SpringMVC获取表单数据（radio和checkbox）

Bertha 。 2022-05-14 05:20 174阅读 0赞

### 1、实体类 ###

package cn.hadron.bean;
    
    import java.io.Serializable;
    import java.util.Arrays;
    
    /**
     * create table users(
         id int auto_increment primary key,
         username varchar(45),
         password varchar(45),
         age int default 0
       );
       insert into users(username,password,age) values('hadron','123',18);
     * @author chengyq
     *
     */
    
    // 域对象，实现序列化接口
    public class UserBean implements Serializable {
        
    
        private Integer id;
        private String username;
        private String password;
        private String birthday;
        private Integer age;
        //测试单选按钮
        private String sex;
        //测试复选按钮
        private String[] favorite;
    
        public UserBean() {}
        public UserBean(String username, String password,int age) {
            this.username = username;
            this.password = password;
            this.age=age;
        }
        public UserBean(String username, String birthday,String sex) {
            this.username = username;
            this.birthday = birthday;
            this.sex=sex;
        }
        public Integer getId() {
            return id;
        }
        public String getUsername() {
            return username;
        }
        public String getPassword() {
            return password;
        }
        public Integer getAge() {
            return age;
        }
        public void setId(Integer id) {
            this.id = id;
        }
        public void setUsername(String username) {
            this.username = username;
        }
        public void setPassword(String password) {
            this.password = password;
        }
        public void setAge(Integer age) {
            this.age = age;
        }
        public String getSex() {
            return sex;
        }
    
        public void setSex(String sex) {
            this.sex = sex;
        }
        public String[] getFavorite() {
            return favorite;
        }
    
        public void setFavorite(String[] favorite) {
            this.favorite = favorite;
        }
    
        public String getBirthday() {
            return birthday;
        }
    
        public void setBirthday(String birthday) {
            this.birthday = birthday;
        }
    
        @Override
        public String toString() {
            return "UserBean{" +
                    "id=" + id +
                    ", username='" + username + '\'' +
                    ", password='" + password + '\'' +
                    ", birthday='" + birthday + '\'' +
                    ", age=" + age +
                    ", sex='" + sex + '\'' +
                    ", favorite=" + Arrays.toString(favorite) +
                    '}';
        }
    }

### 2、控制器 ###

package cn.hadron.controller;
    
    import cn.hadron.bean.UserBean;
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.ModelAttribute;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    
    import java.util.ArrayList;
    import java.util.List;
    
    @Controller
    @RequestMapping(value = "/f")
    public class FormController {
    
        @RequestMapping(value="/getEditPage",method= RequestMethod.GET)
        public String getEditPage(Model model) {
            System.out.println("表单测试");
            UserBean user = new UserBean("jack","1997-7-1","女");
            // model中添加属性user，值是user对象
            model.addAttribute("user",user);
            //返回Edit.jsp页面
            return "edit";
        }
    
        @RequestMapping(value="/edit",method=RequestMethod.POST)
        public String edit(@ModelAttribute UserBean user,Model model) {
            System.out.println("获取表单数据：");
            //@ModelAttribute注解指示了参数应该从模型（这里所说的“模型”指 Model）中获取
            model.addAttribute("username", user.getUsername());
            model.addAttribute("birthday", user.getBirthday());
            model.addAttribute("sex", user.getSex());
            model.addAttribute("favorite", user.getFavorite());
            System.out.println("user="+user);
            //返回userPage.jsp页面
            return "userPage";
        }
    
        /**
         * 可以用@ModelAttribute注解的方法做一些初始化操作。
         * 当同一个controller中有多个方法被@ModelAttribute注解标记，
         * 所有被@ModelAttribute标记的方法均会被执行，按先后顺序执行，然后再进入请求的方法
         * @return
         */
        @ModelAttribute("webList")
        public List<String> getWebList() {
            List<String> webList = new ArrayList<String>();
            webList.add("SpringMVC");
            webList.add("SpringBoot");
            webList.add("SpringCloud");
            return webList;
        }
    }

### 3、页面 ###

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
    <%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
    <!DOCTYPE html>
    <html>
    <head>
    <meta charset="UTF-8">
    <title>测试form标签</title>
    </head>
    <body>
    <h3>用户信息编辑页面</h3>
    <form:form modelAttribute="user" method="post" action="/elastic/f/edit.do" >
        <table>
            <tr>
                <td>姓名:</td>
                <td><form:input path="username"/></td>
            </tr>
            <tr>
                <td>性别:</td>
                <td>
                    <form:radiobutton path="sex" value="男" label="男" />
                    <form:radiobutton path="sex" value="女" label="女" />
                </td>
            </tr>
            <tr>
                <td>生日:</td>
                <td><form:input path="birthday"/></td>
            </tr>
            <tr>
                <td>爱好:</td>
                <td><form:checkboxes items="${webList}" path="favorite" /></td>
            </tr>
            <tr>
                <td colspan="2">
                    <input type="submit" value="提交变更"/>
                </td>
            </tr>
        </table>
    </form:form>
    </body>
    </html>

![这里写图片描述][70]

<%--
      Created by IntelliJ IDEA.
      User: chengyq
      Date: 2018/9/3
      Time: 14:27
      To change this template use File | Settings | File Templates.
    --%>
    <%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
    <%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
    <html>
    <head>
        <title>Title</title>
    </head>
    <body>
    <h2>您提交的用户信息</h2>
    <table>
        <tr>
            <td>Username</td>
            <td>${username}</td>
        </tr>
        <tr>
            <td>Birthday</td>
            <td>${birthday}</td>
        </tr>
        <tr>
            <td>Sex</td>
            <td>${sex}</td>
        </tr>
        <tr>
            <td>favorite</td>
            <td>
                <%
                    String[] favorite = (String[])request.getAttribute("favorite");
                    for(String f: favorite) {
                        out.println(f);
                    }
                %>
            </td>
        </tr>
    </table>
    </body>
    </html>

![这里写图片描述][70 1]

[70]: /images/20220514/ba9b9352e1cc4b869f420bae26082f77.png
[70 1]: /images/20220514/3e0bcc51b10a435dabf8ce056c9d7b74.png