Java Servlet 中的许多方法调用示例

最新推荐文章于 2023-01-13 18:27:31 发布

IT_Jeff

最新推荐文章于 2023-01-13 18:27:31 发布

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分类专栏： JavaServlet Java

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本文展示了如何在Java Servlet中实现学生管理的CRUD操作。通过StudentServlet类，详细讲解了添加、列出、更新和删除学生信息的方法调用过程，涉及DAO层与视图跳转。

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以下是我写的一个Student的Servlet类，其中包含增删改查，在Servlet中的方法调用

package com.stu.servlet;

import java.io.IOException;

import java.sql.SQLException;
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.stu.bean.Student;
import com.stu.dao.ClasssDAO;
import com.stu.dao.StudentDAO;

public class StudentServlet extends HttpServlet {

public StudentServlet() {
super();
}

public void destroy() {
super.destroy();
}

public void add(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException, SQLException {

ClasssDAO studao = new ClasssDAO();
List list = studao.classList();
request.setAttribute("classslist", list);
request.getRequestDispatcher("student/add.jsp").forward(request, response);
}
public void list(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException, SQLException {

StudentDAO studao = new StudentDAO();
List list = studao.studentList();
request.setAttribute("list", list);
request.getRequestDispatcher("student/list.jsp").forward(request,response);
}

public void addProcess(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException, SQLException {

         String name = request.getParameter("name");
         String sex = request.getParameter("sex");
         String phone = request.getParameter("phone");
         int classsId = Integer.parseInt(request.getParameter("classsId"));

         StudentDAO studao = new StudentDAO();
         int row = studao.add(name, sex, phone, classsId);

         request.getSession().setAttribute("row", row);
         response.sendRedirect("result.jsp");

}

public void update(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException, SQLException {

   int id = Integer.parseInt(request.getParameter("id"));

   StudentDAO studao = new StudentDAO();
   Student stu = studao.getstudentById(id);

   List list = new ClasssDAO().classList();

   request.setAttribute("stu", stu);
   request.setAttribute("classsList", list);
   request.getRequestDispatcher("student/update.jsp").forward(request, response);
}

public void updateProcess(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException, SQLException {

   int id = Integer.parseInt(request.getParameter("id"));
   String name = request.getParameter("name");
   String sex = request.getParameter("sex");
   String phone = request.getParameter("phone");
   int classsId = Integer.parseInt(request.getParameter("classsId"));

   StudentDAO studao = new StudentDAO();
   int row = studao.update(id,name,sex,phone,classsId);

   request.getSession().setAttribute("row",row);
   response.sendRedirect("result.jsp");

}

public void delete(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException, SQLException {

   int id = Integer.parseInt(request.getParameter("id"));

   StudentDAO stu = new StudentDAO();
   int row = stu.delete(id);

   request.getSession().setAttribute("row", row);
   response.sendRedirect("result.jsp");
}

public void process(HttpServletRequest request, HttpServletResponse response)
          throws ServletException, IOException, SQLException {

   String method = request.getParameter("method");
   if (null == method ||"list".equals(method)) {
        list(request, response);
        return;
   }
   else if ("add".equals(method)) {
    add(request, response);
    return;
   }else if("addProcess".equals(method)){
    addProcess(request, response);
    return;
   }else if("update".equals(method)){
    update(request, response);
    return;
   }else if("updateProcess".equals(method)){
    updateProcess(request, response);
    return;
   }else if("delete".equals(method)){
    delete(request, response);
    return;
   }

}

public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
try {
   process(request, response);

} catch (SQLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
}
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
try {
   process(request, response);

} catch (SQLException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
}
}