使用DOM4J向xml中写入文档和删除指定的元素、在指定位置插入元素

-----------------------------------------使用DOM4J向xml中写入文档和删除指定的元素、在指定位置插入元素------------------------------------

将student对象写入xml文档中

Student类

package cn.tx.dom4j;

public class Student {

private Integer studNo;

private String name;

private String address;

private Integer gender;

private Integer score;

public Integer getStudNo() {

return studNo;

}

public void setStudNo(Integer studNo) {

this.studNo = studNo;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getAddress() {

return address;

}

public void setAddress(String address) {

this.address = address;

}

public Integer getGender() {

return gender;

}

public void setGender(Integer gender) {

this.gender = gender;

}

public Integer getScore() {

return score;

}

public void setScore(Integer score) {

this.score = score;

}

public Student(Integer studNo, String name, String address, Integer gender, Integer score) {

super();

this.studNo = studNo;

this.name = name;

this.address = address;

this.gender = gender;

this.score = score;

}

DOM4J向xml中写入student示例

package cn.tx.dom4j;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;

import org.dom4j.Document;

import org.dom4j.DocumentHelper;

import org.dom4j.Element;

import org.dom4j.io.OutputFormat;

import org.dom4j.io.XMLWriter;

public class WriterXML {

public static void writerXML() {

List<Student> stuList = new ArrayList<Student>();

for (int i = 1; i < 10; i++) {

Student s = new Student(i, "学生"+i, "中国", 1, 90+i);

stuList.add(s);

}

//创建xml的文档对象

Document doc = DocumentHelper.createDocument();

//添加根节点

Element root = doc.addElement("students");

//遍历集合写入student节点

for (Student s : stuList) {

//在根节点上添加student元素，并且给student元素添加属性

Element stuElement = root.addElement("student")

.addAttribute("stuNo", s.getStudNo()+"")

.addAttribute("gender", s.getGender()+"");

//在student元素中加入name,address,score元素

stuElement.addElement("name").setText(s.getName());

stuElement.addElement("address").setText(s.getAddress());

stuElement.addElement("score").setText(s.getScore()+"");

}

FileOutputStream out = null;

XMLWriter xw = null;

try {

//创建文件输出流

out = new FileOutputStream("src/student.xml");

//创建漂亮的格式化对象

OutputFormat of = OutputFormat.createPrettyPrint();

//创建xml输出对象

xw = new XMLWriter(out, of);

//把文档对象写入到xml中

xw.write(doc);

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

if(xw != null) {

xw.close();

}

if(out != null) {

out.close();

}

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

通过DOM4J删除xml中的元素

package cn.tx.dom4j;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;

import org.dom4j.Document;

import org.dom4j.DocumentException;

import org.dom4j.DocumentHelper;

import org.dom4j.Element;

import org.dom4j.io.OutputFormat;

import org.dom4j.io.SAXReader;

import org.dom4j.io.XMLWriter;

public class WriterXML {

/**

* 删除xml中的元素

* @param stuNO 指定删除sutdent元素的ID

public static void deleteStudent(int stuNo) {

XMLWriter xw = null;

//创建SAXReader对象

SAXReader reader = new SAXReader();

try {

//通过reader对象获得xml文档对象

Document doc = reader.read(new FileInputStream("src/student.xml"));

//通过doc获得xml的根元素

Element root = doc.getRootElement();

//通过根元素获得所有的子元素集合

List<Element> eList = root.elements();

//遍历子元素集合

for (Element e : eList) {

//通过子元素获得student的id属性的值

Integer stuNoVal = new Integer(e.attributeValue("stuNo"));

if(stuNo == stuNoVal) {

//需要通过父节点来删除

//获得父节点

Element pElement = e.getParent();

//通过父节点删除元素

pElement.remove(e);

break;

}

//创建写入XML的对象

xw = new XMLWriter(new FileOutputStream("src/student.xml"), OutputFormat.createPrettyPrint());

xw.write(doc);

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

if(xw != null) {

xw.close();

}

} catch (IOException e) {

e.printStackTrace();

}

通过DOM4J向xml文档指定位置插入元素

package cn.tx.dom4j;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;

import org.dom4j.Document;

import org.dom4j.DocumentException;

import org.dom4j.DocumentHelper;

import org.dom4j.Element;

import org.dom4j.io.OutputFormat;

import org.dom4j.io.SAXReader;

import org.dom4j.io.XMLWriter;

import org.dom4j.tree.DefaultElement;

public class WriterXML {

/**

* 向xml中插入新的元素

* @param stuNO 在sutdent元素的ID的后面插入新的元素

public static void insertStudent(int stuNo) {

XMLWriter xw = null;

//创建SAXReader对象

SAXReader reader = new SAXReader();

try {

//通过reader对象获得xml文档对象

Document doc = reader.read(new FileInputStream("src/student.xml"));

//通过doc获得xml的根元素

Element root = doc.getRootElement();

//查看root的具体类,获得root是属于DefaultElement的实例

System.out.println(root.getClass());

//通过根元素获得所有的子元素集合

List<Element> eList = root.elements();

//新建一个student元素

Element student7 = new DefaultElement("student");

//向student7中添加属性

student7.addAttribute("stuNo", "7");

student7.addAttribute("gender", "1");

//向student7元素中添加子元素，并且写入内容

student7.addElement("name").setText("李四");

student7.addElement("address").setText("中国");

student7.addElement("score").setText("90");

//遍历子元素集合

for(int i =0 ; i < eList.size(); i++) {

//获得集合中的元素

Element e = eList.get(i);

//通过子元素获得student的id属性的值

Integer stuNoVal = new Integer(e.attributeValue("stuNo"));

System.out.println(eList.indexOf(e));

if(stuNo == stuNoVal) {

//获得元素的索引

int index = eList.indexOf(e);

System.out.println(index);

//将student7元素加入到eList集合中,集合中在指定索引处添加元素会把原来位置的索引忘后面移动

//注意向xml文档中添加元素时，一个元素对象只能添加一次，不能重复添加

eList.add(index+1, student7);

}

//创建写入XML的对象

xw = new XMLWriter(new FileOutputStream("src/student.xml"), OutputFormat.createPrettyPrint());

xw.write(doc);

} catch (Exception e) {

e.printStackTrace();

} finally {

try {

if(xw != null) {

xw.close();

}

} catch (IOException e) {

e.printStackTrace();

}

Student.xml文档

<?xml version="1.0" encoding="UTF-8"?>

</student>

</student>

</student>

</student>

</student>

</student>

</student>

</student>

</student>

</students>

使用DOM4J向xml中写入文档和删除指定的元素、在指定位置插入元素

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