package service; import imp.UserDaoImp; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import bean.User; import dao.UserDao; public class admin_adduser extends HttpServlet { /** * Constructor of the object. */ public admin_adduser() { super(); } /** * Destruction of the servlet. <br> */ public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } /** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println("<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">"); out.println("<HTML>"); out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>"); out.println(" <BODY>"); out.print(" This is "); out.print(this.getClass()); out.println(", using the GET method"); out.println(" </BODY>"); out.println("</HTML>"); out.flush(); out.close(); } /** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to post. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("utf-8"); String uid=request.getParameter("uid"); String uname=request.getParameter("uname"); String uclass=request.getParameter("uclass"); String upassword=request.getParameter("upassword"); User user=new User(); user.setuId(uid); user.setuName(uname); user.setuClass(uclass); user.setuPassword(upassword); UserDao userdao=new UserDaoImp(); int result=userdao.addUser(user); System.out.println(result); if(result>0){ PrintWriter out=response.getWriter(); out.print("<script type='text/javascript'>"+ "alert('添加成功');window.location.href='../admin_manageruser.jsp';</script>"); out.flush(); out.close(); }else{ PrintWriter out=response.getWriter(); out.print("<script type='text/javascript'>"+ "alert('添加失败');window.location.href='../admin_manageruser.jsp';</script>"); out.flush(); out.close(); } String[] error = { "姓名未输入", "班级未输入", "学号未输入", "密码未输入" }; for (int i = 1; i < error.length; i++) { System.out.println(error[i]); } } /** * Initialization of the servlet. <br> * * @throws ServletException if an error occurs */ public void init() throws ServletException { // Put your code here } }
每一段代码都要反复考量，尽量减少没必要的，代码中的判断语句没有标注是判断那种变量，对其他Java文件会有连带影响，要注意关联