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通讯录改造——MVC设计模式
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内容图文
将之前用servlet写的程序转化为jsp+servlet的简单的MVC的三层结构。项目中程序的包如图
首先是实体对象：
package com.contactSystem.entiey;
public class Contact {
private String Id;
private String name;
private String sex;
private String age;
private String phone;
private String qq;
private String email;
public String getId() {
return Id;
}
public void setId(String id) {
Id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public String getQq() {
return qq;
}
public void setQq(String qq) {
this.qq = qq;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
@Override
public String toString() {
return "Contact [Id=" + Id + ", name=" + name + ", sex=" + sex
+ ", age=" + age + ", phone=" + phone + ", qq=" + qq
+ ", email=" + email + "]";
}
}
然后就是对数据操作的抽象类
package com.contactSystem.dao;
import java.io.FileNotFoundException;
import java.io.UnsupportedEncodingException;
import java.util.List;
import org.dom4j.DocumentException;
import com.contactSystem.entiey.Contact;
public interface ContactOperate {
public void addContact(Contact contact) throws Exception;
public void updateContact(Contact contact) throws Exception;
public void removeContact(String id) throws Exception;
public Contact findContact(String id) throws Exception;
public List<Contact> allContacts();
//根据名称姓名查询是否有存在重复。
public boolean checkIfContact(String name);
}
具体实现类
package com.contactSystem.dao.daoImpl;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
import javax.persistence.Id;
import javax.persistence.Tuple;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import com.contactSystem.dao.ContactOperate;
import com.contactSystem.entiey.Contact;
import com.contactSystem.util.XMLUtil;
public class Operater implements ContactOperate {
@Override
//添加联系人
public void addContact(Contact contact) throws Exception {
// TODO Auto-generated method stub
File file=new File("e:/contact.xml");
Document doc=null;
Element rootElem=null;
if (file.exists()) {
doc=new SAXReader().read(file);
rootElem=doc.getRootElement();
}else {
doc=DocumentHelper.createDocument();
rootElem=doc.addElement("ContactList");
}
//开始添加个体
Element element=rootElem.addElement("contact");
//有系统自动生成一随机且唯一的ID，赋给联系人Id，系统提供了一个包UUID包
String uuid=UUID.randomUUID().toString().replace("-", "");
element.addAttribute("Id", uuid);
element.addElement("姓名").setText(contact.getName());
element.addElement("name").setText(contact.getName());
element.addElement("sex").setText(contact.getSex());
element.addElement("age").setText(contact.getAge());
element.addElement("phone").setText(contact.getPhone());
element.addElement("email").setText(contact.getEmail());
element.addElement("qq").setText(contact.getQq());
//写入到本地的xml文档中
XMLUtil.write2xml(doc);
}
@Override
public void updateContact(Contact contact) throws Exception {
// TODO Auto-generated method stub
//通过xpath查找对应id的联系人
Document document=XMLUtil.getDocument();
Element element=(Element) document.selectSingleNode("//contact[@Id=‘"+contact.getId()+"‘]");
//根据标签改文本
System.out.println(element);
element.element("name").setText(contact.getName());
element.element("age").setText(contact.getAge());
element.element("email").setText(contact.getEmail());
element.element("phone").setText(contact.getPhone());
element.element("sex").setText(contact.getSex());
element.element("qq").setText(contact.getQq());
XMLUtil.write2xml(document);
}
@Override
public void removeContact(String id) throws Exception {
// TODO Auto-generated method stub
//通过xpath去查找对应的contact
Document document=XMLUtil.getDocument();
Element element=(Element) document.selectSingleNode("//contact[@Id=‘"+id+"‘]");
/**
* 如果是火狐浏览器，其本身有一个bug，对于一个get请求，它会重复做两次，
* 第一次会把一个唯一的id给删除掉，但是在第二次的时候，它会继续去删，而这个时候查找不到，会报错，会发生错误，
* 为了解决这个bug，我们在这里验证其是否为空
*/
if (element!=null) {
element.detach();
XMLUtil.write2xml(document);
}
}
@Override
public Contact findContact(String id) throws Exception {
// TODO Auto-generated method stub
Document document=XMLUtil.getDocument();
Element e=(Element) document.selectSingleNode("//contact[@Id=‘"+id+"‘]");
Contact contact=null;
if (e!=null) {
contact=new Contact();
contact.setAge(e.elementText("age"));
contact.setEmail(e.elementText("email"));
contact.setId(id);
