一.简单表达格式:   thymeleaf的官方参考文档

  1.变量的表达式:${...}

  2.选择变量表达式:*{...}

  3.信息表达:#{...}

  4.链接URL表达式:@{...}

二.字面值

  1.文本文字:'one text''Another one!',…

  2.文字数量:0343.012.3,…

  3.布尔型常量:truefalse

  4.空的文字:null

  5.文字标记:onesometextmain,…

四:文本处理

  1.字符串并置:+

  2.文字替换:|The name is ${name}|

五.表达基本对象

  1.#ctx:上下文对象

  2.#vars:上下文变量

  3.#locale:上下文语言环境

  4.#httpServletRequest:(只有在Web上下文)HttpServletRequest对象

  5.#httpSession:(只有在Web上下文)HttpSession对象。

用法:

<span th:text="${#locale.country}">US</span>.

六.实用表达对象 

  • #dates: java.util的实用方法。对象:日期格式、组件提取等.
  • #calendars: 类似于#日期,但对于java.util。日历对象
  • #numbers: 格式化数字对象的实用方法。
  • #strings:字符串对象的实用方法:包含startsWith,将/附加等。
  • #objects: 实用方法的对象。
  • #bools: 布尔评价的实用方法。
  • #arrays: 数组的实用方法。
  • #lists: list集合。
  • #sets:set集合。
  • #maps: map集合。
  • #aggregates: 实用程序方法用于创建聚集在数组或集合.
  • #messages: 实用程序方法获取外部信息内部变量表达式,以同样的方式,因为他们将获得使用# {…}语法
  • #ids: 实用程序方法来处理可能重复的id属性(例如,由于迭代)。
    Dates
    
