到这篇，基本上Spring Boot框架的各种常用功能都已经总结介绍完了。用过Spring Boot开发过项目之后，我觉得最常用和最需要总结的是两个东西，Spring Data JPA 和 Thymeleaf 语法，因为你了解越多这二者的语法，开发就会变得越加容易。

Spring Data JPA 之前总结过(有兴趣的可以阅读全文 Spring Boot总结(5)---数据访问。

本篇内容主要完整的总结Thymeleaf语法。

Thymeleaf语法

在自己使用Thymeleaf语法时，我非常希望有一篇很全的Thymeleaf语法的总结，但很可惜没有找到，总是零零散散。贴上官方链接（比较长）：Thymeleaf官方说明文档 。现 全面总结 如下：

1. 基本表达式

(1) 变量的表达式：${...}
用于访问 容器上下文环境 中的变量，例：

<p><span th:text="${information}"></span></p>

(2) 选择变量表达式：*{...}
选择表达式计算的是 选定的对象 (th:object对象属性绑定的对象)

<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>

(3) 信息表达式：#{...}
一般用于 显示页面静态文本。将可能需要根据需求而整体变动的静态文本放在properties文件中，方便维护。通常与th:text属性一起使用。例如：
新建/WEB-INF/templates/home.html，段落：

<p th: text=" #{home. welcome}" >This text will not be show! </p>

新建/WEB-INF/templates/home.properties，home.welcome：

home.welcome=this messages is from home.properties！

显示效果为：

显示效果

(4) 链接URL表达式:@{...}
用于链接。可以链接目录下的静态资源，也可以链接到后端请求处理接口，如：

<link th:src="@{/resources/css/bootstrap.min.css}" />

<li><a th:href="@{/forIndex}">首页</a></li>

(5) 工具对象表达式#maps
常用于 日期、集合、数组对象的访问 。这些工具对象就像是java对象，可以访问对应java对象的方法来进行各种操作。

<div th:if="${#maps.size(stu)!=0}">
...do something...
</div>

常用的对象表达式总结如下：

#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)。
#httpServletRequest:用于web应用中获取request请求的参数
#session:用于web应用中获取session的参数

具体用法代码示例如下，可自行ctrl+F搜索寻找自己需要的：

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')}

Request

<p th:text="${#httpServletRequest.getParameter('q')}" >Test</p>

Session

<div th:text="${session.xx}">[...]</div>

2. 常用属性

Thymeleaf语法的使用，都是通过在html页面的标签中添加th:xx关键字来实现模板套用，且其属性与html页面标签基本类似。常用属性有：

th:action      表单提交的地址    　　　       <form action="subscribe.html" th:action="@{/subscribe}">
th:each        属性赋值    　　　　　　　   　 <tr th:each="user,userStat:${users}">
th:field       常用于表单字段绑定             <input type="text" value="" th:field="*{username}"></input>
th:href        链接地址    　　　　　　　    　<a th:href="@{/login}" th:unless=${session.user != null}>Login</a> />
th:id    　　   替换id    　　　       　     <input th:id="'xxx' + ${collect.id}"/>
th:if          判断条件    　　　　          　<a th:if="${userId == collect.userId}" >
th:include     布局标签，替换内容到引入的文件     <head th:include="layout :: htmlhead" th:with="title='xx'"></head> />
th:fragment    布局标签，定义代码片段，其它引用   <div th:fragment="alert">
th:object      替换对象    　　　            　 <div th:object="${session.user}">
th:src         图片类地址引入    　　          　![](@{/img/logo.png})
th:replace     布局标签，替换整个标签到引入的文件  <div th:replace="fragments/header :: title"></div>
th:text    　  文本替换    　　               　<p th:text="${collect.description}">description</p>
th:value       属性赋值    　　                <input th:value="${user.name}" />
th:inline      定义js脚本可以使用变量           <script type="text/javascript" th:inline="javascript">
th:remove      删除某个属性    　　　        　 <tr th:remove="all"> 
th:style       设置样式    　　　　　　　　      th:style="'display:' + @{(${sitrue} ? 'none' : 'inline-block')} + ''"
th:onclick     点击事件    　　　　　　         th:onclick="'getCollect()'"

(1) th:action：
定义后台控制器路径，类似<form>标签的action属性。例如：

<form id="login-form" th:action="@{/login}">...</form>

(2) th:each：
对象遍历，功能类似jsp中的<c:forEach>标签。用于遍历展示或者遍历录入。例如：

<form id="login-form" th:action="@{/addStudent}" 

th:object="${stuReqBean}" method="POST">

<div class="student" th:each="stuIter,rowStat:${stuReqBean.students}">

<input type="text" class="firstName" value="" 

th:field="*{students[__${rowStat.index}__].firstName}"></input>

<input type="text" class="school" value="" 

th:field="*{students[__${rowStat.index}__].school}"></input>

...

</div>

</form>

//后台代码
@RequestMapping(value = "/addStudent", method = RequestMethod.POST)

public String addStudent(@ModelAttribute(value = "stuReqBean") 

StudentRequestBean stuReqBean，ModelMap model) {...}

(3) th:field:
常用于表单字段绑定。通常与th:object一起使用。 属性绑定、集合绑定。

<form id="login-form" th:action="@{/login}" th:object="${loginBean}">...

