Write content to an XML document

 PackageGz.itcast.a_dom4j_write;ImportJava.io.File;ImportJava.io.FileOutputStream;ImportOrg.dom4j.Document;ImportOrg.dom4j.io.SAXReader;ImportOrg.dom4j.io.XMLWriter;/** * First write content to XML document * @author APPle * */ Public  class Demo1 {     Public Static void Main(string[] args)throwsexception{//One, read or create a Document object        //Read XM file for DAY07 projectDocument doc =NewSaxreader (). Read (NewFile ("./src/contact.xml"));//Second, modify the Document object content        //Third, write the modified document object into the XML document        //Specify the location of the file outputFileOutputStream out =NewFileOutputStream ("E:/contact.xml");//1. Creating a write-out objectXMLWriter writer =NewXMLWriter (out);//2. Writing ObjectsWriter.write (DOC);//3. Closing a streamWriter.close (); }}

 PackageGz.itcast.a_dom4j_write;ImportJava.io.File;ImportJava.io.FileOutputStream;ImportOrg.dom4j.Document;ImportOrg.dom4j.io.OutputFormat;ImportOrg.dom4j.io.SAXReader;ImportOrg.dom4j.io.XMLWriter;/** * Discuss the details of writing the content to the XML document * @author APPle * * * * Public  class Demo2 {    /** * @param args * *     Public Static void Main(string[] args)throwsexception{Document doc =NewSaxreader (). Read (NewFile ("./src/contact.xml"));//Specify the location of the file outputFileOutputStream out =NewFileOutputStream ("E:/contact.xml");/** * 1. Specify the format written out */OutputFormat format = Outputformat.createcompactformat ();//compact format. Remove whitespace wrapping. When the project is on the line        //outputformat format = Outputformat.createprettyprint ();///beautiful formats. There are spaces and line breaks. When developing and debugging        /** * 2. Specifies that the encoding of the generated XML document * also affects the encoding of the XML document when it is saved and the encoding encoding of the XML document declaration (encoding at XML parsing) * Conclusion: Using this method to produce         XML document to avoid Chinese garbled problems. */Format.setencoding ("Utf-8");//1. Creating a write-out objectXMLWriter writer =NewXMLWriter (Out,format);//2. Writing ObjectsWriter.write (DOC);//3. Closing a streamWriter.close (); }}

 PackageGz.itcast.a_dom4j_write;ImportJava.io.File;ImportJava.io.FileOutputStream;ImportOrg.dom4j.Attribute;ImportOrg.dom4j.Document;ImportOrg.dom4j.DocumentHelper;ImportOrg.dom4j.Element;ImportOrg.dom4j.io.OutputFormat;ImportOrg.dom4j.io.SAXReader;ImportOrg.dom4j.io.XMLWriter;ImportOrg.junit.Test;/** * Modify XML content * Add: Document, Tag, properties * Modify: Attribute value, text * Delete: Tag, attribute * @author APPle * */ Public  class Demo3 {    /** * Added: Documents, tags, attributes */    @Test     Public void test1()throwsexception{/** * 1. Create a document * /Document doc = Documenthelper.createdocument ();/** * 2. Add label * /Element Rootelem = doc.addelement ("ContactList");//doc.addelement ("ContactList");Element Contactelem = rootelem.addelement ("Contact"); Contactelem.addelement ("Name");/** * 3. Add attributes * /Contactelem.addattribute ("id","001"); Contactelem.addattribute ("Name","Eric");//write out the modified document object to the XML documentFileOutputStream out =NewFileOutputStream ("F:/contact.xml");        OutputFormat format = Outputformat.createprettyprint (); Format.setencoding ("Utf-8"); XMLWriter writer =NewXMLWriter (Out,format);        Writer.write (DOC);    Writer.close (); }/** * Modify: Attribute value, text * @throws Exception */    @Test     Public void test2()throwsexception{Document doc =NewSaxreader (). Read (NewFile ("./src/contact.xml"));/** * Scenario One: Modify the property value 1. Get the Label Object 2. Get Property Object 3. Modify the property value * /        //1.1 Get Tag Object        /* Element Contactelem = doc.getrootelement (). Element ("contact");        1.2 Get the Attribute object Attribute idattr = Contactelem.attribute ("id");        1.3 Modify the attribute value Idattr.setvalue ("003"); */        /** * Scenario Two: Modifying attribute values */        //1.1 Get Tag Object        /* Element Contactelem = doc.getrootelement (). Element ("contact");        1.2 Modify the property value Contactelem.addattribute ("id", "004") by adding a property of the same name. */        /** * Modify Text 1. Get the Label Object 2. Modify Text * /Element Nameelem = Doc.getrootelement (). Element"Contact"). Element ("Name"); Nameelem.settext ("John Doe"); FileOutputStream out =NewFileOutputStream ("E:/contact.xml");        OutputFormat format = Outputformat.createprettyprint (); Format.setencoding ("Utf-8"); XMLWriter writer =NewXMLWriter (Out,format);        Writer.write (DOC);    Writer.close (); }/** * Delete: Tags, properties * @throws Exception */    @Test     Public void test3()throwsexception{Document doc =NewSaxreader (). Read (NewFile ("./src/contact.xml"));/** * 1. Delete Label 1.1 get Label Object 1.2 Delete Tag Object * /        //1.1 Get Tag Object        / * Element Ageelem = doc.getrootelement (). Element ("contact"). Element ("age");        1.2 Delete Tag object Ageelem.detach ();        Ageelem.getparent (). Remove (Ageelem); */        /** * 2. Delete Attribute 2.1 Get Property Object 2.2 Delete attribute * /        //2.1 Get Property Object        //Get a second contact labelElement Contactelem = (Element) doc.getrootelement (). Elements (). Get (1);//2.2 Get Property ObjectAttribute idattr = Contactelem.attribute ("id");//2.3 Deleting PropertiesIdattr.detach ();//idattr.getparent (). Remove (idattr);FileOutputStream out =NewFileOutputStream ("E:/contact.xml");        OutputFormat format = Outputformat.createprettyprint (); Format.setencoding ("Utf-8"); XMLWriter writer =NewXMLWriter (Out,format);        Writer.write (DOC);    Writer.close (); }}

