java对xml文档的增删改查
package cn.csdn.dao;
import java.io.File;
import java.io.FileWriter;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
import cn.csdn.domain.Sex;
import cn.csdn.domain.Student;
public class StudentDaoImpl implements StudentDao {
private String url = Student.class.getClassLoader().getResource("")
.getPath().replace("%20", " ");
SimpleDateFormat simpleDate = new SimpleDateFormat("yyyy-MM-dd");
public boolean insert(Student entity) {
boolean flag = false;
try {
// 创建解析器
SAXReader saxReader = new SAXReader();
// 加载文件并解析
Document doc = saxReader.read(new File(url + "student.xml"));
// 得到根节点元素
Element root = doc.getRootElement();
// 创建根节点的子元素并添加到根元素里
Element student = root.addElement("student");
// 创建子元素的子元素并添加
student.addElement("name").setText(entity.getName());
student.addElement("age").setText(entity.getAge() + "");
student.addElement("sex").setText(entity.getSex().getValue());
student.addElement("birthday").setText(
simpleDate.format(entity.getBirthday()));
student.addElement("email").setText(entity.getEmail());
student.addElement("address").setText(entity.getAddress());
// 定义格式
OutputFormat outFormat = new OutputFormat(" ", true);
// 获取写入流对象并写入文件
XMLWriter xmlWriter = new XMLWriter(new FileWriter(url
+ "student.xml"), outFormat);
// 将doc对象的属性写入文件
xmlWriter.write(doc);
// 关闭流操作
xmlWriter.close();
flag = true;
} catch (Exception e) {
e.printStackTrace();
}
return flag;
}
public boolean delete(String name) {
boolean falg = false;
try {
SAXReader saxReader = new SAXReader();
Document doc = saxReader.read(new File(url + "student.xml"));
Element root = doc.getRootElement();
@SuppressWarnings("unchecked")
List<Element> list = root.elements();
for (int i = 0; i < list.size(); i++) {
Element stu = list.get(i);
if (stu.element("name").getText().equals(name)) {
stu.getParent().remove(stu);
falg = true;
}
}
// 定义格式
OutputFormat outFormat = new OutputFormat(" ", true);
// 获取写入流对象并写入文件
XMLWriter xmlWriter = new XMLWriter(new FileWriter(url
+ "student.xml"), outFormat);
// 将doc对象的属性写入文件
xmlWriter.write(doc);
// 关闭流操作
xmlWriter.close();
} catch (Exception e) {
e.printStackTrace();
}
return falg;
}
public boolean update(Student entity) {
boolean flag = false;
try {
// 创建解析器
SAXReader saxReader = new SAXReader();
// 加载文件并解析
Document doc = saxReader.read(new File(url + "student.xml"));
// 得到根节点元素
Element root = doc.getRootElement();
// 创建根节点的子元素并添加到根元素里
@SuppressWarnings("unchecked")
List<Element> list = root.elements();
Element student = list.get(entity.getPos());
// 创建子元素的子元素并添加
student.element("name").setText(entity.getName());
student.element("age").setText(entity.getAge() + "");
student.element("sex").setText(entity.getSex().getValue());
student.element("birthday").setText(
simpleDate.format(entity.getBirthday()));
student.element("email").setText(entity.getEmail());
student.element("address").setText(entity.getAddress());
// 定义格式
OutputFormat outFormat = new OutputFormat(" ", true);
// 获取写入流对象并写入文件
XMLWriter xmlWriter = new XMLWriter(new FileWriter(url
+ "student.xml"), outFormat);
// 将doc对象的属性写入文件
xmlWriter.write(doc);
// 关闭流操作
xmlWriter.close();
flag = true;
} catch (Exception e) {
e.printStackTrace();
}
return flag;
}
public Student select(String name) {
Student student = null;
try {
// 创建解析器
SAXReader sax = new SAXReader();
// 装载并解析文件
Document doc = sax.read(new File(url + "student.xml"));
// 获取根元素名称
Element root = doc.getRootElement();
@SuppressWarnings("unchecked")
List<Element> list = root.elements();
for (int i = 0; i < list.size(); i++) {
Element stu = list.get(i);
if (stu.element("name").getText().equals(name)) {
student = new Student();
student.setPos(i);
student.setName(stu.element("name").getText());
if (stu.element("sex").getText().equals("男")) {
student.setSex(Sex.MALE);
} else {
student.setSex(Sex.FEMALE);
}
student.setAge(Integer
.valueOf(stu.element("age").getText()));
student.setEmail(stu.element("email").getText());
student.setAddress(stu.element("address").getText());
student.setBirthday(simpleDate.parse(stu
.element("birthday").getText()));
}
}
} catch (Exception e) {
e.printStackTrace();
}
return student;
}
public List<Student> findAll() {
List<Student> allentites = new ArrayList<Student>();
try {
// 创建解析器
SAXReader sax = new SAXReader();
// 装载并解析文件
Document doc = sax.read(new File(url + "student.xml"));
// 获取根元素名称
Element root = doc.getRootElement();
@SuppressWarnings("unchecked")
List<Element> list = root.elements();
for (int i = 0; i < list.size(); i++) {
Element stu = list.get(i);
Student student = new Student();
student.setPos(i);
student.setName(stu.element("name").getText());
if (stu.element("sex").getText().equals("男")) {
student.setSex(Sex.MALE);
} else {
student.setSex(Sex.FEMALE);
}
student.setAge(Integer.valueOf(stu.element("age").getText()));
student.setEmail(stu.element("email").getText());
student.setAddress(stu.element("address").getText());
student.setBirthday(simpleDate.parse(stu.element("birthday")
.getText()));
allentites.add(student);
}
} catch (Exception e) {
e.printStackTrace();
}
return allentites;
}
public boolean delete(Student entity) {
boolean falg = false;
try {
SAXReader saxReader = new SAXReader();
Document doc = saxReader.read(new File(url + "student.xml"));
Element root = doc.getRootElement();
@SuppressWarnings("unchecked")
List<Element> list = root.elements();
for (int i = 0; i < list.size(); i++) {
Element stu = list.get(i).element("name");
if (stu.getText().equals(entity.getName())) {
System.out.println(stu.getText() + "---------" + url);
stu.getParent().getParent().remove(stu.getParent());
falg = true;
}
}
// 定义格式
OutputFormat outFormat = new OutputFormat(" ", true);
// 获取写入流对象并写入文件
XMLWriter xmlWriter = new XMLWriter(new FileWriter(url
+ "student.xml"), outFormat);
// 将doc对象的属性写入文件
xmlWriter.write(doc);
// 关闭流操作
xmlWriter.close();
} catch (Exception e) {
e.printStackTrace();
}
return falg;
}
}
如有疑问，请留言！
