1、在表单提交页面加入一个日期字段。<%@page import="java.util.HashMap"%><%@page import="java.util.Map"%><%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%><%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <!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></head><body> <!-- 1. WHY 使用 form 标签呢 ? 可以更快速的开发出表单页面, 而且可以更方便的进行表单值的回显 2. 注意: 可以通过 modelAttribute 属性指定绑定的模型属性, 若没有指定该属性，则默认从 request 域对象中读取 command 的表单 bean 如果该属性值也不存在，则会发生错误。 --> <form:form action="${pageContext.request.contextPath }/emp" method="POST" modelAttribute="employee"> <br> <c:if test="${employee.id == null }"> <!-- path 属性对应 html 表单标签的 name 属性值 --> LastName: <form:input path="lastName"/> </c:if> <c:if test="${employee.id != null }"> <form:hidden path="id"/> <input type="hidden" name="_method" value="PUT"/> <%-- 对于 _method 不能使用 form:hidden 标签, 因为 modelAttribute 对应的 bean 中没有 _method 这个属性 --%> <%-- <form:hidden path="_method" value="PUT"/> --%> </c:if> <br> Email: <form:input path="email"/> <br> <% Map<String, String> genders = new HashMap(); genders.put("1", "Male"); genders.put("0", "Female"); request.setAttribute("genders", genders); %> Gender: <br> <form:radiobuttons path="gender" items="${genders }" delimiter="<br>"/> <br> Department: <form:select path="department.id" items="${departments }" itemLabel="departmentName" itemValue="id"></form:select> <br> Birth: <form:input path="birth"/> <br> Salary: <form:input path="salary"/> <br> <input type="submit" value="Submit"/> </form:form> </body></html>
2、在SpringMVC控制层实现数据保存方法，并且打印employee。package com.gwolf.springmvc.handlers;import java.util.Map;import javax.validation.Valid;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.validation.Errors;import org.springframework.validation.FieldError;import org.springframework.web.bind.WebDataBinder;import org.springframework.web.bind.annotation.InitBinder;import org.springframework.web.bind.annotation.ModelAttribute;import org.springframework.web.bind.annotation.PathVariable;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RequestParam;import com.gwolf.springmvc.dao.DepartmentDao;import com.gwolf.springmvc.dao.EmployeeDao;import com.gwolf.springmvc.domain.Employee;@Controllerpublic class EmployeeHandler { @Autowired private EmployeeDao employeeDao; @Autowired private DepartmentDao departmentDao; @RequestMapping(value="/emp", method=RequestMethod.POST) public String save(Employee employee){ System.out.println("save: " + employee); employeeDao.save(employee); return "redirect:/emps"; }}
3、在我们页面执行表单提交。当我们提交数据的时候，程序出现了一个400的错误，这是因为SpringMVC进行日期转化的时候没有告诉日期格式怎么转化。
4、修改实体类对象，给日期字段加上氆尧彻性@DateTimeFormat注解说明。package com.gwolf.springmvc.do罪焐芡拂main;import java.util.Date;import javax.validation.constraints.Past;import org.hibernate.validator.constraints.Email;import org.hibernate.validator.constraints.NotEmpty;import org.springframework.format.annotation.DateTimeFormat;import org.springframework.format.annotation.NumberFormat;public class Employee { private Integer id; @NotEmpty private String lastName; @Email private String email; //1 male, 0 female private Integer gender; private Department department; @Past @DateTimeFormat(pattern="yyyy-MM-dd") private Date birth; @NumberFormat(pattern="#,###,###.#") private Float salary; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getLastName() { return lastName; } public void setLastName(String lastName) { this.lastName = lastName; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } public Integer getGender() { return gender; } public void setGender(Integer gender) { this.gender = gender; } public Department getDepartment() { return department; } public void setDepartment(Department department) { this.department = department; } public Date getBirth() { return birth; } public void setBirth(Date birth) { this.birth = birth; } public Float getSalary() { return salary; } public void setSalary(Float salary) { this.salary = salary; } @Override public String toString() { return "Employee [id=" + id + ", lastName=" + lastName + ", email=" + email + ", gender=" + gender + ", department=" + department + ", birth=" + birth + ", salary=" + salary + "]"; } public Employee(Integer id, String lastName, String email, Integer gender, Department department) { super(); this.id = id; this.lastName = lastName; this.email = email; this.gender = gender; this.department = department; } public Employee() { // TODO Auto-generated constructor stub }}
5、在SpringMVC中加上如下配置，这两个配置一定要按顺序配置，不然可能会有问题。<mvc:default-servlet-handler/> <mvc:annotation-driven></mvc:annotation-driven>
6、再次提交表单数据，查看我们的日期是否能够正确转化。
7、当类型转化出现异常的时候，我们可以通过BindingResult得到错误结果。
