JSP基于dom解析xml实例详解
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<User> 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<list.getLength(); i++) {
Element el = (Element)list.item(i);
if(name.equals(el.getAttribute(\"name\")) && pwd.equals(el.getAttribute(\"pwd\"))) {
flag = true;
break;
}
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return flag;
}
//添加操作
public void insertUser(User user) {
try {
//创建全新的Document对象
Document dom = DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument();
//创建根节点users
Element el = dom.createElement(\"users\");
//将根节点添加到dom中
dom.appendChild(el);
//创建子节点
Element e2 = dom.createElement(\"user\");
//将子节点添加到根节点中
el.appendChild(e2);
//取得xml文件中现有的信息
List<User> 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<User> selectUser() {
List<User> userList = new ArrayList<User>();
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 <list.getLength();i++){
User user =new User();
Element element = (Element)list.item(i);
user.setName(element.getAttribute(\"name\"));
user.setPwd(element.getAttribute(\"pwd\"));
user.setEmail(element.getAttribute(\"email\"));
userList.add(user);
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return userList;
}
//修改操作
public void updateUser(User user) {
try {
//根据以有的xml文件创建dom
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
for(int i = 0;i < list.getLength();i++) {
Element el = (Element)list.item(i);
//根据name属性去修改
if(user.getName().equals(el.getAttribute(\"name\"))) {
el.setAttribute(\"pwd\", user.getPwd());
el.setAttribute(\"email\", user.getEmail());
build(dom);
}
}
} catch (SAXException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ParserConfigurationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
//删除操作
public boolean deleteUser(String name) {
try {
//根据以有xml文件创建domcumet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
for(int i=0;i<list.getLength();i++) {
Element el = (Element)list.item(i);
if(name.equals(el.getAttribute(\"name\"))) {
el.getParentNode().removeChild(el);
build(dom);
return true;
}
}
} catch (Exception e) {
// TODO: handle exception
}
return false;
}
//根据name查找
public User findByName(String name) {
User user = new User();
try {
//根据以后的xml文件创建document对象
Document dom = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(new File(PATH));
//获取user节点下的子节点集合
NodeList list = dom.getElementsByTagName(\"user\");
for(int i=0;i<list.getLength();i++) {
Element el = (Element)list.item(i);
if(name.equals(el.getAttribute(\"name\"))) {
user.setName(el.getAttribute(\"name\"));
user.setPwd(el.getAttribute(\"pwd\"));
user.setEmail(el.getAttribute(\"email\"));
break;
}
}
} catch (Exception e) {
e.printStackTrace();
}
return user;
}
}
业务逻辑层接口：UserService
boolean login(String name, String pwd); void insertUser(User user); List<User> selectUser(); void updateUser(User user); boolean deleteUser(String name); public User findByName(String name);
接口实现类：UserServiceImpl
public class UserServiceImpl implements UserService {
UserDao dao = new UserDaoImpl();
public boolean login(String name, String pwd) {
return dao.login(name, pwd);
}
public void insertUser(User user) {
dao.insertUser(user);
}
public List<User> selectUser() {
return dao.selectUser();
}
public void updateUser(User user) {
dao.updateUser(user);
}
public boolean deleteUser(String name) {
return dao.deleteUser(name);
}
public User findByName(String name) {
return dao.findByName(name);
}
}
控制层：UserAction
public class UserAction extends ActionSupport{
private User user;
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
UserService userService = new UserServiceImpl();
public String selectUser(){
HttpServletRequest request = ServletActionContext.getRequest();
List<User> users = new ArrayList<User>();
users = userService.selectUser();
request.setAttribute(\"USER\", users);
return \"select\";
}
/**
* 登陆
* @return
*/
public String login(){
if(user.getName() != null && user.getPwd() != null) {
boolean flag = userService.login(user.getName(), user.getPwd());
