1、日期转换默认格式覆盖注解格式的bug；

com.alibaba.fastjson.serializer.JSONSerializer#writeWithFormat

修改后的代码：

public final void writeWithFormat(Object object, String format) {    if (object instanceof Date) {        DateFormat dateFormat = this.getDateFormat();        if(format!=null){            dateFormat = new SimpleDateFormat(format, locale);            dateFormat.setTimeZone(timeZone);        }        String text = dateFormat.format((Date) object);        out.writeString(text);        return;    }    write(object);}

2、解决转JSON时候Bean字段默认被排序的毛病：

com.alibaba.fastjson.serializer.SerializeWriter#computeFeatures

修改的代码：

    protected void computeFeatures() {        quoteFieldNames = (this.features & SerializerFeature.QuoteFieldNames.mask) != 0;        useSingleQuotes = (this.features & SerializerFeature.UseSingleQuotes.mask) != 0;//        sortField = (this.features & SerializerFeature.SortField.mask) != 0;        sortField = false;        disableCircularReferenceDetect = (this.features & SerializerFeature.DisableCircularReferenceDetect.mask) != 0;        beanToArray = (this.features & SerializerFeature.BeanToArray.mask) != 0;        writeNonStringValueAsString = (this.features & SerializerFeature.WriteNonStringValueAsString.mask) != 0;        notWriteDefaultValue = (this.features & SerializerFeature.NotWriteDefaultValue.mask) != 0;        writeEnumUsingName = (this.features & SerializerFeature.WriteEnumUsingName.mask) != 0;        writeEnumUsingToString = (this.features & SerializerFeature.WriteEnumUsingToString.mask) != 0;        writeDirect = quoteFieldNames //                      && (this.features & nonDirectFeautres) == 0 //                      && (beanToArray || writeEnumUsingName)                      ;        keySeperator = useSingleQuotes ? '\'' : '"';    }