Springmvc controller和jsp页面传值对象类型问题和普通问题

时间：2021-03-19 16:11:20

一:JSP-->controller

1.当jsp页面传递的值是对象类型时候比如User.name User.age的user对象传递,需要以下操作

jsp页面提供对应标签的value必须存在且合法,name属性只能是对象的具体属性名,不需要写成对象.属性名的形式,例如:

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>

<!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>Insert title here</title>

<script type="text/javascript"

    src="<%=request.getContextPath()%>/js/jquery-1.8.3.min.js"></script>

<script type="text/javascript">

    $(function() {

        $("#prev").click(

                function() {

                    $("#form0").attr("action",

                            "${pageContext.request.contextPath}/user/prev.do");

                    var currentPage = $("#currentPage").val() - 1;

                    $("#currentPage").val(currentPage);

                    alert($("#currentPage").val());

                    $("#form0").submit();

                })

        $("#next").click(

                function() {

                    $("#form0").attr("action",

                            "${pageContext.request.contextPath}/user/next.do");

                    $("#form0").submit();

                })

    })

</script>

</head>

<body>

    <form id="form0" method="POST">

        <table border="1">

            <thead>

                <tr>

                    <td width="60px">id</td>

                    <td width="120px">name</td>

                    <td width="60px">age</td>

                </tr>

            </thead>

            <tbody>

                <c:forEach var="user" items="${userList}" varStatus="status">

                    <tr>

                        <td>${user.id}</td>

                        <td>${user.userName}</td>

                        <td>${user.age}</td>

                    </tr>

                </c:forEach>

                <tr>

                    <td><c:if test="${pageTableForm.currentPage > 1}">

                            <input id="prev" type="button" value="上一页">

                        </c:if></td>

                    <td>当前<label>${pageTableForm.currentPage}</label>页/共<label>${pageTableForm.pageCount}</label>页</td>

                    <td><c:if test="${pageTableForm.currentPage < pageTableForm.pageCount}">

                            <input id="next" type="button" value="下一页">

                        </c:if></td>

                </tr>

            </tbody>

        </table>

        <input id="currentPage" type="text" name="currentPage" value="${pageTableForm.currentPage}">

    </form>

</body>

</html>

这里的

<input id="currentPage" type="text" name="currentPage" value="${pageTableForm.currentPage}">

我自己定义的一个封装属性的javabean对象PageTableForm,用来存放表单内容,个人习惯别较真儿

package com.mi.form;

public class PageTableForm {

    private int currentPage;// 当前页

    private int pageSize = 3;// 每页记录数

    private int beginIndex;// 开始位置

    private int endIndex;// 结束位置

    private int pageCount;// 共多少页

    private int userCount;// 共多少条记录

    ...

省略get set

}

此时的value="${pageTableForm.currentPage}"的值为一个int类型且存在的数字,提交表单后到对应的requestmapping的方法中,代码如下

package com.mi.controller;

import java.util.List;

import javax.servlet.http.HttpServletRequest;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.web.bind.annotation.RequestMapping;

import com.mi.entity.User;

import com.mi.form.PageTableForm;

import com.mi.service.impl.UserInfoServiceImpl;

@Controller

@RequestMapping("/user")

public class UserInfoCotroller {

    @Autowired

    private UserInfoServiceImpl userInfoServiceImpl;

    private PageTableForm pageTableForm;

    @RequestMapping("/init")

    public String init(){

        pageTableForm = new PageTableForm();

        return "redirect:/user/query.do";

    }

    @RequestMapping("/query")

    public String queryUserInfo(Model model,HttpServletRequest request) {

        pageTableForm = getOperation();

        List<User> userList = userInfoServiceImpl.queryUserInfo(pageTableForm.getBeginIndex(), pageTableForm.getEndIndex());

        model.addAttribute("userList", userList);

        model.addAttribute("pageTableForm", pageTableForm);

        return "userInfo";

    }

    public PageTableForm getOperation() {

        if (pageTableForm.getCurrentPage() == 0)

            pageTableForm.setCurrentPage(1);

        pageTableForm.setUserCount(getCount());

        if (pageTableForm.getUserCount() % 3 == 0) {

            pageTableForm.setPageCount(pageTableForm.getUserCount() / pageTableForm.getPageSize());

        } else {

            pageTableForm.setPageCount(pageTableForm.getUserCount() / pageTableForm.getPageSize() + 1);

        }

        pageTableForm.setBeginIndex(pageTableForm.getCurrentPage() * 3 - 3);

        pageTableForm.setEndIndex(pageTableForm.getCurrentPage() * 3);

        return pageTableForm;

    }

    @RequestMapping("/prev")

    public String pagePrev(Model model,HttpServletRequest request,PageTableForm pageTableForm) {

        System.out.println(request.getParameter("currentPage"));