if(flag) {
return SUCCESS;
}
}
return ERROR;
}
/**
* 修改
* @return
*/
public String update(){
userService.updateUser(user);
return \"update\";
}
/**
* 编辑
* @return
*/
public String edit(){
HttpServletRequest request = ServletActionContext.getRequest();
String name = request.getParameter(\"uName\");
if(name != null) {
User u = userService.findByName(name);
request.setAttribute(\"USER\", u);
}
return \"edit\";
}
/**
* 删除
* @return
*/
public String delete(){
HttpServletRequest request = ServletActionContext.getRequest();
String name = request.getParameter(\"uName\");
boolean flag = userService.deleteUser(name);
System.out.println(flag);
return SUCCESS;
}
/**
* 添加
* @return
*/
public String insert(){
userService.insertUser(user);
return \"insert\";
}
}
struts.xml配置（本人用的的struts2）：
<?xml version=\"1.0\" encoding=\"UTF-8\" ?>
<!DOCTYPE struts PUBLIC
\"-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN\"
\"http://struts.apache.org/dtds/struts-2.1.7.dtd\">
<struts>
<package name=\"file\" extends=\"struts-default\">
<action name=\"list\" class=\"com.jun.action.UserAction\" method=\"selectUser\">
<result name=\"select\">/list.jsp</result>
</action>
<action name=\"login\" class=\"com.jun.action.UserAction\" method=\"login\">
<result name=\"success\" type=\"redirectAction\">/list.action</result>
<result name=\"error\">/login.jsp</result>
</action>
<action name=\"insert\" class=\"com.jun.action.UserAction\" method=\"insert\">
<result name=\"insert\" type=\"redirectAction\">/list.action</result>
</action>
<action name=\"delete\" class=\"com.jun.action.UserAction\" method=\"delete\">
<result type=\"redirect\">/list.action</result>
</action>
<action name=\"update\" class=\"com.jun.action.UserAction\" method=\"update\">
<result name=\"update\" type=\"redirectAction\">/list.action</result>
</action>
<action name=\"edit\" class=\"com.jun.action.UserAction\" method=\"edit\">
<result name=\"edit\">/update.jsp</result>
</action>
</package>
</struts>
web.xml配置
<?xml version=\"1.0\" encoding=\"UTF-8\"?> <web-app version=\"2.5\" xmlns=\"http://java.sun.com/xml/ns/javaee\" xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance\" xsi:schemaLocation=\"http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd\"> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <filter> <filter-name>struts2</filter-name> <filter-class> org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter </filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
四个页面：login.jsp list.jsp insert.jsp,update.jsp
login.jsp
<%@ page language=\"java\" import=\"java.util.*\" pageEncoding=\"GBK\"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+\"://\"+request.getServerName()+\":\"+request.getServerPort()+path+\"/\";
%>
<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">
<html>
<head>
<base href=\"<%=basePath%>\">
<title>My JSP \'login.jsp\' starting page</title>
<meta http-equiv=\"pragma\" content=\"no-cache\">
<meta http-equiv=\"cache-control\" content=\"no-cache\">
<meta http-equiv=\"expires\" content=\"0\">
<meta http-equiv=\"keywords\" content=\"keyword1,keyword2,keyword3\">
<meta http-equiv=\"description\" content=\"This is my page\">
<!--
<link rel=\"stylesheet\" type=\"text/css\" href=\"styles.css\">
-->
</head>
<body>
<a href=\"list.action\">首页</a>|<a href=\"insert.jsp\">注册</a>
<form action=\"login.action\" method=\"post\">
<table>
<tr>
<td> 用户名：</td><td><input name=\"user.name\" type=\"text\"></td>
</tr>
<tr>
<td> 密码：</td><td><input type=\"password\" name=\"user.pwd\"></td>
</tr>
<tr>
<td colspan=\"2\" align=\"center\"><input type=\"submit\" value=\"登录\"></td>
</tr>
</table>
</form>
</body>
</html>
list.jsp
<%@ page language=\"java\" import=\"java.util.*\" pageEncoding=\"GBK\"%>
<%@ taglib uri=\"/struts-tags\" prefix=\"s\"%>
<%@ taglib uri=\"http://java.sun.com/jsp/jstl/core\" prefix=\"c\"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+\"://\"+request.getServerName()+\":\"+request.getServerPort()+path+\"/\";
