chi</Name>
<Age>23</Age>
<Sex/>
</row>
<row>
<Name>kay</Name>
<Age>19</Age>
<Sex>male</Sex>
</row>
<row>
<Name>John</Name>
<Age>male</Age>
<Sex/>
</row>
</XMLCreators>
更新合並
public class XMLCreators {
// Protected Properties
protected DocumentBuilderFactory domFactory = null;
protected DocumentBuilder domBuilder = null;
public XMLCreators() {
try {
domFactory = DocumentBuilderFactory.newInstance();
domBuilder = domFactory.newDocumentBuilder();
} catch (FactoryConfigurationError exp) {
System.err.println(exp.toString());
} catch (ParserConfigurationException exp) {
System.err.println(exp.toString());
} catch (Exception exp) {
System.err.println(exp.toString());
}
}
public int convertFile(String csvFileName, String xmlFileName,
String delimiter) {
int rowsCount = -1;
try {
Document newDoc = domBuilder.newDocument();
// Root element
Element rootElement = newDoc.createElement("XMLCreators");
newDoc.appendChild(rootElement);
// Read csv file
BufferedReader csvReader;
csvReader = new BufferedReader(new FileReader(csvFileName));
// int fieldCount = 0;
// String[] csvFields = null;
// StringTokenizer stringTokenizer = null;
//
// // Assumes the first line in CSV file is column/field names
// // The column names are used to name the elements in the XML file,
// // avoid the use of Space or other characters not suitable for XML element
// // naming
//
// String curLine = csvReader.readLine();
// if (curLine != null) {
// // how about other form of csv files?
// stringTokenizer = new StringTokenizer(curLine, delimiter);
// fieldCount = stringTokenizer.countTokens();
// if (fieldCount > 0) {
// csvFields = new String[fieldCount];
// int i = 0;
// while (stringTokenizer.hasMoreElements()) {
// csvFields[i++] = String.valueOf(stringTokenizer.nextElement());
// }
// }
// }
//
// // At this point the coulmns are known, now read data by lines
// while ((curLine = csvReader.readLine()) != null) {
// stringTokenizer = new StringTokenizer(curLine, delimiter);
// fieldCount = stringTokenizer.countTokens();
// if (fieldCount > 0) {
// Element rowElement = newDoc.createElement("row");
// int i = 0;
// while (stringTokenizer.hasMoreElements()) {
// try {
// String curValue = String.valueOf(stringTokenizer.nextElement());
// Element curElement = newDoc.createElement(csvFields[i++]);
// curElement.appendChild(newDoc.createTextNode(curValue));
// rowElement.appendChild(curElement);
// } catch (Exception exp) {
// }
// }
// rootElement.appendChild(rowElement);
// rowsCount++;
// }
// }
// csvReader.close();
//
// // Save the document to the disk file
// TransformerFactory tranFactory = TransformerFactory.newInstance();
// Transformer aTransformer = tranFactory.newTransformer();
// Source src = new DOMSource(newDoc);
// Result result = new StreamResult(new File(xmlFileName));
// aTransformer.transform(src, result);
// rowsCount++;
int line = 0;
List<String> headers = new ArrayList<String>(5);
String text = null;
while ((text = csvReader.readLine()) != null) {
StringTokenizer st = new StringTokenizer(text, delimiter, false);
String[] rowValues = new String[st.countTokens()];
int index = 0;
while (st.hasMoreTokens()) {
String next = st.nextToken();
rowValues[index++] = next;
}
if (line == 0) { // Header row
for (String col : rowValues) {
headers.add(col);
}
} else { // Data row
rowsCount++;
Element rowElement = newDoc.createElement("row");
rootElement.appendChild(rowElement);
for (int col = 0; col < headers.size(); col++) {
String header = headers.get(col);
String value = null;
if (col < rowValues.length) {
value = rowValues[col];
} else {
// ?? Default value
value = "";
}
Element curElement = newDoc.createElement(header);
curElement.appendChild(newDoc.createTextNode(value));
rowElement.appendChild(curElement);
}
}
line++;
}
ByteArrayOutputStream baos = null;
OutputStreamWriter osw = null;
try {
baos = new ByteArrayOutputStream();
osw = new OutputStreamWriter(baos);
TransformerFactory tranFactory = TransformerFactory.newInstance();
Transformer aTransformer = tranFactory.newTransformer();
