Convert Java object to XML string

Question

Yes  yes I know that lots of questions were asked about this topic  But I still cannot find the solution to my problem  I have a property annotated Java object  For example Customer  like in this example  And I want a String representation of it  Google reccomends using JAXB for such purposes  But in all examples created XML file is printed to file or console  like this   File file   new File  C   file xml    JAXBContext jaxbContext   JAXBContext newInstance Customer class   Marshaller jaxbMarshaller   jaxbContext createMarshaller        output pretty printed jaxbMarshaller setProperty Marshaller JAXB FORMATTED OUTPUT  true    jaxbMarshaller marshal customer  file   jaxbMarshaller marshal customer  System out     But I have to use this object and send over network in XML format  So I want to get a String which represents XML   String xmlString       sendOverNetwork xmlString     How can I do this

User · Answer

Using ByteArrayOutputStream  public static String printObjectToXML final Object object  throws TransformerFactoryConfigurationError          TransformerConfigurationException  SOAPException  TransformerException       ByteArrayOutputStream baos   new ByteArrayOutputStream        XMLEncoder xmlEncoder   new XMLEncoder baos       xmlEncoder writeObject object       xmlEncoder close         String xml   baos toString        System out println xml        return xml toString

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Some Generic code to create XML Stirng  object --   is Java class to convert it to XML name --   is just name space like thing - for differentiate  public static String convertObjectToXML Object object String name              try                 StringWriter stringWriter   new StringWriter                  JAXBContext jaxbContext   JAXBContext newInstance object getClass                   Marshaller jaxbMarshaller   jaxbContext createMarshaller                  jaxbMarshaller setProperty Marshaller JAXB FORMATTED OUTPUT  true                 QName qName   new QName object getClass   toString    name                 Object root   new JAXBElement lt Object gt  qName java lang Object class  object                 jaxbMarshaller marshal root  stringWriter                 String result   stringWriter toString                  System out println result                 return result           catch  Exception e                e printStackTrace                      return null

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You can use the Marshaler s method for marshaling which takes a Writer as parameter      marshal Object Writer    and pass it an Implementation which can build a String object     Direct Known Subclasses    BufferedWriter  CharArrayWriter  FilterWriter  OutputStreamWriter  PipedWriter  PrintWriter  StringWriter    Call its toString method to get the actual String value   So doing   StringWriter sw   new StringWriter    jaxbMarshaller marshal customer  sw   String xmlString   sw toString

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A convenient option is to use javax xml bind JAXB  StringWriter sw   new StringWriter    JAXB marshal customer  sw   String xmlString   sw toString     The  reverse  process  unmarshal  would be  Customer customer   JAXB unmarshal new StringReader xmlString   Customer class    No need to deal with checked exceptions in this approach

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Testing And working Java code to convert java object to XML   Customer java  import java util ArrayList   import javax xml bind annotation XmlAttribute  import javax xml bind annotation XmlElement  import javax xml bind annotation XmlRootElement     XmlRootElement public class Customer        String name      int age      int id      String desc      ArrayList lt String gt  list       public ArrayList lt String gt  getList                 return list              XmlElement     public void setList ArrayList lt String gt  list                this list   list             public String getDesc                 return desc              XmlElement     public void setDesc String desc                this desc   desc             public String getName             return name              XmlElement     public void setName String name            this name   name             public int getAge             return age              XmlElement     public void setAge int age            this age   age             public int getId             return id              XmlAttribute     public void setId int id            this id   id            createXML java  import java io StringWriter  import java util ArrayList   import javax xml bind JAXBContext  import javax xml bind Marshaller    public class createXML        public static void main String args    throws Exception               ArrayList lt String gt  list   new ArrayList lt String gt             list add  1            list add  2            list add  3            list add  4            Customer c   new Customer            c setAge 45           c setDesc  some desc             c setId 23           c setList list           c setName  name            JAXBContext jaxbContext   JAXBContext newInstance Customer class           Marshaller jaxbMarshaller   jaxbContext createMarshaller            jaxbMarshaller setProperty Marshaller JAXB FORMATTED OUTPUT  true           StringWriter sw   new StringWriter            jaxbMarshaller marshal c  sw           String xmlString   sw toString            System out println xmlString

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As A4L mentioning  you can use StringWriter  Providing here example code   private static String jaxbObjectToXML Customer customer        String xmlString           try           JAXBContext context   JAXBContext newInstance Customer class           Marshaller m   context createMarshaller             m setProperty Marshaller JAXB FORMATTED OUTPUT  Boolean TRUE      To format XML          StringWriter sw   new StringWriter            m marshal customer  sw           xmlString   sw toString           catch  JAXBException e            e printStackTrace               return xmlString

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Here is a util class for marshaling and unmarshaling objects  In my case it was a nested class  so I made it static JAXBUtils    import javax xml bind JAXB  import java io StringReader  import java io StringWriter   public class JAXBUtils                  Unmarshal an XML string         param xml     The XML string         param type    The JAXB class type          return The unmarshalled object              public  lt T gt  T unmarshal String xml  Class lt T gt  type                StringReader reader   new StringReader xml           return javax xml bind JAXB unmarshal reader  type                         Marshal an Object to XML          param object    The object to marshal          return The XML string representation of the object              public String marshal Object object                StringWriter stringWriter   new StringWriter            JAXB marshal object  stringWriter           return stringWriter toString

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Underscore-java can construct XML string with help of a builder      class Customer           String name          int age          int id            Customer customer   new Customer        customer name    quot John quot       customer age   30      customer id   12345       String xml   U objectBuilder   add  quot customer quot   U objectBuilder            add  quot name quot   customer name           add  quot age quot   customer age           add  quot id quot   customer id   toXml             lt  xml version  quot 1 0 quot  encoding  quot UTF-8 quot   gt             lt customer gt               lt name gt John lt  name gt               lt age number  quot true quot  gt 30 lt  age gt               lt id number  quot true quot  gt 12345 lt  id gt             lt  customer gt

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import javax xml bind JAXBContext  import javax xml bind JAXBException  import javax xml bind Marshaller   private String generateXml Object obj  Class objClass  throws JAXBException           JAXBContext jaxbContext   JAXBContext newInstance objClass           Marshaller jaxbMarshaller   jaxbContext createMarshaller            jaxbMarshaller setProperty Marshaller JAXB FORMATTED OUTPUT  true           StringWriter sw   new StringWriter            jaxbMarshaller marshal obj  sw           return sw toString

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I took the JAXB marshal implementation and added jaxb fragment true to remove the XML prolog  This method can handle objects even without the XmlRootElement annotation  This also throws the unchecked DataBindingException   public static String toXmlString Object o        try           Class lt   gt  clazz   o getClass            JAXBContext context   JAXBContext newInstance clazz           Marshaller marshaller   context createMarshaller            marshaller setProperty Marshaller JAXB FRAGMENT  true      remove xml prolog         marshaller setProperty Marshaller JAXB FORMATTED OUTPUT  true      formatted output          final QName name   new QName Introspector decapitalize clazz getSimpleName              JAXBElement jaxbElement   new JAXBElement name  clazz  o            StringWriter sw   new StringWriter            marshaller marshal jaxbElement  sw           return sw toString           catch  JAXBException e            throw new DataBindingException e             If the compiler warning bothers you  here s the templated  two parameter version   public static  lt T gt  String toXmlString T o  Class lt T gt  clazz        try           JAXBContext context   JAXBContext newInstance clazz           Marshaller marshaller   context createMarshaller            marshaller setProperty Marshaller JAXB FRAGMENT  true      remove xml prolog         marshaller setProperty Marshaller JAXB FORMATTED OUTPUT  true      formatted output          QName name   new QName Introspector decapitalize clazz getSimpleName              JAXBElement jaxbElement   new JAXBElement lt  gt  name  clazz  o            StringWriter sw   new StringWriter            marshaller marshal jaxbElement  sw           return sw toString           catch  JAXBException e            throw new DataBindingException e

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Use this function to convert Object  to xml string   should be called as convertToXml sourceObject  Object class    --   import javax xml bind JAXBContext  import javax xml bind JAXBElement  import javax xml bind JAXBException  import javax xml bind Marshaller  import javax xml bind Unmarshaller  import javax xml namespace QName   public static  lt T gt  String convertToXml T source  Class lt T gt  clazz  throws JAXBException       String result      StringWriter sw   new StringWriter        JAXBContext jaxbContext   JAXBContext newInstance clazz       Marshaller jaxbMarshaller   jaxbContext createMarshaller        jaxbMarshaller setProperty Marshaller JAXB FORMATTED OUTPUT  true       QName qName   new QName StringUtils uncapitalize clazz getSimpleName          JAXBElement lt T gt  root   new JAXBElement lt T gt  qName  clazz  source       jaxbMarshaller marshal root  sw       result   sw toString        return result      Use this function to convert xml string to Object back --   should be called as createObjectFromXmlString xmlString  Object class    public static  lt T gt  T createObjectFromXmlString String xml  Class lt T gt  clazz  throws JAXBException  IOException       T value   null      StringReader reader   new StringReader xml        JAXBContext jaxbContext   JAXBContext newInstance clazz       Unmarshaller jaxbUnmarshaller   jaxbContext createUnmarshaller        JAXBElement lt T gt  rootElement jaxbUnmarshaller unmarshal new StreamSource reader  clazz       value   rootElement getValue        return value

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To convert an Object to XML in Java  Customer java  package com   import java util ArrayList  import javax xml bind annotation XmlAttribute  import javax xml bind annotation XmlElement  import javax xml bind annotation XmlRootElement            author ABsiddik      XmlRootElement public class Customer    int id  String name  int age   String address  ArrayList lt String gt  mobileNo     public int getId         return id      XmlAttribute public void setId int id        this id   id     public String getName         return name      XmlElement public void setName String name        this name   name     public int getAge         return age      XmlElement public void setAge int age        this age   age     public String getAddress         return address      XmlElement public void setAddress String address        this address   address     public ArrayList lt String gt  getMobileNo         return mobileNo      XmlElement public void setMobileNo ArrayList lt String gt  mobileNo        this mobileNo   mobileNo          ConvertObjToXML java  package com   import java io File  import java io StringWriter  import java util ArrayList  import javax xml bind JAXBContext  import javax xml bind Marshaller            author ABsiddik    public class ConvertObjToXML    public static void main String args    throws Exception       ArrayList lt String gt  numberList   new ArrayList lt  gt         numberList add  01942652579        numberList add  01762752801        numberList add  8800545         Customer c   new Customer         c setId 23       c setName  Abu Bakar Siddik        c setAge 45       c setAddress  Dhaka  Bangladesh        c setMobileNo numberList        File file   new File  C   Users  NETIZEN-ONE  Desktop   customer xml        JAXBContext jaxbContext   JAXBContext newInstance Customer class       Marshaller jaxbMarshaller   jaxbContext createMarshaller        jaxbMarshaller setProperty Marshaller JAXB FORMATTED OUTPUT  true        jaxbMarshaller marshal c  file     this line create customer xml file in specified path       StringWriter sw   new StringWriter        jaxbMarshaller marshal c  sw       String xmlString   sw toString         System out println xmlString          Try with this example

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You can marshal it to a StringWriter and grab its string  from toString

[java] Convert Java object to XML string

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