表单传输链接数据库问题
2016-12-18 本文已影响21人
itachi
根据JDBC里面的内容在web项目中建立添加和查询的servlet
package web;
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 dao.EmpDao;
import entity.Emp;
public class AddEmpServlet extends HttpServlet{
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
//1.获取表单参数
req.setCharacterEncoding("utf-8");
String name = req.getParameter("name");
String salary = req.getParameter("salary");
String age = req.getParameter("age");
//封装成emp对象
Emp emp = new Emp();
emp.setName(name);
emp.setAge(Integer.parseInt(age));
emp.setSalary(Double.parseDouble(salary));
//3.保存员工
EmpDao dao = new EmpDao();
dao.save(emp);
//4.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();
}
}
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 dao.EmpDao;
import entity.Emp;
public class FindEmpServlet extends HttpServlet{
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
//1.查询全部员工
EmpDao dao = new EmpDao();
List<Emp> list = dao.findAll();
//响应输出全部员工
resp.setContentType("text/html;charset=utf-8");
PrintWriter out = resp.getWriter();
//输出静态的html
//包含版本声明，根元素，head，body，table，标题行
out.println("<!doctype html>");
out.println("<html>");
out.println(" <head>");
out.println(" <meta charset='utf-8'>");
out.println(" <title>员工管理列表</title>");
out.println(" </head>");
out.println(" <body>");
//当前路径：/emp/findEmp
//目标路径：/emp/add_emp.html
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>");
//2.输出动态部分的html
//包括：数据行，有多少个员工就有多少个数据行
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(" </tr>");
}
out.println(" </table>");
out.println(" </body>");
out.println("</html>");
}
}
