使用java创建XML文件

Create XML file using java

提问by Harshana

How to create a xml file and save it in some place in my machine using java..there are attributes also include in the xml file? I have found org.w3c.dom.Document but having problems with creating attributes for elements and save the xml file.

如何使用 java 创建一个 xml 文件并将其保存在我机器中的某个位置..xml 文件中还包含属性？我找到了 org.w3c.dom.Document 但在为元素创建属性和保存 xml 文件时遇到问题。

Thank You.

谢谢你。

回答by Andreas Dolk

Have look at dom4jor jdom. Both libraries allow creating a Document and allow printing the document as xml. Both are widly used, pretty easy to use and you'll find a lot of examples and snippets.

看看dom4j或jdom。这两个库都允许创建文档并允许将文档打印为 xml。两者都被广泛使用，非常易于使用，您会发现很多示例和片段。

dom4j - Quick start guide

dom4j - 快速入门指南

回答by npinti

You might want to give XStreama shot, it is not complicated. It basically does the heavy lifting.

您可能想尝试一下XStream，它并不复杂。它基本上完成了繁重的工作。

回答by monica bubna

You can use a DOM XML parser to create an XML file using Java. A good example can be found on this site:

您可以使用 DOM XML 解析器来创建使用 Java 的 XML 文件。可以在此站点上找到一个很好的示例：

try {
    DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance();
    DocumentBuilder docBuilder = docFactory.newDocumentBuilder();

    //root elements
    Document doc = docBuilder.newDocument();

    Element rootElement = doc.createElement("company");
    doc.appendChild(rootElement);

    //staff elements
    Element staff = doc.createElement("Staff");
    rootElement.appendChild(staff);

    //set attribute to staff element
    Attr attr = doc.createAttribute("id");
    attr.setValue("1");
    staff.setAttributeNode(attr);

    //shorten way
    //staff.setAttribute("id", "1");

    //firstname elements
    Element firstname = doc.createElement("firstname");
    firstname.appendChild(doc.createTextNode("yong"));
    staff.appendChild(firstname);

    //lastname elements
    Element lastname = doc.createElement("lastname");
    lastname.appendChild(doc.createTextNode("mook kim"));
    staff.appendChild(lastname);

    //nickname elements
    Element nickname = doc.createElement("nickname");
    nickname.appendChild(doc.createTextNode("mkyong"));
    staff.appendChild(nickname);

    //salary elements
    Element salary = doc.createElement("salary");
    salary.appendChild(doc.createTextNode("100000"));
    staff.appendChild(salary);

    //write the content into xml file
    TransformerFactory transformerFactory =  TransformerFactory.newInstance();
    Transformer transformer = transformerFactory.newTransformer();
    DOMSource source = new DOMSource(doc);

    StreamResult result =  new StreamResult(new File("C:\testing.xml"));
    transformer.transform(source, result);

    System.out.println("Done");

}catch(ParserConfigurationException pce){
    pce.printStackTrace();
}catch(TransformerException tfe){
    tfe.printStackTrace();
}

回答by monica bubna

package com.server;

import java.io.*;

import javax.servlet.*;
import javax.servlet.http.*;

import java.io.*;
import java.sql.Connection;
import java.sql.Date;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;


import org.w3c.dom.*;

import com.gwtext.client.data.XmlReader;

import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.*;
import javax.xml.transform.stream.*;  

public class XmlServlet extends HttpServlet
{ 

  NodeList list;
  Connection con=null;
  Statement st=null;
  ResultSet rs = null;
  String xmlString ;
  BufferedWriter bw;
  String displayTo;
  String displayFrom;
  String addressto;
  String addressFrom;
  Date send;
  String Subject;
  String body;
  String category;
  Document doc1;
  public void doGet(HttpServletRequest request,HttpServletResponse response)
   throws ServletException,IOException{

    System.out.print("on server");  

  response.setContentType("text/html");
  PrintWriter pw = response.getWriter();
  System.out.print("on server");
  try
  {


    DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
    DocumentBuilder docBuilder = builderFactory.newDocumentBuilder();
    //creating a new instance of a DOM to build a DOM tree.
    doc1 = docBuilder.newDocument();
    new XmlServlet().createXmlTree(doc1);

    System.out.print("on server");

  }
  catch(Exception e)
  {
  System.out.println(e.toString());
  }

   }

  public void createXmlTree(Document doc) throws Exception {
  //This method creates an element node

    System.out.println("ruchipaliwal111");

    try
    {

      System.out.println("ruchi111");
      Class.forName("com.mysql.jdbc.Driver");
      con = DriverManager.getConnection("jdbc:mysql://localhost:3308/plz","root","root1");
      st = con.createStatement();

      rs = st.executeQuery("select * from data");


      Element root = doc.createElement("message");
      doc.appendChild(root);

        while(rs.next())
        {



       displayTo=rs.getString(1).toString();
       System.out.println(displayTo+"getdataname");

       displayFrom=rs.getString(2).toString();
       System.out.println(displayFrom +"getdataname");

         addressto=rs.getString(3).toString();
         System.out.println(addressto +"getdataname");

       addressFrom=rs.getString(4).toString();
       System.out.println(addressFrom +"getdataname");

       send=rs.getDate(5);
       System.out.println(send +"getdataname");

       Subject=rs.getString(6).toString();
       System.out.println(Subject +"getdataname");

       body=rs.getString(7).toString();
       System.out.println(body+"getdataname");

      category=rs.getString(8).toString();
       System.out.println(category +"getdataname");


       //adding a node after the last child node of ssthe specified node.


        Element element1 = doc.createElement("Header");
        root.appendChild(element1);


        Element child1 = doc.createElement("To");
        element1.appendChild(child1);

        child1.setAttribute("displayNameTo",displayTo);
        child1.setAttribute("addressTo",addressto);

        Element child2 = doc.createElement("From");
        element1.appendChild(child2);

        child2.setAttribute("displayNameFrom",displayFrom);
        child2.setAttribute("addressFrom",addressFrom);

        Element child3 = doc.createElement("Send");
        element1.appendChild(child3);

        Text text2 = doc.createTextNode(send.toString());
        child3.appendChild(text2);

        Element child4 = doc.createElement("Subject");
        element1.appendChild(child4);

        Text text3 = doc.createTextNode(Subject);
        child4.appendChild(text3);

        Element child5 = doc.createElement("category");
        element1.appendChild(child5);

        Text text44 = doc.createTextNode(category);
        child5.appendChild(text44);


        Element element2 = doc.createElement("Body");
        root.appendChild(element2);

        Text text1 = doc.createTextNode(body);
        element2.appendChild(text1);

       /*
        Element child1 = doc.createElement("name");
        root.appendChild(child1);
        Text text = doc.createTextNode(getdataname);
        child1.appendChild(text);
        Element element = doc.createElement("address");
        root.appendChild(element);
        Text text1 = doc.createTextNode( getdataaddress);
        element.appendChild(text1); 
     */
      } 






//TransformerFactory instance is used to create Transformer objects. 
  TransformerFactory factory = TransformerFactory.newInstance();
  Transformer transformer = factory.newTransformer();

  transformer.setOutputProperty(OutputKeys.INDENT, "yes");
  transformer.setOutputProperty(OutputKeys.METHOD,"xml");
  // transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "3");


  // create string from xml tree
  StringWriter sw = new StringWriter();
  StreamResult result = new StreamResult(sw);
  DOMSource source = new DOMSource(doc);
  transformer.transform(source, result);

  xmlString = sw.toString();


  File file = new File("./war/ds/newxml.xml");
  bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file)));
  bw.write(xmlString);
   }

    catch(Exception e)
    {
      System.out.print("after while loop exception"+e.toString());
    }

  bw.flush();
  bw.close();
  System.out.println("successfully done.....");
  }
}

回答by yegor256

You can use Xembly, a small open source library that makes this XML creating process much more intuitive:

您可以使用Xembly，这是一个小型开源库，它使这个 XML 创建过程更加直观：

String xml = new Xembler(
  new Directives()
    .add("root")
    .add("order")
    .attr("id", "553")
    .set("0.00")
).xml();

Xembly is a wrapper around native Java DOM, and is a very lightweight library.

Xembly 是原生 Java DOM 的包装器，是一个非常轻量级的库。

回答by Cfx

I liked the Xembly syntax, but it is not a statically typed API. You can get this with XMLBeam:

我喜欢 Xembly 语法，但它不是静态类型的 API。您可以使用XMLBeam获得此信息：

// Declare a projection
public interface Projection {

    @XBWrite("/root/order/@id")
    Projection setID(int id);

    @XBWrite("/root/order")
    Projection setValue(String value);
}

public static void main(String[] args) {
    // create a projector
    XBProjector projector = new XBProjector();

    // use it to create a projection instance
    Projection projection = projector.projectEmptyDocument(Projection.class);

    // You get a fluent API, with java types in parameters 
    projection.setID(553).setValue("0.00");

    // Use the projector again to do IO stuff or create an XML-string
    projector.toXMLString(projection);
}

My experience is that this works great even when the XML gets more complicated. You can just decouple the XML structure from your java code structure.

