JSP基于dom解析xml实例详解
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2023-12-24 17:08:45
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...
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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