XML解析 JSP基于dom解析xml实例详解(1/5)

本文实例讲述了JSP基于dom解析xml的方法。分享给大家供大家参考，具体如下：

初次学习用dom操作xml文件，有很多不足之处，牛人多给点建议，练习时我没对中文做乱码处理，也没做验证哦！O(∩_∩)O~

实体类：User

public class User {
 private String name;
 private String pwd;
 private String email;
 public String getName() {
 return name;
 }
 public void setName(String name) {
 this.name = name;
 }
 public String getPwd() {
 return pwd;
 }
 public void setPwd(String pwd) {
 this.pwd = pwd;
 }
 public String getEmail() {
 return email;
 }
 public void setEmail(String email) {
 this.email = email;
 }
}

数据访问层接口：UserDao

public interface UserDao {
 boolean login(String name, String pwd);
 void insertUser(User user);
 List selectUser();
 void updateUser(User user);
 boolean deleteUser(String name);
 public User findByName(String name);
}

接口实现类：UserDaoImpl

public class UserDaoImpl implements UserDao {
 private static final String PATH="xml文件路径";
 private void build(Document dom) {
 try {
  //定义转换器
  Transformer f = TransformerFactory.newInstance().newTransformer();
  //设置输出的编码格式
  f.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
  //构建dom源
  DOMSource source = new DOMSource(dom);
  //指定文件存放的目标路劲
  StreamResult sr = new StreamResult(new File(PATH));
  //执行转换操作
  f.transform(source, sr);
 } catch (Exception e) {
  e.printStackTrace();
 }
 }
 //登陆
 public boolean login(String name, String pwd) {
 boolean flag = false;
 try {
  //根据以有的xml文件创建Document对象
  Document dom = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(new File(PATH));
  //获取user节点下的子节点
  NodeList list = dom.getElementsByTagName("user");
  //遍历list，数据匹配退出
  for(int i = 0; i users = this.selectUser();
  for(int i = 0; i < users.size(); i++){
  //创建节点user
  Element el3 = dom.createElement("user");
  User us =users.get(i);
  //设置节点的属性（name,pwd,email）
  el3.setAttribute("name", us.getName());
  el3.setAttribute("pwd", us.getPwd());
  el3.setAttribute("email", us.getEmail());
  //添加到根节点中
  el.appendChild(el3);
  }
  e2.setAttribute("name", user.getName());
  e2.setAttribute("pwd", user.getPwd());
  e2.setAttribute("email", user.getEmail());
  build(dom);
 } catch (ParserConfigurationException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
 }
 }
 //查询操作
 public List selectUser() {
 List userList = new ArrayList();
 try {
  //根据已有的xml文件创建dom
  Document dom = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(new File(PATH));
  //获取所有user节点下的子节点
  NodeList list = dom.getElementsByTagName("user");
  for(int i = 0;i 

业务逻辑层接口：UserService