修改ObjectMapper的StdDateFormat（字符串
2017-12-06 本文已影响1043人
rejoice001
使用RestTemplate来进行http接口请求接收响应时，org.springframework.http.converter.json.MappingJackson2HttpMessageConverter中反系列化时实际上是使用ObjectMapper来进行反系列化，最终对日期的操作com.fasterxml.jackson.databind.util.StdDateFormat.parse(String dateStr)，里面内置了4种格式："yyyy-MM-dd'T'HH:mm:ss.SSSZ"、"yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"、"yyyy-MM-dd"、"EEE, dd MMM yyyy HH:mm:ss zzz"，不能很好支持中国人的习惯，另外此类是线程不安全的，每次都会创建一个新的对象来操作日期，尽管ObjectMapper有全局设置dateForma：mapper.setDateFormat(dateFormat)，但是最终获取DateFormat时只会Clone其属性，而常量和方法还是类的：com.fasterxml.jackson.databind.DeserializationContext.getDateFormat()
protected DateFormat getDateFormat()
{
if (_dateFormat != null) {
return _dateFormat;
}
/* 24-Feb-2012, tatu: At this point, all timezone configuration
* should have occured, with respect to default dateformat
* and timezone configuration. But we still better clone
* an instance as formatters may be stateful.
*/
DateFormat df = _config.getDateFormat();
_dateFormat = df = (DateFormat) df.clone();
return df;
}
所以只能重写com.fasterxml.jackson.databind.util.StdDateFormat的parse和format方法（需要可自行重写），由于简书无法设置字体颜色，无法高亮修改部分，
其中修改部分为
静态常亮中DATE_FORMAT_TO_ALL开始处设置了几个新增的格式
/**
* yyyy-MM-dd HH:mm:ss.SSS
*/
protected final static String DATE_FORMAT_TO_ALL= "yyyy-MM-dd HH:mm:ss.SSS";
/**
* yyyy-MM-dd HH:mm:ss
*/
protected final static String DATE_FORMAT_TO_SECOND= "yyyy-MM-dd HH:mm:ss";
/**
* yyyy-MM-dd HH:mm
*/
protected final static String DATE_FORMAT_TO_MINUTE= "yyyy-MM-dd HH:mm";
并加入到集合中
protected final static String[] ALL_FORMATS = new String[] {
DATE_FORMAT_STR_ISO8601,
DATE_FORMAT_STR_ISO8601_Z,
DATE_FORMAT_STR_RFC1123,
DATE_FORMAT_STR_PLAIN,
DATE_FORMAT_TO_ALL,
DATE_FORMAT_TO_SECOND,
DATE_FORMAT_TO_MINUTE,
};
具体parse方法中，如果默认的方法转换结果为null，则采用新加的格式
@Override
public Date parse(String dateStr) throws ParseException
{
dateStr = dateStr.trim();
ParsePosition pos = new ParsePosition(0);
Date result = parse(dateStr, pos);
if (result != null) {
return result;
}else{
//修改处，使用新的格式转换
//modified by rejoice.zhang at 2017-02-27
result = DateUtils.parseDate(dateStr, DATE_FORMAT_TO_ALL,DATE_FORMAT_TO_SECOND,DATE_FORMAT_TO_MINUTE);
下面是完整类的代码（注意：每个人的版本不同，不要拷贝我的完整代码，建议自行拷贝自身版本的代码进行修改，如果有需要）
package com.fasterxml.jackson.databind.util;
import java.text.DateFormat;
import java.text.FieldPosition;
import java.text.ParseException;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.*;
import org.apache.commons.lang3.time.DateUtils;
import com.fasterxml.jackson.core.io.NumberInput;
/**
* Default {@link DateFormat} implementation used by standard Date
* serializers and deserializers. For serialization defaults to using
* an ISO-8601 compliant format (format String "yyyy-MM-dd'T'HH:mm:ss.SSSZ")
* and for deserialization, both ISO-8601 and RFC-1123.
*/
@SuppressWarnings("serial")
public class StdDateFormat
extends DateFormat
{
/* TODO !!! 24-Nov-2009, tatu: Need to rewrite this class:
* JDK date parsing is awfully brittle, and ISO-8601 is quite
* permissive. The two don't mix, need to write a better one.
