Read the following score.xml file, convert it into a JSON Object object, and output the string expression of the JSON Object. Finally, according to the value of JSON Object and the style of score.xml, score2.xml is regenerated.
<student>
<name>Tom</name>
<subject>math</subject>
<score>80</score>
</student>
The method of reading and writing xml is not limited, and the method of JSON processing is not limited.
Code:
Student.class
package xml.stax;
import java.util.List;
public class Student {
private String name;
private String subject;
private String score;
public Student() {
}
public Student(String name,String subject, String score) {
this.name = name;
this.subject=subject;
this.score = score;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSubject() {
return subject;
}
public void setSubject(String subject) {
this.subject = subject;
}
public String getScore() {
return score;
}
public void setScore(String score) {
this.score = score;
}
}
Xml2json
package xml.stax;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.File;
import java.util.*;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.reflect.TypeToken;
public class Xml2json {
static ArrayList<Student> S=new ArrayList<Student>();
public static void readXml()
{
try
{
//采用Dom解析xml文件，固定格式
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
Document document = db.parse("C:\\Users\\86187\\desktop\\score.xml");
//获取所有的一级子节点
NodeList usersList = document.getChildNodes();
for (int i = 0; i < usersList.getLength(); i++)
{
Node users = usersList.item(i); //一级子节点
if (users.getNodeType() == Node.ELEMENT_NODE) {
NodeList userList = users.getChildNodes(); //获取二级子节点user的列表
Student tmp=new Student();
for (int j = 0; j < userList.getLength(); j++) //9
{
Node meta = userList.item(j);//二级子节点
if (meta.getNodeType() == Node.ELEMENT_NODE)
{
String tag=userList.item(j).getNodeName();
if(tag.equals("name")) {
tmp.setName(meta.getTextContent());
}
else if(tag.equals("subject")) {
tmp.setSubject(meta.getTextContent());
}
else {
tmp.setScore(meta.getTextContent());
}
}
}
S.add(tmp);
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
public static void createAndWrite() {
Gson gson = new Gson();
for(int i=0;i<S.size();i++) {
String ob = gson.toJson(S.get(i));
System.out.println(ob);
JsonObject json = gson.toJsonTree(S.get(i)).getAsJsonObject();
try {
DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
DocumentBuilder dbBuilder = dbFactory.newDocumentBuilder();
//新创建一个Document节点
Document document = dbBuilder.newDocument();
if (document != null)
{
Element student = document.createElement("student"); //都是采用Document创建元素
Element name = document.createElement("name");
Element score = document.createElement("score");
Element subject = document.createElement("subject");
name.appendChild(document.createTextNode(gson.fromJson(json.get("name"),String.class)));
score.appendChild(document.createTextNode(gson.fromJson(json.get("score"),String.class)));
subject.appendChild(document.createTextNode(gson.fromJson(json.get("subject"),String.class)));
student.appendChild(name);
student.appendChild(score);
student.appendChild(subject);
document.appendChild(student); //把docx挂在document下
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
DOMSource source = new DOMSource(document);
//定义目标文件
File file = new File("C:\\Users\\86187\\desktop\\score2.xml");
StreamResult result = new StreamResult(file);
//将xml内容写入到文件中
transformer.transform(source, result);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
public static void main(String[] args) {
readXml();
createAndWrite();
}
}