javascript
java中document解析jsp,JSP基于dom解析xml实例详解
本文實例講述了JSP基于dom解析xml的方法。分享給大家供大家參考，具體如下：
初次學習用dom操作xml文件，有很多不足之處，牛人多給點建議，練習時我沒對中文做亂碼處理，也沒做驗證哦！O(∩_∩)O~
實體類：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;
}
}
數據訪問層接口：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);
}
接口實現類：UserDaoImpl
public class UserDaoImpl implements UserDao {
private static final String PATH="xml文件路徑";
private void build(Document dom) {
try {
//定義轉換器
Transformer f = TransformerFactory.newInstance().newTransformer();
//設置輸出的編碼格式
f.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
//構建dom源
DOMSource source = new DOMSource(dom);
//指定文件存放的目標路勁
StreamResult sr = new StreamResult(new File(PATH));
//執行轉換操作
f.transform(source, sr);
} catch (Exception e) {
e.printStackTrace();
}
}
//登陸
public boolean login(String name, String pwd) {
boolean flag = false;
try {
//根據以有的xml文件創建Document對象
Document dom = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(new File(PATH));
//獲取user節點下的子節點
NodeList list = dom.getElementsByTagName("user");
//遍歷list，數據匹配退出
for(int i = 0; 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 {
//創建全新的Document對象
Document dom = DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument();
//創建根節點users
Element el = dom.createElement("users");
//將根節點添加到dom中
dom.appendChild(el);
//創建子節點
Element e2 = dom.createElement("user");
//將子節點添加到根節點中
el.appendChild(e2);
//取得xml文件中現有的信息
List users = this.selectUser();
for(int i = 0; i < users.size(); i++){
//創建節點user
Element el3 = dom.createElement("user");
User us =users.get(i);
//設置節點的屬性(name,pwd,email)
el3.setAttribute("name", us.getName());
el3.setAttribute("pwd", us.getPwd());
el3.setAttribute("email", us.getEmail());
//添加到根節點中
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();
}
}
//查詢操作
public List selectUser() {
List userList = new ArrayList();
try {
//根據已有的xml文件創建dom
Document dom = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(new File(PATH));
//獲取所有user節點下的子節點
NodeList list = dom.getElementsByTagName("user");
for(int i = 0;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 {
//根據以有的xml文件創建dom
Document dom = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(new File(PATH));
//獲取user節點下的子節點
NodeList list = dom.getElementsByTagName("user");
//遍歷list
for(int i = 0;i < list.getLength();i++) {
Element el = (Element)list.item(i);
//根據name屬性去修改
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();
}
}
//刪除操作
public boolean deleteUser(String name) {
try {
//根據以有xml文件創建domcumet對象
Document dom = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(new File(PATH));
//獲取user節點下的子節點
NodeList list = dom.getElementsByTagName("user");
//遍歷list
for(int i=0;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;
}
//根據name查找
public User findByName(String name) {
User user = new User();
try {
//根據以后的xml文件創建document對象
Document dom = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(new File(PATH));
//獲取user節點下的子節點集合
NodeList list = dom.getElementsByTagName("user");
for(int i=0;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;
}
}
業務邏輯層接口：UserService
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);
接口實現類：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 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);
}
}
控制層：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 users = new ArrayList();
users = userService.selectUser();
request.setAttribute("USER", users);
return "select";
}
/**
* 登陸
* @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";
}
/**
* 編輯
* @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";
}
/**
* 刪除
* @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)：
/p>
"-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN"
"http://struts.apache.org/dtds/struts-2.1.7.dtd">
/list.jsp
/list.action
/login.jsp
/list.action
/list.action
/list.action
/update.jsp
web.xml配置
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">
index.jsp
struts2
org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
struts2
/*
四個頁面：login.jsp? list.jsp insert.jsp,update.jsp
login.jsp
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
My JSP 'login.jsp' starting page首頁|注冊
| 用戶名： | |
| 密碼： | |
list.jsp
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
My JSP 'list.jsp' starting page注冊
| 用戶列表 | |||||
| 序號 | 用戶名 | 密碼 | 郵箱 | 刪除 | 編輯 |
| ${temp.index+1} | ${u.name } | ${u.pwd } | ${u.email} | 刪除 | 編輯 |
insert.jsp
String path = request.getContextPath();
String basePath = request.getScheme() + "://"
+ request.getServerName() + ":" + request.getServerPort()
+ path + "/";
%>
My JSP 'register.jsp' starting page首頁
用戶名： | |
密碼： | |
郵箱： | |
update.jsp
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
My JSP 'update.jsp' starting page首頁
更新操作
| 用戶名： | |
| 密碼： | |
| 郵箱： | |
本人學習所用的user.xml文件
希望本文所述對大家jsp程序設計有所幫助。
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