aTransformer.setOutputProperty(OutputKeys.INDENT, "yes");
aTransformer.setOutputProperty(OutputKeys.METHOD, "xml");
aTransformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
Source src = new DOMSource(newDoc);
Result result = new StreamResult(osw);
aTransformer.transform(src, result);
osw.flush();
System.out.println(new String(baos.toByteArray()));
} catch (Exception exp) {
exp.printStackTrace();
} finally {
try {
osw.close();
} catch (Exception e) {
}
try {
baos.close();
} catch (Exception e) {
}
}
// Output to console for testing
// Resultt result = new StreamResult(System.out);
} catch (IOException exp) {
System.err.println(exp.toString());
} catch (Exception exp) {
System.err.println(exp.toString());
}
return rowsCount;
// "XLM Document has been created" + rowsCount;
}
}
使用OpenCSV更新
public class XMLCreators {
// Protected Properties
protected DocumentBuilderFactory domFactory = null;
protected DocumentBuilder domBuilder = null;
public XMLCreators() {
try {
domFactory = DocumentBuilderFactory.newInstance();
domBuilder = domFactory.newDocumentBuilder();
} catch (FactoryConfigurationError exp) {
System.err.println(exp.toString());
} catch (ParserConfigurationException exp) {
System.err.println(exp.toString());
} catch (Exception exp) {
System.err.println(exp.toString());
}
}
public int convertFile(String csvFileName, String xmlFileName,
String delimiter) {
int rowsCount = -1;
BufferedReader csvReader;
try {
Document newDoc = domBuilder.newDocument();
// Root element
Element rootElement = newDoc.createElement("XMLCreators");
newDoc.appendChild(rootElement);
// Read csv file
csvReader = new BufferedReader(new FileReader(csvFileName));
//** Now using the OpenCSV **//
CSVReader reader = new CSVReader(new FileReader("names.csv"), delimiter.charAt(0));
//CSVReader reader = new CSVReader(csvReader);
String[] nextLine;
int line = 0;
List<String> headers = new ArrayList<String>(5);
while ((nextLine = reader.readNext()) != null) {
if (line == 0) { // Header row
for (String col : nextLine) {
headers.add(col);
}
} else { // Data row
Element rowElement = newDoc.createElement("row");
rootElement.appendChild(rowElement);
int col = 0;
for (String value : nextLine) {
String header = headers.get(col);
Element curElement = newDoc.createElement(header);
curElement.appendChild(newDoc.createTextNode(value.trim()));
rowElement.appendChild(curElement);
col++;
}
}
line++;
}
//** End of CSV parsing**//
FileWriter writer = null;
try {
writer = new FileWriter(new File(xmlFileName));
TransformerFactory tranFactory = TransformerFactory.newInstance();
Transformer aTransformer = tranFactory.newTransformer();
aTransformer.setOutputProperty(OutputKeys.INDENT, "yes");
aTransformer.setOutputProperty(OutputKeys.METHOD, "xml");
aTransformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
Source src = new DOMSource(newDoc);
Result result = new StreamResult(writer);
aTransformer.transform(src, result);
writer.flush();
} catch (Exception exp) {
exp.printStackTrace();
} finally {
try {
writer.close();
} catch (Exception e) {
}
}
// Output to console for testing
// Resultt result = new StreamResult(System.out);
} catch (IOException exp) {
System.err.println(exp.toString());
} catch (Exception exp) {
System.err.println(exp.toString());
}
return rowsCount;
// "XLM Document has been created" + rowsCount;
}
}
解決方案2
0 2018-02-21 12:31:41
public int convertFile(String csvFileName, String xmlFileName, String delimiter) {
int rowsCount = -1;
try {
Document newDoc = domBuilder.newDocument();
// Root element
Element rootElement = newDoc.createElement("XMLCreators");
newDoc.appendChild(rootElement);
// Read csv file
BufferedReader csvReader;
csvReader = new BufferedReader(new FileReader(csvFileName));
int fieldCount = 0;
String[] csvFields = null;
String[] csvValues = null;
// Assumes the first line in CSV file is column/field names
// The column names are used to name the elements in the XML file,
// avoid the use of Space or other characters not suitable for XML element