contact.setName(e.elementText("name"));
contact.setPhone(e.elementText("phone"));
contact.setSex(e.elementText("sex"));
contact.setQq(e.elementText("qq"));
}
return contact;
}
@Override
public List<Contact> allContacts() {
// TODO Auto-generated method stub
Document document=XMLUtil.getDocument();
List<Contact> list=new ArrayList<Contact>();
List<Element> conElements=(List<Element>)document.selectNodes("//contact");
for (Element element : conElements) {
Contact contact=new Contact();
contact.setId(element.attributeValue("Id"));
contact.setAge(element.elementText("age"));
contact.setEmail(element.elementText("email"));
contact.setName(element.elementText("name"));
contact.setPhone(element.elementText("phone"));
contact.setQq(element.elementText("qq"));
contact.setSex(element.elementText("sex"));
list.add(contact);
}
return list;
}
/**
* true:说明重复
* false：说明没有重复
*/
@Override
public boolean checkIfContact(String name) {
// TODO Auto-generated method stub
//查询name标签是否一样
Document doc=XMLUtil.getDocument();
Element element=(Element) doc.selectSingleNode("//name[text()=‘"+name+"‘]");
if (element!=null) {
return true;
}else {
return false;
}
}
}
为了减轻Servlet的负担在增加一层（业务逻辑层）Service，这里举例，当联系人的名字存在时，提示出错，不在servlet中去判断，而在service中去处理，同样首先写出service抽象接口
package com.contactSystem.service;
import java.util.List;
import com.contactSystem.entiey.Contact;
public interface ContactService {
public void addContact(Contact contact) throws Exception;
public void updateContact(Contact contact) throws Exception;
public void removeContact(String id) throws Exception;
public Contact findContact(String id) throws Exception;
public List<Contact> allContacts();
}
这个时候有点相当于在Operate操作中添加了一层操作，在contactService的实现类中去有逻辑判断的去使用Operater的方法
package com.contactSystem.service.imple;
import java.util.List;
import com.contactSystem.dao.daoImpl.Operater;
import com.contactSystem.entiey.Contact;
import com.contactSystem.exception.NameRepeatException;
import com.contactSystem.service.ContactService;
/**
* 处理项目中出现的业务逻辑
* @author Administrator
*
*/
public class ContactServiceImpe implements ContactService {
Operater operater =new Operater();
@Override
public void addContact(Contact contact) throws Exception {
// TODO Auto-generated method stub
//执行业务逻辑判断
/**
* 添加是否重复的业务逻辑
*/
if (operater.checkIfContact(contact.getName())) {
//重复
/**
* 注意：如果业务层方法出现任何错误，则返回标记（自定义的异常）到servlet
*/
throw new NameRepeatException("姓名重复，不可使用");
}
operater.addContact(contact);
}
@Override
public void updateContact(Contact contact) throws Exception {
// TODO Auto-generated method stub
operater.updateContact(contact);
}
@Override
public void removeContact(String id) throws Exception {
// TODO Auto-generated method stub
operater.removeContact(id);
}
@Override
public Contact findContact(String id) throws Exception {
// TODO Auto-generated method stub
return operater.findContact(id);
}
@Override
public List<Contact> allContacts() {
// TODO Auto-generated method stub
return operater.allContacts();
}
}
这里通过抛出异常去将信息传递给Servlet，异常代码如下
package com.contactSystem.exception;
/**
* 姓名重复的自定义异常
* @author Administrator
*
*/
public class NameRepeatException extends Exception{
public NameRepeatException(String msg) {
super(msg);
}
}
现在来写Servlet，首先是首页的联系人列表Servlet
package com.contactSystem.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.contactSystem.dao.daoImpl.Operater;
import com.contactSystem.entiey.Contact;
import com.contactSystem.service.ContactService;
import com.contactSystem.service.imple.ContactServiceImpe;
public class Index extends HttpServlet {
/**
* 显示所有联系人的逻辑方式
*/
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
ContactService service=new ContactServiceImpe();
List<Contact> contacts=service.allContacts();
/**
* shift+alt+A ——>区域选择
* 正则表达式：“."表示任意字符，"*"表示多个字符
* “/1”表示一行代表匹配一行内容
*/
request.setAttribute("contacts", contacts);
request.getRequestDispatcher("/index.jsp").forward(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doGet(request, response);
}
}
添加联系人
package com.contactSystem.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.contactSystem.dao.daoImpl.Operater;
import com.contactSystem.entiey.Contact;
import com.contactSystem.exception.NameRepeatException;
import com.contactSystem.service.ContactService;
import com.contactSystem.service.imple.ContactServiceImpe;
