java之DocumentBuilderFactory解析xml（2）

package com.parse.doc;
public class Student {
  public String name;
  public String age;
  public String sex;
  public Student() {}
  public String getName() {
    return name;
  }
  public void setName(String name) {
    this.name = name;
  }
  public String getAge() {
    return age;
  }
  public void setAge(String age) {
    this.age = age;
  }
  public String getSex() {
    return sex;
  }
  public void setSex(String sex) {
    this.sex = sex;
  }
  @Override
  public String toString() {
    return "name=" + name + ", age=" + age + ", sex=" + sex;
  }
}

package com.parse.doc;
import java.io.ByteArrayInputStream;
import java.util.ArrayList;
import java.util.List;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
public class ParseXml {
  public static String xml = "<Students><student><name><![CDATA[陈喻]]></name><age><![CDATA[26]]></age><sex><![CDATA[男]]></sex></student><student><name><![CDATA[陈彩凤]]></name><age><![CDATA[25]]></age><sex><![CDATA[女]]></sex></student><student><name><![CDATA[陈紫宣]]></name><age><![CDATA[2]]></age><sex><![CDATA[女]]></sex></student><student><name><![CDATA[陈紫曦]]></name><age><![CDATA[7个月]]></age><sex><![CDATA[女]]></sex></student></Students>";
  public static final String STUDENT = "student";
  public static final String NAME = "name";
  public static final String AGE = "age";
  public static final String SEX = "sex";
  public static void main(String args[]) {
    List<Student> students = parseXmlByDoc(xml);
    if (students != null && students.size() > 0) {
      for (Student student : students) {
        System.out.println(student);
      }
    } else {
      System.out.println("students size is 0");
    }
  }
  public static List<Student> parseXmlByDoc(String str) {
    if (str == null || "".equals(str)) {
      System.out.println("str is null or ''");
      return null;
    }
    DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
    List<Student> students = new ArrayList<Student>();
    DocumentBuilder documentBuilder;
    try {
      documentBuilder = documentBuilderFactory.newDocumentBuilder();
      Document document = documentBuilder.parse(new ByteArrayInputStream(str.getBytes()));
      Element rootElement = document.getDocumentElement();
      NodeList studentNodeList = rootElement.getElementsByTagName(STUDENT);
      for (int i = 0; i < studentNodeList.getLength(); i++) {
        Element appElement = (Element) studentNodeList.item(i);
        NodeList studentInfo = appElement.getChildNodes();
        Student student = new Student();
        for(int j = 0; j < studentInfo.getLength(); j++) { 
          Element element = (Element) studentInfo.item(j);
          String appAttr = element.getTagName();
          switch (appAttr) {
            case NAME:
              student.setName(element.getTextContent());
              break;
            case AGE:
              student.setAge(element.getTextContent());
              break;
            case SEX:
              student.setSex(element.getTextContent());
              break;
            default:
              break;
          } 
        }
        students.add(student);
      }
    } catch (Exception e) {
      e.printStackTrace();
      return null;
    }
    return students;
  }
}