java调用xml删除,Java XML解析之读取,添加,删除,修改

秒速五厘米 2023-01-13 06:14 181阅读 0赞

下载依赖 jar 包

dom4j-1.6.1.jar

jaxen-1.1-beta-6.jar

package com.xml;

import java.io.File;

import java.io.FileWriter;

import java.io.IOException;

import java.io.Writer;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

import org.dom4j.Document;

import org.dom4j.DocumentException;

import org.dom4j.Element;

import org.dom4j.io.OutputFormat;

import org.dom4j.io.SAXReader;

import org.dom4j.io.XMLWriter;

import com.entity.Student;

public class TestTextXml \{

//遍历

public static void testReader() \{

SAXReader reader = new SAXReader();

try \{

Document doc = reader.read(new File("student2.xml"));

List elementList = doc.selectNodes("/data/student");

for (Element element : elementList) \{

Iterator childIter = element.elementIterator();

while (childIter.hasNext()) \{

Element childElement = childIter.next();

System.out.println(childElement.getName() + "=" + childElement.getText());

\} catch (DocumentException e) \{

e.printStackTrace();

//遍历

public static List testReader2() \{

List studentList = new ArrayList();

SAXReader reader = new SAXReader();

try \{

Document doc = reader.read(new File("student2.xml"));

List elementList = doc.selectNodes("/data/student");

for (Element element : elementList) \{

Iterator childIter = element.elementIterator();

Student student = null;

while (childIter.hasNext()) \{

if (student == null) \{

student = new Student();

Element childElement = childIter.next();

String tag = childElement.getName();

if ("name".equals(tag)) \{

student.setName(childElement.getText());

\} else if ("age".equals(tag)) \{

student.setAge(Integer.parseInt(childElement.getText()));

if (student != null) \{

studentList.add(student);

student = null;

\} catch (DocumentException e) \{

e.printStackTrace();

return studentList;

//添加

public static void testAdd() \{

SAXReader reader = new SAXReader();

XMLWriter writer = null;

try \{

Document doc = reader.read(new File("student2.xml"));

Element root = doc.getRootElement();

Element studentElement = root.addElement("student");

Element nameElement = studentElement.addElement("name");

nameElement.setText("王涛");

Element ageElement = studentElement.addElement("age");

ageElement.setText("26");

OutputFormat format = OutputFormat.createPrettyPrint();

writer = new XMLWriter(new FileWriter("student2.xml"), format);

writer.write(doc);

writer.flush();

\} catch (DocumentException e) \{

e.printStackTrace();

\} catch (IOException e) \{

e.printStackTrace();

\} finally \{

try \{

writer.close();

\} catch (IOException e) \{

e.printStackTrace();

//修改

public static void testUpdate(Student item) \{

SAXReader reader = new SAXReader();

XMLWriter writer = null;

try \{

Document doc = reader.read(new File("student2.xml"));

List elementList = doc.selectNodes("/data/student");

for (Element element : elementList) \{

Iterator childIter = element.elementIterator();

boolean isUpdate = false;

while (childIter.hasNext()) \{

Element childElement = childIter.next();

String tag = childElement.getName();

if ("name".equals(tag) && item.getName().equals(childElement.getText())) \{

isUpdate = true;

if (isUpdate) \{

if ("age".equals(tag)) \{

childElement.setText(String.valueOf(item.getAge()));

if (isUpdate) \{

isUpdate = false;

break;

OutputFormat format = OutputFormat.createPrettyPrint();

writer = new XMLWriter(new FileWriter("student2.xml"), format);

writer.write(doc);

writer.flush();

\} catch (DocumentException e) \{

e.printStackTrace();

\} catch (IOException e) \{

e.printStackTrace();

\} finally \{

try \{

writer.close();

\} catch (IOException e) \{

e.printStackTrace();

//删除

public static void testDelete(String name) \{

SAXReader reader = new SAXReader();

XMLWriter writer = null;

try \{

Document doc = reader.read(new File("student2.xml"));

List elementList = doc.selectNodes("/data/student");

for (Element element : elementList) \{

Iterator childIter = element.elementIterator();

while (childIter.hasNext()) \{

Element childElement = childIter.next();

String tag = childElement.getName();

if ("name".equals(tag) && name.equals(childElement.getText())) \{

element.getParent().remove(element);

OutputFormat format = OutputFormat.createPrettyPrint();

writer = new XMLWriter(new FileWriter("student2.xml"), format);

writer.write(doc);

writer.flush();

\} catch (DocumentException e) \{

e.printStackTrace();

\} catch (IOException e) \{

e.printStackTrace();

\} finally \{

try \{

writer.close();

\} catch (IOException e) \{

e.printStackTrace();

//将数据库数据 转换成 xml 文件

public static void testGenerateXML(List studentList) \{

Writer writer = null;

try \{

writer = new FileWriter("student3.xml");

StringBuilder sb = new StringBuilder();

sb.append("<?xml version=\\"1.0\\" encoding=\\"UTF-8\\"?>\\n");

sb.append("\\n");

for (Student student : studentList) \{

sb.append("\\n");

sb.append("" + student.getName() + "\\n");

sb.append("" + student.getAge() + "\\n");

sb.append("\\n");

sb.append("");

writer.write(sb.toString());

\} catch (IOException e) \{

e.printStackTrace();

\} finally \{

try \{

writer.close();

\} catch (IOException e) \{

e.printStackTrace();

public static void main(String\[\] args) \{

//testAdd();

//testUpdate(new Student("李军",29));

testDelete("王涛");

List studentList = testReader2();

for (Student student : studentList) \{

System.out.println(student.getName() + "," + student.getAge());

testGenerateXML(studentList);

package com.entity;

public class Student \{

private String name;

private int age;

private int money;

private String address;

private Course course;

public Student() \{

super();

System.out.println("student");

public Student(String name, int age) \{

super();

this.name = name;

this.age = age;

System.out.println(this.name + "," + this.age);

public String getName() \{

return name;

public void setName(String name) \{

this.name = name;

public int getAge() \{

return age;

public void setAge(int age) \{

this.age = age;

private String getHello() \{

return "hello";

student2.xml 文件格式

李军

李浩

java调用xml删除,Java XML解析之读取,添加,删除,修改

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