    #dates : utility methods for java.util.Date objects:
    /*
    * ======================================================================
    * See javadoc API for class org.thymeleaf.expression.Dates
    * ======================================================================
    */ /*
    * Null-safe toString()
    */
    ${#strings.toString(obj)} // also array*, list* and set* /*
    * Format date with the standard locale format
    * Also works with arrays, lists or sets
    */
    ${#dates.format(date)}
    ${#dates.arrayFormat(datesArray)}
    ${#dates.listFormat(datesList)}
    ${#dates.setFormat(datesSet)} /*
    * Format date with the specified pattern
    * Also works with arrays, lists or sets
    */
    ${#dates.format(date, 'dd/MMM/yyyy HH:mm')}
    ${#dates.arrayFormat(datesArray, 'dd/MMM/yyyy HH:mm')}
    ${#dates.listFormat(datesList, 'dd/MMM/yyyy HH:mm')}
    ${#dates.setFormat(datesSet, 'dd/MMM/yyyy HH:mm')} /*
    * Obtain date properties
    * Also works with arrays, lists or sets
    */
    ${#dates.day(date)} // also arrayDay(...), listDay(...), etc.
    ${#dates.month(date)} // also arrayMonth(...), listMonth(...), etc.
    ${#dates.monthName(date)} // also arrayMonthName(...), listMonthName(...), etc.
    ${#dates.monthNameShort(date)} // also arrayMonthNameShort(...), listMonthNameShort(...), etc.
    ${#dates.year(date)} // also arrayYear(...), listYear(...), etc.
    ${#dates.dayOfWeek(date)} // also arrayDayOfWeek(...), listDayOfWeek(...), etc.
    ${#dates.dayOfWeekName(date)} // also arrayDayOfWeekName(...), listDayOfWeekName(...), etc.
    ${#dates.dayOfWeekNameShort(date)} // also arrayDayOfWeekNameShort(...), listDayOfWeekNameShort(...), etc.
    ${#dates.hour(date)} // also arrayHour(...), listHour(...), etc.
    ${#dates.minute(date)} // also arrayMinute(...), listMinute(...), etc.
    ${#dates.second(date)} // also arraySecond(...), listSecond(...), etc.
    ${#dates.millisecond(date)} // also arrayMillisecond(...), listMillisecond(...), etc. /*
    * Create date (java.util.Date) objects from its components
    */
    ${#dates.create(year,month,day)}
    ${#dates.create(year,month,day,hour,minute)}
    ${#dates.create(year,month,day,hour,minute,second)}
    ${#dates.create(year,month,day,hour,minute,second,millisecond)} /*
    * Create a date (java.util.Date) object for the current date and time
    */
    ${#dates.createNow()} /*
    * Create a date (java.util.Date) object for the current date (time set to 00:00)
    */
    ${#dates.createToday()}
    Calendars #calendars : analogous to #dates, but for java.util.Calendar objects:
    /*
    * ======================================================================
    * See javadoc API for class org.thymeleaf.expression.Calendars
    * ======================================================================
    */ /*
    * Format calendar with the standard locale format
    * Also works with arrays, lists or sets
    */
    ${#calendars.format(cal)}
    ${#calendars.arrayFormat(calArray)}
    ${#calendars.listFormat(calList)}
    ${#calendars.setFormat(calSet)} /*
    * Format calendar with the specified pattern
    * Also works with arrays, lists or sets
    */
    ${#calendars.format(cal, 'dd/MMM/yyyy HH:mm')}
    ${#calendars.arrayFormat(calArray, 'dd/MMM/yyyy HH:mm')}
    ${#calendars.listFormat(calList, 'dd/MMM/yyyy HH:mm')}
    ${#calendars.setFormat(calSet, 'dd/MMM/yyyy HH:mm')} /*
    * Obtain calendar properties
    * Also works with arrays, lists or sets
    */
    ${#calendars.day(date)} // also arrayDay(...), listDay(...), etc.
    ${#calendars.month(date)} // also arrayMonth(...), listMonth(...), etc.
    ${#calendars.monthName(date)} // also arrayMonthName(...), listMonthName(...), etc.
    ${#calendars.monthNameShort(date)} // also arrayMonthNameShort(...), listMonthNameShort(...), etc.
    ${#calendars.year(date)} // also arrayYear(...), listYear(...), etc.
    ${#calendars.dayOfWeek(date)} // also arrayDayOfWeek(...), listDayOfWeek(...), etc.
    ${#calendars.dayOfWeekName(date)} // also arrayDayOfWeekName(...), listDayOfWeekName(...), etc.
    ${#calendars.dayOfWeekNameShort(date)} // also arrayDayOfWeekNameShort(...), listDayOfWeekNameShort(...), etc.
    ${#calendars.hour(date)} // also arrayHour(...), listHour(...), etc.
    ${#calendars.minute(date)} // also arrayMinute(...), listMinute(...), etc.
    ${#calendars.second(date)} // also arraySecond(...), listSecond(...), etc.
    ${#calendars.millisecond(date)} // also arrayMillisecond(...), listMillisecond(...), etc. /*
    * Create calendar (java.util.Calendar) objects from its components
    */
    ${#calendars.create(year,month,day)}
    ${#calendars.create(year,month,day,hour,minute)}
    ${#calendars.create(year,month,day,hour,minute,second)}
    ${#calendars.create(year,month,day,hour,minute,second,millisecond)} /*
    * Create a calendar (java.util.Calendar) object for the current date and time
    */
    ${#calendars.createNow()} /*
    * Create a calendar (java.util.Calendar) object for the current date (time set to 00:00)
    */
    ${#calendars.createToday()}
    Numbers #numbers : utility methods for number objects:
    /*
    * ======================================================================
    * See javadoc API for class org.thymeleaf.expression.Numbers
    * ======================================================================
    */ /*
    * ==========================
    * Formatting integer numbers
    * ==========================
    */ /*
    * Set minimum integer digits.
    * Also works with arrays, lists or sets
    */
    ${#numbers.formatInteger(num,3)}
    ${#numbers.arrayFormatInteger(numArray,3)}
    ${#numbers.listFormatInteger(numList,3)}
    ${#numbers.setFormatInteger(numSet,3)} /*
    * Set minimum integer digits and thousands separator:
    * 'POINT', 'COMMA', 'NONE' or 'DEFAULT' (by locale).
    * Also works with arrays, lists or sets
    */
    ${#numbers.formatInteger(num,3,'POINT')}
    ${#numbers.arrayFormatInteger(numArray,3,'POINT')}
    ${#numbers.listFormatInteger(numList,3,'POINT')}
    ${#numbers.setFormatInteger(numSet,3,'POINT')} /*
    * ==========================
    * Formatting decimal numbers
    * ==========================
    */ /*
    * Set minimum integer digits and (exact) decimal digits.
    * Also works with arrays, lists or sets
    */
    ${#numbers.formatDecimal(num,3,2)}
    ${#numbers.arrayFormatDecimal(numArray,3,2)}
    ${#numbers.listFormatDecimal(numList,3,2)}
    ${#numbers.setFormatDecimal(numSet,3,2)} /*
    * Set minimum integer digits and (exact) decimal digits, and also decimal separator.
    * Also works with arrays, lists or sets
    */
    ${#numbers.formatDecimal(num,3,2,'COMMA')}
    ${#numbers.arrayFormatDecimal(numArray,3,2,'COMMA')}
    ${#numbers.listFormatDecimal(numList,3,2,'COMMA')}
    ${#numbers.setFormatDecimal(numSet,3,2,'COMMA')} /*
    * Set minimum integer digits and (exact) decimal digits, and also thousands and
    * decimal separator.
    * Also works with arrays, lists or sets
    */
    ${#numbers.formatDecimal(num,3,'POINT',2,'COMMA')}
    ${#numbers.arrayFormatDecimal(numArray,3,'POINT',2,'COMMA')}
    ${#numbers.listFormatDecimal(numList,3,'POINT',2,'COMMA')}
    ${#numbers.setFormatDecimal(numSet,3,'POINT',2,'COMMA')} /*
    * ==========================
    * Utility methods
    * ==========================
    */ /*
    * Create a sequence (array) of integer numbers going
    * from x to y
    */
    ${#numbers.sequence(from,to)}
    ${#numbers.sequence(from,to,step)}
    Strings #strings : utility methods for String objects:
    /*
    * ======================================================================
    * See javadoc API for class org.thymeleaf.expression.Strings
    * ======================================================================
    */ /*
    * Check whether a String is empty (or null). Performs a trim() operation before check
    * Also works with arrays, lists or sets
    */
    ${#strings.isEmpty(name)}
    ${#strings.arrayIsEmpty(nameArr)}
    ${#strings.listIsEmpty(nameList)}
    ${#strings.setIsEmpty(nameSet)} /*
    * Perform an 'isEmpty()' check on a string and return it if false, defaulting to
    * another specified string if true.
    * Also works with arrays, lists or sets
    */
    ${#strings.defaultString(text,default)}
    ${#strings.arrayDefaultString(textArr,default)}
    ${#strings.listDefaultString(textList,default)}
    ${#strings.setDefaultString(textSet,default)} /*
    * Check whether a fragment is contained in a String
    * Also works with arrays, lists or sets
    */
    ${#strings.contains(name,'ez')} // also array*, list* and set*
    ${#strings.containsIgnoreCase(name,'ez')} // also array*, list* and set* /*
    * Check whether a String starts or ends with a fragment
    * Also works with arrays, lists or sets
    */
    ${#strings.startsWith(name,'Don')} // also array*, list* and set*
    ${#strings.endsWith(name,endingFragment)} // also array*, list* and set* /*
    * Substring-related operations
    * Also works with arrays, lists or sets
    */
    ${#strings.indexOf(name,frag)} // also array*, list* and set*
    ${#strings.substring(name,3,5)} // also array*, list* and set*
    ${#strings.substringAfter(name,prefix)} // also array*, list* and set*
    ${#strings.substringBefore(name,suffix)} // also array*, list* and set*
    ${#strings.replace(name,'las','ler')} // also array*, list* and set* /*
    * Append and prepend
    * Also works with arrays, lists or sets
    */
    ${#strings.prepend(str,prefix)} // also array*, list* and set*
    ${#strings.append(str,suffix)} // also array*, list* and set* /*
    * Change case
    * Also works with arrays, lists or sets
    */
    ${#strings.toUpperCase(name)} // also array*, list* and set*
    ${#strings.toLowerCase(name)} // also array*, list* and set* /*
    * Split and join
    */
    ${#strings.arrayJoin(namesArray,',')}
    ${#strings.listJoin(namesList,',')}