<input type="text" value="" th:field="*{username}"></input>

<input type="text" value="" th:field="*{user[0].username}"></input>

</form>

(4) th:href:
定义超链接，类似<a>标签的href 属性。value形式为@{/logout}

<a th:href="@{/logout}" class="signOut"></a>

(5) th:id:
div id声明，类似html标签中的id属性。

<div class="student" th:id = "stu+(${rowStat.index}+1)"></div>

(6) th:if:
条件判断。如果为否则标签不显示，例如：

<div th:if="${rowStat.index} == 0">... do something ...</div>

(7) th:include&th:fragment:
声明定义该属性的div为模板片段，常用与头文件、页尾文件的引入。常与th:include，th:replace一起使用。
声明模板片段/WEBINF/templates/footer. html :

<div th: fragment=" copy" >

© 2011 The Good Thymes Virtual Grocery

</div>

引入模板片段：

<div th: include=" /templates/footer : : copy" ></div>

<div th: replace=" /templates/footer : : copy" ></div>
</div>

(8) th:object:
用于表单数据对象绑定，将表单绑定到后台controller的一个JavaBean参数。常与th:field一起使用进行表单数据绑定。

public class LoginBean implements Serializable{...}


@RequestMapping(value = "/login", method = RequestMethod.POST)

public String login(@ModelAttribute(value = "loginBean") LoginBean loginBean，ModelMap model) {...}

<form id="login-form" th:action="@{/login}" th:object="${loginBean}">...</form>

(9) th:src:
用于外部资源引入，类似于<script>标签的src属性，常与@{}一起使用。

<script th:src="@{/resources/js/jquery/jquery.json-2.4.min.js}"

(10) th:text:
文本显示。

<td class="text" th:text="${username}" ></td>

(11) th:value:
用于标签复制，类似<option>标签的value属性。

<option th:value="Adult">Adult</option>

<input  id="msg" type="hidden" th:value="${msg}" />

(12) th:inline:
定义js脚本可以使用变量。

<script th:inline="javascript">
    //提交表单
    function form_submit() {
        var data={
            userId:[[${userId}]], //js引用后端传来的值
            role:[[${role}]],
            password:$("#password").val(),
        }
 $.post("xx",data,function (mes) {
          ...xxx...
        })

(12) th:remove:
用于移除标签。

<a th:remove="${status}!=0?all:none" >未提交</a>

(13) th: style:
用于修改标签style。

<span   th:style="'display:' + @{(${sitrue} ? 'none' : 'inline-block')} + ''"></span>

(14) th: onclick:
用于修改点击事件。

<button   th:onclick="'getCollect()'"></button>

3. 标准表达式

(1) 字面
文本文字：放在 单引号 里面,可以是任意字符，如：'one text'，'Another one!'，...

<span th:text="'working web application'">template file</span>

数字文字：0，34，3.0，12.3，...

<span th:text="2013">1492</span>

布尔文字：true，false

<div th:if="${user.isAdmin()} == false">

空字面： null

<div th:if="${variable.something} == null">  

(2) 文字操作：

字符串连接： +

<span th:text="'Welcome to our application, ' + ${user.name} + '!'">

文字替代： |The name is ${name}|

<span th:text="|Welcome to our application, ${user.name}!|">

(3) 算术运算：
二元运算符：+，-，*，/，%

<span th:text="1+1">1+1</span>

(4) 布尔运算：
二元运算符：and，or
布尔否定（一元运算符）： !，not

<span  th:if="${!#lists.isEmpty(list)} and ${#lists.isEmpty(list)}" >and</span>

<span  th:if="${!#lists.isEmpty(list)} or ${#lists.isEmpty(list)}" >or</span>

<span  th:if="${!#lists.isEmpty(list)}">not</span>

(5) 比较和相等：
比较：>，<，>=，<=（gt，lt，ge，le）
相等判断：==，!=（eq，ne）

<ol>   
<li>>(gt)：<span th:text="1+1" th:if="${#lists.size(list)} > 1">大于></span>else</li>   
<li>小于lt：<span th:if="${#lists.size(list)} lt 1">小于</span>else</li>   
<li>>=(ge)：<span  th:if="${#lists.size(list)} >= 1">大于等于>=</span>else</li>   
<li>小于等于(le)：<span  th:if="${#lists.size(list)} le 1">小于等于</span>else</li>   
<li>!(not)：<span  th:if="${!#lists.isEmpty(list)}">!(not)</span>else</li>   
<li>==(eq)：<span th:text="'Execution mode is ' + ( (${execMode} == 'dev')? 'Development' : 'Production')">等于==</span></li>   
<li>!=(ne/neq)：size:<span th:text="${#lists.size(list)}" th:if="${#lists.size(list)} != 1"></span></li>
</ol>

(6) 条件运算符：
IF-THEN： (if) ? (then)

<span th:class="${title1} ? 'green'">样例</span>

IF-THEN-ELSE： (if) ? (then) : (else)

<span th:class="${title} ? 'green' :' red'">样例一</span>

默认： (value) ?: (defaultvalue)

 <span th:text="*{age}?: '(no age specified)'">20</span>

至此，Thymeleaf的语法用法已经基本描述完毕。详细阅读此篇，可以让大家在使用Thymeleaf模板引擎时事半功倍。

贴几个很好的Thymeleaf总结参考博客，这些博主都写得很好。本文部分内容摘录自这些博客。
雪山上的蒲公英---Thymeleaf
ITPSC---Thymeleaf
指尖舞步---Thymeleaf