dom4j 一解析

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mob604757020b64 2013-04-15 21:15:00

文章标签 xml java ide main方法解析xml 文章分类 Java 后端开发

dom4j 解析XML很方便，很容易理解，废话少说，直接看代码。

XML文件，3层的，比较简单：

<?xml version="1.0" encoding="utf-8" ?>
<employees>
  <employee empid="281033" ID="1" >
    <name>Leon   </name>
    <birthDate>1989-12-02</birthDate>
    <hireDate>2011-04-18</hireDate>
    <appartment>Insurance</appartment>
    <salary>3500</salary>
    <leaderId>186903</leaderId>
  </employee>
  <employee empid="281036" ID="2">
    <name>Sam</name>
    <birthDate>1988-12-02</birthDate>
    <hireDate>2011-04-18</hireDate>
    <appartment>Financial</appartment>
    <salary>3500</salary>
    <leaderId>186903</leaderId>
  </employee>
  <employee empid="186903" ID="3">
    <name>Mike</name>
    <birthDate>1978-12-02</birthDate>
    <hireDate>2009-04-18</hireDate>
    <appartment>Insurance</appartment>
    <salary>10000</salary>
    <leaderId>181911</leaderId>
  </employee>
</employees>

JavaBean：

package leon.tool;

import java.util.Date;

public class Employee implements Comparable{
  private String Id;
  private String name;
  private Date birthDate;
  private Date hireDate;
  private String appartment;
  private int salary;
  private String leaderId;

  //constructor
  public Employee(){}
  public Employee(String id){
    this.Id = id;
  }

  //getter and setter
  public String getId() {
    return Id;
  }
  public void setId(String id) {
    Id = id;
  }
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public Date getBirthDate() {
    return birthDate;
  }
  public void setBirthDate(Date birthDate) {
    this.birthDate = birthDate;
  }
  public Date getHireDate() {
    return hireDate;
  }
  public void setHireDate(Date hireDate) {
    this.hireDate = hireDate;
  }
  public String getAppartment() {
    return appartment;
  }
  public void setAppartment(String appartment) {
    this.appartment = appartment;
  }
  public int getSalary() {
    return salary;
  }
  public void setSalary(int salary) {
    this.salary = salary;
  }
  public String getLeaderId() {
    return leaderId;
  }
  public void setLeaderId(String leaderId) {
    this.leaderId = leaderId;
  }

  @Override
  public int compareTo(Object o) {
    Employee e = (Employee) o;
    return this.Id.compareTo(e.Id);
  }
  public boolean equals(Object o){
    Employee e = (Employee) o;
    return this.Id.equals(e.Id);
  }
  public String toString(){
    return this.Id+"\t"+this.name+"\t"+this.salary+"\t"+this.appartment;
  }
}

解析操作的主要类：

package leon.tool;

import java.io.File;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;

public class Dom4jXMLReader {
  public static String XML_FILE_NAME = "employee.xml";
  public static File XML_FILE;
  static{
    XML_FILE = new File(XML_FILE_NAME);
  }

  public static List<Employee> parseXMLForEmployeeList(File xmlFile){
    List<Employee> employeeList = new ArrayList<Employee>();
    SAXReader saxReader = new SAXReader();
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
    try {
      Document doc = saxReader.read(xmlFile);
      Element rootElement = doc.getRootElement();

      for(Iterator iter = rootElement.elementIterator();iter.hasNext();){
        Element element = (Element) iter.next();
        String id = element.attributeValue("empid");
        Employee emp = new Employee(id);

        /*get value method 1*/
        String name = element.element("name").getTextTrim();
        String leaderId = element.element("leaderId").getTextTrim();
        String appartment = element.element("appartment").getTextTrim();
        String birthDateStr = element.element("birthDate").getTextTrim();
        String hireDateStr = element.element("hireDate").getTextTrim();
        String salaryStr = element.element("salary").getTextTrim();
        emp.setName(name);
        emp.setLeaderId(leaderId);
        emp.setAppartment(appartment);
        emp.setBirthDate(sdf.parse(birthDateStr));
        emp.setHireDate(sdf.parse(hireDateStr));
        emp.setSalary(Integer.parseInt(salaryStr));