    ${#strings.setJoin(namesSet,',')}
    ${#strings.arraySplit(namesStr,',')} // returns String[]
    ${#strings.listSplit(namesStr,',')} // returns List<String>
    ${#strings.setSplit(namesStr,',')} // returns Set<String> /*
    * Trim
    * Also works with arrays, lists or sets
    */
    ${#strings.trim(str)} // also array*, list* and set* /*
    * Compute length
    * Also works with arrays, lists or sets
    */
    ${#strings.length(str)} // also array*, list* and set* /*
    * Abbreviate text making it have a maximum size of n. If text is bigger, it
    * will be clipped and finished in "..."
    * Also works with arrays, lists or sets
    */
    ${#strings.abbreviate(str,10)} // also array*, list* and set* /*
    * Convert the first character to upper-case (and vice-versa)
    */
    ${#strings.capitalize(str)} // also array*, list* and set*
    ${#strings.unCapitalize(str)} // also array*, list* and set* /*
    * Convert the first character of every word to upper-case
    */
    ${#strings.capitalizeWords(str)} // also array*, list* and set*
    ${#strings.capitalizeWords(str,delimiters)} // also array*, list* and set* /*
    * Escape the string
    */
    ${#strings.escapeXml(str)} // also array*, list* and set*
    ${#strings.escapeJava(str)} // also array*, list* and set*
    ${#strings.escapeJavaScript(str)} // also array*, list* and set*
    ${#strings.unescapeJava(str)} // also array*, list* and set*
    ${#strings.unescapeJavaScript(str)} // also array*, list* and set* /*
    * Null-safe comparison and concatenation
    */
    ${#strings.equals(str)}
    ${#strings.equalsIgnoreCase(str)}
    ${#strings.concat(str)}
    ${#strings.concatReplaceNulls(str)} /*
    * Random
    */
    ${#strings.randomAlphanumeric(count)}
    Objects #objects : utility methods for objects in general
    /*
    * ======================================================================
    * See javadoc API for class org.thymeleaf.expression.Objects
    * ======================================================================
    */ /*
    * Return obj if it is not null, and default otherwise
    * Also works with arrays, lists or sets
    */
    ${#objects.nullSafe(obj,default)}
    ${#objects.arrayNullSafe(objArray,default)}
    ${#objects.listNullSafe(objList,default)}
    ${#objects.setNullSafe(objSet,default)}
    Booleans #bools : utility methods for boolean evaluation
    /*
    * ======================================================================
    * See javadoc API for class org.thymeleaf.expression.Bools
    * ======================================================================
    */ /*
    * Evaluate a condition in the same way that it would be evaluated in a th:if tag
    * (see conditional evaluation chapter afterwards).
    * Also works with arrays, lists or sets
    */
    ${#bools.isTrue(obj)}
    ${#bools.arrayIsTrue(objArray)}
    ${#bools.listIsTrue(objList)}
    ${#bools.setIsTrue(objSet)} /*
    * Evaluate with negation
    * Also works with arrays, lists or sets
    */
    ${#bools.isFalse(cond)}
    ${#bools.arrayIsFalse(condArray)}
    ${#bools.listIsFalse(condList)}
    ${#bools.setIsFalse(condSet)} /*
    * Evaluate and apply AND operator
    * Receive an array, a list or a set as parameter
    */
    ${#bools.arrayAnd(condArray)}
    ${#bools.listAnd(condList)}
    ${#bools.setAnd(condSet)} /*
    * Evaluate and apply OR operator
    * Receive an array, a list or a set as parameter
    */
    ${#bools.arrayOr(condArray)}
    ${#bools.listOr(condList)}
    ${#bools.setOr(condSet)}
    Arrays #arrays : utility methods for arrays
    /*
    * ======================================================================
    * See javadoc API for class org.thymeleaf.expression.Arrays
    * ======================================================================
    */ /*
    * Converts to array, trying to infer array component class.
    * Note that if resulting array is empty, or if the elements
    * of the target object are not all of the same class,
    * this method will return Object[].
    */
    ${#arrays.toArray(object)} /*
    * Convert to arrays of the specified component class.
    */
    ${#arrays.toStringArray(object)}
    ${#arrays.toIntegerArray(object)}
    ${#arrays.toLongArray(object)}
    ${#arrays.toDoubleArray(object)}
    ${#arrays.toFloatArray(object)}
    ${#arrays.toBooleanArray(object)} /*
    * Compute length
    */
    ${#arrays.length(array)} /*
    * Check whether array is empty
    */
    ${#arrays.isEmpty(array)} /*
    * Check if element or elements are contained in array
    */
    ${#arrays.contains(array, element)}
    ${#arrays.containsAll(array, elements)}
    Lists #lists : utility methods for lists
    /*
    * ======================================================================
    * See javadoc API for class org.thymeleaf.expression.Lists
    * ======================================================================
    */ /*
    * Converts to list
    */
    ${#lists.toList(object)} /*
    * Compute size
    */
    ${#lists.size(list)} /*
    * Check whether list is empty
    */
    ${#lists.isEmpty(list)} /*
    * Check if element or elements are contained in list
    */
    ${#lists.contains(list, element)}
    ${#lists.containsAll(list, elements)} /*
    * Sort a copy of the given list. The members of the list must implement
    * comparable or you must define a comparator.
    */
    ${#lists.sort(list)}
    ${#lists.sort(list, comparator)}
    Sets #sets : utility methods for sets
    /*
    * ======================================================================
    * See javadoc API for class org.thymeleaf.expression.Sets
    * ======================================================================
    */ /*
    * Converts to set
    */
    ${#sets.toSet(object)} /*
    * Compute size
    */
    ${#sets.size(set)} /*
    * Check whether set is empty
    */
    ${#sets.isEmpty(set)} /*
    * Check if element or elements are contained in set
    */
    ${#sets.contains(set, element)}
    ${#sets.containsAll(set, elements)}
    Maps #maps : utility methods for maps
    /*
    * ======================================================================
    * See javadoc API for class org.thymeleaf.expression.Maps
    * ======================================================================
    */ /*
    * Compute size
    */
    ${#maps.size(map)} /*
    * Check whether map is empty
    */
    ${#maps.isEmpty(map)} /*
    * Check if key/s or value/s are contained in maps
    */
    ${#maps.containsKey(map, key)}
    ${#maps.containsAllKeys(map, keys)}
    ${#maps.containsValue(map, value)}
    ${#maps.containsAllValues(map, value)}
    Aggregates #aggregates : utility methods for creating aggregates on arrays or collections
    /*
    * ======================================================================
    * See javadoc API for class org.thymeleaf.expression.Aggregates
    * ======================================================================
    */ /*
    * Compute sum. Returns null if array or collection is empty
    */
    ${#aggregates.sum(array)}
    ${#aggregates.sum(collection)} /*
    * Compute average. Returns null if array or collection is empty
    */
    ${#aggregates.avg(array)}
    ${#aggregates.avg(collection)}
    Messages #messages : utility methods for obtaining externalized messages inside variables expressions, in the same way as they would be obtained using #{...} syntax.
    /*
    * ======================================================================
    * See javadoc API for class org.thymeleaf.expression.Messages
    * ======================================================================
    */ /*
    * Obtain externalized messages. Can receive a single key, a key plus arguments,
    * or an array/list/set of keys (in which case it will return an array/list/set of
    * externalized messages).
    * If a message is not found, a default message (like '??msgKey??') is returned.
    */
    ${#messages.msg('msgKey')}
    ${#messages.msg('msgKey', param1)}
    ${#messages.msg('msgKey', param1, param2)}
    ${#messages.msg('msgKey', param1, param2, param3)}
    ${#messages.msgWithParams('msgKey', new Object[] {param1, param2, param3, param4})}
    ${#messages.arrayMsg(messageKeyArray)}
    ${#messages.listMsg(messageKeyList)}
    ${#messages.setMsg(messageKeySet)} /*
    * Obtain externalized messages or null. Null is returned instead of a default
    * message if a message for the specified key is not found.
    */
    ${#messages.msgOrNull('msgKey')}
    ${#messages.msgOrNull('msgKey', param1)}
    ${#messages.msgOrNull('msgKey', param1, param2)}
    ${#messages.msgOrNull('msgKey', param1, param2, param3)}
    ${#messages.msgOrNullWithParams('msgKey', new Object[] {param1, param2, param3, param4})}
    ${#messages.arrayMsgOrNull(messageKeyArray)}
    ${#messages.listMsgOrNull(messageKeyList)}
    ${#messages.setMsgOrNull(messageKeySet)}
    IDs #ids : utility methods for dealing with id attributes that might be repeated (for example, as a result of an iteration).
    /*
    * ======================================================================
    * See javadoc API for class org.thymeleaf.expression.Ids
    * ======================================================================
    */ /*
    * Normally used in th:id attributes, for appending a counter to the id attribute value
    * so that it remains unique even when involved in an iteration process.
    */
    ${#ids.seq('someId')} /*
    * Normally used in th:for attributes in <label> tags, so that these labels can refer to Ids
    * generated by means if the #ids.seq(...) function.
    *
    * Depending on whether the <label> goes before or after the element with the #ids.seq(...)
    * function, the "next" (label goes before "seq") or the "prev" function (label goes after
    * "seq") function should be called.
    */
    ${#ids.next('someId')}
    ${#ids.prev('someId')}

