package web;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import Util.DAOFactory;
import Dao.EmpDAO;
import Dao.impl.EmpDAOJdbcImpl;
import entity.Emp;
public class ActionServlet extends HttpServlet {
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
//由于该Servlet要求处理所有的请求，因此必须判断出请求的来源
//不同的来源业务有本质的区别，请求来源看规范
req.setCharacterEncoding("UTF-8");
String uri=req.getRequestURI();
String path=uri.substring(uri.lastIndexOf("/"),uri.lastIndexOf("."));
if(path.equals("/findEmp")){
//查询所有员工
findEmp(req,resp);
}else if(path.equals("/addEmp")){
//新增员工
addEmp(req,resp);
}else if(path.equals("/delEmp")){
delEmp(req,resp);
//删除员工
}else if(path.equals("/loadEmp")){
//加载员工
loadEmp(req,resp);
}else if(path.equals("/modifyEmp")){
//修改一个员工信息
modifyEmp(req,resp);
}
}
protected void findEmp(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
//查询 全部员工
EmpDAO dao=(EmpDAO)DAOFactory.getInstance("EmpDao");
List<Emp> list=dao.findAll();
resp.setContentType("text/html;charset=UTF-8");
PrintWriter out=resp.getWriter();
//输出静态HTML
//包含版本申明，根元素 head body table 等等
out.println("<!DOCTYPE html>");
out.println("<html>");
out.println("<head>");
out.println("<meta http-equiv='content-type' content='text/html; charset=UTF-8'>");
out.println(" <title>员工原理列表</title>");
out.println("</head>");
out.println("<body>");
out.println("<a href='add_emp.html'>新增</a>");
out.println("<table width='40%' border='1px' cellspacing='0px'>");
out.println("<tr>");
out.println("<th>编号</th>");
out.println("<th>姓名</th>");
out.println("<th>薪资</th>");
out.println("<th>年龄</th>");
out.println("<th>操作</th>");
out.println("</tr>");
for(Emp e:list){
out.println("<tr>");
out.println("<td>"+e.getId()+"</td>");
out.println("<td>"+e.getName()+"</td>");
out.println("<td>"+e.getSalary()+"</td>");
out.println("<td>"+e.getAge()+"</td>");
out.println("<td><a href='delEmp.do?id="+e.getId()+"'>删除</a>" +
" <a href='loadEmp.do?id="+e.getId()+"'>修改</a></td>");
out.println("</tr>");
}
out.println("</table>");
out.println("</body>");
out.println("</html>");
}
protected void addEmp(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
//获取对象
req.setCharacterEncoding("UTF-8");
String name=req.getParameter("name");
String salary=req.getParameter("salary");
String age=req.getParameter("age");
//封装对象
Emp emp=new Emp();
emp.setName(name);
emp.setAge(Integer.parseInt(age));
emp.setSalary(Double.parseDouble(salary));
//保存
EmpDAO dao=new EmpDAOJdbcImpl();
dao.save(emp);
//响应，输出提示信息
/* resp.setContentType("text/html;charset=utf-8");
PrintWriter out=resp.getWriter();
out.println("<h1>新增成功</h1>");
out.close();*/
//修改响应改为重定向
resp.sendRedirect("findEmp.do");
}
protected void delEmp(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
//获取参数
req.setCharacterEncoding("UTF-8");
String id=req.getParameter("id");
//删除员工
EmpDAO dao=new EmpDAOJdbcImpl();
dao.delete(Integer.parseInt(id));
//删除后需要 跳转到员工查询页面
//由于员工的查询和删除是两个独立的组件，可以使用重定向
resp.sendRedirect("findEmp.do");
}
protected void loadEmp(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
req.setCharacterEncoding("UTF-8" );
String id=req.getParameter("id");
EmpDAOJdbcImpl dao=new EmpDAOJdbcImpl();
Emp e=dao.findById(Integer.parseInt(id));
resp.setContentType("text/html;charset=utf-8");
PrintWriter out=resp.getWriter();
out.println("<form action='modifyEmp.do' method='post'>");
out.println("<input type='hidden' name='id' value='"+e.getId()+"'></br>");
out.println("姓名：<input name='name' value='"+e.getName()+"'></br>");
out.println("年龄：<input name='age' value='"+e.getAge()+"'></br>");
out.println("薪资：<input name='salary' value='"+e.getSalary()+"'></br>");
out.println("<input type='submit' value='确认'>");
out.println("</form>");
out.close();
}
protected void modifyEmp(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
req.setCharacterEncoding("UTF-8");
Emp e=new Emp();
e.setId(Integer.parseInt(req.getParameter("id")));
e.setAge(Integer.parseInt(req.getParameter("age")));
e.setSalary(Double.parseDouble(req.getParameter("salary")));
e.setName(req.getParameter("name"));
EmpDAOJdbcImpl dao=new EmpDAOJdbcImpl();
dao.update(e);
resp.sendRedirect("findEmp.do");
}
}
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