com.jsj.web.manage====新闻发布系统（11）

2020-05-15

这个是管理员的Servlet

ManageServlet

package com.jsj.web.manage;

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 java.io.IOException;

@WebServlet("/admin/manage")
public class ManageServlet extends HttpServlet {

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.getRequestDispatcher("/WEB-INF/view/admin/manage/index.jsp").forward(request,response);
    }
}

NewsCateServlet

package com.jsj.web.manage;

import com.jsj.entity.NewsCate;
import com.jsj.factory.ServiceFactory;
import com.jsj.service.NewsCateService;

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 java.io.IOException;
import java.io.PrintWriter;
import java.util.List;

@WebServlet("/admin/manage/newsCate")
public class NewsCateServlet extends HttpServlet {

    private NewsCateService newsCateService = (NewsCateService) ServiceFactory.getService("NewsCateService");

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        List<NewsCate> allCate = newsCateService.getAllCate();
        request.setAttribute("allCate",allCate);
        request.getRequestDispatcher("/WEB-INF/view/admin/manage/newsCate.jsp").forward(request,response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException {
        response.setContentType("text/html;charset=UTF-8");
        try(PrintWriter out = response.getWriter()){
            if (request.getParameter("method")!=null&&request.getParameter("method").equals("insert")){
                //新增分类
                insert(request,out);
            }else if (request.getParameter("name")!=null){
                //修改分类
                update(request,out);
            }else {
                //删除分类
                delete(request, out);
            }
            response.setHeader("refresh", "2;url=/admin/manage/newsCate");
        }
    }

    /**
     * 添加分类
     */
    private void insert(HttpServletRequest request,PrintWriter out) {
        String name = request.getParameter("name");
        NewsCate newsCate = new NewsCate();
        newsCate.setName(name);
        int res = newsCateService.insert(newsCate);
        if (res>0){
            out.println("添加成功");
        }else {
            out.println("添加失败");
        }
    }

    /**
     * 删除分类
     */
    private void delete(HttpServletRequest request, PrintWriter out) {
        Integer id = Integer.valueOf(request.getParameter("id"));
        int res = newsCateService.delete(id);
        if (res>0){
            out.println("删除成功");
        }else {
            out.println("添加失败");
        }
    }

    /**
     * 修改分类
     */
    private void update(HttpServletRequest request,PrintWriter out) {
        String name = request.getParameter("name");
        Integer id = Integer.valueOf(request.getParameter("id"));
        NewsCate newsCate = new NewsCate();
        newsCate.setId(id);
        newsCate.setName(name);
        int res = newsCateService.update(newsCate);
        if (res>0){
            out.println("修改成功");
        }else {
            out.println("修改失败");
        }
    }

}

NewsServlet

package com.jsj.web.manage;

import com.jsj.entity.NewsVo;
import com.jsj.entity.Page;
import com.jsj.factory.ServiceFactory;
import com.jsj.service.NewsService;

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 java.io.IOException;
import java.io.PrintWriter;

@WebServlet("/admin/manage/news")
public class NewsServlet extends HttpServlet {

    private NewsService newsService = (NewsService) ServiceFactory.getService("NewsService");

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        try{
            int pageIndex = request.getParameter("pageIndex") == null ? 1 : Integer.valueOf(request.getParameter("pageIndex"));
            int pageSize = 10;
            Page<NewsVo> newsVoPage = newsService.getNewsVoPage(pageIndex,pageSize);
            if (newsVoPage.getBeanList() == null || newsVoPage.getBeanList().size() == 0){
                request.getRequestDispatcher("/WEB-INF/view/error/error.jsp").forward(request, response);
            }else {
                request.setAttribute("newsVoPage", newsVoPage);
                request.getRequestDispatcher("/WEB-INF/view/admin/manage/news.jsp").forward(request,response);
            }
        }catch (Exception e){
            request.getRequestDispatcher("/WEB-INF/view/error/error.jsp").forward(request, response);
        }

    }

    /**
     * 删除新闻文章
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException {
        response.setContentType("text/html;charset=UTF-8");
        try(PrintWriter out = response.getWriter()){
            Integer id = Integer.valueOf(request.getParameter("id"));
            int res = newsService.deleteNewsById(id);
            if (res>0){
                out.println("新闻删除成功");
            }else {
                out.println("新闻删除失败");
            }
            response.setHeader("refresh", "2;url=/admin/manage/news");
        }
    }


}

PublishNewsServlet

package com.jsj.web.manage;

import com.jsj.entity.Admin;
import com.jsj.entity.News;
import com.jsj.entity.NewsCate;
import com.jsj.factory.ServiceFactory;
import com.jsj.service.NewsCateService;
import com.jsj.service.NewsService;

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 java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;
import java.util.List;

@WebServlet("/admin/manage/publish")
public class PublishNewsServlet extends HttpServlet {

    private NewsCateService newsCateService = (NewsCateService) ServiceFactory.getService("NewsCateService");

    private NewsService newsService = (NewsService) ServiceFactory.getService("NewsService");

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        List<NewsCate> allCate = newsCateService.getAllCate();
        request.setAttribute("allCate",allCate);
        request.getRequestDispatcher("/WEB-INF/view/admin/manage/publish.jsp").forward(request,response);
    }

    /**
     * 发表文章
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws IOException {
        response.setContentType("text/html;charset=UTF-8");
        try(PrintWriter out = response.getWriter()){

            Admin admin = (Admin) request.getSession().getAttribute("admin");
            News news = new News();
            //获取新闻的标题
            news.setTitle(request.getParameter("title"));
            //获取作者的信息
            news.setAuthor(admin.getUsername());
            //获取cateid，转换类型为int形
            news.setCateId(Integer.valueOf(request.getParameter("cate")));
            //new Date()会将当前时间设置为初始值
            news.setTime(new Date());
            //获取新闻内容
            news.setContent(request.getParameter("content"));
            //res是个标记，主要是用来表示是否成功
            int res = newsService.publish(news);

            if (res>0){
                out.println("新闻发表成功");
            }else {
                out.println("新闻发表失败");
            }
            response.setHeader("refresh", "2;url=/admin/manage");
        }
    }

}