今天一天满课，上完课已经下午5点，吃了饭回到宿舍就开始敲代码，连接了数据库
package com.itheima.web.servlet; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; /** * 替换HttpServlet,根据请求的最后一段路径来进行方法分发 */ public class BaseServlet extends HttpServlet { //根据请求的最后一段路径来进行方法分发 @Override protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //1. 获取请求路径 String uri = req.getRequestURI(); // /brand-case/brand/selectAll // System.out.println(uri); //2. 获取最后一段路径，方法名 int index = uri.lastIndexOf('/'); String methodName = uri.substring(index + 1); // /selectAll? selectAll? // System.out.println(methodName); //2. 执行方法 //2.1 获取BrandServlet /UserServlet 字节码对象 Class //System.out.println(this); Class<? extends BaseServlet> cls = this.getClass(); //2.2 获取方法 Method对象 try { Method method = cls.getMethod(methodName, HttpServletRequest.class, HttpServletResponse.class); //2.3 执行方法 method.invoke(this,req,resp); } catch (NoSuchMethodException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } catch (InvocationTargetException e) { e.printStackTrace(); } } }
package com.itheima.web.servlet; import com.alibaba.fastjson.JSON; import com.itheima.pojo.Brand; import com.itheima.pojo.PageBean; import com.itheima.service.BrandService; import com.itheima.service.impl.BrandServiceImpl; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.BufferedReader; import java.io.IOException; import java.util.List; @WebServlet("/brand/*") public class BrandServlet extends BaseServlet{ private BrandService brandService = new BrandServiceImpl(); public void selectAll(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //1. 调用service查询 List<Brand> brands = brandService.selectAll(); //2. 转为JSON String jsonString = JSON.toJSONString(brands); //3. 写数据 response.setContentType("text/json;charset=utf-8"); response.getWriter().write(jsonString); } public void add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //1. 接收品牌数据 BufferedReader br = request.getReader(); String params = br.readLine();//json字符串 //转为Brand对象 Brand brand = JSON.parseObject(params, Brand.class); //2. 调用service添加 brandService.add(brand); //3. 响应成功的标识 response.getWriter().write("success"); } /** * 批量删除 * @param request * @param response * @throws ServletException * @throws IOException */ public void deleteByIds(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //1. 接收数据 [1,2,3] BufferedReader br = request.getReader(); String params = br.readLine();//json字符串 //转为 int[] int[] ids = JSON.parseObject(params, int[].class); //2. 调用service添加 brandService.deleteByIds(ids); //3. 响应成功的标识 response.getWriter().write("success"); } //修改 public void update(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //1. 接收数据 BufferedReader br = request.getReader(); String params = br.readLine();//json字符串 //转为 brand Brand brand = JSON.parseObject(params, Brand.class); //2. 调用service添加 brandService.update(brand); //3. 响应成功的标识 response.getWriter().write("success"); } //删除单个 public void deleteById(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String _id = request.getParameter("id"); int i = Integer.parseInt(_id); //2. 调用service添加 brandService.deleteById(i); //3. 响应成功的标识 response.getWriter().write("success"); } /** * 分页查询 * @param request * @param response * @throws ServletException * @throws IOException */ public void selectByPage(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //1. 接收 当前页码 和 每页展示条数 url?currentPage=1&pageSize=5 String _currentPage = request.getParameter("currentPage"); String _pageSize = request.getParameter("pageSize"); int currentPage = Integer.parseInt(_currentPage); int pageSize = Integer.parseInt(_pageSize); //2. 调用service查询 PageBean<Brand> pageBean = brandService.selectByPage(currentPage, pageSize); //2. 转为JSON String jsonString = JSON.toJSONString(pageBean); //3. 写数据 response.setContentType("text/json;charset=utf-8"); response.getWriter().write(jsonString); } /** * 分页条件查询 * @param request * @param response * @throws ServletException * @throws IOException */ public void selectByPageAndCondition(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //1. 接收 当前页码 和 每页展示条数 url?currentPage=1&pageSize=5 String _currentPage = request.getParameter("currentPage"); String _pageSize = request.getParameter("pageSize"); int currentPage = Integer.parseInt(_currentPage); int pageSize = Integer.parseInt(_pageSize); // 获取查询条件对象 BufferedReader br = request.getReader(); String params = br.readLine();//json字符串 //转为 Brand Brand brand = JSON.parseObject(params, Brand.class); //2. 调用service查询 PageBean<Brand> pageBean = brandService.selectByPageAndCondition(currentPage,pageSize,brand); //2. 转为JSON String jsonString = JSON.toJSONString(pageBean); //3. 写数据 response.setContentType("text/json;charset=utf-8"); response.getWriter().write(jsonString); } }
package com.itheima.web.servlet; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; @WebServlet("/user/*") public class UserServlet extends BaseServlet{ public void selectAll(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("user selectAll..."); } public void add(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { System.out.println("user add..."); } }
明天就要进行建民哥的测试了，有点紧张，继续加油！
