自定義日期類型的數據綁定 前台 - 后台 或 后台 - 前台 互相轉換

第一,, 前台表單中,有一個日期 2014-03-11 提交到后台類型為date 時,會報一個轉換類錯誤 如下錯誤

default message [Failed to convert property value of type 'java.lang.String' to required type 'java.util.Date' for property 'sdate';

因為springMVC不會自動轉換.

解決辦法 

package com.lanyuan.util;

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

import org.springframework.beans.propertyeditors.CustomDateEditor;
import org.springframework.web.bind.WebDataBinder;
import org.springframework.web.bind.support.WebBindingInitializer;
import org.springframework.web.context.request.WebRequest;

/**
 * spring3 mvc 的日期傳遞[前台-后台]bug:
 * org.springframework.validation.BindException
 * 的解決方式.包括xml的配置
 *  new SimpleDateFormat("yyyy-MM-dd");  這里的日期格式必須與提交的日期格式一致
 * @author lanyuan
 * Email：[e-mail]
 * date：2014-3-20
 */
public class SpringMVCDateConverter implements WebBindingInitializer {

  public void initBinder(WebDataBinder binder, WebRequest request) {
      SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
      binder.registerCustomEditor(Date.class, new CustomDateEditor(df,true));
  }

}

 

然后在springmvc的配置文件 spring-servlet.xml 上加一個段,  重點在於紅色字體

<bean
        class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
        <property name="messageConverters">
            <list>
                <ref bean="mappingJacksonHttpMessageConverter" />
            </list>
        </property>
        <span style="color:#ff0000;"><property name="webBindingInitializer">
            <bean class="com.lanyuan.util.SpringMVCDateConverter" />  <!-- 這里注冊自定義數據綁定類 -->
        </property></span>
    </bean>

第二: 后台回返前台時, 日期格式是Unix時間戳

例如 后台data : 2014-03-11 20:22:25  返回前台json的時間戳是1394508055  很明顯這不是我的要的結果, 我們需要的是 2014-03-11 20:22:25

解決辦法,在controller下新建這個類,然后在javabean的get方法上加上@JsonSerialize(using=JsonDateSerializer.class)

package com.lanyuan.controller;

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

import org.codehaus.jackson.JsonGenerator;
import org.codehaus.jackson.JsonProcessingException;
import org.codehaus.jackson.map.JsonSerializer;
import org.codehaus.jackson.map.SerializerProvider;
import org.springframework.stereotype.Component;

/**
 * springMVC返回json時間格式化
 * 解決SpringMVC使用@ResponseBody返回json時，日期格式默認顯示為時間戳的問題。
 * 需要在get方法上加上@JsonSerialize(using=JsonDateSerializer.class)
 * @author lanyuan
 * Email：[e-mail]
 * date：2014-2-17
 */
@Component
public class JsonDateSerializer extends JsonSerializer<Date>{
    private static final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
    public void serialize(Date date, JsonGenerator gen, SerializerProvider provider) throws IOException, JsonProcessingException {

        String formattedDate = dateFormat.format(date);

        gen.writeString(formattedDate);
    }
}

結語: 前台 - 后台  或 后台 - 前台 互相轉換 方法有多種,. 這些只是之一,供參考!

轉自http://blog.csdn.net/mmm333zzz/article/details/21696653

 

 

SpringMVC自定義日期類型的數據綁定

 

 

目錄：

 

1. 應用場景
2. 實現方法

 

[一]、應用場景

 

在實際應用中，經常會碰到表單中的日期 字符串和Javabean中的日期類型的屬性自動轉換，一般頁面輸入的日志格式為：yyyy-MM-dd ,而SpringMVC中默認不支持這樣的格式轉換，所以需要我們自定義數據類型的綁定才能實現這個功能。

 

[二]、實現方法

 

利用 WebBindingInitializer 注冊自定義日期轉換控制器。

 

自定義日期轉換器：MyDataBinding.java

 

 

package com.micmiu.demo.web.v1.utils; import java.text.SimpleDateFormat; import org.springframework.beans.propertyeditors.CustomDateEditor; import org.springframework.web.bind.WebDataBinder; import org.springframework.web.bind.support.WebBindingInitializer; import org.springframework.web.context.request.WebRequest; /** * 自定義日期、時間的類型綁定 * * @author <a href="http://www.micmiu.com">Michael Sun</a> */ public class MyDataBinding implements WebBindingInitializer { public void initBinder(WebDataBinder binder, WebRequest request) { SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd"); dateFormat.setLenient(false); SimpleDateFormat datetimeFormat = new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss"); datetimeFormat.setLenient(false); binder.registerCustomEditor(java.util.Date.class, new CustomDateEditor( dateFormat, true)); binder.registerCustomEditor(java.sql.Timestamp.class, new CustomTimestampEditor(datetimeFormat, true)); } }

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package com.micmiu.demo.web.v1.utils;   import java.text.SimpleDateFormat;   import org.springframework.beans.propertyeditors.CustomDateEditor; import org.springframework.web.bind.WebDataBinder; import org.springframework.web.bind.support.WebBindingInitializer; import org.springframework.web.context.request.WebRequest;   /** * 自定義日期、時間的類型綁定 * * @author <a href="http://www.micmiu.com">Michael Sun</a> */ public class MyDataBinding implements WebBindingInitializer {   public void initBinder(WebDataBinder binder, WebRequest request) { SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd"); dateFormat.setLenient(false);   SimpleDateFormat datetimeFormat = new SimpleDateFormat( "yyyy-MM-dd HH:mm:ss"); datetimeFormat.setLenient(false);   binder.registerCustomEditor(java.util.Date.class, new CustomDateEditor( dateFormat, true)); binder.registerCustomEditor(java.sql.Timestamp.class, new CustomTimestampEditor(datetimeFormat, true)); } }

