如何保持文本值，因爲它是後點擊提交按鈕

import java.util.Map; 
 
import java.util.HashMap; 
 

 
import javax.servlet.ServletRequest; 
 
import javax.servlet.http.HttpServletRequest; 
 

 
import org.springframework.stereotype.Controller; 
 
import org.springframework.web.bind.annotation.RequestMapping; 
 
import org.springframework.web.bind.annotation.RequestMethod; 
 
import org.springframework.web.bind.annotation.RequestParam; 
 

 
@Controller 
 
public class LoginController 
 
{ \t 
 
\t @RequestMapping(value="/login.htm", method = RequestMethod.GET) 
 
\t public String GetL(Map<String, Object> model){ 
 
\t \t return "login"; 
 
\t } 
 
\t 
 
\t private Map<String, String> LoginMap = new HashMap<String, String>(); 
 
\t 
 
    public Map<String, String> getLoginMap() { 
 
     return LoginMap; 
 
    } 
 
    
 
    public void setLoginMap(Map<String, String> LoginMap) { 
 
     this.LoginMap = LoginMap; 
 
     } 
 
\t 
 
\t @RequestMapping(value="/login.htm", method = RequestMethod.POST) 
 

 
\t public String login(@RequestParam(value="userid", required=true) String userid, 
 
\t \t \t \t \t \t @RequestParam(value="password", required=true) String password, 
 
\t \t \t \t \t \t @RequestParam(value="confirmpassword", required=true) String confirmpassword, 
 
\t \t \t \t \t \t @RequestParam(value="role", required=true) String role, 
 
\t \t \t \t \t \t Map<String, Object> model, ServletRequest request) 
 

 
{ 
 
\t \t if(userid.matches("^[a-zA-Z0-9]{5,24}$") && password.matches("^(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%^&+=])(?=\\S+$).{5,15}$") 
 
\t \t && confirmpassword.matches("^(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%^&+=])(?=\\S+$).{6,20}$") 
 
\t \t && (role.equals(new String("OPS(Operational)"))||role.equals(new String("Helpdesk")))) 
 
\t \t 
 
\t \t { 
 
    \t \t model.put("userid", userid); 
 
    \t \t model.put("password", password); 
 
    \t \t model.put("confirmpassword", confirmpassword); 
 
    \t \t model.put("role", role); 
 
    \t \t 
 
    \t \t System.out.println("successful!"); 
 
    \t \t return "page2"; 
 
\t \t } 
 
\t \t else 
 
\t \t { 
 
\t \t \t boolean validated = true; 
 
\t \t \t getLoginMap(); 
 
\t \t \t String errors =""; 
 
\t \t \t if(userid.isEmpty()) 
 
\t \t \t { 
 
\t \t \t \t validated = false; 
 
\t \t \t \t model.put("useridError","Please enter user id"); 
 
\t \t \t \t System.out.println("executed"); 
 
\t \t \t \t errors = "useridError&"; 
 
\t \t \t } 
 
\t \t \t if(password.isEmpty()) 
 
\t \t \t { 
 
\t \t \t \t validated = false; 
 
\t \t \t \t model.put("passwordError","Please enter password"); 
 
\t \t \t \t System.out.println("executed2"); 
 
\t \t \t \t errors.concat("passwordError&"); 
 
\t \t \t } 
 
\t \t \t if(confirmpassword.isEmpty()) 
 
\t \t \t { 
 
\t \t \t \t validated = false; 
 
\t \t \t \t model.put("confirmpasswordError","Please enter confirmpassword"); 
 
\t \t \t \t System.out.println("executed3"); 
 
\t \t \t \t errors.concat("confirmpasswordError&"); 
 
\t \t \t } 
 
\t \t \t if(role==null || role.isEmpty()) 
 
\t \t \t { 
 
\t \t \t \t validated = false; 
 
\t \t \t \t model.put("roleError","Please select one"); 
 
\t \t \t \t System.out.println("executed4"); 
 
\t \t \t \t errors.concat("roleError&"); 
 
\t \t \t } 
 
\t \t \t 
 
\t \t \t if(validated) 
 
\t \t \t { 
 
\t \t \t \t return "page2"; 
 
\t \t \t } 
 
\t \t \t else 
 
\t \t \t { 
 
\t \t \t \t return "redirect:login.htm?"+ errors; 
 
\t \t \t } 
 
\t \t } \t 
 
\t } 
 
}

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 
 
<%@ include file="include.jsp" %> 
 
<html> 
 
<head> 
 
<meta charset="utf-8"> 
 

 
</head> 
 

 
<body> 
 

 
<div align="center" id='formlogin' class="container"> 
 

 
<form method="post" id="loginForm" name="loginForm" action="login.htm" commandName="userForm" style="margin-bottom:30%"> 
 
\t \t <table class="tableprop" id="tableform" border="0" width="0" cellspacing="5" cellpadding="5"> 
 
\t \t 
 
\t \t <h3> Add a new user </h3> 
 
\t \t 
 
\t \t \t <tr> 
 
\t \t \t \t <td align="center">User ID:</td> 
 
\t \t \t \t <td><input tabindex="5" size="20" type="text" name="userid" id="userid" value="<%=request.getParameter("userid")!=null?request.getParameter("userid"):""%>"></td> 
 
