The corresponding JavaBean object collection is obtained by using reflection and dom4j read JavaBean to generate corresponding XML and read XML.

Transferred from: http://blog.csdn.net/zhao19861029/article/details/8473245

First implement the XML file method that generates the corresponding JavaBean

/*** dmo4j Write XML *@paramobj Generic Object *@paramEntitypropertys list collection of generic objects *@paramEncode XML custom encoding type (recommended with GBK) *@paramxmlpathandname the path and file name of the XML file*/       Public voidWritexmldocument (T obj, list<t>Entitypropertys, String Encode, String xmlpathandname) {           Longlasting = System.currenttimemillis ();//Efficiency Testing          Try{XMLWriter writer=NULL;//declaring an object that writes XMLOutputFormat format =Outputformat.createprettyprint (); Format.setencoding (Encode);//to set the encoding format for an XML fileString FilePath= Xmlpathandname;//get the file addressFile File =NewFile (FilePath);//Get Files              if(File.exists ()) {file.delete (); }               //Create a new Student.xml file and add new contentDocument document =documenthelper.createdocument (); String Rootname= Obj.getclass (). Getsimplename ();//Get class nameElement root = document.addelement (Rootname + "s");//Add root nodeField[] Properties = Obj.getclass (). Getdeclaredfields ();//get all properties of an entity class                         for(T T:entitypropertys) {//Recursive entitiesElement secondroot = root.addelement (rootname);//Level Two node                                 for(inti = 0; i < properties.length; i++) {                                          //Reflection Get MethodMethod meth =T.getclass (). GetMethod ("Get" + properties[i].getname (). substring (0, 1). toUpperCase ()+ properties[i].getname (). SUBSTRING (1)); //add an attribute to a level two node with the value of the corresponding propertysecondroot.addelement (Properties[i].getname ()). SetText (Meth.invoke (                     T). toString ()); }               }               //generating an XML filewriter =NewXMLWriter (NewFileWriter (file), format);               Writer.write (document);               Writer.close (); LongLasting2 =System.currenttimemillis (); System.out.println ("Write XML file End, spents" + (lasting2-lasting) + "MS"); } Catch(Exception e) {System.out.println ("XML File Write Failed"); }         }  

Test this method

/*** dom4j Read and write XML example * *@paramargs *@throwsException*/     Public Static voidMain (string[] args) {dom4jtest<User> d =NewDom4jtest<user>(); User User=NewUser (); User User1=NewUser ("Name 1", "18", "Male"); User User2=NewUser ("Name 2", "19", "female"); User User3=NewUser ("Stone", "20", "female"); List<User> users =NewArraylist<user>();       Users.add (user1);       Users.add (User2);         Users.add (USER3); D.writexmldocument (user, users,"GBK", "Webroot\\web-inf\\student.xml"); }  

At this point the resulting XML file is as follows

View Plaincopy to Clipboardprint?<?xml version= "1.0" encoding= "GBK"?>    <Users>    <User>      <name> name 1</name>      <age>18</age>      <sax> men </sax>    </User>    <User>      <name> name 2</name>      <age>19</age>      <sax> women </sax>    </User>    <User>      <name> stone </name>      <age>20</age>      <sax > Women </sax>    </User>  </Users>  

Implementing a method of reading an XML file to get a collection of objects

/**   *    * @paramXmlpathandname the path and address of the XML file *@paramT Generic Object *@return   */@SuppressWarnings ("Unchecked")        PublicList<t>ReadXML (String xmlpathandname, T t) {Longlasting = System.currenttimemillis ();//Efficiency Testinglist<t> list =NewArraylist<t> ();//Create a list collection        Try{File F=NewFile (Xmlpathandname);//Read FileSaxreader reader =NewSaxreader (); Document Doc= Reader.read (f);//dom4j ReadElement root = Doc.getrootelement ();//Get root nodeElement foo;//Level Two nodeField[] Properties = T.getclass (). Getdeclaredfields ();//get the properties of an instance//The Get method of the instanceMethod Getmeth; //the Set method of the instanceMethod Setmeth;  for(Iterator i = Root.elementiterator (T.getclass (). Getsimplename ()); I.hasnext ();) {//traverse the T.getclass (). Getsimplename () nodeFoo = (Element) i.next ();//Next Level Two nodeT= (T) t.getclass (). newinstance ();//get a new instance of an object                  for(intj = 0; J < Properties.length; J + +) {//traverse all grandchild nodes//the Set method of the instanceSetmeth =T.getclass (). GetMethod ("Set" + properties[j].getname (). substring (0, 1). toUpperCase ()+ properties[j].getname (). SUBSTRING (1), Properties[j].gettype ()); //Properties[j].gettype () is the parameter type of the Set method entry parameter (class type)Setmeth.invoke (t, Foo.elementtext (Properties[j].getname ()));//The value of the corresponding node is stored} list.add (t); }           } Catch(Exception e) {e.printstacktrace (); }           LongLasting2 =System.currenttimemillis (); System.out.println ("Read XML file End, spents" + (lasting2-lasting) + "MS"); returnlist; }  

Test:

 Public Static voidMain (string[] args) {dom4jtest<User> d =NewDom4jtest<user>(); User User=NewUser (); List<User> list= d.readxml ("Webroot\\web-inf\\student.xml", user); System.out.println ("XML file Read results");  for(intI =0;i<list.size (); i++) {User usename=(User) list.get (i); System.out.println ("Name" +usename.getname ()); System.out.println ("Age" +usename.getage ()); System.out.println ("Sax" +Usename.getsax ()); }     }  

Console Print Results:

Name Name 1 age18 sax male name Name 2 age19 sax female name stone age20 sax Female

The corresponding JavaBean object collection is obtained by using reflection and dom4j read JavaBean to generate corresponding XML and read XML.