通讯录改造——MVC设计模式

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

通讯录改造——MVC设计模式

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：

通讯录改造——MVC设计模式

当名字重复的时候：提交就会显示

通讯录改造——MVC设计模式

秒客网

通讯录改造——MVC设计模式

相关文章