Question

我正在使用Spring MVC和Hibernate进行Crud操作。并使用JSTL作为前端。我正在显示带有相应数据库值的选中复选框。但他们不会检查我对应的数据库值是否大于一个。如果我在数据库中只有一个值，则选中相应的复选框。

我正在使用JSTL标记库和具有模型属性的映射，如下面的代码所示。

Index.html

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
        pageEncoding="ISO-8859-1"%>
    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
    <%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
    <%@taglib uri="http://www.springframework.org/tags" prefix="spring"%>
    <c:url var="resourceURL" value="/resources" />
    <!DOCTYPE html>
    <html>
    <head>
    <meta charset="ISO-8859-1">
    <title>Insert title here</title>
    <style>
    .error {
        color: red;
    }
    </style>
    </head>
    <body>
        <form:form method="post" modelAttribute="userLogin">
            <table>

                <tr>
                    <td>hobby</td>
                    <td>cricket<form:checkbox path="hobby" value="cricket" />
                        soccer<form:checkbox path="hobby" value="soccer" /> 
                        tennis<form:checkbox path="hobby" value="tennis" /> 
                        hockey<form:checkbox path="hobby" value="hockey" />
                    </td>
                    <td><form:errors path="hobby" cssClass="error" /></td>
                </tr>


                <tr>
                    <td></td>
                    <td><input type="submit" value="update"></td>
                </tr>

            </table>
        </form:form>

    </body>
    </html>

MainController.java

    package com.test.controller;

    import javax.validation.Valid;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.validation.BindingResult;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.ModelAttribute;
    import org.springframework.web.bind.annotation.PostMapping;
    import org.springframework.web.servlet.ModelAndView;
    import com.test.domain.UserLogin;
    import com.test.service.UserLoginService;


    @Controller
    public class MainController {

        @Autowired
        private UserLoginService uls;

        @GetMapping
        public String landingIndex(Model model) {
            model.addAttribute("userLogin", new UserLogin());
            return new String("index");
        }

        @PostMapping
        public String insertingValue(@ModelAttribute @Valid UserLogin userLogin01, BindingResult result) {
            if(result.hasErrors()) {
                return new String("index");
            }else {
                uls.saveUser(userLogin01);
            } 
            return new String("redirect:/home");
        }

        @GetMapping("/home")
        public ModelAndView redirectingToHome(){
            ModelAndView mv = new ModelAndView("Home");
            mv.addObject("userList",uls.fetchingUsersDetails());
            return mv;
        }

        @GetMapping("/delete")
        public String deleteUserName(@ModelAttribute UserLogin userLogin){
            uls.deletingUser(userLogin);
            return new String("redirect:/home");
        }

        @GetMapping("/update")
        public ModelAndView updateUserName(@ModelAttribute UserLogin userLogin,Model model){
            ModelAndView mv = new ModelAndView("index");
            model.addAttribute("userLogin", uls.fetchingUserDetailThroughId(userLogin));
            return mv;
        }
    }

DaoImpl.java

    package com.test.daoimpl;

    import java.util.List;

    import org.hibernate.SessionFactory;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Repository;
    import org.springframework.transaction.annotation.Transactional;
    import com.test.dao.UserLoginDao;
    import com.test.domain.UserLogin;

    @Repository
    @Transactional
    public class UserLoginDaoImpl implements UserLoginDao{

        @Autowired(required = true)
        private SessionFactory sessionFactory;

        public void saveUser(UserLogin ul) {
            sessionFactory.getCurrentSession().saveOrUpdate(ul);
        }

        @SuppressWarnings("unchecked")
        @Override
        public List<UserLogin> fetchingUsersDetails() {
            return sessionFactory.getCurrentSession().createCriteria(UserLogin.class).list();
        }

        @Override
        public void deletingUser(UserLogin ul) {
            sessionFactory.getCurrentSession().delete(ul);
        }

        @Override
        public UserLogin fetchingUserDetailThroughId(UserLogin ul) {
            return sessionFactory.getCurrentSession().get(UserLogin.class,ul.getId());
        }
    }





     **output**

在数据库中，爱好插入如下：板球，足球，曲棍球

但是在更新时，我没有任何复选框。但是如果我在数据库中只有一个爱好，那么就检查相应的数据库。

如何获取选中的复选框jstl

0 个答案: