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Add day02_exam
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‎day02_exam/lib/dom4j-1.6.1.jar‎

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‎day02_exam/lib/jaxen-1.1-beta-6.jar‎

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‎day02_exam/src/cn/itcast/dao/IStudentDao.java‎

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package cn.itcast.dao;
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import cn.itcast.domain.Student;
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public interface IStudentDao {
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/**
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* 添加学生信息到XML中
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* @param s
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* @return
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*/
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boolean createStudent(Student s);
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/**
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* 根据准考证号查询学生信息
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* @param examid
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* @return 如果学生不存在，返回null
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*/
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Student findStudent(String examid);
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/**
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* 根据学生姓名删除学生
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* @param name
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* @return 如果人不存在也返回false
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*/
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boolean deleteStudent(String name);
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}

‎day02_exam/src/cn/itcast/dao/StudentDao.java‎

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package cn.itcast.dao;
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import org.w3c.dom.Document;
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import org.w3c.dom.Element;
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import org.w3c.dom.Node;
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import org.w3c.dom.NodeList;
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import cn.itcast.domain.Student;
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import cn.itcast.util.DocumentUtil;
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//异常：抛的话，上层能解决才行
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//上一层如果处理不了，自己必须处理。
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public class StudentDao implements IStudentDao {
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/**
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* 添加学生信息到XML中
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* @param s
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* @return
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*/
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public boolean createStudent(Student s){
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System.out.println("JAXP");
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//目标：在根元素exam中添加student子元素
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boolean result = false;
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try {
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Document document = DocumentUtil.getDocument();
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//创建name、location、grade元素并设置其主体内容
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Element nameE = document.createElement("name");
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nameE.setTextContent(s.getName());
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Element locationE = document.createElement("location");
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locationE.setTextContent(s.getLocation());
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Element gradeE = document.createElement("grade");
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gradeE.setTextContent(s.getGrade()+"");
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//创建student元素，并设置其属性
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Element studentE = document.createElement("student");
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studentE.setAttribute("idcard", s.getIdcard());
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studentE.setAttribute("examid", s.getExamid());//CTRL+ALT+ARROW
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studentE.appendChild(nameE);
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studentE.appendChild(locationE);
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studentE.appendChild(gradeE);
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//得到exam元素，把student挂接上去
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Node node = document.getElementsByTagName("exam").item(0);
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node.appendChild(studentE);
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//写回XML文件中
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DocumentUtil.write2xml(document);
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result = true;
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} catch (Exception e) {
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throw new RuntimeException(e);//异常转义。异常链
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}
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return result;
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}
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/**
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* 根据准考证号查询学生信息
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* @param examid
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* @return 如果学生不存在，返回null
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*/
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public Student findStudent(String examid){
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Student s = null;
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try{
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//得到Document对象
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Document document = DocumentUtil.getDocument();
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//得到所有的student元素
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NodeList nl = document.getElementsByTagName("student");
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//遍历student元素，判断他的examid属性的取值是否与参数匹配
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for(int i=0;i<nl.getLength();i++){
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Node node = nl.item(i);
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// if(node.getNodeType()==Node.ELEMENT_NODE){
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// Element e = (Element)node;
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if(node instanceof Element){
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Element e = (Element)node;
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if(e.getAttribute("examid").equals(examid)){
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//如果匹配：说明找到了学生；创建学生对象
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s = new Student();
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//设置学生对象的各个属性取值
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s.setExamid(examid);
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s.setIdcard(e.getAttribute("idcard"));
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s.setName(e.getElementsByTagName("name").item(0).getTextContent());
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s.setLocation(e.getElementsByTagName("location").item(0).getTextContent());
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s.setGrade(Float.parseFloat(e.getElementsByTagName("grade").item(0).getTextContent()));
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}
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}
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}
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}catch(Exception e){
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throw new RuntimeException(e);
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}
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return s;
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}
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/**
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* 根据学生姓名删除学生
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* @param name
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* @return 如果人不存在也返回false
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*/
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public boolean deleteStudent(String name){
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boolean result = false;
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try{
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//得到Document对象
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Document document = DocumentUtil.getDocument();
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//得到所有的name元素
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NodeList nl = document.getElementsByTagName("name");
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//遍历name元素，判断其主体内容是否与参数一致
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for(int i=0;i<nl.getLength();i++){
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//如果一致：找到他的爸爸的爸爸，删除它的爸爸
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Node n = nl.item(i);
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if(n.getTextContent().equals(name)){
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n.getParentNode().getParentNode().removeChild(n.getParentNode());
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//写回XML文档
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DocumentUtil.write2xml(document);
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result = true;
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break;
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}
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}
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}catch(Exception e){
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throw new RuntimeException(e);
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}
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return result;
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}
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}

