url里出现"+"的情况,request.getParameter("")取到的+号为空格

解决方式:对url进行转义,java可使用URLEncoder.encode(url)  ,javaScript 里使用encodeURIComponent(url)
检查以下语法错误:<body> <a href="javascript:history.go(-1);">返回 </a> <a href="Main.jsp">主页</a> <br> <br> 编写人姓名: 胡莲 学:20212310930228 <br> <% request.setCharacterEncoding("UTF-8"); String sxh = request.getParameter("xh").trim(); String sname = request.getParameter("name").trim(); String sclassname = request.getParameter("classname").trim(); int sage = Integer.parseInt(request.getParameter("age")); String saddress = request.getParameter("address").trim(); String sphone = request.getParameter("phone").trim(); String scity = request.getParameter("city").trim(); String snotes = request.getParameter("notes").trim(); String sql = "update student set name='" + sname + "'" + ",classname='" + sclassname + "'" + ",age='" + sage + "'"+ "'" + ",address='" + saddress + "'"+ "'" + ",phone='" + sphone + "'"+ "'" + ",city='" + scity + "'"+ "'" + ",notes='" + snotes + "'"+ "where xh='" + sxh + "'"; try { java.sql.Connection conn = null; Class.forName("com.mysql.jdbc.Driver").newInstance(); //加载驱动程序 conn = java.sql.DriverManager .getConnection( "jdbc:mysql://localhost:3306/studentdb?useUnicode=true&characterEncoding=utf8", "root", "123456"); //URL指向数据库student PreparedStatement pstatement = conn.prepareStatement(sql); //建立SQL语句 pstatement.execute(); //执行SQL语句 out.print("学生(" + sxh + "," + sname + "," + sclassname + "," + sage + ")");//打印sql out.println("信息更新成功!"); pstatement.close(); conn.close(); } catch (SQLException e1) { System.out.print("sql语句失败!"); e1.printStackTrace(); } catch (Exception e2) { System.out.print("sql语句失败!"); e2.printStackTrace(); } %> </body>
05-28
package com.cissst.servlet; import java.io.IOException; import javax.servlet.RequestDispatcher; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import com.cissst.entity.Admin; import com.cissst.entity.CustomAccount; import com.cissst.service.IAdminService; import com.cissst.service.ICustomAccountService; import com.cissst.service.impl.AdminServiceImpl; import com.cissst.service.impl.CustomAccountServiceImpl; import com.cissst.util.MD5Util; import com.mysql.cj.AbstractQuery; public class UserServlet extends HttpServlet { @Override protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("UTF-8"); response.setContentType("text/html;charset=UTF-8"); String action = request.getParameter("action"); IAdminService as = new AdminServiceImpl(); ICustomAccountService cs = new CustomAccountServiceImpl(); HttpSession session = request.getSession(); switch (action) { case "login": handleLogin(request, response, session, as, cs); break; case "logout": case "relogin": handleLogout(session, response); break; } } private void handleLogin(HttpServletRequest request, HttpServletResponse response, HttpSession session, IAdminService adminService, ICustomAccountService accountService) throws IOException { String username = request.getParameter("username"); String password = MD5Util.encode(request.getParameter("password")); String userType = request.getParameter("usertype"); // 根据用户类型验证登录 if ("admin".equals(userType)) { Admin admin = adminService.findBynp(username, password); if (admin != null) { session.setAttribute("admin", admin); response.sendRedirect("index.jsp"); return; } } else if ("user".equals(userType)) { CustomAccount account = accountService.findBynp(username, password); if (account != null) { session.setAttribute("custom_Account", account); response.sendRedirect("index2.jsp"); return; } } // 统一处理登录失败 handleLoginFailure(request, response); } private void handleLogout(HttpSession session, HttpServletResponse response) throws IOException { if (session != null) { session.invalidate(); } response.sendRedirect("login.jsp"); } private void handleLoginFailure(HttpServletRequest request, HttpServletResponse response) throws IOException { // 使用传入的 request 对象 HttpSession session = request.getSession(); session.setAttribute("loginError", "用户名或密码错误"); response.sendRedirect("login.jsp"); } } at com.cissst.servlet.UserServlet.service(UserServlet.java:36)
最新发布
08-04
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