七.thymeleaf的$和*的区别:

<div th:object="${session.user}">
<p>Name: <span th:text="*{firstName}">Sebastian</span>.</p>
<p>Surname: <span th:text="*{lastName}">Pepper</span>.</p>
<p>Nationality: <span th:text="*{nationality}">Saturn</span>.</p>
</div>

这等同于如下方式:

<div>
<p>Name: <span th:text="${session.user.firstName}">Sebastian</span>.</p>
<p>Surname: <span th:text="${session.user.lastName}">Pepper</span>.</p>
<p>Nationality: <span th:text="${session.user.nationality}">Saturn</span>.</p>
</div>

也可以混用,如下:

<div th:object="${session.user}">
<p>Name: <span th:text="*{firstName}">Sebastian</span>.</p>
<p>Surname: <span th:text="${session.user.lastName}">Pepper</span>.</p>
<p>Nationality: <span th:text="*{nationality}">Saturn</span>.</p>
</div>

当一个对象的选择,选择的对象将也可用美元作为#对象表达变量表达式:

<div th:object="${session.user}">
<p>Name: <span th:text="${#object.firstName}">Sebastian</span>.</p>
<p>Surname: <span th:text="${session.user.lastName}">Pepper</span>.</p>
<p>Nationality: <span th:text="*{nationality}">Saturn</span>.</p>
</div>

如果没有执行对象选择,美元和星号语法是完全等价的:

<div>
<p>Name: <span th:text="*{session.user.name}">Sebastian</span>.</p>
<p>Surname: <span th:text="*{session.user.surname}">Pepper</span>.</p>
<p>Nationality: <span th:text="*{session.user.nationality}">Saturn</span>.</p>
</div>

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