业务逻辑：动态添加员工信息至列表，列表动态删除员工信息

    页面：employeeList.jsp

员工列表

Employees:

服务器：EmployeeListServlet.java

package ajaxbook.chap4;

import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class EmployeeListServlet
    extends HttpServlet {
  private static final String CONTENT_TYPE = "text/html; charset=GBK";

  //Initialize global variables
  public void init() throws ServletException {
  }

  //Process the HTTP Get request
  public void doGet(HttpServletRequest request, HttpServletResponse response) throws
      ServletException, IOException {
    //处理方法参数
    String action = request.getParameter("action");
    if (action.equals("add")){
      addEmployee(request,response);
    }else if (action.equals("delete")){
      deleteEmployee(request,response);
    }
  }

  //增加员工
  protected void addEmployee(HttpServletRequest request,
                             HttpServletResponse response) throws
      ServletException, IOException {
    //得到主键id
    String uniqueID = storeEmployee();

    //创建响应字串
    StringBuffer xml = new StringBuffer("");
    xml.append(uniqueID);
    xml.append("");
    xml.append("1");
    xml.append("");

    //发送
    sendResponse(response, xml.toString());
  }

  //删除员工
  protected void deleteEmployee(HttpServletRequest request,
                             HttpServletResponse response) throws
      ServletException, IOException {
    //得到参数id
    String id = request.getParameter("id");
   
    //创建响应字串
    StringBuffer xml = new StringBuffer(">");
    xml.append("1");
    xml.append("");

    //发送
    sendResponse(response, xml.toString());
  }

  //发送响应字串
  private void sendResponse(HttpServletResponse response, String responseText)throws IOException {
    response.setContentType("text/xml");
    response.getWriter().write(responseText);
  }

  //模拟数据库，得到主键id
  private String storeEmployee() {
    String uniqueID = "";
    Random randomizer = new Random(System.currentTimeMillis());
    for (int i = 0; i < 8; i++) {
      uniqueID += randomizer.nextInt(9);
    }

    return uniqueID;
  }
}

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