\t \t \t \t <td><c:if test="${param.useridError != null}"> 
 
\t \t \t \t \t \t <div id="error" class="alert alert-danger"> 
 
\t \t \t \t \t \t  <font color="red"><p>Invalid UserId</p></font> 
 
\t \t \t \t \t \t </div></c:if></td> 
 
\t \t \t </tr> 
 
\t \t \t 
 
\t \t \t <tr> 
 
\t \t \t \t <td align="center">Password:</td> 
 
\t \t \t \t <td><input tabindex="5" size="20" type="password" name="password" id="password" value="<%=request.getParameter("password")!=null?request.getParameter("password"):""%>"></td> 
 
\t \t \t \t <td><c:if test="${param.passwordError != null}"> 
 
\t \t \t \t \t \t <div class="alert alert-danger"> 
 
\t \t \t \t \t \t <font color="red"><p align="inline" class="err">Incorrect Password</p></font> 
 
\t \t \t \t \t \t </div></c:if></td> 
 
\t \t \t </tr> 
 
\t \t \t 
 
\t \t \t <tr> 
 
\t \t \t \t <td align="center">Confirm Password:</td> 
 
\t \t \t \t <td><input tabindex="5" size="20" type="password" name="confirmpassword" id="confirmpassword" value="<%=request.getParameter("confirmpassword")!=null?request.getParameter("confirmpassword"):""%>"></td> 
 
\t \t \t \t \t <td><c:if test="${param.confirmpasswordError != null}"> 
 
\t \t \t \t \t \t <div class="alert alert-danger"> 
 
\t \t \t \t \t <font color="red"><p>Password should be same as above</p></font> 
 
\t \t \t \t \t \t </div></c:if></td> 
 
\t \t \t </tr> 
 
\t \t \t 
 
\t \t \t <tr> 
 
\t \t \t \t <td align="center">Role:</td> 
 
\t \t \t \t <td><select name="role" id="role" title="Please select role" tabindex="5" value="<%=request.getParameter("role")!=null?request.getParameter("role"):""%>"></td> 
 
\t \t \t \t \t <option value="">Select a specific role</option> 
 
\t \t \t \t \t <option value="OPS(Operational)">OPS(Operational)</option> 
 
\t \t \t \t \t <option value="Helpdesk">Helpdesk</option> 
 
\t \t \t \t \t </td> 
 
\t \t \t \t \t <td><c:if test="${param.roleError != null}"> 
 
\t \t \t \t \t \t <div class="alert alert-danger"> 
 
\t \t \t \t \t \t  <font color="red"><p>Please select one</p></font> 
 
\t \t \t \t \t \t </div></c:if></td> 
 
\t \t \t \t \t </select> \t 
 
\t \t \t </tr> 
 
\t \t \t 
 
\t \t \t <input type="hidden" name="${_csrf.parameterName}" value="${_csrf.token}" /> 
 
\t \t \t 
 
\t \t \t <tr> 
 
\t \t \t \t <td align="center" colspan="4"><input tabindex="7" type="submit" value="Submit" id="submit" class="submit"/></td> \t \t \t \t \t 
 
\t \t \t </tr> 
 

 
\t \t \t </table> \t \t \t \t 
 
\t \t </form> 
 
\t </div> 
 
<script> 
 
\t // just for the demos, avoids form submit 
 
\t jQuery.validator.setDefaults({ 
 
\t debug: true, 
 
\t success: "valid" 
 
\t }); 
 
</script> 
 
</body> 
 
</html>

這兩個是login.jsp和LoginController.java 1）我想要的文本值應保持的代碼，因爲它是後提交按鈕點擊。假設用戶輸入了錯誤的密碼，並且他點擊了提交按鈕，所以用戶ID不應該消失。用戶標識應保持原樣，並且密碼錯誤。我已經在jsp中爲每個字段添加了值= "<%=request.getParameter("userid")!=null?request.getParameter("userid"):""%>">。但是這不起作用，因爲在控制器中進行驗證。

2）在LoginController.java文件中，我有驗證哪些不起作用。如何解決它們？這是服務器端驗證。我有jQuery中的客戶端驗證。

來源

2015-10-19 rucha

我認爲支撐豆的使用會更有幫助， bindingResult.hasError（）可以用來做任何事情，如果出現錯誤，並且後臺bean將負責爲你保留值 – flipper

它是可以的。 1）但是我不能在上面的代碼中進行更改嗎？我是否需要更改整個代碼？我不知道什麼是支持豆類。 2）請給我任何與我的代碼有關的相關鏈接嗎？我更喜歡第一個問題的答案。 – rucha

希望這個論壇的討論將幫助你http://bytes.com/topic/java/answers/867692-how-retain-username-text-box – flipper

您可以將控制器中收到的所有屬性添加到會話屬性中，以便您的屬性和值將保留在login.jsp中。

在Spring參考此鏈接，使用@SessionAttributes

http://www.intertech.com/Blog/understanding-spring-mvc-model-and-session-attributes/

或者，你可以使用Spring表單支持對象，並將其存儲在會話

參考，此鏈接，使用彈簧表單支持對象

http://www.tutorialspoint.com/spring/spring_mvc_form_handling_example.htm

來源

2015-10-19 07:56:04 Prem

好的，謝謝你，先生，會嘗試使用這兩個鏈接。 – rucha

如果您發現此解決方案有幫助，敬請投票！ – Prem

對不起，先生。我無法做到這一點，因爲我沒有贏得總共15個聲譽。 – rucha

如何保持文本值，因爲它是後點擊提交按鈕

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