另见:json 转日期出错,JSONArray.toCollection 时间总是转化为当前时间
net.sf.json 这个包还真是存在不少问题。
上代码:
package net.sf.ezmorph.object;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import net.sf.ezmorph.MorphException;
import org.apache.commons.lang.builder.EqualsBuilder;
import org.apache.commons.lang.builder.HashCodeBuilder;
/**
* Morphs a String to a Date.<br>
* <p>
* This morpher will iterate through the supplied formats until one succeeds or
* the default value is returned (if default value is configured).
* </p>
*
* @author Andres Almiray <aalmiray@users.sourceforge.net>
*/
public final class DateMorpherEx extends AbstractObjectMorpher {
private Date defaultValue;
private String[] formats;
private boolean lenient;
private Locale locale;
/**
* @param formats
* a list of formats this morpher supports.
*/
public DateMorpherEx(String[] formats) {
this(formats, Locale.getDefault(), false);
}
/**
* @param formats
* a list of formats this morpher supports.
* @param lenient
* if the parsing should be lenient or not.
*/
public DateMorpherEx(String[] formats, boolean lenient) {
this(formats, Locale.getDefault(), lenient);
}
/**
* @param formats
* a list of formats this morpher supports.
* @param defaultValue
* return value if the value to be morphed is null.
*/
public DateMorpherEx(String[] formats, Date defaultValue) {
this(formats, defaultValue, Locale.getDefault(), false);
}
/**
* @param formats
* a list of formats this morpher supports.
* @param defaultValue
* return value if the value to be morphed is null.
* @param locale
* the Locale used to parse each format.
* @param lenient
* if the parsing should be lenient or not.
*/
public DateMorpherEx(String[] formats, Date defaultValue, Locale locale, boolean lenient) {
super(true);
if (formats == null || formats.length == 0) {
throw new MorphException("invalid array of formats");
}
// should use defensive copying ?
this.formats = formats;
if (locale == null) {
this.locale = Locale.getDefault();
} else {
this.locale = locale;
}
this.lenient = lenient;
setDefaultValue(defaultValue);
}
/**
* @param formats
* a list of formats this morpher supports.
* @param locale
* the Locale used to parse each format.
*/
public DateMorpherEx(String[] formats, Locale locale) {
this(formats, locale, false);
}
/**
* @param formats
* a list of formats this morpher supports.
* @param locale
* the Locale used to parse each format.
* @param lenient
* if the parsing should be lenient or not.
*/
public DateMorpherEx(String[] formats, Locale locale, boolean lenient) {
if (formats == null || formats.length == 0) {
throw new MorphException("invalid array of formats");
}
// should use defensive copying ?
this.formats = formats;
if (locale == null) {
this.locale = Locale.getDefault();
} else {
this.locale = locale;
}
this.lenient = lenient;
}
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null) {
return false;
}
if (!(obj instanceof DateMorpherEx)) {
return false;
}
DateMorpherEx other = (DateMorpherEx) obj;
EqualsBuilder builder = new EqualsBuilder();
builder.append(formats, other.formats);
builder.append(locale, other.locale);
builder.append(lenient, other.lenient);
if (isUseDefault() && other.isUseDefault()) {
builder.append(getDefaultValue(), other.getDefaultValue());
return builder.isEquals();
} else if (!isUseDefault() && !other.isUseDefault()) {
return builder.isEquals();
} else {
return false;
}
}
/**
* Returns the default value for this Morpher.
*/
public Date getDefaultValue() {
if (null != defaultValue){
return (Date) defaultValue.clone();
}
return null;
}
public int hashCode() {
HashCodeBuilder builder = new HashCodeBuilder();
builder.append(formats);
builder.append(locale);
builder.append(lenient);
if (isUseDefault()) {
builder.append(getDefaultValue());
}
return builder.toHashCode();
}
public Object morph(Object value) {
if (value == null) {
return null;
}
if (Date.class.isAssignableFrom(value.getClass())) {
return (Date) value;
}
if (!supports(value.getClass())) {
throw new MorphException(value.getClass() + " is not supported");
}
String strValue = (String) value;
strValue = strValue.trim();
if (0 == strValue.length()){
if (isUseDefault()) {
return defaultValue;
} else {
throw new MorphException("Unable to parse the date " + value);
}
}
SimpleDateFormat dateParser = null;
for (int i = 0; i < formats.length; i++) {
if (dateParser == null) {
dateParser = new SimpleDateFormat(formats[i], locale);
} else {
dateParser.applyPattern(formats[i]);
}
dateParser.setLenient(lenient);
try {
return dateParser.parse(strValue.toLowerCase());
} catch (ParseException pe) {
// ignore exception, try the next format
}
}
// unable to parse the date
if (isUseDefault()) {
return defaultValue;
} else {
throw new MorphException("Unable to parse the date " + value);
}
}
public Class morphsTo() {
return Date.class;
}
/**
* Sets the defaultValue to use if the value to be morphed is null.
*
* @param defaultValue
* return value if the value to be morphed is null
*/
public void setDefaultValue(Date defaultValue) {
if (null != defaultValue) {
this.defaultValue = (Date) defaultValue.clone();
}
this.defaultValue = null;
}
public boolean supports(Class clazz) {
return String.class.isAssignableFrom(clazz);
}
}
这里面主要是对 setDefaultValue 和 getDefaultValue 进行修改,使其支持 null 值。
还有就是 morph 方法,感觉还有很大的优化空间。