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。