SpringMVC + Spring + MyBatis 學習筆記：提交數據遭遇基礎類型和日期類型報400錯誤解決方法

系統：WIN8.1

數據庫：Oracle 11GR2

開發工具：MyEclipse 8.6

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

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使用SpringMVC開發的時候，頁面如果有日期格式的數據，后台接受也是java.util.Date，則報告400錯誤 。下面是解決方案的演示示例：

 

這個是實體類，里面createDate就是java.util.Date類型

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 + "]";
    }
}

頁面代碼

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

 因為對於原生基本類型的form表單綁定，會出錯。需要指定具體的類型編輯器。用法如下：首先在BaseController中增加方法initBinder，並使用注解@InitBinder標注，那么spring mvc在綁定表單之前，都會先注冊這些編輯器。剩下的控制器都繼承該類。CustomDateEditor spring自己已經提供了。代碼如下：

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());  
    }
    
    
}

上面的代碼不僅僅有日期格式的編輯器，還有基礎類型的編輯器，這樣就解決了SpringMVC中controller方法接受參數的時候，基礎類型報錯的問題了。

下面是測試用代碼，繼承BaseController之后就可以直接運行了。接受的參數有實體類和基礎類型。

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，問題解決。然后我們切換第二種方式，刪除 BaseController 這個類，直接在User實體類中的 createDate字段上加上注解 ， 注意第10行代碼：

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 + "]";
    }
}

這樣也可以解決日期格式報400問題。而且不管頁面是否有數據都可以正常使用。