此方法用于在对Javaee开发中的通过对应的名称而选择servlet中的对应的方法
注：主要代码如下
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { /** * 这是设置浏览器编码的问题 */ req.setCharacterEncoding("UTF-8"); resp.setContentType("text/html,charset=UTF-8"); String servletPath = req.getServletPath(); String methodName = servletPath.substring(1); methodName = methodName.substring(0, methodName.length()-4); System.out.println(methodName); try { /** * 根据反射机制选择servlet对应的方法 */ Method method = getClass().getDeclaredMethod(methodName, HttpServletRequest.class, HttpServletResponse.class); /** * 利用反射调用对应的方法 */ method.invoke(this, req,resp); } catch (Exception e) { e.printStackTrace(); System.out.println("这里是登录的时候反射机制的地方出错了！"); req.getRequestDispatcher("error.jsp").forward(req, resp); } } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doGet(req, resp); }
示例
注：在后面的jsp页面中提交form表单中的 action="<%=request.getContextPath() %>/saveTeacher.ado"可以直接通过反射机制调用servlet中的saveTeacher方法
public class AdministratorsServlet extends HttpServlet { private static final long serialVersionUID = 1L; @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { /** * 这是设置浏览器编码的问题 */ req.setCharacterEncoding("UTF-8"); resp.setContentType("text/html,charset=UTF-8"); String servletPath = req.getServletPath(); String methodName = servletPath.substring(1); methodName = methodName.substring(0, methodName.length()-4); System.out.println(methodName); try { /** * 根据反射机制选择servlet对应的方法 */ Method method = getClass().getDeclaredMethod(methodName, HttpServletRequest.class, HttpServletResponse.class); /** * 利用反射调用对应的方法 */ method.invoke(this, req,resp); } catch (Exception e) { e.printStackTrace(); System.out.println("这里是登录的时候反射机制的地方出错了！"); req.getRequestDispatcher("error.jsp").forward(req, resp); } } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doGet(req, resp); } /** * 基于对教师的基本操作 */ /** * 添加一个教师 * @param req * @param resp * @throws ServletException * @throws IOException */ private void saveTeacher(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { try { Teachers teacher = new Teachers(); teacher.setTeacherId(Integer.parseInt(req.getParameter("teacherId"))); teacher.setTeacherName(req.getParameter("teacherName")); teacher.setSex(req.getParameter("sex")); teacher.setPhoneNo(req.getParameter("phoneNo")); teacher.setAddress(req.getParameter("address")); teacher.setBirthday(new Date(new SimpleDateFormat("yyyy-MM-dd").parse(req.getParameter("birthday")).getTime())); teacher.setSalary(new BigDecimal(req.getParameter("salary"))); ITeachersService teacherService = new TeachersServiceImpl(); int rows = teacherService.save(teacher); if(rows>0) { System.out.println("保存一个教师基本信息成功！"); req.getRequestDispatcher("saveSuccess.jsp").forward(req, resp); } } catch (Exception e) { e.printStackTrace(); System.out.println("添加一个教师对象基本信息的时候失败！"); resp.sendRedirect("error.jsp"); } } }
一、首先在web.xml文件里面配置相关的信息如下
注： <url-pattern>*.ado</url-pattern> 中的*则代表所选的对应方法
<servlet>
<servlet-name>AdministratorsServlet</servlet-name>
<servlet-class>cn.gbb.student_achievement_system.controller.AdministratorsServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>AdministratorsServlet</servlet-name>
<url-pattern>*.ado</url-pattern>
</servlet-mapping>
二、在jsp页面中from表单提交的时候需要注意它提交的action里面的内容
注： <form action="<%=request.getContextPath() %>/saveTeacher.ado" method="get">
1 <body style="height: 100%;width: 100%; background-image:url(lib/skr.jpg); background-size: cover;"> 2 <div style="height: 100px;width: 100%; text-align: center;"> 3 <h1>学生成绩管理系统</h1> 4 </div> 5 <div align="center"> 6 <form action="<%=request.getContextPath() %>/saveTeacher.ado" method="get"> 7 <% 8 Teachers_Login teacherLogin = (Teachers_Login) request.getAttribute("teacherLogin"); 9 %> 10 <input type="hidden" name="teacherId" value="<%=teacherLogin.getTeacherId()%>"> 11 <input type="hidden" name="teacherName" value="<%=teacherLogin.getTeacherName()%>"> 12 <table> 13 <tr> 14 <th colspan="2" align="center">请填写教师的基本信息</th> 15 </tr> 16 <tr> 17 <td>职工号：</td> 18 <td><%=teacherLogin.getTeacherId()%></td> 19 </tr> 20 <tr> 21 <td>姓名：</td> 22 <td><%=teacherLogin.getTeacherName()%></td> 23 </tr> 24 <tr> 25 <td>性别：</td> 26 <td><input type="text" name="sex"></td> 27 </tr> 28 <tr> 29 <td>电话号码：</td> 30 <td><input type="text" name="phoneNo"></td> 31 </tr> 32 <tr> 33 <td>家庭住址：</td> 34 <td><input type="text" name="address"></td> 35 </tr> 36 <tr> 37 <td>出生日期：</td> 38 <td><input type="text" name="birthday"></td> 39 </tr> 40 <tr> 41 <td>工资：</td> 42 <td><input type="text" name="salary"></td> 43 </tr> 44 <tr> 45 <td colspan="2" style="text-align: center;"><input type="submit" value="确定"><input type="reset" value="重置"></td> 46 </tr> 47 </table> 48 </form> 49 <p style="text-align: center;"><a href="administratorsMain.jsp">返回首页</a></p> 50 </div> 51 </body>
总结：这样就可以在jsp页面提交的时候选择servlet里面的所对应的方法了，希望对您有所帮助，谢谢！！！！！
原文：https://www.cnblogs.com/gaobingbing/p/10567560.html