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：

1	`<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 forboolean 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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