*/
// Note: [JACKSON-697] is the issue for rewrite
/**
* Defines a commonly used date format that conforms
* to ISO-8601 date formatting standard, when it includes basic undecorated
* timezone definition
*/
<font color=red>
protected final static String DATE_FORMAT_STR_ISO8601 = "yyyy-MM-dd'T'HH:mm:ss.SSSZ";
</font>
/**
* Same as 'regular' 8601, but handles 'Z' as an alias for "+0000"
* (or "GMT")
*/
protected final static String DATE_FORMAT_STR_ISO8601_Z = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'";
/**
* ISO-8601 with just the Date part, no time
*/
protected final static String DATE_FORMAT_STR_PLAIN = "yyyy-MM-dd";
/**
* This constant defines the date format specified by
* RFC 1123 / RFC 822.
*/
protected final static String DATE_FORMAT_STR_RFC1123 = "EEE, dd MMM yyyy HH:mm:ss zzz";
/**
* yyyy-MM-dd HH:mm:ss.SSS
*/
protected final static String DATE_FORMAT_TO_ALL= "yyyy-MM-dd HH:mm:ss.SSS";
/**
* yyyy-MM-dd HH:mm:ss
*/
protected final static String DATE_FORMAT_TO_SECOND= "yyyy-MM-dd HH:mm:ss";
/**
* yyyy-MM-dd HH:mm
*/
protected final static String DATE_FORMAT_TO_MINUTE= "yyyy-MM-dd HH:mm";
/**
* For error messages we'll also need a list of all formats.
*/
protected final static String[] ALL_FORMATS = new String[] {
DATE_FORMAT_STR_ISO8601,
DATE_FORMAT_STR_ISO8601_Z,
DATE_FORMAT_STR_RFC1123,
DATE_FORMAT_STR_PLAIN,
DATE_FORMAT_TO_ALL,
DATE_FORMAT_TO_SECOND,
DATE_FORMAT_TO_MINUTE,
};
/**
* By default we use GMT for everything.
*/
private final static TimeZone DEFAULT_TIMEZONE;
static {
DEFAULT_TIMEZONE = TimeZone.getTimeZone("GMT");
}
protected final static DateFormat DATE_FORMAT_RFC1123;
protected final static DateFormat DATE_FORMAT_ISO8601;
protected final static DateFormat DATE_FORMAT_ISO8601_Z;
protected final static DateFormat DATE_FORMAT_PLAIN;
/* Let's construct "blueprint" date format instances: can not be used
* as is, due to thread-safety issues, but can be used for constructing
* actual instances more cheaply (avoids re-parsing).
*/
static {
/* Another important thing: let's force use of GMT for
* baseline DataFormat objects
*/
DATE_FORMAT_RFC1123 = new SimpleDateFormat(DATE_FORMAT_STR_RFC1123, Locale.US);
DATE_FORMAT_RFC1123.setTimeZone(DEFAULT_TIMEZONE);
DATE_FORMAT_ISO8601 = new SimpleDateFormat(DATE_FORMAT_STR_ISO8601);
DATE_FORMAT_ISO8601.setTimeZone(DEFAULT_TIMEZONE);
DATE_FORMAT_ISO8601_Z = new SimpleDateFormat(DATE_FORMAT_STR_ISO8601_Z);
DATE_FORMAT_ISO8601_Z.setTimeZone(DEFAULT_TIMEZONE);
DATE_FORMAT_PLAIN = new SimpleDateFormat(DATE_FORMAT_STR_PLAIN);
DATE_FORMAT_PLAIN.setTimeZone(DEFAULT_TIMEZONE);
}
/**
* A singleton instance can be used for cloning purposes.
*/
public final static StdDateFormat instance = new StdDateFormat();
/**
* Caller may want to explicitly override timezone to use; if so,
* we will have non-null value here.
*/
protected transient TimeZone _timezone;
protected transient DateFormat _formatRFC1123;
protected transient DateFormat _formatISO8601;
protected transient DateFormat _formatISO8601_z;
protected transient DateFormat _formatPlain;
/*
/**********************************************************
/* Life cycle, accessing singleton "standard" formats
/**********************************************************
*/
public StdDateFormat() { }
public StdDateFormat(TimeZone tz) {
_timezone = tz;
}
public static TimeZone getDefaultTimeZone() {
return DEFAULT_TIMEZONE;
}
/**
* Method used for creating a new instance with specified timezone;
* if no timezone specified, defaults to the default timezone (UTC).
