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Java XML parser is used to work with xml data. XML is widely used technology to transport or store data. That’s why there are many java xml parsers available.
Some of the commonly used java xml parsers are;
There are some other APIs also available for XML parsing in java, for example JDOM
and JiBX
. This java xml parser tutorial is aimed to explore different kinds of XML processing API’s and to learn some common tasks we need to perform with XML such as read, write and edit.
DOM Parser is the easiest java xml parser to learn. DOM parser loads the XML file into memory and we can traverse it node by node to parse the XML. DOM Parser is good for small files but when file size increases it performs slow and consumes more memory.
Java SAX Parser provides API to parse XML documents. SAX Parsers are different than DOM parser because it doesn’t load complete XML into memory and read xml document sequentially. It’s an event based parser and we need to implement our Handler class with callback methods to parse XML file. It’s more efficient than DOM Parser for large XML files in terms of time and memory usage.
Java Streaming API for XML (Java StAX) provides implementation for processing XML in java. StAX consists of two sets of API – cursor based API and iterator based API. I have covered this java xml parser extensively in different posts.
XMLEventReader
).XMLEventWriter
).XMLStreamReader
) to read XML data to Object.XMLStreamWriter
object and write data into it. This tutorial explains it in detail with example.JDOM provides a great Java XML parser API to read, edit and write XML documents easily. JDOM provides wrapper classes to chose your underlying implementation from SAX Parser, DOM Parser, STAX Event Parser and STAX Stream Parser. Benefit of using JDOM is that you can switch from SAX to DOM to STAX Parser easily, you can provide factory methods to let client application chose the implementation.
XMLOutputter
class can be used to write the Document to any OutputStream
or Writer
object.Java Architecture for XML Binding (JAXB) provides API for converting Object to XML and XML to Object easily. JAXB was developed as a separate project but it was used widely and finally became part of JDK in Java 6.
Marshaller
to convert Object to XML. Unmarshaller
is used to convert XML to java Object. In this tutorial we will learn most widely used JAXB annotations and how to convert a Java Object to XML (Marshalling) and XML to Java Object (Unmarhsalling).JiBX is a very powerful framework for converting XML data to java object and vice versa. It is very useful in applications integration where XML is the format for data transfer, for example, Web Services and Legacy Systems Integration based on Message Oriented Model (MOM).
XPath provides syntax to define part of an XML document. XPath Expression is a query language to select part of the XML document based on the query String. Using XPath Expressions, we can find nodes in any xml document satisfying the query string.
javax.xml.validation.Validator
class is used in this tutorial to validate xml file against xsd file.I will be adding more java XML parser tutorials here as and when I post more, so don’t forget to bookmark it for future use.
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two excel package working.excell; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.util.ArrayList; import java.util.Iterator; import java.util.List; import org.apache.poi.ss.usermodel.Cell; import org.apache.poi.ss.usermodel.Row; import org.apache.poi.xssf.usermodel.XSSFCell; import org.apache.poi.xssf.usermodel.XSSFRow; import org.apache.poi.xssf.usermodel.XSSFSheet; import org.apache.poi.xssf.usermodel.XSSFWorkbook; //Compare two excel and write to one excel public class CompareArraylistExcel { static Boolean check = false; public static void main(String args[]) throws IOException { try { List excellist1 = new ArrayList(); List excellist2 = new ArrayList(); List excellist3 = new ArrayList(); FileInputStream file1 = new FileInputStream(new File( “al1.xlsx”)); FileInputStream file2 = new FileInputStream(new File( “al2.xlsx”)); // Get the workbook instance for XLS file XSSFWorkbook workbook1 = new XSSFWorkbook(file1); XSSFWorkbook workbook2 = new XSSFWorkbook(file2); // Get first sheet from the workbook XSSFSheet sheet1 = workbook1.getSheetAt(0); XSSFSheet sheet2 = workbook2.getSheetAt(0); // Compare sheets // Get iterator to all the rows in current sheet1 Iterator rowIterator1 = sheet1.iterator(); Iterator rowIterator2 = sheet2.iterator(); Employee emp;//=new Employee(); int j=0; while (rowIterator1.hasNext()) { Row row = rowIterator1.next(); // For each row, iterate through all the columns Iterator cellIterator = row.cellIterator(); emp = new Employee(); while (cellIterator.hasNext()) { Cell cell = cellIterator.next(); // This is for read only one column from excel for (int ii = 0; ii < 3; ii++) { if (cell.getColumnIndex() == ii) { // Check the cell type and format accordingly switch (cell.getCellType()) { case Cell.CELL_TYPE_NUMERIC: System.out.print(cell.getNumericCellValue()); if (ii == 1) emp.setAge(cell.getNumericCellValue()+“”); break; case Cell.CELL_TYPE_STRING: System.out.print(cell.getStringCellValue()); if (ii == 0) emp.setId(cell.getStringCellValue().trim()); if (ii == 2) emp.setName(cell.getStringCellValue()); if (ii == 1) emp.setAge(cell.getStringCellValue()); break; case Cell.CELL_TYPE_BOOLEAN: System.out.print(cell.getBooleanCellValue()); break; } } } } excellist1.add(emp); // System.out.println(“… “); } while (rowIterator2.hasNext()) { Row row = rowIterator2.next(); // For each row, iterate through all the columns Iterator cellIterator = row.cellIterator(); emp = new Employee(); while (cellIterator.hasNext()) { Cell cell = cellIterator.next(); // This is for read only one column from excel for (int ii = 0; ii < 2; ii++) { if (cell.getColumnIndex() == ii) { // Check the cell type and format accordingly switch (cell.getCellType()) { case Cell.CELL_TYPE_NUMERIC: System.out.print(cell.getNumericCellValue()); if (ii == 1) emp.setSalary(cell.getNumericCellValue()+””); break; case Cell.CELL_TYPE_STRING: System.out.print(cell.getStringCellValue()); if (ii == 0) emp.setId(cell.getStringCellValue().trim()); if (ii == 2) emp.setName(cell.getStringCellValue()); if (ii == 1) emp.setSalary(cell.getStringCellValue()); break; case Cell.CELL_TYPE_BOOLEAN: System.out.print(cell.getBooleanCellValue()); break; } } } } excellist2.add(emp); System.out.println(“… “+emp.getSalary()+”…”+emp.getId()); } System.out.println(“book1.xls – " + excellist1.size()); System.out.println(“book1.xls – " + excellist2.size()); writeStudentsListToExcel(excellist1,excellist2,excellist3); // closing the files file1.close(); file2.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } //compare two arraylist and write to one arraylist and write into new file excel private static void writeStudentsListToExcel(List excellist1,List excellist2,List excellist3) { FileOutputStream fos = null; try { fos = new FileOutputStream(“test4.xls”); // ArrayList missingNumbers = new ArrayList(); Employee list3emp; for (int x = 0; x < excellist1.size(); x++) { list3emp=new Employee(); Employee currentUser = (Employee) excellist1.get(x); for (int y = 0; y < excellist2.size(); y++) { Employee list2 = (Employee) excellist2.get(y); // System.out.println(” ids “+ list2.getId()+”…”+currentUser.getId()); if (currentUser.getId().equals(list2.getId())) { System.out.println(“ddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd”); list3emp.setId(currentUser.getId()); list3emp.setAge(currentUser.getAge()); list3emp.setName(currentUser.getName()); list3emp.setSalary(list2.getSalary()); System.out.println(" nnnnnnnn “+ list2.getSalary()); break; } } excellist3.add(list3emp); } System.out.println(“final.xls – " + excellist3.size()); for (int i = 0; i < excellist3.size(); i++) { System.out.println(excellist3.get(i).getId()+” “+excellist3.get(i).getSalary()); } XSSFWorkbook workBook = new XSSFWorkbook(); XSSFSheet spreadSheet = workBook.createSheet(“email”); XSSFRow row; XSSFCell cell0; XSSFCell cell1; XSSFCell cell2; XSSFCell cell3; // System.out.println(“array size is :: “+minusArray.size()); int cellnumber = 0; Employee emp; for (int i1 = 0; i1 < excellist3.size(); i1++) { Employee list3 = (Employee) excellist3.get(i1); row = spreadSheet.createRow(i1); cell0 = row.createCell(0); cell1 = row.createCell(1); cell2 = row.createCell(2); cell3 = row.createCell(3); // System.out.print(cell.getCellStyle()); cell0.setCellValue(list3.getName().toString().trim()); cell1.setCellValue(list3.getId().toString().trim()); cell2.setCellValue(list3.getAge()+””); cell3.setCellValue(list3.getSalary()+””); } workBook.write(fos); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } // end -write into new file } =============== 4.0.0 poi poi 0.0.1-SNAPSHOT org.apache.poi poi 3.15 org.apache.poi poi-ooxml 3.15 xmlunit xmlunit 1.6 test org.apache.xmlbeans xmlbeans 2.6.0 org.w3c dom 2.3.0-jaxb-1.0.6 org.apache.commons commons-collections4 4.1
- Sekar Karuppan
hello Pankaj i need new to store the data what i gat from the xml file in mysql database but without writing any query i think that there is always way to doit if you can help i will be very thinkful.
- hossam
I m learning XML with java Many Thanks for sharing this.
- Priya
Nice Tutorial Is java providing any API to generate XSD programmatically. I having below information using that i want to generate XSD. Root Tag = item | FieldName | FieldType | Xpath | | name | string | “/item” | | quantity | Integer | “/item” | | price | price | “/item” | | amount | Integer | “/item/price” | | currency | string | “/item/price” | My output XSD should look like as below
- shramik
Hi , valuable info sir … I need to read coordinates (x,y) from xml and show it in image form (graph) using java . Can you suggest me how?
- Rohit
I required object type SOAP parsing please provide me small information so i will do that.
- Sharda Prasad
I want to know abt Sax parser . Do you guys have any implementation for Saxb parser . Please upload it. thanks
- Rajan
it’s nice tutorial. actually i want to store all the mouse clicked coordinates in an xml file randomly. how to create the xml file randomly in java with xml?
- vinayakumar
I want to create xml file randomly and update it. How can I do it. It may helpful if you reply to mail. Thank you sir
- Snehasish
how to parse xml with dynamically generated list.
- jagadeesh