        System.out.println(pageTableForm.getCurrentPage());

        int currentPage = pageTableForm.getCurrentPage()-1;

        pageTableForm.setCurrentPage(currentPage);

        return "redirect:/user/query.do";

    }

    @RequestMapping("/next")

    public String pageNext(Model model) {

        int currentPage = pageTableForm.getCurrentPage()+1;

        pageTableForm.setCurrentPage(currentPage);

        return "redirect:/user/query.do";

    }

    public int getCount() {

        return userInfoServiceImpl.getCount();

    }

    public UserInfoServiceImpl getUserInfoServiceImpl() {

        return userInfoServiceImpl;

    }

    public void setUserInfoServiceImpl(UserInfoServiceImpl userInfoServiceImpl) {

        this.userInfoServiceImpl = userInfoServiceImpl;

    }

    public PageTableForm getPageTableForm() {

        return pageTableForm;

    }

    public void setPageTableForm(PageTableForm pageTableForm) {

        this.pageTableForm = pageTableForm;

    }

}

红色部分就是提交的方法,可以看出在方法参数中要声明一下对象,这里我为了是实验比较数据传到后台是否正确,所以使用了2中方法--request.getParamter()和直接使用对象.get...方法,得出结果如下所示,

Springmvc controller和jsp页面传值对象类型问题和普通问题

我点击上一页,页面alert一个跳转页面的页码,现在是从第二页翻到第一页,所以是1,这样我们后台2次正确的情况应该也都是1(日语操作系统,别在意这些,不是乱码)

Springmvc controller和jsp页面传值对象类型问题和普通问题

多点了一次,别在意这些,重点是后台获取的数据就是前台我们想要的

2.当jsp->后台是普通数据的时候,实际项目中这种情况不多,但是还是总结一下

暂时挂起,关于这些我想等到实际用到时再列,上1中已经列了一种方法,另外就是利用注解去值

页面如下

<form action="login2" method="post">

          用户：<input type="text" name="name"><br><br>

          密码：<input type="text" name="password"><br><br>

        <input type="submit" value="确定">

</form>

普通数据(非对象)的数据有2种方法传递到后台,request获取+注解版的request

1):request获取

/**

     * 使用HttpServletRequest获取

     */

    @RequestMapping("/login1")

    public String login1(HttpServletRequest request,Model model){

        model.addAttribute("name", request.getParameter("name"));

        model.addAttribute("password", request.getParameter("password"));

        return "success";

    }

2):注解版的request

 /**

     * spring自动将表单参数注入到方法参数,参数值和页面name属性一致时可以省去@RequestParam注解

     */

    @RequestMapping("/login2")

    public String login2(@RequestParam("name") String name, String password,Model model){

        model.addAttribute("name", name);

        model.addAttribute("password", password);

        return "success";

    }

实体类User不再列出了Springmvc controller和jsp页面传值对象类型问题和普通问题

二:controller-->JSP

有2中办法(实际更多,不过存在重复嫌疑列举常用的就好),用model+用map

1):利用model对象添加数据到属性中,页面可以使用EL表达式获取

    @RequestMapping("/init")

    public String init(){

        pageTableForm = new PageTableForm();

        return "redirect:/user/query.do";

    }

    @RequestMapping("/query")

    public String queryUserInfo(Model model,HttpServletRequest request) {

        pageTableForm = getOperation();

        List<User> userList = userInfoServiceImpl.queryUserInfo(pageTableForm.getBeginIndex(), pageTableForm.getEndIndex());

        model.addAttribute("userList", userList);

        model.addAttribute("pageTableForm", pageTableForm);

        return "userInfo";

    }

JSP:

<form id="form0" method="POST">

        <table border="1">

            <thead>

                <tr>

                    <td width="60px">id</td>

                    <td width="120px">name</td>

                    <td width="60px">age</td>

                </tr>

            </thead>

            <tbody>

                <c:forEach var="user" items="${userList}" varStatus="status">

                    <tr>

                        <td>${user.id}</td>

                        <td>${user.userName}</td>

                        <td>${user.age}</td>

                    </tr>

                </c:forEach>

                <tr>

                    <td><c:if test="${pageTableForm.currentPage > 1}">

                            <input id="prev" type="button" value="上一页">

                        </c:if></td>

                    <td>当前<label>${pageTableForm.currentPage}</label>页/共<label>${pageTableForm.pageCount}</label>页</td>

                    <td><c:if test="${pageTableForm.currentPage < pageTableForm.pageCount}">

                            <input id="next" type="button" value="下一页">

                        </c:if></td>

                </tr>

            </tbody>

        </table>

        <input id="currentPage" type="text" name="currentPage" value="${pageTableForm.currentPage}">

    </form>

2):使用map方式设值,JSP同上不再列出

@RequestMapping("/login4")

    public String login4(User user, Map<String, Object> map){

        map.put("name", user.getName());

        map.put("password", user.getPassword());

        return "success";

    }

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