How to read XML response from a URL in java

Question

I need to write a simple function that takes a URL and processes the response which is XML or JSON  I have checked the Sun website https   swingx-ws dev java net servlets ProjectDocumentList   but the HttpRequest object is to be found nowhere  is it possible to do this in Java  I m writting  a rich client end app

User · Answer

I found that the above answer caused me an exception when I tried to instantiate the parser   I found the following code that resolved this at http   docstore mik ua orelly xml sax2 ch03 02 htm   import org xml sax    import javax xml parsers     XMLReader        parser   try       SAXParserFactory factory       factory   SAXParserFactory newInstance         factory setNamespaceAware  true       parser   factory newSAXParser    getXMLReader            success     catch  FactoryConfigurationError err        System err println   can t create JAXP SAXParserFactory          err getMessage        catch  ParserConfigurationException err        System err println   can t create XMLReader with namespaces          err getMessage        catch  SAXException err        System err println   Hmm  SAXException      err getMessage

User · Answer

do it with the following code               DocumentBuilderFactory builderFactory   DocumentBuilderFactory newInstance         try           DocumentBuilder builder   builderFactory newDocumentBuilder            Document doc   builder parse   home codefelix IdeaProjects Gradle src main resources static Employees xml            NodeList namelist    NodeList  doc getElementById  1             for  int i   0  i  lt  namelist getLength    i                  Node p   namelist item i                if  p getNodeType      Node ELEMENT NODE                    Element person    Element  p                  NodeList id    NodeList  person getElementsByTagName  Employee                    NodeList nodeList   person getChildNodes                    List lt EmployeeDto gt  employeeDtoList new ArrayList                     for  int j   0  j  lt  nodeList getLength    j                          Node n   nodeList item j                        if  n getNodeType      Node ELEMENT NODE                            Element naame    Element  n                          System out println  Employee    id         naame getTagName          naame getTextContent                                                                           catch  ParserConfigurationException e            e printStackTrace          catch  SAXException e            e printStackTrace          catch  IOException e            e printStackTrace

User · Answer

If you specifically want to use SwingX-WS  then have a look at XmlHttpRequest and JSONHttpRequest    More on those classes in the XMLHttpRequest and Swing blog post

User · Answer

If you want to print XML directly onto the screen you can use TransformerFactory   URL url   new URL urlString   URLConnection conn   url openConnection     DocumentBuilderFactory factory   DocumentBuilderFactory newInstance    DocumentBuilder builder   factory newDocumentBuilder    Document doc   builder parse conn getInputStream      TransformerFactory transformerFactory  TransformerFactory newInstance    Transformer xform   transformerFactory newTransformer        that   s the default xform  use a stylesheet to get a real one xform transform new DOMSource doc   new StreamResult System out

User · Answer

This Code is to parse the XML wraps the  JSON Response and display in the front end using ajax     x000D   x000D  Required JavaScript code  x000D   lt script type  text javascript  gt  x000D    ajax   x000D   method  GET   x000D   url   javatpoint html    x000D    x000D   success   function data     x000D     x000D     var json JSON parse data    x000D     var tbody    tbody    x000D    for var i in json   x000D     tbody append   lt tr gt  lt td gt   json i  id   lt  td gt    x000D         lt td gt   json i  firstName   lt  td gt    x000D         lt td gt   json i  lastName   lt  td gt    x000D         lt td gt   json i  Download DateTime   lt  td gt    x000D         lt td gt   json i  photo   lt  td gt  lt  tr gt    x000D        x000D      x000D   error   function      x000D    alert  errorrrrr    x000D     x000D        x000D     x000D     lt  script gt  x000D   x000D   x000D                         id    1                    firstName    Tom                    lastName    Cruise                    photo    https   pbs twimg com profile images 735509975649378305 B81JwLT7 jpg                                                id    2                    firstName    Maria                    lastName    Sharapova                    photo    https   pbs twimg com profile images 3424509849 bfa1b9121afc39d1dcdb53cfc423bf12 jpeg                                                id    3                    firstName    James                    lastName    Bond                    photo    https   pbs twimg com profile images 664886718559076352 M00cOLrh jpg                    URL url new URL  www example com              URLConnection si url openConnection            InputStream is si getInputStream            String str             int i          while  i is read     -1                 str   str valueOf  char i                          str  str replace   lt  string gt                 str str replace   lt  xml version   1 0   encoding   utf-8    gt                 str   str replace   lt string xmlns   http   tempuri org    gt                 PrintWriter out resp getWriter            out println str

User · Answer

For xml parsing of an inputstream you can do      the SAX way  XMLReader myReader   XMLReaderFactory createXMLReader    myReader setContentHandler handler   myReader parse new InputSource new URL url  openStream          or if you prefer DOM  DocumentBuilderFactory dbf   DocumentBuilderFactory newInstance    DocumentBuilder db   dbf newDocumentBuilder    Document doc   db parse new URL url  openStream       But to communicate over http from server to client I prefer using hessian library or springs http invoker lib

User · Answer

Ok I think I have solves the problem below is a working code     package xmlhttp   import org jdesktop http Response   import org jdesktop http Session   import org jdesktop http State     public class GetXmlHttp        public static void main String   args             getResponse                public static void getResponse                  final Session session   new Session             try               String url  http   192 172 2 23 8080 geoserver wfs request GetFeature amp version 1 1 0 amp outputFormat GML2 amp typeName topp networkcoverage topp tehsil amp bbox 73 07846689124875 33 67929015631999 73 07946689124876 33 68029015632 EPSG 4326               final Response res session get url               boolean notDone true              do                               System out print session getState   toString                      if session getState    State DONE                                        String xml res toString                        System out println xml                       notDone false                                    while notDone              catch  Exception e1                 e1 printStackTrace

User · Answer

Get your response via a regular http-request  using    Apache HttpComponents the built-in URLConnection con   new URL  http   example com   openConnection      The next step is parsing it  Take a look at this article for a choice of parser

[java] How to read XML response from a URL in java?

Examples related to java

Examples related to xml

Examples related to httprequest