*/
public StdDateFormat withTimeZone(TimeZone tz) {
if (tz == null) {
tz = DEFAULT_TIMEZONE;
}
return new StdDateFormat(tz);
}
@Override
public StdDateFormat clone() {
/* Although there is that much state to share, we do need to
* orchestrate a bit, mostly since timezones may be changed
*/
return new StdDateFormat();
}
/**
* Method for getting the globally shared DateFormat instance
* that uses GMT timezone and can handle simple ISO-8601
* compliant date format.
*/
public static DateFormat getBlueprintISO8601Format() {
return DATE_FORMAT_ISO8601;
}
/**
* Method for getting a non-shared DateFormat instance
* that uses specified timezone and can handle simple ISO-8601
* compliant date format.
*/
public static DateFormat getISO8601Format(TimeZone tz) {
return _cloneFormat(DATE_FORMAT_ISO8601, tz);
}
/**
* Method for getting the globally shared DateFormat instance
* that uses GMT timezone and can handle RFC-1123
* compliant date format.
*/
public static DateFormat getBlueprintRFC1123Format() {
return DATE_FORMAT_RFC1123;
}
/**
* Method for getting a non-shared DateFormat instance
* that uses specific timezone and can handle RFC-1123
* compliant date format.
*/
public static DateFormat getRFC1123Format(TimeZone tz) {
return _cloneFormat(DATE_FORMAT_RFC1123, tz);
}
/*
/**********************************************************
/* Public API
/**********************************************************
*/
@Override
public void setTimeZone(TimeZone tz)
{
/* DateFormats are timezone-specific (via Calendar contained),
* so need to reset instances if timezone changes:
*/
if (tz != _timezone) {
_formatRFC1123 = null;
_formatISO8601 = null;
_formatISO8601_z = null;
_formatPlain = null;
_timezone = tz;
}
}
@Override
public Date parse(String dateStr) throws ParseException
{
dateStr = dateStr.trim();
ParsePosition pos = new ParsePosition(0);
Date result = parse(dateStr, pos);
if (result != null) {
return result;
}else{
//modified by rejoice.zhang at 2017-02-27
result = DateUtils.parseDate(dateStr, DATE_FORMAT_TO_ALL,DATE_FORMAT_TO_SECOND,DATE_FORMAT_TO_MINUTE);
if(result != null){
return result;
}
}
StringBuilder sb = new StringBuilder();
for (String f : ALL_FORMATS) {
if (sb.length() > 0) {
sb.append("\", \"");
} else {
sb.append('"');
}
sb.append(f);
}
sb.append('"');
throw new ParseException
(String.format("Can not parse date \"%s\": not compatible with any of standard forms (%s)",
dateStr, sb.toString()), pos.getErrorIndex());
}
@Override
public Date parse(String dateStr, ParsePosition pos)
{
if (looksLikeISO8601(dateStr)) { // also includes "plain"
return parseAsISO8601(dateStr, pos);
}
/* 14-Feb-2010, tatu: As per [JACKSON-236], better also
* consider "stringified" simple time stamp
*/
int i = dateStr.length();
while (--i >= 0) {
char ch = dateStr.charAt(i);
if (ch < '0' || ch > '9') break;
}
if (i < 0) { // all digits
if (NumberInput.inLongRange(dateStr, false)) {
return new Date(Long.parseLong(dateStr));
}
}
// Otherwise, fall back to using RFC 1123
return parseAsRFC1123(dateStr, pos);
}
@Override
public StringBuffer format(Date date, StringBuffer toAppendTo,
FieldPosition fieldPosition)
{
if (_formatISO8601 == null) {
_formatISO8601 = _cloneFormat(DATE_FORMAT_ISO8601);
}
return _formatISO8601.format(date, toAppendTo, fieldPosition);
}
/*
/**********************************************************
/* Helper methods
/**********************************************************
*/
/**
* Overridable helper method used to figure out which of supported
* formats is the likeliest match.