%>
<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">
<html>
<head>
<base href=\"<%=basePath%>\">
<title>My JSP \'list.jsp\' starting page</title>
<meta http-equiv=\"pragma\" content=\"no-cache\">
<meta http-equiv=\"cache-control\" content=\"no-cache\">
<meta http-equiv=\"expires\" content=\"0\">
<meta http-equiv=\"keywords\" content=\"keyword1,keyword2,keyword3\">
<meta http-equiv=\"description\" content=\"This is my page\">
<!--
<link rel=\"stylesheet\" type=\"text/css\" href=\"styles.css\">
-->
</head>
<body >
<a href=\"insert.jsp\">注册</a>
<table border=\"1\">
<tr>
<td align=\"center\" colspan=\"6\"><font size=\"+3\">用户列表</font></td>
</tr>
<tr>
<td>序号</td><td>用户名</td><td>密码</td><td>邮箱</td><td>删除</td><td>编辑</td>
</tr>
<c:forEach items=\"${USER}\" var=\"u\" varStatus=\"temp\">
<tr>
<td>${temp.index+1}</td><td>${u.name }</td><td>${u.pwd }</td><td>${u.email}</td><td><a href=\"delete.action?uName=${u.name}\">删除</a></td><td><a href=\"edit.action?uName=${u.name }\">编辑</a></td>
</tr>
</c:forEach>
</table>
</body>
</html>
insert.jsp
<%@ page language=\"java\" import=\"java.util.*\" pageEncoding=\"GBK\"%> <% String path = request.getContextPath(); String basePath = request.getScheme() + \"://\" + request.getServerName() + \":\" + request.getServerPort() + path + \"/\"; %> <!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\"> <html> <head> <base href=\"<%=basePath%>\"> <title>My JSP \'register.jsp\' starting page</title> <meta http-equiv=\"pragma\" content=\"no-cache\"> <meta http-equiv=\"cache-control\" content=\"no-cache\"> <meta http-equiv=\"expires\" content=\"0\"> <meta http-equiv=\"keywords\" content=\"keyword1,keyword2,keyword3\"> <meta http-equiv=\"description\" content=\"This is my page\"> <!-- <link rel=\"stylesheet\" type=\"text/css\" href=\"styles.css\"> --> </head> <body> <a href=\"list.action\">首页</a> <form action=\"insert.action\" method=\"post\"> <table> <tr> <td> 用户名： </td> <td> <input name=\"user.name\" type=\"text\"> </td> </tr> <tr> <td> 密码： </td> <td> <input type=\"password\" name=\"user.pwd\"> </td> </tr> <tr> <td> 邮箱： </td> <td> <input type=\"text\" name=\"user.email\"> </td> </tr> <tr> <td colspan=\"2\" align=\"center\"> <input type=\"submit\" value=\"提交\"> </td> </tr> </table> </form> </body> </html>
update.jsp
<%@ page language=\"java\" import=\"java.util.*\" pageEncoding=\"GBK\"%>
<%@ taglib uri=\"http://java.sun.com/jsp/jstl/core\" prefix=\"c\" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+\"://\"+request.getServerName()+\":\"+request.getServerPort()+path+\"/\";
%>
<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">
<html>
<head>
<base href=\"<%=basePath%>\">
<title>My JSP \'update.jsp\' starting page</title>
<meta http-equiv=\"pragma\" content=\"no-cache\">
<meta http-equiv=\"cache-control\" content=\"no-cache\">
<meta http-equiv=\"expires\" content=\"0\">
<meta http-equiv=\"keywords\" content=\"keyword1,keyword2,keyword3\">
<meta http-equiv=\"description\" content=\"This is my page\">
<!--
<link rel=\"stylesheet\" type=\"text/css\" href=\"styles.css\">
-->
</head>
<body>
<a href=\"list.action\">首页</a>
<h2>更新操作</h2>
<form action=\"update.action\" method=\"post\">
<table>
<c:set value=\"${USER}\" var=\"user\"></c:set>
<tr>
<td> 用户名：</td><td><input readonly=\"readonly\" name=\"user.name\" value=\"${user.name}\" type=\"text\"></td>
</tr>
<tr>
<td> 密码：</td><td><input type=\"password\" value=\"${user.pwd }\" name=\"user.pwd\"></td>
</tr>
<tr>
<td> 邮箱：</td><td><input type=\"text\" value=\"${user.email }\" name=\"user.email\"></td>
</tr>
<tr>
<td colspan=\"2\" align=\"center\"><input type=\"submit\" value=\"保存\"></td>
</tr>
</table>
</form>
</body>
</html>
本人学习所用的user.xml文件
<?xml version=\"1.0\" encoding=\"UTF-8\"?> <users> <user email=aaa@sina.com name=\"bbb\" pwd=\"aaaaaa\"/> <user email=bbb@sina.com name=\"ccc\" pwd=\"aaaaaa\"/> </users>
希望本文所述对大家jsp程序设计有所帮助。
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