我的经验是，即使 XML 变得更复杂，这也能很好地工作。您可以将 XML 结构与 Java 代码结构分离。

回答by student0495

Just happened to work at this also, use https://www.tutorialspoint.com/java_xml/java_dom_create_document.htmthe example from here, and read the explanations. Also I provide you my own example:

碰巧也在这方面工作，请使用https://www.tutorialspoint.com/java_xml/java_dom_create_document.htm此处的示例，并阅读说明。我还为您提供了我自己的示例：

DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
        Document doc = dBuilder.newDocument();
        // root element


Element rootElement = doc.createElement("words");
            doc.appendChild(rootElement);
while (ptbt.hasNext()) {
                CoreLabel label = ptbt.next();
                System.out.println(label);

                m = r1.matcher(label.toString());
                //System.out.println(m.find());
                if (m.find() == true) {
                    Element w = doc.createElement("word");                  
                    w.appendChild(doc.createTextNode(label.toString()));
                    rootElement.appendChild(w);
                }

TransformerFactory transformerFactory = TransformerFactory.newInstance();
        Transformer transformer = transformerFactory.newTransformer();
        DOMSource source = new DOMSource(doc);
        StreamResult result = new StreamResult(new File("C:\Users\workspace\Tokenizer\tokens.xml"));
        transformer.transform(source, result);
        // Output to console for testing
        StreamResult consoleResult = new StreamResult(System.out);
        transformer.transform(source, consoleResult);

This is in the context of using the tokenizer from Stanford for Natural Language Processing, just a part of it to make an idea on how to add elements. The output is: Billbuyedapples (I've read the sentence from a file)

这是在使用斯坦福大学的分词器进行自然语言处理的背景下，只是其中的一部分，以了解如何添加元素。输出是：Billbuyedapples（我从文件中阅读了这句话）

回答by Arayan Singh

I am providing an answer from my own blog. Hope this will help.

我正在从我自己的博客中提供答案。希望这会有所帮助。

What will be output?

会输出什么？

Following XML file named users.xml will be created.

将创建以下名为 users.xml 的 XML 文件。

<?xml version="1.0" encoding="UTF-8" standalone="no" ?> 
<users>
    <user uid="1">
        <firstname>Interview</firstname>
        <lastname>Bubble</lastname>
        <email>[email protected]</email>
    </user>
</users>

PROCEDURE

程序

Basic steps, in order to create an XML File with a DOM Parser, are:

使用 DOM 解析器创建 XML 文件的基本步骤是：

1. Create a DocumentBuilderinstance.

2. Create a Document from the above DocumentBuilder.

3. Create the elements you want using the Elementclass and its appendChildmethod.

4. Create a new Transformerinstance and a new DOMSourceinstance.

5. Create a new StreamResultto the output stream you want to use.

6. Use transformmethod to write the DOM object to the output stream.

1. 创建一个DocumentBuilder实例。

2. 从上面创建一个文档DocumentBuilder。

3. 使用Element类及其appendChild方法创建您想要的元素。

4. 创建一个新Transformer实例和一个新DOMSource实例。

5. StreamResult为要使用的输出流创建一个新的。

6. 使用transform方法将 DOM 对象写入输出流。

SOURCE CODE:

源代码：

package com.example.TestApp;

import java.io.File;
import java.io.IOException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class CreateXMLFileJava {

 public static void main(String[] args) throws ParserConfigurationException, 
                                               IOException, 
                                               TransformerException
    {
     // 1.Create a DocumentBuilder instance
    DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
    DocumentBuilder dbuilder = dbFactory.newDocumentBuilder();

    // 2. Create a Document from the above DocumentBuilder.
    Document document = dbuilder.newDocument();

    // 3. Create the elements you want using the Element class and its appendChild method.   

   // root element
    Element users = document.createElement("users");
    document.appendChild(users);   

    // child element
    Element user = document.createElement("user");
    users.appendChild(user);  

    // Attribute of child element
    user.setAttribute("uid", "1");   

    // firstname Element
    Element firstName = document.createElement("firstName");
    firstName.appendChild(document.createTextNode("Interview"));
    user.appendChild(firstName);   

    // lastName element
    Element lastName = document.createElement("lastName");
    lastName.appendChild(document.createTextNode("Bubble"));
    user.appendChild(lastName);   

    // email element
    Element email = document.createElement("email");
    email.appendChild(document.createTextNode("[email protected]"));
    user.appendChild(email);   

    // write content into xml file   

    // 4. Create a new Transformer instance and a new DOMSource instance.
   TransformerFactory transformerFactory = TransformerFactory.newInstance();
   Transformer transformer = transformerFactory.newTransformer();
   DOMSource source = new DOMSource(document);

   // 5. Create a new StreamResult to the output stream you want to use.
   StreamResult result = new StreamResult(new File("/Users/admin/Desktop/users.xml"));
   // StreamResult result = new StreamResult(System.out); // to print on console

   // 6. Use transform method to write the DOM object to the output stream.
   transformer.transform(source, result);  

   System.out.println("File created successfully");
 }
}

OUTPUT:

输出：

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<users>
  <user uid="1">
     <firstName>Interview</firstName>
     <lastName>Bubble</lastName>
     <email>[email protected]</email>
  </user>
</users>