public class addServlet extends HttpServlet {
/**
* 处理添加联系人的逻辑
*/
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
String userName=request.getParameter("userName");
String age=request.getParameter("age");
String sex=request.getParameter("sex");
String phone=request.getParameter("phone");
String qq=request.getParameter("qq");
String email=request.getParameter("email");
ContactService service=new ContactServiceImpe();
Contact contact=new Contact();
contact.setName(userName);
contact.setAge(age);
contact.setSex(sex);
contact.setPhone(phone);
contact.setQq(qq);
contact.setEmail(email);
try {
service.addContact(contact);
} catch (NameRepeatException e) {
// TODO Auto-generated catch block
//处理名字重复的异常
request.setAttribute("message", e.getMessage());
request.getRequestDispatcher("/add.jsp").forward(request, response);
return;
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
response.sendRedirect(request.getContextPath()+"/Index");
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doGet(request, response);
}
}
查找联系人
package com.contactSystem.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.contactSystem.dao.daoImpl.Operater;
import com.contactSystem.entiey.Contact;
import com.contactSystem.service.ContactService;
import com.contactSystem.service.imple.ContactServiceImpe;
public class FindIdServlet extends HttpServlet {
/**
* 修改联系人逻辑
*/
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
ContactService service=new ContactServiceImpe();
String id=request.getParameter("id");
Contact contact=null;
try {
contact=service.findContact(id);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
request.setAttribute("contact", contact);
request.getRequestDispatcher("/update.jsp").forward(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doGet(request, response);
}
}
修改联系人
package com.contactSystem.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.contactSystem.dao.daoImpl.Operater;
import com.contactSystem.entiey.Contact;
import com.contactSystem.service.ContactService;
import com.contactSystem.service.imple.ContactServiceImpe;
public class UpdateServlet extends HttpServlet {
/**
* 将修改后的数据提交
*/
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
request.setCharacterEncoding("utf-8");
String userName=request.getParameter("userName");
String age=request.getParameter("age");
String sex=request.getParameter("sex");
String phone=request.getParameter("phone");
String qq=request.getParameter("qq");
String email=request.getParameter("email");
String id=request.getParameter("id");
ContactService service=new ContactServiceImpe();
Contact contact=new Contact();
contact.setId(id);
contact.setName(userName);
contact.setAge(age);
contact.setSex(sex);
contact.setPhone(phone);
contact.setQq(qq);
contact.setEmail(email);
try {
service.updateContact(contact);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
response.sendRedirect(request.getContextPath()+"/Index");
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doGet(request, response);
}
}
删除联系人
package com.contactSystem.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.contactSystem.dao.daoImpl.Operater;
import com.contactSystem.service.ContactService;
import com.contactSystem.service.imple.ContactServiceImpe;
public class DeleteServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=utf-8");
String id=request.getParameter("id");
ContactService service=new ContactServiceImpe();
try {
service.removeContact(id);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
response.sendRedirect(request.getContextPath()+"/Index");
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doGet(request, response);
}
}
以上完成了MVC的M和C，还差View，现在来具体显示jsp页面
首页所有联系人的显示
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html>
<html>
<head>
<meta charset=‘utf-8‘>
<title>查询所有联系人</title>
<style media=‘screen‘>
table td {
text-align: center;
}
table {
border-collapse: collapse;
}
</style>
</head>
<body>
<center>
<h2>查询所有联系人</h2>
</center>
<table border=‘1‘ align=‘center‘>
<tbody>
<thead>
<th>编号</th>
<th>姓名</th>
<th>性别</th>
<th>年龄</th>
<th>电话</th>
<th>QQ</th>
<th>邮箱</th>
<th>操作</th>
</thead>
<c:forEach items="${contacts}" var="con" varStatus="varSta">
<tr>
<td>${varSta.count }</td>
<td>${con.name }</td>
<td>${con.sex }</td>