        /* get value method 2
        for(Iterator innerIter = element.elementIterator();innerIter.hasNext();){
          Element e = (Element) innerIter.next();
          if("name".equalsIgnoreCase(e.getName())){
            emp.setName(e.getTextTrim());
          }else if("birthDate".equalsIgnoreCase(e.getName())){
            emp.setBirthDate(sdf.parse(e.getTextTrim()));
          }else if("hireDate".equalsIgnoreCase(e.getName())){
            emp.setHireDate(sdf.parse(e.getTextTrim()));
          }else if("salary".equalsIgnoreCase(e.getName())){
            emp.setSalary(Integer.parseInt(e.getTextTrim()));
          }else if("appartment".equalsIgnoreCase(e.getName())){
            emp.setAppartment(e.getTextTrim());
          }else if("leaderId".equalsIgnoreCase(e.getName())){
            emp.setLeaderId(e.getTextTrim());
          }
        }
        */
        employeeList.add(emp);
      }

    } catch (DocumentException e) {
      e.printStackTrace();
    } catch (Exception e) {
      e.printStackTrace();
    }

    return employeeList;
  }

  public static Map<String,Employee> parseXMLForEmployeeMap(File xmlFile){
    Map<String,Employee> employeeMap = new HashMap<String,Employee>();
    SAXReader saxReader = new SAXReader();
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
    try {
      Document doc = saxReader.read(xmlFile);
      Element rootElement = doc.getRootElement();
      for(Iterator iter = rootElement.elementIterator();iter.hasNext();){
        Element element = (Element) iter.next();
        String empId = element.attributeValue("empid");
        Employee emp = elementToEmployee(element);
        employeeMap.put(empId, emp);
      }

    } catch (DocumentException e) {
      e.printStackTrace();
    } catch (Exception e) {
      e.printStackTrace();
    }

    return employeeMap;
  }

  public static Employee getEmployeeById(String empId){
    Employee emp = null;
    SAXReader saxReader = new SAXReader();

    try {
      Document doc = saxReader.read(XML_FILE);
      Element rootElement = doc.getRootElement();
      Element empElement = rootElement.elementByID(empId);
      emp = elementToEmployee(empElement);
    } catch (DocumentException e1) {
      e1.printStackTrace();
    } catch (Exception e) {
      e.printStackTrace();
    }

    return emp;
  }

  public static Employee elementToEmployee(Element e) throws Exception{
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");

    String id = e.attributeValue("empid");
    Employee emp = new Employee(id);

    String name = e.element("name").getTextTrim();
    String leaderId = e.element("leaderId").getTextTrim();
    String appartment = e.element("appartment").getTextTrim();
    String birthDateStr = e.element("birthDate").getTextTrim();
    String hireDateStr = e.element("hireDate").getTextTrim();
    String salaryStr = e.element("salary").getTextTrim();

    emp.setName(name);
    emp.setLeaderId(leaderId);
    emp.setAppartment(appartment);
    emp.setBirthDate(sdf.parse(birthDateStr));
    emp.setHireDate(sdf.parse(hireDateStr));
    emp.setSalary(Integer.parseInt(salaryStr));

    return emp;
  }

}

简单的使用main方法跑跑看：

package leon.tool;

import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Collections;
import java.util.List;
import java.util.Map;

public class TestXMLEmployee {

  public static void main(String[] args) {
    File f = new File("employee.xml");
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
    List<Employee> empList = Dom4jXMLReader.parseXMLForEmployeeList(f);

    Collections.sort(empList);

    for(Employee e : empList){
      System.out.println(e+"\t"+e.getLeaderId()+"\t"+sdf.format(e.getHireDate()));
    }

    Employee emp = Dom4jXMLReader.getEmployeeById("1");
    System.out.println(emp);

    Map<String,Employee> employeeMap = Dom4jXMLReader.parseXMLForEmployeeMap(f);
    System.out.println(employeeMap.get("281036"));
  }

}