// naming
String curLine = csvReader.readLine();
if (curLine != null) {
csvFields=curLine.split(",", -1);
}
// At this point the coulmns are known, now read data by lines
int i =0;
while ((curLine = csvReader.readLine()) != null) {
csvValues=curLine.split(",", -1);
Element rowElement = newDoc.createElement("record-"+i);
try {
for(fieldCount=0;fieldCount<csvValues.length;fieldCount++)
{
String curValue = csvValues[fieldCount];
Element curElement = newDoc.createElement(csvFields[fieldCount]);
curElement.appendChild(newDoc.createTextNode(curValue));
rowElement.appendChild(curElement);
}
} catch (Exception exp) {
}
rootElement.appendChild(rowElement);
i++;
}
解決方案3
0 2019-08-29 17:10:29
package org.mycompany.conversion;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import org.apache.camel.dataformat.bindy.annotation.CsvRecord;
import org.apache.camel.dataformat.bindy.annotation.DataField;
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
@CsvRecord(separator = ",")
public class Person {
@DataField(pos = 1)
@XmlElement
private int id;
@DataField(pos = 2)
@XmlElement
private String name;
@DataField(pos = 3)
@XmlElement
private int age;
@Override
public String toString() {
return "Person [id=" + id + ", name=" + name + ", age=" + age + "]";
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
=========================================================================================package org.mycompany.conversion;
import java.util.List;
import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class Greeting {
@XmlElementWrapper(name = "Person")
@XmlElement(name = "persons")
private List<Person> persons;
public List<Person> getPerson() {
return persons;
}
public void setPerson(List<Person> persons) {
this.persons = persons;
}
}
=========================================================================================
package org.mycompany.conversion;
import javax.xml.bind.JAXBContext;
import org.apache.camel.CamelContext;
import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.converter.jaxb.JaxbDataFormat;
import org.apache.camel.dataformat.bindy.csv.BindyCsvDataFormat;
import org.apache.camel.impl.DefaultCamelContext;
import org.apache.camel.spi.DataFormat;
public class CsvConversion {
public static void main(String[] args) throws Exception {
JaxbDataFormat xmlDataFormat = new JaxbDataFormat();
JAXBContext con = JAXBContext.newInstance(Greeting.class);
xmlDataFormat.setContext(con);
DataFormat bindy = new BindyCsvDataFormat(Person.class);
CamelContext context = new DefaultCamelContext();
context.addRoutes(new RouteBuilder() {
@Override
public void configure() throws Exception {
from("file:src/main/data/in/csv?noop=true").split().tokenize("\n").unmarshal(bindy)
// constanr(true):-aggregate all using same expression
.aggregate(constant(true), new AttachAggregation())
//mandatory after aggregate
.completionTimeout(100)//end after this gives problem
.marshal(xmlDataFormat).log("xml body is ${body}")
.to("file:src/main/data/in/xml?fileName=convertedXml.xml");// .aggregate(new
// AttachAggreagation());
}
});
context.start();
Thread.sleep(5000);
}
}
===================================================================================
package org.mycompany.conversion;
import java.util.ArrayList;
import java.util.List;
import org.apache.camel.Exchange;
import org.apache.camel.processor.aggregate.AggregationStrategy;
public class AttachAggregation implements AggregationStrategy {
List<Person> list = new ArrayList();
Greeting gre = new Greeting();
@Override
//person-address
// greeting-user
public Exchange aggregate(Exchange oldExchange, Exchange newExchange) {
if (oldExchange == null) {
Person newBody1 = newExchange.getIn().getBody(Person.class);
list.add(newBody1);
return newExchange;
} else {
Person newBody2 = newExchange.getIn().getBody(Person.class);
list.add(newBody2);
gre.setPerson(list);
oldExchange.getIn().setBody(gre);
return oldExchange;
}
}
}
XML到CSV轉換Java
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