学生信息管理系统（Socket编程 XML读写操作）

package com.Server; import java.io.File; import java.io.IOException; import java.util.ArrayList; import java.util.List; import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.parsers.ParserConfigurationException; import javax.xml.transform.OutputKeys; import javax.xml.transform.Transformer; import javax.xml.transform.TransformerConfigurationException; import javax.xml.transform.TransformerException; import javax.xml.transform.TransformerFactory; import javax.xml.transform.dom.DOMSource; import javax.xml.transform.stream.StreamResult; import org.w3c.dom.Document; import org.w3c.dom.Element; import org.w3c.dom.Node; import org.w3c.dom.NodeList; import org.xml.sax.SAXException; import com.entity.Student; import com.entity.Teacher; import com.util.Datas; import com.util.SysConstants; public class ServerService { /** * 教师登录 * @param loginId 用户名 * @param loginPwd 密码 * @return */ public Datas login(String loginId, String loginPwd) { Datas datas = new Datas(); // 得到Teacher.xml的DOM树 Document doc = getDocument("src/Teacher.xml"); NodeList teaList = doc.getElementsByTagName("Teacher"); for (int i = 0; i < teaList.getLength(); i++) { Element elTea = (Element) teaList.item(i); String name = elTea.getElementsByTagName("loginId").item(0) .getTextContent(); String pwd = elTea.getElementsByTagName("loginPwd").item(0) .getTextContent(); if (loginId.equals(name) && loginPwd.equals(pwd)) { Teacher teacher = new Teacher(); teacher.setLoginId(loginId); teacher.setLoginPwd(loginPwd); datas.setTeacher(teacher); datas.setFlag(SysConstants.SUCCESS); return datas; } } datas.setFlag(SysConstants.ERROR); return datas; } /** * 得到DOM树 * @param path 需要解析的XML文档 * @return */ private Document getDocument(String path) { try { // 获得DOM解析器工厂实例 DocumentBuilderFactory factory = DocumentBuilderFactory .newInstance(); // 得到DOM解析器 DocumentBuilder builder = factory.newDocumentBuilder(); // 解析xml文件得到DOM树 Document doc = builder.parse(path); return doc; } catch (ParserConfigurationException e) { e.printStackTrace(); } catch (SAXException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return null; } /** * 查找所有的学员信息 * @return */ public Datas findAll() { Datas datas = new Datas(); List<Student> list = new ArrayList<Student>(); // 得到Student.xml的DOM树 Document doc = getDocument("src/Student.xml"); NodeList stuList = doc.getElementsByTagName("student"); for (int i = 0; i < stuList.getLength(); i++) { Element elStu = (Element) stuList.item(i); String stuid = elStu.getElementsByTagName("stuid").item(0) .getTextContent(); String stuName = elStu.getElementsByTagName("stuName").item(0) .getTextContent(); String age = elStu.getElementsByTagName("Age").item(0) .getTextContent(); String gender = elStu.getElementsByTagName("Gender").item(0) .getTextContent(); String teaid = elStu.getElementsByTagName("teaid").item(0) .getTextContent(); String comment = elStu.getElementsByTagName("comment").item(0) .getTextContent(); Student student = new Student(); student.setStuId(Integer.parseInt(stuid)); student.setStuName(stuName); student.setAge(Integer.parseInt(age)); student.setGender(gender); student.setTeaId(Integer.parseInt(teaid)); student.setComment(comment); list.add(student); } if (list.size() > 0) { datas.setStuList(list); datas.setFlag(SysConstants.SUCCESS); } else { datas.setFlag(SysConstants.ERROR); } return datas; } /** * 根据教师编号 查找 教师名称 * @param teaid 教师编号 * @return */ public Datas findTeaName(int teaid) { Datas datas = new Datas(); // 得到Teacher.xml的DOM树 Document doc = getDocument("src/Teacher.xml"); NodeList teaList = doc.getElementsByTagName("Teacher"); for (int i = 0; i < teaList.getLength(); i++) { Element elTea = (Element) teaList.item(i); String id = elTea.getElementsByTagName("teaid").item(0) .getTextContent(); if (teaid == Integer.parseInt(id)) { Teacher teacher = new Teacher(); String teaName = elTea.getElementsByTagName("teaName").item(0) .getTextContent(); teacher.setTeaName(teaName); datas.setTeacher(teacher); datas.setFlag(SysConstants.SUCCESS); return datas; } } datas.setFlag(SysConstants.ERROR); return datas; } /** * 删除学员信息方法 * @param id 学员ID */ public Datas delStudent(int stuid){ Datas datas = new Datas(); Document doc=getDocument("src/Student.xml"); Node students=doc.getElementsByTagName("Students").item(0); NodeList list = doc.getElementsByTagName("student"); for (int i = 0; i < list.getLength(); i++) { Element element = (Element) list.item(i); String id = element.getElementsByTagName("stuid").item(0).getTextContent(); if(stuid == Integer.parseInt(id)){ students.removeChild(element); writeXml(doc); datas.setFlag(SysConstants.SUCCESS); return datas; } } datas.setFlag(SysConstants.ERROR); return datas; } /** * 修改学员信息方法 * @param student 学员对象 */ public Datas modifyStudent(int stuid,String comment){ Datas datas = new Datas(); Document doc=getDocument("src/Student.xml"); NodeList list = doc.getElementsByTagName("student"); for (int i = 0; i < list.getLength(); i++) { Element element = (Element) list.item(i); String id = element.getElementsByTagName("stuid").item(0).getTextContent(); if(stuid == Integer.parseInt(id)){ //element.setAttribute("comment", comment); Element commentElement = (Element) element.getElementsByTagName("comment").item(0); commentElement.setTextContent(comment); writeXml(doc); datas.setFlag(SysConstants.SUCCESS); return datas; } } datas.setFlag(SysConstants.ERROR); return datas; } /** * 修改后的内容写入XML * @param docs */ public void writeXml(Document doc) { try { TransformerFactory factory=TransformerFactory.newInstance(); Transformer transformer=factory.newTransformer(); DOMSource domSoure=new DOMSource(doc); //设置编码类型 transformer.setOutputProperty(OutputKeys.ENCODING, "utf-8"); StreamResult result=new StreamResult(new File("src/Student.xml")); transformer.transform(domSoure, result); } catch (TransformerConfigurationException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (TransformerException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }