[Spring MVC]

Spring MVC自带的表单标签比较简单，很多时候需要借助EL和JSTL来完成。

下面是一个比较简单的表单提交页面功能：

1、User model

package com.my.controller.bean;

import java.util.Date;
import java.util.List;

import javax.validation.constraints.Future;
import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import javax.validation.constraints.NotNull;

import org.hibernate.validator.constraints.Email;
import org.hibernate.validator.constraints.Length;
import org.hibernate.validator.constraints.NotEmpty;

public class User {
    
    private long id;
    
    @Length(min=2, max=50, message="User name length range = 2-50")
    private String name;
    
    @Future(message="时间不能小于今天")
    private Date createTime;
    
    @NotEmpty(message="Customer不能为空")
    private List<Customer> customers;
    
    @NotNull(message="Girl不能为空")
    private boolean girl;
    
    private String[] cbx;
    
    @NotNull(message="Age can NOT be Null")
    @Min(value=18, message="最小18岁")
    @Max(value=100, message="最大100岁")
    private int age;
    
    @Email(message="Email格式不正确")
    private String email;
    
    public long getId() {
        return id;
    }
    public void setId(long id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public Date getCreateTime() {
        return createTime;
    }
    public void setCreateTime(Date createTime) {
        this.createTime = createTime;
    }
    public List<Customer> getCustomers() {
        return customers;
    }
    public void setCustomers(List<Customer> customers) {
        this.customers = customers;
    }
    public boolean isGirl() {
        return girl;
    }
    public void setGirl(boolean girl) {
        this.girl = girl;
    }
    public String[] getCbx() {
        return cbx;
    }
    public void setCbx(String[] cbx) {
        this.cbx = cbx;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }

}

2、Controller

package com.my.controller;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import javax.validation.Valid;

import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.servlet.ModelAndView;

import com.my.controller.bean.Customer;
import com.my.controller.bean.User;

@Controller
@RequestMapping(value="/post")
public class TestPostController {
    
    private static List<User> users = new ArrayList<User>();
    {
        //-----------------------------------------------
        // 设置Entity
        // -----------------------------------------------
        users.add(new User());
        User user = users.get(0);
        user.setId(1);
        user.setName("Robin");
        user.setCreateTime(new Date());
        user.setGirl(true);
        user.setCbx(new String[] {"1", "2", "3"});
        user.setAge(18);
        user.setEmail("abcd@abc.com");
        
        user.setCustomers(new ArrayList<Customer>());
        Customer customer1 = new Customer();
        customer1.setId(1);
        customer1.setCompany("Company - 1");
        customer1.setCreateTime(new Date());
        customer1.setUser(user);
        user.getCustomers().add(customer1);
        
        Customer customer2 = new Customer();
        customer2.setId(1);
        customer2.setCompany("Company - 2");
        customer2.setCreateTime(new Date());
        customer2.setUser(user);
        user.getCustomers().add(customer2);
    }
    
    @RequestMapping
    public ModelAndView index() {
        ModelAndView view = new ModelAndView("TestPost/index");
        view.addObject("users", users);
        return view;
    }
    
    @RequestMapping(value="/addUser", method=RequestMethod.POST)
    public ModelAndView addUser(@ModelAttribute @Valid User user, BindingResult result) {
        ModelAndView view = new ModelAndView("redirect:/post");
        
        if(result.hasErrors()) {
            List<FieldError> errors = result.getFieldErrors();
            for(FieldError err : errors) {
                System.out.println("ObjectName:" + err.getObjectName() + "	FieldName:" + err.getField()
                        + "	FieldValue:" + err.getRejectedValue() + "	Message:" + err.getDefaultMessage());
            }
            view.addObject("users", users);
            return view;
        }
        
        user.setId(users.size() + 1);
        user.getCustomers().get(0).setId(1);
        user.getCustomers().get(0).setUser(user);
        users.add(user);
        view.addObject("users", users);
        return view;
    }
    
}

3、View

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ page import="com.my.controller.bean.*" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %> 
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/functions" prefix="fn" %>
<%@ taglib prefix="st" uri="http://www.springframework.org/tags" %>
<%@ taglib uri="http://www.springframework.org/tags/form" prefix="sf" %>

<!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>Index</title>
</head>
<body>
    <fmt:setLocale value="zh_cn" />
    <form action="<st:url value="/post/addUser"></st:url>" method="post">
        <c:forEach items="${users}" var="user">
            User:${user.name}<br/>
            Create time:<fmt:formatDate value="${user.createTime}"/><br/>
            Is girl:
            <c:choose>
                <c:when test="${user.girl}">Yes</c:when>
                <c:when test="${!user.girl}">No</c:when>
                <c:otherwise>N/A</c:otherwise>
            </c:choose>
            <br/>
            Checkboxs:
            <c:forEach items="${user.cbx}" var="item">
                ${item},
            </c:forEach>
            <br/>
            Age:${user.age}<br/>
            E-mail:${user.email}<br/>
            <hr/>
        
            <table style="100%;border:1px solid #ccc;">
                <thead>
                    <tr style="text-align:left; background-color:#eee;">
                        <th>Company name</th>
                        <th>User</th>
                        <th>Create time</th>
                    </tr>
                </thead>
                <tbody>
                    <c:forEach items="${user.customers}" var="item">
                    <tr>
                        <td>${item.company}</td>
                        <td>${item.user.name}</td>
                        <td><fmt:formatDate value="${item.createTime}" pattern="yyyy-MM-dd"/></td>
                    </tr>
                    </c:forEach>
                </tbody>
            </table>
            <hr/>
        </c:forEach>
        
        User name:
        <input type="text" name="name" id="name" /><br/>
        Is girl:
        <input type="radio" name="girl" id="isGirl" value="true" checked="checked" /><label for="isGirl">Yes</label>
        <input type="radio" name="girl" id="noGirl" value="false" /><label for="noGirl">No</label><br/>
        Checkboxs:
        <input type="checkbox" name="cbx" id="cbx1" value="1" /><label for="cbx1">1</label>
        <input type="checkbox" name="cbx" id="cbx2" value="2" /><label for="cbx2">2</label>
        <input type="checkbox" name="cbx" id="cbx3" value="3" /><label for="cbx3">3</label>
        <br/>
        Age:<input type="text" name="age" id="age" /><br/>
        E-mail:<input type="text" name="email" id="email" /><br/>
        Create time:
        <input type="text" name="createTime" id="createTime" /><br/>
        Company:
        <input type="text" name="customers[0].company" id="customers[0].company" /><br/>
        <input type="submit" value="add" />
        <sf:errors path="*"></sf:errors>
    </form>
    <hr/>
</body>
</html>

4、测试结果