thymeleaf学习

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：0, 34, 3.0, 12.3,…

　　3.布尔型常量：true, false

　　4.空的文字：null

　　5.文字标记：one, sometext, main,…

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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