‎day02_exam/src/cn/itcast/dao/StudentDom4JDao.java‎

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package cn.itcast.dao;
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import java.util.List;
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import org.dom4j.Document;
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import org.dom4j.Element;
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import org.dom4j.Node;
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import cn.itcast.domain.Student;
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import cn.itcast.util.Dom4JUtil;
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public class StudentDom4JDao implements IStudentDao{
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@Override
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public boolean createStudent(Student s) {
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System.out.println("Dom4j");
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boolean result = false;
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try{
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//得到Document对象
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Document document = Dom4JUtil.getDocument();
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//得到根元素
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Element root = document.getRootElement();
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//加数据即可<student>
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Element studentE = root.addElement("student")
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.addAttribute("examid", s.getExamid())
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.addAttribute("idcard", s.getIdcard());
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studentE.addElement("name").setText(s.getName());
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studentE.addElement("location").setText(s.getLocation());
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studentE.addElement("grade").setText(s.getGrade()+"");
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//写回XML文档
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Dom4JUtil.write2xml(document);
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result = true;
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}catch(Exception e){
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throw new RuntimeException(e);
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}
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return result;
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}
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@Override
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public boolean deleteStudent(String name) {
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boolean result = false;
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try{
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//得到Document
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Document document = Dom4JUtil.getDocument();
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//选择所有的name元素
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List<Node> nodes = document.selectNodes("//name");
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//遍历：判断元素的内容是否与参数一致
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for(Node n:nodes){
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if(n.getText().equals(name))
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//用他的爷爷删除它的爸爸
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n.getParent().getParent().remove(n.getParent());
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}
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//写回XML文档
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Dom4JUtil.write2xml(document);
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result = true;
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}catch(Exception e){
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throw new RuntimeException(e);
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}
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return result;
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}
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@Override
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public Student findStudent(String examid) {
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Student s = null;
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try{
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Document document = Dom4JUtil.getDocument();
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Node node = document.selectSingleNode("//student[@examid='"+examid+"']");
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if(node!=null){
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Element e = (Element)node;
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s = new Student();
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s.setExamid(examid);
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s.setIdcard(e.valueOf("@idcard"));
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s.setName(e.element("name").getText());
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s.setLocation(e.elementText("location"));
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s.setGrade(Float.parseFloat(e.elementText("grade")));
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}
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}catch(Exception e){
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throw new RuntimeException(e);
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}
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return s;
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}
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}

‎day02_exam/src/cn/itcast/domain/Student.java‎

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package cn.itcast.domain;
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public class Student {
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private String idcard;
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private String examid;
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private String name;
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private String location;
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private float grade;
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public String getIdcard() {
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return idcard;
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}
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public void setIdcard(String idcard) {
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this.idcard = idcard;
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}
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public String getExamid() {
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return examid;
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}
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public void setExamid(String examid) {
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this.examid = examid;
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}
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public String getName() {
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return name;
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}
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public void setName(String name) {
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this.name = name;
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}
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public String getLocation() {
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return location;
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}
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public void setLocation(String location) {
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this.location = location;
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}
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public float getGrade() {
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return grade;
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}
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public void setGrade(float grade) {
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this.grade = grade;
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}
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@Override
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public String toString() {
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return "Student [examid=" + examid + ", grade=" + grade + ", idcard="
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+ idcard + ", location=" + location + ", name=" + name + "]";
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}
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}

‎day02_exam/src/cn/itcast/test/StudentDaoTest.java‎

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package cn.itcast.test;
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import cn.itcast.dao.IStudentDao;
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import cn.itcast.dao.StudentDao;
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public class StudentDaoTest {
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public static void main(String[] args) {
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IStudentDao dao = new StudentDao();
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//
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// Student s = new Student();
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// s.setIdcard("555");
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// s.setExamid("666");
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// s.setName("Àî×ÚÈð");
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// s.setLocation("̨±±");
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// s.setGrade(100);
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//
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// dao.createStudent(s);
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// Student s = dao.findStudent("666");
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// System.out.println(s);
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boolean b = dao.deleteStudent("Àî×ÚÈð");
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System.out.println(b);
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}
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}

‎day02_exam/src/cn/itcast/test/StudentDom4JDaoTest.java‎

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package cn.itcast.test;
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import cn.itcast.dao.IStudentDao;
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import cn.itcast.dao.StudentDom4JDao;
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import cn.itcast.domain.Student;
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import junit.framework.Assert;
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import org.junit.AfterClass;
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import org.junit.BeforeClass;
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import org.junit.Test;
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public class StudentDom4JDaoTest {
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private static IStudentDao dao;
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@BeforeClass
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public static void init(){
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dao = new StudentDom4JDao();
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}
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@AfterClass
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public static void destory(){
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dao = null;
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}
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@Test
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public void testCreateStudent() {
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Student s = new Student();
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s.setExamid("438");
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s.setIdcard("250");
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s.setName("ÕŰ׳Õ");
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s.setLocation("ÈÕ±¾");
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s.setGrade(100);
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boolean b = dao.createStudent(s);
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Assert.assertTrue(b);
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}
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@Test
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public void testFindStudent() {
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Student s = dao.findStudent("438");
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Assert.assertNotNull(s);
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s = dao.findStudent("834");
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Assert.assertNull(s);
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}
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@Test
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public void testDeleteStudent() {
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boolean b = dao.deleteStudent("ÕŰ׳Õ");
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Assert.assertTrue(b);
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}
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}

‎day02_exam/src/cn/itcast/util/DocumentUtil.java‎

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package cn.itcast.util;
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import javax.xml.parsers.DocumentBuilder;
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import javax.xml.parsers.DocumentBuilderFactory;
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import javax.xml.transform.Transformer;
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import javax.xml.transform.TransformerFactory;
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import javax.xml.transform.dom.DOMSource;
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import javax.xml.transform.stream.StreamResult;
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import org.w3c.dom.Document;
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//操作XML的工具类
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//工具类中的异常可以抛也可以处理
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public class DocumentUtil {
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public static Document getDocument() throws Exception{
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DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
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return builder.parse("src/exam.xml");
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}
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public static void write2xml(Document document)throws Exception{
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Transformer ts = TransformerFactory.newInstance().newTransformer();
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ts.transform(new DOMSource(document), new StreamResult("src/exam.xml"));
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}
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}

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