2020.12.9收获

CourseServlet.java

package servlet;
import java.io.IOException;
import java.util.List;
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 entity.Course;
import dao.CourseDao;
@WebServlet("/CourseServlet")
public class CourseServlet extends HttpServlet {
    
    private static final long serialVersionUID = 1L;
     public CourseServlet() {
            super();
            // TODO Auto-generated constructor stub
        }
    CourseDao dao = new CourseDao();
    
    
    protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        req.setCharacterEncoding("utf-8");
        String method = req.getParameter("method");
        if ("add".equals(method)) {
            add(req, resp);
        } else if ("del".equals(method)) {
            del(req, resp);
        } else if ("update".equals(method)) {
            update(req, resp);
        } else if ("search".equals(method)) {
            search(req, resp);
        } else if ("getCourseById".equals(method)) {
            getCourseById(req, resp);
        } else if ("getcoursebyname".equals(method)) {
            getCourseByName(req, resp);
        } else if ("list".equals(method)) {
            list(req, resp);
        }
        else if ("searchlist".equals(method)) {
            searchlist(req, resp);
        }
    }

    
    private void add(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException {
        req.setCharacterEncoding("utf-8");
        String name = req.getParameter("name");
        String sex = req.getParameter("sex");
        String minzu = req.getParameter("minzu");
        String time = req.getParameter("time");
        String age = req.getParameter("age");
        String mianmao = req.getParameter("mianmao");
        String fuwu = req.getParameter("fuwu");
        Course course = new Course(name, sex, minzu, time,age,mianmao,fuwu);
        Course course1 = dao.getCourseByName(name);
        
        if(course1==null) {
            dao.add(course);
            req.setAttribute("message", "添加成功");
            req.getRequestDispatcher("add.jsp").forward(req,resp);
        } else {
            req.setAttribute("message", "失败：姓名重复");
            req.getRequestDispatcher("add.jsp").forward(req,resp);
        }
    }
    
    
    private void list(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
        req.setCharacterEncoding("utf-8");
        List<Course> courses = dao.list();
        req.setAttribute("courses", courses);
        req.getRequestDispatcher("list.jsp").forward(req,resp);
    }
    private void searchlist(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
        req.setCharacterEncoding("utf-8");
        List<Course> courses = dao.list();
        req.setAttribute("courses", courses);
        req.getRequestDispatcher("searchlist.jsp").forward(req,resp);
    }

    
    private void getCourseById(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
        req.setCharacterEncoding("utf-8");
        int id = Integer.parseInt(req.getParameter("id"));
        Course course = dao.getCourseById(id);
        req.setAttribute("course", course);
        req.getRequestDispatcher("detail2.jsp").forward(req,resp);
    }

    
    private void getCourseByName(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
        req.setCharacterEncoding("utf-8");
        String name = req.getParameter("name");
        Course course = dao.getCourseByName(name);
        if(course == null) {
            req.setAttribute("message", "无此志愿者");
            req.getRequestDispatcher("del.jsp").forward(req,resp);
        } else {
            req.setAttribute("course", course);
            req.getRequestDispatcher("detail.jsp").forward(req,resp);
        }
    }
    
    
    private void del(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
        req.setCharacterEncoding("utf-8");
        int id = Integer.parseInt(req.getParameter("id"));
        dao.delete(id);
        req.setAttribute("message", "删除成功");
        req.getRequestDispatcher("del.jsp").forward(req,resp);
    }
    
    
    private void update(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
        req.setCharacterEncoding("utf-8");
        int id = Integer.parseInt(req.getParameter("id"));
        String name = req.getParameter("name");
        String sex = req.getParameter("sex");
        String minzu = req.getParameter("minzu");
        String time = req.getParameter("time");
        String age = req.getParameter("age");
        String mianmao = req.getParameter("mianmao");
        String fuwu = req.getParameter("fuwu");
        Course course = new Course(id,name, sex, minzu, time,age,mianmao,fuwu);
        
        dao.update(course);
        req.setAttribute("message", "修改成功");
        req.getRequestDispatcher("CourseServlet?method=list").forward(req,resp);
    }
    
    
    private void search(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
        req.setCharacterEncoding("utf-8");
        String name = req.getParameter("name");
        String sex = req.getParameter("sex");
        String minzu = req.getParameter("minzu");
        String time = req.getParameter("time");
        String age = req.getParameter("age");
        String mianmao = req.getParameter("mianmao");
        String fuwu = req.getParameter("fuwu");
        List<Course> courses = dao.search(name, sex, minzu, time,age,mianmao,fuwu);
        Course course1 = dao.getCourseByName(name);
        if(course1 == null) {
            req.setAttribute("message", "无此志愿者");
            req.getRequestDispatcher("search.jsp").forward(req,resp);
        } else {
            req.setAttribute("courses", courses);
            req.getRequestDispatcher("searchlist.jsp").forward(req,resp);
        }
    }
}