<td>${con.age }</td>
<td>${con.phone }</td>
<td>${con.qq }</td>
<td>${con.email }</td>
<td><a href=‘${pageContext.request.contextPath }/FindIdServlet?id=${con.id}‘>修改</a> <a href=‘${pageContext.request.contextPath }/DeleteServlet?id=${con.id}‘>删除</a></td>
</tr>
</c:forEach>
<tr>
<td colspan=‘8‘>
<a href=‘${pageContext.request.contextPath}/add.jsp‘>添加联系人</a>
</td>
</tr>
</tbody>
</table>
</body>
</html>
修改联系人，首先要把要修改联系人的信息都显示在信息栏中，然后用户去修改相关信息
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>修改联系人</title>
<style media="screen">
#btn{
width:40px;
width: 50px;
background: green;
color: white;
font-size:14px;
}
</style>
</head>
<body>
<center>
<h2>修改联系人</h2>
</center>
<form action="${pageContext.request.contextPath }/UpdateServlet" method="post">
<table border="1" align="center">
<tbody>
<tr>
<th>姓名</th>
<td><input type="text" name="userName" value="${contact.name}"/></td>
<input type="hidden" name="id" value="${contact.id }"/>
</tr>
<tr>
<th>年龄</th>
<td><input type="text" name="age" value="${contact.age }" /></td>
</tr>
<tr>
<th>性别</th>
<td>
<input type="radio" name="sex" value="男" <c:if test="${contact.sex==‘男‘ }"> checked="true"</c:if>/>男
<input type="radio" name="sex" value="女" <c:if test="${contact.sex==‘女‘ }"> checked="true"</c:if> />女
</td>
</tr>
<tr>
<th>电话</th>
<td><input type="text" name="phone" value="${contact.phone }" /></td>
</tr>
<tr>
<th>QQ</th>
<td><input type="text" name="qq" value="${contact.qq }" /></td>
</tr>
<tr>
<th>邮箱</th>
<td><input type="text" name="email" value="${contact.email }" /></td>
</tr>
<tr>
<td colspan="3" align="center">
<input type="submit" value="提交" id="btn"/>
</td>
</tr>
</tbody>
</table>
</form>
</body>
</html>
最后就是添加联系人了
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>添加联系人</title>
<style media="screen">
#btn{
width:40px;
width: 50px;
background: green;
color: white;
font-size:14px;
}
</style>
</head>
<body>
<center>
<h2>添加联系人</h2>
</center>
<form action="${pageContext.request.contextPath}/addServlet" method="post">
<table border="1" align="center">
<tbody>
<tr>
<th>姓名</th>
<td><input type="text" name="userName" value="${message }" /></td>
</tr>
<tr>
<th>年龄</th>
<td><input type="text" name="age" /></td>
</tr>
<tr>
<th>性别</th>
<td>
<input type="radio" name="sex" value="男"/>男
<input type="radio" name="sex" value="女" />女
</td>
</tr>
<tr>
<th>电话</th>
<td><input type="text" name="phone" /></td>
</tr>
<tr>
<th>QQ</th>
<td><input type="text" name="qq" /></td>
</tr>
<tr>
<th>邮箱</th>
<td><input type="text" name="email" /></td>
</tr>
<tr>
<td colspan="3" align="center">
<input type="submit" value="提交" id="btn"/>
</td>
</tr>
</tbody>
</table>
</form>
</body>
</html>
最后可以加上一个测试类，方便自己调试
package com.contactSystem.Junit;
import static org.junit.Assert.*;
import java.util.List;
import org.junit.Before;
import com.contactSystem.dao.daoImpl.Operater;
import com.contactSystem.entiey.Contact;
public class Test {
Operater operator=null;
//初始化这个对象的实例
@Before
public void init(){
operator=new Operater();
}
@org.junit.Test
public void Add() throws Exception{
Contact contact=new Contact();
contact.setAge("21");
contact.setEmail("454444@qq.com");
contact.setName("gqxing");
contact.setPhone("13455555");
contact.setQq("235346662");
contact.setSex("男");
operator.addContact(contact);
}
@org.junit.Test
public void update() throws Exception{
Contact contact=new Contact();
contact.setId("002");
contact.setAge("0");
contact.setEmail("0000000@qq.com");
contact.setName("test");
contact.setPhone("0-00000000000");
contact.setQq("000000000000");
contact.setSex("男");
operator.updateContact(contact);
}
@org.junit.Test
public void removeContact() throws Exception{
operator.removeContact("002");
}
@org.junit.Test
public void findContact() throws Exception{
Contact contact=operator.findContact("002");
System.out.println(contact);
}
@org.junit.Test
public void allContact() throws Exception{
List<Contact> contacts= operator.allContacts();
for (Contact contact : contacts) {
System.out.println(contact);
}
}
@org.junit.Test
public void TetsCheckBoolean() throws Exception{
Boolean flag=operator.checkIfContact("郭庆兴");
System.out.println(flag);
}
}
最后运行的结构示意图：
当名字重复的时候：提交就会显示
原文：http://www.cnblogs.com/helloworldcode/p/6067533.html
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