dom4j Add, modify, delete xml file

I. How to configure DOM4J XML parsing: Click to view Two. Modify Project class content1.) Add: Documents, tags, attributes 2.) Modify: Property value, Text 3.) Deleting: Tags, properties 1.) Add: Documents, tags, attributes A. Creating text Write.xml

Create text
       Document doc = Documenthelper.createdocument ();

B. Creating labels

Create label
        element rootelem=doc.addelement ("contactlist");//create root tag
        element Contelem = Rootelem.addelement (" Cotact "); Create a child label
        Contelem.addattribute (" id "," 001 ");//Add attribute
        Element Nameelme = contelem.addelement (" name "); /Increase the
        Nameelme.addtext ("John");//Add name
        rootelem.addelement ("cotact");//Add Label

C. Writing the document object created to an XML file

3 Write the Document object created to the XML file
        //Specify the file output location
        fileoutputstream out = new FileOutputStream ("./src/write.xml");
        OutputFormat format = Outputformat.createcompactformat ()//Generate physical file, layout is more chaotic for computer
        outputformat format = Outputformat.createprettyprint ();//Standardized layout for display when viewing.
        //1. Create Write file
        format.setencoding ("Utf-8");//Specify file format 
        XMLWriter writer = new XMLWriter (out,format);
        Writer.write (DOC),//write file
        System.out.println ("write Success");
        Writer.close ();

The results are as follows:

2.) Modify: Attribute value, text

# # #注意: Modify the XML source file One.xml; Write the modified content to Write.xml

<?xml version= "1.0" encoding= "UTF-8"?>
<contactList>
    <contact id= "1" >
        <name> xxx </name>
        <age>20</age>
        <phone>15426354785</phone>
        <qq> 1024557455</qq>
    </contact>
    <contact id= "2" >
        <name> John </name>
        < age>44</age>
        <phone>17854213658</phone>
        <qq>1024532584</qq>
    </contact>
</contactList>

A. Modifying property values

Programme I:

Modify property value The first ID is changed to "003"
        Document doc = new Saxreader (). Read ("./src/one.xml");/Get Tag object
        Element Contele = Doc.getrootelement (). Element ("contact");/Get attribute
        Idatt = contele.attribute ("id");
        Idatt.setvalue ("003");

Programme II:

Modify property value The first ID is changed to "004"
        //element contEle2 = Doc.getrootelement (). Element ("contact");   Get Attribute Object
        //contele2.addattribute ("id", "004");

B. Modifying the text

Modify text  1 get label, 2 Modify text modifies the first name value to Zhang Fei
        element nameele = doc.getrootelement (). Element ("contact"). Element ("name" );
        Nameele.settext ("Zhang Fei");

3.) Delete: tags, properties

# #注意: Delete the XML source file one.xml content; Write the deleted content to Write.xml

<?xml version= "1.0" encoding= "UTF-8"?>
<contactList>
    <contact id= "1" >
        <name> xxx </name>
        <age>20</age>
        <phone>15426354785</phone>
        <qq> 1024557455</qq>
    </contact>
    <contact id= "2" >
        <name> John </name>
        < age>44</age>
        <phone>17854213658</phone>
        <qq>1024532584</qq>
    </contact>
</contactList>

A. Delete labels

Programme I:

Deletes the First Age label
    Element agename = doc.getrootelement (). Element ("contact"). Element (' age '); get the label
    . Agename.detach ()//Delete label

Programme II:

Deletes the First Age label
    Element agename = doc.getrootelement (). Element ("contact"). Element (' age '); get the label
   . Agename.getparent (). Remove (agename);//Get the label's parent tag, and then delete its child labels

B. Delete Properties

Programme I:

Delete 2nd id
   Element Contele = (Element) doc.getrootelement (). elements (). get (1);
   The Property object attribute
   idatt= contele.attribute ("id") is obtained;
   Method one
   Idatt.detach ();//Delete attribute

Programme II:

Delete the 2nd id attribute
  Element contele = (Element) doc.getrootelement (). elements (). get (1);
  The Property object attribute
  idatt= contele.attribute ("id") is obtained;
  Idatt.getparent (). Remove (Idatt);