QueryContact.java example

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package com.rlovep.contact.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.rlovep.contact.dao.ContactDao;
import com.rlovep.contact.dao.impl.ContactDaoImpl;
import com.rlovep.contact.entity.Contact;

/**
 * Servlet implementation class QueryContact
 */
@WebServlet("/QueryContact")
public class QueryContact extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public QueryContact() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String id=request.getParameter("id");
		ContactDao dao=new ContactDaoImpl();
		//通过id找到相应的对象；
		Contact contact=dao.findById(id);
		//3.把联系人显示到浏览器中
				response.setContentType("text/html;charset=utf-8");
				PrintWriter writer = response.getWriter();
				
				String html = "";
				
				html += "<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.0 Transitional//EN' 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd'>";
				html += "<html xmlns='http://www.w3.org/1999/xhtml'>";
				html += "<head>";
				html += "<meta http-equiv='Content-Type' content='text/html; charset=utf-8' />";
				html += "<title>修改联系人</title>";
				html += "</head>";
				html += "";
				html += "<body>";
				html += "<center><h3>修改联系人</h3></center>";
				html += "<form action='"+request.getContextPath()+"/UpdateContact' method='post'>";
				//注意：添加id的隐藏域
				html += "<input type='hidden' name='id' value='"+contact.getId()+"'/>";
				html += "<table align='center' border='1' width='300px'>";
				html += "    <tr>";
				html += "    	<th>姓名</th>";
				html += "        <td><input type='text' name='name' value='"+contact.getName()+"'/></td>";
				html += "    </tr>";
				html += "    <tr>";
				html += "    	<th>性别</th>";
				html += "        <td>";
				
				if(contact.getGender().equals("男")){
					html += "        <input type='radio' name='gender' value='男' checked='checked'/>男";
					html += "        <input type='radio' name='gender' value='女'/>女";
				}else if(contact.getGender().equals("女")){
					html += "        <input type='radio' name='gender' value='男'/>男";
					html += "        <input type='radio' name='gender' value='女' checked='checked'/>女";
				}else{
					html += "        <input type='radio' name='gender' value='男' checked='checked'/>男";
					html += "        <input type='radio' name='gender' value='女'/>女";
				}
			
				html += "        </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>电话</th>";
				html += "        <td><input type='text' name='phone' value='"+contact.getPhone()+"'/></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 += "    	<th>QQ</th>";
				html += "        <td><input type='text' name='qq' value='"+contact.getQq()+"'/></td>";
				html += "    </tr>";
				html += "    <tr>";
				html += "        <td colspan='2' align='center'>";
				html += "        <input type='submit' value='保存'/> ";
				html += "        <input type='reset' value='重置'/></td>";
				html += "    </tr>";
				html += "</table>";
				html += "</form>";
				html += "</body>";
				html += "</html>";

				
				
				writer.write(html);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}

}