SpringMVC + Spring + MyBatis 学习笔记：提交数据遭遇基础类型和日期类型报400错误解决方法

系统：WIN8.1

数据库：Oracle 11GR2

开发工具：MyEclipse 8.6

框架：Spring3.2.9、SpringMVC3.2.9、MyBatis3.2.8

使用SpringMVC开发的时候，页面如果有日期格式的数据，后台接受也是java.util.Date，则报告400错误。下面是解决方案的演示示例：

这个是实体类，里面createDate就是java.util.Date类型

 1 import java.util.Date; 2  3 public class User { 4  5     private int userId; 6     private String userName; 7     private Date createDate; 8      9     public User() {}10 11     public User(int userId, String userName, Date createDate) {12         super();13         this.userId = userId;14         this.userName = userName;15         this.createDate = createDate;16     }17 18     public User(String userName, Date createDate) {19         super();20         this.userName = userName;21         this.createDate = createDate;22     }23 24     public int getUserId() {25         return userId;26     }27 28     public void setUserId(int userId) {29         this.userId = userId;30     }31 32     public String getUserName() {33         return userName;34     }35 36     public void setUserName(String userName) {37         this.userName = userName;38     }39 40     public Date getCreateDate() {41         return createDate;42     }43 44     public void setCreateDate(Date createDate) {45         this.createDate = createDate;46     }47 48     @Override49     public String toString() {50         return "User [createDate=" + createDate + ", userId=" + userId51                 + ", userName=" + userName + "]";52     }53 }

页面代码

1 　　<form action="regUser" method="post">2         userName:<input type="text" name="userName"/><br>3         createDate:<input type="text" name="createDate"/><br>4         double类型:<input type="text" name="dd"/><br>5         <input type="submit" value="注册">6     </form>

因为对于原生基本类型的form表单绑定，会出错。需要指定具体的类型编辑器。用法如下：首先在BaseController中增加方法initBinder，并使用注解@InitBinder标注，那么spring mvc在绑定表单之前，都会先注册这些编辑器。剩下的控制器都继承该类。CustomDateEditor spring自己已经提供了。代码如下：

 1 import java.text.SimpleDateFormat; 2 import java.util.Date; 3  4 import org.springframework.beans.propertyeditors.CustomDateEditor; 5 import org.springframework.stereotype.Controller; 6 import org.springframework.web.bind.WebDataBinder; 7 import org.springframework.web.bind.annotation.InitBinder; 8  9 import sun.beans.editors.DoubleEditor;10 import sun.beans.editors.FloatEditor;11 import sun.beans.editors.IntEditor;12 import sun.beans.editors.LongEditor;13 14 @Controller15 public class BaseController {16 17     @InitBinder    18     public void initBinder(WebDataBinder binder) {    19 20         binder.registerCustomEditor(Date.class, new CustomDateEditor(new SimpleDateFormat("yyyy-MM-dd"), true)); 21         binder.registerCustomEditor(int.class, new IntEditor());22         binder.registerCustomEditor(long.class, new LongEditor());  23         binder.registerCustomEditor(double.class, new DoubleEditor());  24         binder.registerCustomEditor(float.class, new FloatEditor());  25     }26     27     28 }

上面的代码不仅仅有日期格式的编辑器，还有基础类型的编辑器，这样就解决了SpringMVC中controller方法接受参数的时候，基础类型报错的问题了。

下面是测试用代码，继承BaseController之后就可以直接运行了。接受的参数有实体类和基础类型。

 1 import org.springframework.stereotype.Controller; 2 import org.springframework.web.bind.annotation.RequestMapping; 3  4 import com.kickstarter.entity.User; 5  6 @Controller("userController") 7 public class UserController extends BaseController{ 8  9     @RequestMapping(value="regUser")10     public String dateTest(User user ,double dd){11         12         System.out.println( user.toString() );13         System.out.println( dd );14         return "index"; 15     }16 }

以上，问题解决。然后我们切换第二种方式，删除 BaseController这个类，直接在User实体类中的createDate字段上加上注解，注意第10行代码：

 1 import java.util.Date; 2  3 import org.springframework.format.annotation.DateTimeFormat; 4  5 public class User { 6  7     private int userId; 8     private String userName; 9     10     @DateTimeFormat(pattern="yyyy-MM-dd")11     private Date createDate;12     13     public User() {}14 15     public User(int userId, String userName, Date createDate) {16         super();17         this.userId = userId;18         this.userName = userName;19         this.createDate = createDate;20     }21 22     public User(String userName, Date createDate) {23         super();24         this.userName = userName;25         this.createDate = createDate;26     }27 28     public int getUserId() {29         return userId;30     }31 32     public void setUserId(int userId) {33         this.userId = userId;34     }35 36     public String getUserName() {37         return userName;38     }39 40     public void setUserName(String userName) {41         this.userName = userName;42     }43 44     public Date getCreateDate() {45         return createDate;46     }47 48     public void setCreateDate(Date createDate) {49         this.createDate = createDate;50     }51 52     @Override53     public String toString() {54         return "User [createDate=" + createDate + ", userId=" + userId55                 + ", userName=" + userName + "]";56     }57 }

这样也可以解决日期格式报400问题。而且不管页面是否有数据都可以正常使用。