SpringMVC配置字符串绑定日期对象

1. controller中局部绑定

步骤一：编写转换器，前端字符串转化为日期对象

public class DateEditor extends PropertyEditorSupport { private final DateFormat dateFormat; private final boolean allowEmpty; private final int exactDateLength; /**  * Create a new DateEditor instance, using the given DateFormat  * for parsing and rendering.  */ public DateEditor(DateFormat dateFormat, boolean allowEmpty) {  this.dateFormat = dateFormat;  this.allowEmpty = allowEmpty;  this.exactDateLength = -1; } /**  * Create a new DateEditor instance, using the given DateFormat  * for parsing and rendering.  */ public DateEditor(DateFormat dateFormat, boolean allowEmpty, int exactDateLength) {  this.dateFormat = dateFormat;  this.allowEmpty = allowEmpty;  this.exactDateLength = exactDateLength; } /**  * Parse the Date from the given text, using the specified DateFormat.  */ @Override public void setAsText(String text) throws IllegalArgumentException {  if (this.allowEmpty && !StringUtils.hasText(text)) {   // Treat empty String as null value.   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");  }  else {   try {    long dateLong = Long.parseLong(text);    text = this.dateFormat.format(new Date(dateLong));   } catch (Exception ex) {    // 输入文本非long型   }   try {    setValue(this.dateFormat.parse(text));   } catch (ParseException ex) {    setValue(null);   }  } } /**  * Format the Date as String, using the specified DateFormat.  */ @Override public String getAsText() {  Date value = (Date) getValue();  return (value != null ? this.dateFormat.format(value) : ""); }}

步骤二：在要转化的controller中注册

/** * 绑定日期格式 * * @param res 资源请求 * @param binder 资源绑定 */@InitBinderpublic void initBinder(HttpServletRequest res, WebDataBinder binder) { SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); binder.registerCustomEditor(Date.class, new DateEditor(sdf, false));}

2. 配置全局日期转换器

新版的Spring3.1.x之后，配置全局转换器有所不同。

步骤一：编写全局日期转换器

import java.text.ParseException;import java.text.SimpleDateFormat;import java.util.Date;import java.util.regex.Matcher;import java.util.regex.Pattern;import java.util.regex.PatternSyntaxException;import org.springframework.core.convert.converter.Converter;import org.springframework.util.StringUtils;public class DateConverter implements Converter<String, Date> { private static final SimpleDateFormat DATEFORMAT = new SimpleDateFormat("yyyy-MM-dd");      private static final SimpleDateFormat TIMEFORMAT = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");    private static final SimpleDateFormat TIMEFORMAT2 = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss"); @Override public Date convert(String source) {//   SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");  if (!StringUtils.hasText(source)) {   return null;  }  try {   SimpleDateFormat dateFormat = getDateFormat(source);   dateFormat.setLenient(false);   return dateFormat.parse(source);  } catch (ParseException e) {   e.printStackTrace();  }catch (Exception e) {   e.printStackTrace();  }  return null; } /**  * 功能：用本地的三种日期格式实例化出DateFormat对象  *  * @param value 待解析的值  * @return DateFormat对象  */ private SimpleDateFormat getDateFormat(String value){  SimpleDateFormat dateFormat = null;  Pattern patter = null;  Matcher matcher = null;  String formatter = null;  try{   // ^\d{4}(\-|\/|\.)\d{1,2}\1\d{1,2}$   // yyyy-mm-dd   patter = Pattern.compile("^\\d{4}\\-\\d{1,2}\\-\\d{1,2}$");   matcher = patter.matcher(value);   if (matcher.matches()) {    dateFormat = DATEFORMAT;    formatter = "yyyy-mm-dd";    //System.out.println("yyyy-mm-dd");    return dateFormat;   }   // yyyy-MM-dd HH:mm:ss   patter = Pattern.compile("^\\d{4}\\-\\d{1,2}\\-\\d{1,2}\\s{1}\\d{1,2}:\\d{1,2}:\\d{1,2}$");   matcher = patter.matcher(value);   if (matcher.matches()) {    dateFormat = TIMEFORMAT;    formatter = "yyyy-MM-dd HH:mm:ss";    //System.out.println("yyyy-MM-dd HH:mm:ss");    return dateFormat;   }   // yyyy/MM/dd HH:mm:ss   patter = Pattern.compile("^\\d{4}\\/\\d{1,2}\\/\\d{1,2}\\s{1}\\d{1,2}:\\d{1,2}:\\d{1,2}$"); // yyyy-MM-dd HH:mm:ss   matcher = patter.matcher(value);   if (matcher.matches()) {    dateFormat = TIMEFORMAT2;    formatter = "yyyy/MM/dd HH:mm:ss";    //System.out.println("yyyy/MM/dd HH:mm:ss");    return dateFormat;   }   if (!StringUtils.hasText(formatter)) {    throw new IllegalArgumentException("cannot parse value[" + value + "] to date");   }  }catch(PatternSyntaxException se){   throw se;  }  return dateFormat; }

步骤二：在配置文件中进行配置

(1) <mvc:annotation-driven />中配置中的AnnotationMethodHandlerAdapter已经配置了webBindingInitializer，

我们可以通过设置其属性conversionService来实现自定义类型转换

<bean id="conversionService" class="org.springframework.format.support.FormattingConversionServiceFactoryBean">     <property name="converters">      <list>       <bean class="com.doje.XXX.web.DateConverter" />     <!-- 转换器实现类 -->  </list>     </property>    </bean>  

(2) 修改spring service context xml配置文件中的annotation-driven,增加属性conversion-service指向新增的conversionService bean

<mvc:annotation-driven conversion-service="conversionService" />