第一,, 前台表单中,有一个日期 2014-03-11 提交到后台类型为date 时,会报一个转换类错误 如下错误
default message [Failed to convert
property value of type 'java.lang.String' to required type
'java.util.Date' for property 'sdate';
因为springMVC不会自动转换.
解决办法
- 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;
-
- 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 上加一个段, 重点在于红色字体
- <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" />
- </property></span>
- </bean>
第二: 后台回返前台时, 日期格式是Unix时间戳
例如 后台data : 2014-03-11 20:22:25 返回前台json的时间戳是1394508055 很明显这不是我的要的结果, 我们需要的是 2014-03-11 20:22:25
解决办法,在controller下新建这个类,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;
-
- @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);
- }
- }
结语: 前台 - 后台 或 后台 - 前台 互相转换 方法有多种,. 这些只是之一,供参考!
转自http://blog.csdn.net/mmm333zzz/article/details/21696653
SpringMVC自定义日期类型的数据绑定
目录：
- 应用场景
- 实现方法
[一]、应用场景
在实际应用中，经常会碰到表单中的日期 字符串和Javabean中的日期类型的属性自动转换，一般页面输入的日志格式为：yyyy-MM-dd ,而SpringMVC中默认不支持这样的格式转换，所以需要我们自定义数据类型的绑定才能实现这个功能。
[二]、实现方法
利用 WebBindingInitializer 注册自定义日期转换控制器。
自定义日期转换器：MyDataBinding.java
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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;
/**
* 自定义日期、时间的类型绑定
*
* @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 的实现：CustomTimestampEditor.java
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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) : "");
}
}
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修改spring-mvc 的配置文件，添加 webBindingInitializer 属性的注入配置：
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<!--Spring3.1 之后的自定义注解 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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这样就可以实现表单中的字符串自动转换为Date或者Timestamp 类型。
本文介绍到此结束@Michael Sun.
转自http://www.micmiu.com/j2ee/spring/springmvc-binding-date/