*/
protected boolean looksLikeISO8601(String dateStr)
{
if (dateStr.length() >= 5
&& Character.isDigit(dateStr.charAt(0))
&& Character.isDigit(dateStr.charAt(3))
&& dateStr.charAt(4) == '-'
) {
return true;
}
return false;
}
protected Date parseAsISO8601(String dateStr, ParsePosition pos)
{
/* 21-May-2009, tatu: DateFormat has very strict handling of
* timezone modifiers for ISO-8601. So we need to do some scrubbing.
*/
/* First: do we have "zulu" format ('Z' == "GMT")? If yes, that's
* quite simple because we already set date format timezone to be
* GMT, and hence can just strip out 'Z' altogether
*/
int len = dateStr.length();
char c = dateStr.charAt(len-1);
DateFormat df;
// [JACKSON-200]: need to support "plain" date...
if (len <= 10 && Character.isDigit(c)) {
df = _formatPlain;
if (df == null) {
df = _formatPlain = _cloneFormat(DATE_FORMAT_PLAIN);
}
} else if (c == 'Z') {
df = _formatISO8601_z;
if (df == null) {
df = _formatISO8601_z = _cloneFormat(DATE_FORMAT_ISO8601_Z);
}
// [JACKSON-334]: may be missing milliseconds... if so, add
if (dateStr.charAt(len-4) == ':') {
StringBuilder sb = new StringBuilder(dateStr);
sb.insert(len-1, ".000");
dateStr = sb.toString();
}
} else {
// Let's see if we have timezone indicator or not...
if (hasTimeZone(dateStr)) {
c = dateStr.charAt(len-3);
if (c == ':') { // remove optional colon
// remove colon
StringBuilder sb = new StringBuilder(dateStr);
sb.delete(len-3, len-2);
dateStr = sb.toString();
} else if (c == '+' || c == '-') { // missing minutes
// let's just append '00'
dateStr += "00";
}
// [JACKSON-334]: may be missing milliseconds... if so, add
len = dateStr.length();
// '+0000' (5 chars); should come after '.000' (4 chars) of milliseconds, so:
c = dateStr.charAt(len-9);
if (Character.isDigit(c)) {
StringBuilder sb = new StringBuilder(dateStr);
sb.insert(len-5, ".000");
dateStr = sb.toString();
}
df = _formatISO8601;
if (_formatISO8601 == null) {
df = _formatISO8601 = _cloneFormat(DATE_FORMAT_ISO8601);
}
} else {
/* 24-Nov-2009, tatu: Ugh. This is getting pretty
* ugly. Need to rewrite soon!
*/
// If not, plain date. Easiest to just patch 'Z' in the end?
StringBuilder sb = new StringBuilder(dateStr);
// And possible also millisecond part if missing
int timeLen = len - dateStr.lastIndexOf('T') - 1;
if (timeLen <= 8) {
sb.append(".000");
}
sb.append('Z');
dateStr = sb.toString();
df = _formatISO8601_z;
if (df == null) {
df = _formatISO8601_z = _cloneFormat(DATE_FORMAT_ISO8601_Z);
}
}
}
return df.parse(dateStr, pos);
}
protected Date parseAsRFC1123(String dateStr, ParsePosition pos)
{
if (_formatRFC1123 == null) {
_formatRFC1123 = _cloneFormat(DATE_FORMAT_RFC1123);
}
return _formatRFC1123.parse(dateStr, pos);
}
private final static boolean hasTimeZone(String str)
{
// Only accept "+hh", "+hhmm" and "+hh:mm" (and with minus), so
int len = str.length();
if (len >= 6) {
char c = str.charAt(len-6);
if (c == '+' || c == '-') return true;
c = str.charAt(len-5);
if (c == '+' || c == '-') return true;
c = str.charAt(len-3);
if (c == '+' || c == '-') return true;
}
return false;
}
private final DateFormat _cloneFormat(DateFormat df) {
return _cloneFormat(df, _timezone);
}
private final static DateFormat _cloneFormat(DateFormat df, TimeZone tz)
{
df = (DateFormat) df.clone();
if (tz != null) {
df.setTimeZone(tz);
}
return df;
}
}
当然上面是全局设置，也可以在特定的类的属性上面加上@JsonFormat (局部)
