首先画出分析图
实现效果如图
项目下的包如图：
实体包
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;}@Overridepublic String toString() {return "Contact [Id=" + Id + ", name=" + name + ", sex=" + sex+ ", age=" + age + ", phone=" + phone + ", qq=" + qq+ ", email=" + email + "]";}}
XML的工具包（只是避免了代码的重复使用，将其放进工具包中）
package com.contactSystem.util;import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.OutputStream;import javax.management.RuntimeErrorException;import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;/** xml操作的工具类*/
public class XMLUtil {//写出一个xml文件public static void write2xml(Document doc) throws Exception{OutputStream out=new FileOutputStream("e:/contact.xml");OutputFormat format=OutputFormat.createPrettyPrint();format.setEncoding("utf-8");XMLWriter writer=new XMLWriter(out,format);writer.write(doc);writer.close();}//读取本地xml文件的方法public static Document getDocument(){Document doc;try {doc = new SAXReader().read("e:/contact.xml");return doc;} catch (DocumentException e) {// TODO Auto-generated catch blocke.printStackTrace();throw new RuntimeException(e);}}}
抽象的接口
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();
}
具体的实现方法和操作
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 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 stubFile 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);}@Overridepublic 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);}@Overridepublic void removeContact(String id) throws Exception {// TODO Auto-generated method stub//通过xpath去查找对应的contactDocument 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);}}@Overridepublic Contact findContact(String id) throws Exception {// TODO Auto-generated method stubDocument 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(e.attributeValue("id"));contact.setName(e.elementText("name"));contact.setPhone(e.elementText("phone"));contact.setSex(e.elementText("sex"));contact.setQq(e.elementText("qq"));}return contact;}@Overridepublic List<Contact> allContacts() {// TODO Auto-generated method stubDocument 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;}}
添加联系人的html页面
<!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="/ContactWeb/addServlet" method="post"><table border="1" align="center"><tbody><tr><th>姓名</th><td><input type="text" name="userName" /></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>
接下来则是最重要的servlet（显示首页，所有联系人）
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;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");Operater operater=new Operater();List<Contact> contacts=operater.allContacts();PrintWriter writer=response.getWriter();/*** 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*/String html="";html+= "<!DOCTYPE html>";html+= "<html>";html+= "";html+= "<head>";html+= " <meta charset='utf-8'>";html+= " <title>查询所有联系人</title>";html+= " <style media='screen'>";html+= " table td {";html+= " text-align: center;";html+= " }";html+= "";html+= " table {";html+= " border-collapse: collapse;";html+= " }";html+= " </style>";html+= "</head>";html+= "";html+= "<body>";html+= " <center>";html+= " <h2>查询所有联系人</h2>";html+= " </center>";html+= " <table border='1' align='center'>";html+= " <tbody>";html+= " <thead>";html+= " <th>编号</th>";html+= " <th>姓名</th>";html+= " <th>性别</th>";html+= " <th>年龄</th>";html+= " <th>电话</th>";html+= " <th>QQ</th>";html+= " <th>邮箱</th>";html+= " <th>操作</th>";html+= " </thead>";html+= " ";html+= " <tr>";if (contacts!=null) {for (Contact contact : contacts) {html+= " <td>"+contact.getId()+"</td>";html+= " <td>"+contact.getName()+"</td>";html+= " <td>"+contact.getSex()+"</td>";html+= " <td>"+contact.getAge()+"</td>";html+= " <td>"+contact.getPhone()+"</td>";html+= " <td>"+contact.getQq()+"</td>";html+= " <td>"+contact.getEmail()+"</td>";html+= " <td><a href='"+request.getContextPath()+"/FindIdServlet?id="+contact.getId()+"'>修改</a> <a href='"+request.getContextPath()+"/DeleteServlet?id="+contact.getId()+"'>删除</a></td>";html+= " </tr>";}}html+= " <tr>";html+= " <td colspan='8'>";html+= " <a href='"+request.getContextPath()+"/add.html'''>添加联系人</a>";html+= " </td>";html+= " </tr>";html+= " </tbody>";html+= " </table>";html+= "</body>";html+= "";html+= "</html>";writer.write(html);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doGet(request, response);}}
