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

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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

 import java.util.Date;

 public class User {

     private int userId;
     private String userName;
     private Date createDate;

     public User() {}

     public User(int userId, String userName, Date createDate) {
         super();
         this.userId = userId;
         this.userName = userName;
         this.createDate = createDate;
     }

     public User(String userName, Date createDate) {
         super();
         this.userName = userName;
         this.createDate = createDate;
     }

     public int getUserId() {
         return userId;
     }

     public void setUserId(int userId) {
         this.userId = userId;
     }

     public String getUserName() {
         return userName;
     }

     public void setUserName(String userName) {
         this.userName = userName;
     }

     public Date getCreateDate() {
         return createDate;
     }

     public void setCreateDate(Date createDate) {
         this.createDate = createDate;
     }

     @Override
     public String toString() {
         return "User [createDate=" + createDate + ", userId=" + userId
                 + ", userName=" + userName + "]";
     }
 }

页面代码

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

 import java.text.SimpleDateFormat;
 import java.util.Date;

 import org.springframework.beans.propertyeditors.CustomDateEditor;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.WebDataBinder;
 import org.springframework.web.bind.annotation.InitBinder;

 import sun.beans.editors.DoubleEditor;
 import sun.beans.editors.FloatEditor;
 import sun.beans.editors.IntEditor;
 import sun.beans.editors.LongEditor;

 @Controller
 public class BaseController {

     @InitBinder
     public void initBinder(WebDataBinder binder) {    

         binder.registerCustomEditor(Date.class, new CustomDateEditor(new SimpleDateFormat("yyyy-MM-dd"), true));
         binder.registerCustomEditor(int.class, new IntEditor());
         binder.registerCustomEditor(long.class, new LongEditor());
         binder.registerCustomEditor(double.class, new DoubleEditor());
         binder.registerCustomEditor(float.class, new FloatEditor());
     }

 }

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。

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

 import com.kickstarter.entity.User;

 @Controller("userController")
 public class UserController extends BaseController{

     @RequestMapping(value="regUser")
     public String dateTest(User user , double dd){

         System.out.println( user.toString() );
         System.out.println( dd );
         return "index";
     }
 }

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：

 import java.util.Date;

 import org.springframework.format.annotation.DateTimeFormat;

 public class User {

     private int userId;
     private String userName;

     @DateTimeFormat(pattern="yyyy-MM-dd")
     private Date createDate;

     public User() {}

     public User(int userId, String userName, Date createDate) {
         super();
         this.userId = userId;
         this.userName = userName;
         this.createDate = createDate;
     }

     public User(String userName, Date createDate) {
         super();
         this.userName = userName;
         this.createDate = createDate;
     }

     public int getUserId() {
         return userId;
     }

     public void setUserId(int userId) {
         this.userId = userId;
     }

     public String getUserName() {
         return userName;
     }

     public void setUserName(String userName) {
         this.userName = userName;
     }

     public Date getCreateDate() {
         return createDate;
     }

     public void setCreateDate(Date createDate) {
         this.createDate = createDate;
     }

     @Override
     public String toString() {
         return "User [createDate=" + createDate + ", userId=" + userId
                 + ", userName=" + userName + "]";
     }
 }

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。