 PackageGz.itcast.a_dom4j_write;ImportJava.io.File;ImportJava.io.FileOutputStream;ImportJava.util.Iterator;ImportOrg.dom4j.Document;ImportOrg.dom4j.DocumentHelper;ImportOrg.dom4j.Element;ImportOrg.dom4j.io.OutputFormat;ImportOrg.dom4j.io.SAXReader;ImportOrg.dom4j.io.XMLWriter;ImportOrg.junit.Test;/** * 1. Use the DOM4J API to generate the following XML file <students><student id= "1" > <name> Zhang San </name> <gender > Male </gender> <grade> Computer Class 1 </grade> <address> Guangzhou tianhe </address></Student><    Student id= "2" > <name> John Doe </name> <gender> Women </gender> <grade> Computer Class 2 </grade> <address> Guangzhou yuexiu </address></student></students>2. Change the name of the student with ID 2 to "Wang Li" 3. Delete student with ID 2 * @ Author APPle * * * * Public  class Demo4 {    /** * 1. Generate the specified XML document * @throws Exception */    @Test     Public void test1()throwsexception{//1. Memory Creation XML DocumentDocument doc = Documenthelper.createdocument ();//2. Writing contentElement Rootelem = doc.addelement ("Students");//2.1 Add TagElement studentElem1 = rootelem.addelement ("Student");//2.2 Adding PropertiesStudentelem1.addattribute ("id","1");//2.3 Add tags while setting the textStudentelem1.addelement ("Name"). SetText ("Zhang San"); Studentelem1.addelement ("Gender"). SetText ("Male"); Studentelem1.addelement ("Grade"). SetText ("Computer Class 1"); Studentelem1.addelement ("Address"). SetText ("Guangzhou Tianhe");//2.1 Add TagElement studentElem2 = rootelem.addelement ("Student");//2.2 Adding PropertiesStudentelem2.addattribute ("id","2");//2.3 Add tags while setting the textStudentelem2.addelement ("Name"). SetText ("John Doe"); Studentelem2.addelement ("Gender"). SetText ("female"); Studentelem2.addelement ("Grade"). SetText ("Computer Class 2"); Studentelem2.addelement ("Address"). SetText ("Guangzhou Yuexiu");//3. Content written out to an XML file        //3.1 Output PositionFileOutputStream out =NewFileOutputStream ("E:/student.xml");//3.2 Specifying formatsOutputFormat format = Outputformat.createprettyprint ();//Set encodingFormat.setencoding ("Utf-8"); XMLWriter writer =NewXMLWriter (Out,format);//3.3 Write ContentWriter.write (DOC);//3.4 Closing ResourcesWriter.close (); }/** * 2. Change the name of the student with ID 2 * @throws Exception */    @Test     Public void test2()throwsexception{//1. Query to a student with ID 2Document doc =NewSaxreader (). Read (NewFile ("E:/student.xml"));//1.1 Find all the student tagsIterator<element> it = doc.getrootelement (). Elementiterator ("Student"); while(It.hasnext ()) {Element Stuelem = It.next ();//1.2 Query ID for student tag            if(Stuelem.attributevalue ("id"). Equals ("2") {Stuelem.element ("Name"). SetText ("Wang Li"); Break; }        }//3.1 Output PositionFileOutputStream out =NewFileOutputStream ("E:/student.xml");//3.2 Specifying formatsOutputFormat format = Outputformat.createprettyprint ();//Set encodingFormat.setencoding ("Utf-8"); XMLWriter writer =NewXMLWriter (Out,format);//3.3 Write ContentWriter.write (DOC);//3.4 Closing ResourcesWriter.close (); }/** * 3. Delete student with ID 2 * @throws Exception */    @Test     Public void test3()throwsexception{//1. Query to a student with ID 2Document doc =NewSaxreader (). Read (NewFile ("E:/student.xml"));//1.1 Find all the student tagsIterator<element> it = doc.getrootelement (). Elementiterator ("Student"); while(It.hasnext ()) {Element Stuelem = It.next ();//1.2 Query ID for student tag            if(Stuelem.attributevalue ("id"). Equals ("2")){//1.3 Delete the student tagStuelem.detach (); Break; }        }//3.1 Output PositionFileOutputStream out =NewFileOutputStream ("E:/student.xml");//3.2 Specifying formatsOutputFormat format = Outputformat.createprettyprint ();//Set encodingFormat.setencoding ("Utf-8"); XMLWriter writer =NewXMLWriter (Out,format);//3.3 Write ContentWriter.write (DOC);//3.4 Closing ResourcesWriter.close (); }}

Write content to an XML document