添加联系人的servlet
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;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");Operater operater=new Operater();Contact contact=new Contact();contact.setName(userName);contact.setAge(age);contact.setSex(sex);contact.setPhone(phone);contact.setQq(qq);contact.setEmail(email);try {operater.addContact(contact);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}response.sendRedirect(request.getContextPath()+"/Index");}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doGet(request, response);}}
修改联系人，根据查找到的联系人，显示在其上面如图（根据显示的首页显示得内容为本页面的默认值）
首先是要去查找这个联系人的信息，即FindIdServlet
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;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");PrintWriter writer=response.getWriter();Operater operater=new Operater();String id=request.getParameter("id");Contact contact=null;try {contact=operater.findContact(id);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}String html="";html += "<!DOCTYPE html>";html += "<html>";html += "<head>";html += " <meta charset='utf-8'>";html += " <title>添加联系人</title>";html += " <style media='screen'>";html += " #btn{";html += " width:40px;";html += " width: 50px;";html += " background: green;";html += " color: white;";html += " font-size:14px;";html += " }";html += " </style>";html += "</head>";html += "";html += "<body>";html += " <center>";html += " <h2>修改联系人</h2>";html += " </center>";html += " <form action='"+request.getContextPath()+"/UpdateServlet' method='post'>";html +="<input type='hidden' name='id' value='"+id+"' />";html += " <table border='1' align='center'>";html += " <tbody>";html += " <tr>";html += " <th>姓名</th>";html += " <td><input type='text' name='userName' value='"+contact.getName()+"'/></td>";html += " </tr>";html += " <tr>";html += " <th>年龄</th>";html += " <td><input type='text' name='age' value='"+contact.getAge()+"' /></td>";html += " </tr>";html += " <tr>";html += " <th>性别</th>";html += " <td>";if (contact.getSex().equals("男")) {html += " <input type='radio' name='sex' value='男' checked='checked'/>男 ";html += " <input type='radio' name='sex' value='女' />女";}else {html += " <input type='radio' name='sex' value='男' />男 ";html += " <input type='radio' name='sex' value='女' checked='checked' />女";}html += " </td>";html += " </tr>";html += " <tr>";html += " <th>电话</th>";html += " <td><input type='text' name='phone' value='"+contact.getPhone()+"' /></td>";html += " </tr>";html += " <tr>";html += " <th>QQ</th>";html += " <td><input type='text' name='qq' value='"+contact.getQq()+"' /></td>";html += " </tr>";html += " <tr>";html += " <th>邮箱</th>";html += " <td><input type='text' name='email' value='"+contact.getEmail()+"' /></td>";html += " </tr>";html += " <tr>";html += " <td colspan='3' align='center'>";html += " <input type='submit' value='提交' id='btn'/>";html += " </td>";html += " </tr>";html += " </tbody>";html += " </table>";html += " </form>";html += "</body>";html += "";html += "</html>";writer.write(html);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doGet(request, response);}}
然后则是根据提交的内容去修改本地的联系人
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;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");System.out.println(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");Operater operater=new Operater();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 {operater.updateContact(contact);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}response.sendRedirect(request.getContextPath()+"/Index");}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doGet(request, response);}}
最后则是删除联系人，不过要注意的是：火狐浏览器如果判断是get请求的话，会向服务器发送两次请求，可能会导致一些问题，其他的浏览器不会出出现该问题
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;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");Operater operater=new Operater();try {operater.removeContact(id);} catch (Exception e) {// TODO Auto-generated catch blocke.printStackTrace();}response.sendRedirect(request.getContextPath()+"/Index");}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doGet(request, response);}
}
最后：不用jsp去写，就用servlet去写html真的好累，还是好好学jsp吧。