 

Timestamp 的實現：CustomTimestampEditor.java 

 

 

package com.micmiu.demo.web.v1.utils; import java.beans.PropertyEditorSupport; import java.sql.Timestamp; import java.text.SimpleDateFormat; import org.springframework.util.StringUtils; import java.text.ParseException; /** * Property editor for <code>java.sql.Timestamp</code>,<br> * supporting a custom <code>java.text.DateFormat</code>. * * @author <a href="http://www.micmiu.com">Michael Sun</a> */ public class CustomTimestampEditor extends PropertyEditorSupport { private final SimpleDateFormat dateFormat; private final boolean allowEmpty; private final int exactDateLength; public CustomTimestampEditor(SimpleDateFormat dateFormat, boolean allowEmpty) { this.dateFormat = dateFormat; this.allowEmpty = allowEmpty; this.exactDateLength = -1; } public CustomTimestampEditor(SimpleDateFormat dateFormat, boolean allowEmpty, int exactDateLength) { this.dateFormat = dateFormat; this.allowEmpty = allowEmpty; this.exactDateLength = exactDateLength; } public void setAsText(String text) throws IllegalArgumentException { if ((this.allowEmpty) && (!(StringUtils.hasText(text)))) { setValue(null); } else { if ((text != null) && (this.exactDateLength >= 0) && (text.length() != this.exactDateLength)) { throw new IllegalArgumentException( "Could not parse date: it is not exactly" + this.exactDateLength + "characters long"); } try { setValue(new Timestamp(this.dateFormat.parse(text).getTime())); } catch (ParseException ex) { throw new IllegalArgumentException("Could not parse date: " + ex.getMessage(), ex); } } } public String getAsText() { Timestamp value = (Timestamp) getValue(); return ((value != null) ? this.dateFormat.format(value) : ""); } }

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package com.micmiu.demo.web.v1.utils;   import java.beans.PropertyEditorSupport; import java.sql.Timestamp; import java.text.SimpleDateFormat; import org.springframework.util.StringUtils; import java.text.ParseException;   /** * Property editor for <code>java.sql.Timestamp</code>,<br> * supporting a custom <code>java.text.DateFormat</code>. * * @author <a href="http://www.micmiu.com">Michael Sun</a> */ public class CustomTimestampEditor extends PropertyEditorSupport {   private final SimpleDateFormat dateFormat; private final boolean allowEmpty; private final int exactDateLength;   public CustomTimestampEditor(SimpleDateFormat dateFormat, boolean allowEmpty) { this.dateFormat = dateFormat; this.allowEmpty = allowEmpty; this.exactDateLength = -1; }   public CustomTimestampEditor(SimpleDateFormat dateFormat, boolean allowEmpty, int exactDateLength) { this.dateFormat = dateFormat; this.allowEmpty = allowEmpty; this.exactDateLength = exactDateLength; }   public void setAsText(String text) throws IllegalArgumentException { if ((this.allowEmpty) && (!(StringUtils.hasText(text)))) { setValue(null); } else { if ((text != null) && (this.exactDateLength >= 0) && (text.length() != this.exactDateLength)) { throw new IllegalArgumentException( "Could not parse date: it is not exactly" + this.exactDateLength + "characters long"); } try { setValue(new Timestamp(this.dateFormat.parse(text).getTime())); } catch (ParseException ex) { throw new IllegalArgumentException("Could not parse date: " + ex.getMessage(), ex); } } }   public String getAsText() { Timestamp value = (Timestamp) getValue(); return ((value != null) ? this.dateFormat.format(value) : ""); } }

 

修改spring-mvc 的配置文件，添加 webBindingInitializer 屬性的注入配置：

 

XHTML

<!--Spring3.1 之后的自定義注解 HandlerAdapter --> <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"> <property name="webBindingInitializer"> <bean class="com.micmiu.demo.web.v1.utils.MyDataBinding" /> </property> <property name="messageConverters"> <list> <bean class="org.springframework.http.converter.ByteArrayHttpMessageConverter" /> <bean class="org.springframework.http.converter.StringHttpMessageConverter"> <property name="writeAcceptCharset" value="false" /> <property name="supportedMediaTypes"> <list> <value>text/plain;charset=UTF-8</value> <value>*/*;charset=UTF-8</value> </list> </property> </bean> <bean class="org.springframework.http.converter.xml.SourceHttpMessageConverter" /> <bean class="org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter" /> <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"></bean> </list> </property> </bean>

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<!--Spring3.1 之后的自定義注解 HandlerAdapter --> <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"> <property name="webBindingInitializer"> <bean class="com.micmiu.demo.web.v1.utils.MyDataBinding" /> </property> <property name="messageConverters"> <list> <bean class="org.springframework.http.converter.ByteArrayHttpMessageConverter" /> <bean class="org.springframework.http.converter.StringHttpMessageConverter"> <property name="writeAcceptCharset" value="false" /> <property name="supportedMediaTypes"> <list> <value>text/plain;charset=UTF-8</value> <value>*/*;charset=UTF-8</value> </list> </property> </bean> <bean class="org.springframework.http.converter.xml.SourceHttpMessageConverter" /> <bean class="org.springframework.http.converter.support.AllEncompassingFormHttpMessageConverter" /> <bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"></bean> </list> </property> </bean>

 

這樣就可以實現表單中的字符串自動轉換為Date或者Timestamp 類型。

 

本文介紹到此結束@Michael Sun.

 

轉自http://www.micmiu.com/j2ee/spring/springmvc-binding-date/