Question

我遇到将变量从JSP站点传递到mvc控制器的问题。下面你可以看到我的JSP页面和相应的mvc控制器。我设法获取数据，但我的目的是将用户在网站上输入的数据插入数据库并在其他网站上显示。我设法得到了vaariables的值，但是第一次打开网站时，它们被设置为null，这会导致我的sql查询崩溃。有没有办法在我点击提交按钮时将值设置为变量？此外，当我尝试使if取消空值时（如下面的代码中所示），我得到以下错误：

ERROR

There was an unexpected error (type=Internal Server Error, status=500).
No message available

addCustomer.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Add Customer</title>
</head>
<body>
    <body>
    <form:form method="GET" action="addCustomer" commandName="Residents">
        <div align="center">
            <h2> Add Customer </h2>
            <table>
                <tr>
                    <td>First Name</td>
                    <td><input type="text" name="name" /></td>

                </tr>
                <tr>
                    <td>Surame</td>
                    <td><input type="text" name="surname" /></td>
                </tr>
                <tr>
                    <td>Check in Date</td>
                    <td><input type="date" name="checkInDate"</td>
                </tr>
                <tr>
                    <td>Check out Date</td>
                    <td><input type="date" name="checkOutDate"</td>
                </tr>

                <tr>
                    <td>Email</td>
                    <td><input type="email" name="email"></td>
                </tr>

                <tr>
                    <td>Id</td>
                    <td><input type="number" name="residentId"></td>
                </tr>

                <tr>
                    <td>Room ID</td>
                    <td><input type="number" name="roomId"</td>


                </tr>
                <tr>
                    <td></td>
                    <td><input type="submit" value="send" /></td>
                    <td/>
                    <td><input type="submit" value="Cancel"/></td>
                </tr>

            </table>
            <div style="color: red">${error}</div>
        </div>
    </form:form>
</body>
</html>

Residents.java

package com.stapor.bartlomiej.Model;

import java.sql.Date;

/**
 * Created by Bartek on 2017-07-30.
 */
public class Residents {
    private String name;
    private String surname;
    private Date checkInDate;
    private Date checkOutDate;
    private String email;
    private int id;
    private int roomId;

    public Residents(int id, String name, String surname, Date checkInDate, Date checkOutDate, String email, int roomId) {
        this.name = name;
        this.surname = surname;
        this.checkInDate = checkInDate;
        this.checkOutDate = checkOutDate;
        this.email = email;
        this.id = id;
        this.roomId = roomId;
    }

    public Residents(String name, String surname, Date checkInDate, Date checkOutDate, String email, int roomId) {
        this.name = name;
        this.surname = surname;
        this.checkInDate = checkInDate;
        this.checkOutDate = checkOutDate;
        this.email = email;
        this.roomId = roomId;
    }

    public Residents() {
    }


    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSurname() {
        return surname;
    }

    public void setSurname(String surname) {
        this.surname = surname;
    }

    public Date getCheckInDate() {
        return checkInDate;
    }

    public void setCheckInDate(Date checkInDate) {
        this.checkInDate = checkInDate;
    }

    public Date getCheckOutDate() {
        return checkOutDate;
    }

    public void setCheckOutDate(Date checkOutDate) {
        this.checkOutDate = checkOutDate;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public int getRoomId() {
        return roomId;
    }

    public void setRoomId(int roomId) {
        this.roomId = roomId;
    }

    @Override
    public String toString() {
        return String.format(
                "Id: %d<br>Name: %s<br>Surname: %s<br>Check In Date: %s<br>Check Out Date: %s<br>E-mail: %s<br>Room ID: %d<br>",
                id, name, surname, checkInDate, checkOutDate, email, roomId);


    }
}

MVC控制器

@RequestMapping(value = "/addCustomer", method = RequestMethod.GET)
    public String addCustomer(@ModelAttribute("Residents") Residents residents, HttpServletRequest request)
    {

        //System.out.println(name + "\n" + surname + "\n" + checkInDate + "\n" + checkOutDate + "\n" + email + "\n" + residentId + "\n" + roomId);

            //System.out.println(request.getParameter("checkInDate"));
            String[] params = {request.getParameter("checkInDate"),
                    request.getParameter("checkOutDate"),
                    request.getParameter("name"),
                    request.getParameter("surname"),
                    request.getParameter("residentId"),
                    request.getParameter("email"),
                    request.getParameter("roomId")
            };
            for(String k : params)
            {
                System.out.println(k);
            }

            if(params[0].isEmpty())
            {
                System.out.println("shiet");
            }
            else
            {
                String sql = "insert into residents(Check_in_Date, Check_out_Date, Name, Surname, ResidentId, email, roomId) values " +
                        "('" + params[0] + "', '" + params[1] +
                        "', '" + params[2] + "', '" + params[3] + "', '" +
                        params[4] + "', '"  + params[5] + "', " + params[5] + ");";
                jdbcTemplate.batchUpdate(sql);
            }

        //System.out.println("" + request.getParameter("name"));
      //  map.put("residents", residents);
       // map.put("name", request.getParameter("name"));

        return "addCustomer";
    }

从GET更改为POST无法解决问题。错误代码如下：

There was an unexpected error (type=Internal Server Error, status=500).
StatementCallback; SQL [insert into residents(Check_in_Date, Check_out_Date, Name, Surname, ResidentId, email, roomId) values ('null', 'null', 'null', 'null', 'null', 'null', null);]; Cannot parse "DATE" constant "null"; SQL statement: insert into residents(Check_in_Date, Check_out_Date, Name, Surname, ResidentId, email, roomId) values ('null', 'null', 'null', 'null', 'null', 'null', null) -- ('null', 'null', 'null', 'null', 'null', 'null', NULL) [22007-191]; nested exception is org.h2.jdbc.JdbcBatchUpdateException: Cannot parse "DATE" constant "null"; SQL statement: insert into residents(Check_in_Date, Check_out_Date, Name, Surname, ResidentId, email, roomId) values ('null', 'null', 'null', 'null', 'null', 'null', null) -- ('null', 'null', 'null', 'null', 'null', 'null', NULL) [22007-191]

Answer 1

在addCustomer.jsp页面中使用Post方法

<form:form method="POST" action="addCustomer" commandName="Residents">

然后在您的Controller类中，请注意@ModelAttribute将使用相应的addCustomer.jsp类属性自动绑定您的Residents表单元素属性值。所以你不必做所有request.getParameter("checkOutDate")。 Spring已经完成了这项工作，只需将@ModelAttribute("Residents") Residents residents作为参数传递给addCustomer方法，就像你正确做的那样。

所以请继续检索这样的值

@RequestMapping(value = "/addCustomer", method = RequestMethod.POST)
public String addCustomer(@ModelAttribute("Residents") Residents residents){

     //Just some printouts for confirmation
     System.out.println(residents.getName());
     System.out.println(residents.getSurname());

     //Persist data

}

Answer 2

您需要以JSP格式向所有输入标记添加<form:input path="" />。

将值从JSP传递给spring mvc控制器错误

2 个答案: