Thymeleaf实战

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Thymeleaf

理解Thymeleaf

Java模版引擎：Thymeleaf是一个用于Web和独立环境的现代服务器端Java模板引擎。能够处理HTML、XML、JavaScript、CSS甚至纯文本。

自然模板：Thymeleaf的主要目标是为您的开发工作流程带来优雅的自然模板——HTML，它可以在浏览器中正确显示，也可以作为静态原型工作（原型即界面），改善了设计与开发的沟通，从而在开发团队中实现更强的协作。

<table>
  <thead>
    <tr>
      <th th:text="#{msgs.headers.name}">Name</th>
      <th th:text="#{msgs.headers.price}">Price</th>
    </tr>
  </thead>
  <tbody>
    <tr th:each="prod: ${allProducts}">
      <td th:text="${prod.name}">Oranges</td>
      <td th:text="${#numbers.formatDecimal(prod.price, 1, 2)}">0.99</td>
    </tr>
  </tbody>
</table>

语法优雅易懂：
遵从web标准，支持HTML5

Thymeleaf 使用

一、标准方言

秉着“开箱即用”的原则，Thymeleaf提供了满足大多数情况下的默认实现-标准方言（后面会介绍自定义方言）：

引入标签库（命名空间），常用的一种方式：
```
<span th:text="">....</span>
```
需要引入命名空间
```
<html xmlns:th="http://www.thymeleaf.org">
```

HTML5标准，自定义属性:

<span data-th-text="">.....</span>

<table>
    <tr data-th-each="user : ${users}">
        <td data-th-text="${user.login}">...</td>
        <td data-th-text="${user.name}">...</td>
    </tr>
</table>

这样可以省去命名空间

Thymeleaf基本语法

标准表达式

变量表达式

语法：${...}
用法：
```
<p th:text="${book.author}"></p>
```

消息表达式

语法：#{...}
用法：
```
<p th:text="#{home.welcome}">Welcome to our grocery store!</p>
```
相当于消息的一个key，也称文本外部化，一般用于国际化等外部配置文件，其中properties文件内容为
```
home.welcome=welcome to thymeleaf
```
目前消息文件中的内容是固定的，如果我们需要向消息中动态插入一个参数以便实现动态消息，可以#{messageKey(param=value)}，多个参数用,分割-#{messageKey(param1=value1， param2=value2)}，messageKey本身也可以是一个变量表达式：

home.welcome=welcome to {0}

<p th:utext="#{home.welcome(${session.user.name})}"> 
       Welcome to our grocery store, Sebastian Pepper! 
</p>

<p th:utext="#{${welcomeMsgKey}(${session.user.name})}">
  Welcome to our grocery store, Sebastian Pepper!
</p>

消息源

大多数情况下, 消息源是.properties文件，同时可以自定义其他消息源，比如数据库。消息源通过org.thymeleaf.messageresolver.IMessageResolver获取，如果在初始化模板引擎时没有自定义的IMessageResolver被提供，那么一个默认的实现org.thymeleaf.messageresolver.StandardMessageResolver会被自动提供。

StandardMessageResolver查找和模板文件位于同级目录，且具有和模板文件相同名字的.properties文件。

模板/templates/home.html在渲染时，会根据local设置，使用下面的消息源文件

/templates/home_zh_CN.properties --->中文
/templates/home_en.properties --->英文
/templates/home.properties 如--->特定的lcoal不可用时使用

在spring boot中，默认去寻找resources下面名为messages的properties文件，可以通过spring.messages.basename进行修改

选择表达式

语法：*{...}

示例：

<div th:object="${session.book}">
    <p>Name: <span th:text="*{title}">thymeleaf实战</span>.</p>
    <p>Surname: <span th:text="*{author}">Peppa</span>.</p>
    <p>Nationality: <span th:text="*{price}">300</span>.</p>
  </div>

与变量表达式的区别：它们是在当前选择的对象而不是整个上下文变量映射上执行（性能高）

链接表达式

语法：@{...}
示例

绝对url:

<a th:href="@{http://www.thymeleaf.org}" th:text="">...</>

相对url，可以是:
- 相对url: user/login.html
- 上下文相对: /itemdetails?id=3 (自动添加服务器中的应用上下文名称)
- 服务器相对: ~/billing/processInvoice (允许在同一服务器的另一个上下文（=应用程序）中调用URL）.
- 协议相对: //code.jquery.com/jquery-2.0.3.min.js

eg：

在链接中使用参数（变量）
<a href="details.html" th:href="@{/order/details(orderId=${o.id})}">view</a>
多个参数：

<a href="details.html" th:href="@{/order/details(orderId=${o.id},orderType=${o.type})}">view</a>
RESTful风格：

<a href="details.html" th:href="@{/order/{orderId}/details(orderId=${orderId})}">view</a>

片段表达式

片段表达式是表示标记片段并围绕模板移动它们的简单方法。这允许我们复制它们，将它们作为参数传递给其他模板，等等

语法：~{...}

示例：

<div th:align="center" th:fragment="footer">
....
</div>

定义片段

<div th:insert="~{commons :: footer}">...</div>

使用th:insert or th:replace插入片段，它们可以在任何地方使用，就像任何其他变量一样：

<div th:with="frag=~{footer :: #footer/text()}">
  <p th:insert="${frag}">
</div>

Thymeleaf基本语法

字面量

文本字面量: 'one text', 'Another one!',…

<p th:text="'<h1>我是一个香蕉，蕉蕉蕉蕉蕉蕉</h1>'"</p>

<p th:utext="'<h1>我是一个香蕉，蕉蕉蕉蕉蕉蕉</h1>'"</p>

区别：th：text对html标签转义，th：utext不转义，解析为html内容

数字字面量: 0, 34, 3.0, 12.3,…
Boolean 字面量: true, false
Null 值字面量: null
文字标记: one, sometext, main,…（不需要单引号''，这些令牌允许在标准表达式中进行一点简化。它们的工作与文本文字（'...'）完全相同，但它们只允许使用字母（A-Z和a-z），数字（0-9），括号（[和]），点（.），连字符（-）和下划线（_）。所以没有空白，没有逗号等）

文本操作:
- 字符串连接: +
- 文字替换: |The name is ${name}|
算术运算符:
- 二元运算符: +, -, *, /, %
- 减号(一元运算): -
逻辑运算符:
- 二元运算符: and, or
- 逻辑非(一元运算符): !, not
比较运算符:
- 比较运算符: >, <, >=, <= (gt, lt, ge, le)
- 相等比较: ==, != (eq, ne)
条件运算符:
- If-then: (if) ? (then)
- If-then-else: (if) ? (then) : (else)
- Default: (value) ?: (defaultvalue)
Special tokens:
- No-Operation（无操作）: _ 如果条件不满足，保留在原型中定义的值（文本）

<p th:utext="${user.username}?:_">我是原型的值</p>

设置属性值

Java模版引擎：Thymeleaf是一个用于Web和独立环境的现代服务器端Java模板引擎。能够处理

设置任意属性值-->th:attr

<form action="subscribe.html" th:attr="action=@{/subscribe}">
  <fieldset>
    <input type="text" name="email" />
    <input type="submit" value="Subscribe!" th:attr="value=#{subscribe.submit}"/>
  </fieldset>
</form>

设置值到指定的属性---->HTML5标签的常用属性。如：

<input type="submit" value="Subscribe!" th:value="#{subscribe.submit}"/>

<form action="subscribe.html" th:action="@{/subscribe}">

<li><a href="product/list.html" th:href="@{/product/list}">Product List</a></li>

固定值布尔属性---->属性就代表值

<input type="checkbox" name="active" th:checked="${user.active}" />

迭代器
基本的迭代---->th:each
```
<li th:each="book:${books}" th:text="${book.title}"></li>
```
- ${books}为迭代变量（作用域中的Iterable，Enumeration，Iterator，Map，Entry，Array及字符串等，相当于标准标签库中<c:forEach>里的items属性）；
- book为当前迭代的元素，相当于var属性
状态变量：跟踪迭代器的状态（相当于标准标签库的varStatus标签）
```
<table>
  <tr>
    <th>NAME</th>
    <th>PRICE</th>
    <th>IN STOCK</th>
  </tr>
  <tr th:each="prod,iterStat : ${prods}" th:class="${iterStat.odd}? 'odd'">
    <td th:text="${prod.name}">Onions</td>
    <td th:text="${prod.price}">2.41</td>
    <td th:text="${prod.inStock}? #{true} : #{false}">yes</td>
  </tr>
</table>
```
- index：当前迭代索引，从0开始。
- count：当前迭代索引，从1开始。
- size：迭代变量中元素的总数。
- current：每个迭代的ITER变量。
- even/odd:当前迭代是偶数还是奇数。
- first:当前迭代是否为第一个元素。
- last：当前迭代是否为最后一个元素。
条件语句

th:if

<a href="comments.html"
   th:href="@{/product/comments(prodId=${prod.id})}" 
   th:if="${not #lists.isEmpty(prod.comments)}">view</a>

th:unless---->条件不成立

<a href="comments.html"
   th:href="@{/comments(prodId=${prod.id})}" 
   th:unless="${#lists.isEmpty(prod.comments)}">view</a>

th:switch/th:case

<div th:switch="${user.role}">
  <p th:case="'admin'">User is an administrator</p>
  <p th:case="#{roles.manager}">User is a manager</p>
  <p th:case="*">User is some other thing</p>
</div>

模板布局
在我们的模板中，我们通常希望包括来自其他模板的部件，如页脚、页眉、菜单等部件（公共部分）；或是固定的模板格式渲染成不同的内容，如邮件模板，商品详情页模板…
为了做到这一点，thymeleaf需要我们定义这些部分，“片段”，以便包含，这可以使用th:fragment属性完成。
假设我们想在所有杂货店页面中添加一个标准的版权页脚，那么我们创建一个/templates/footer.html文件，其中包含以下代码：
```
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
  <body>
    <div th:fragment="copy">
      &copy; 2011 The Good Thymes Virtual Grocery
    </div>
  </body>
</html>
```
使用th:insert或者th:replace插入片段，th:include只插入片段内容（不推荐使用）
```
<body>

  ...

  <div th:insert="~{footer :: copy}"></div>
  
</body>
```
其中footer为模板名称，copy为片段名称，也可以不使用th:fragment,使用格式如下
```
<div id="copy-section">
  &copy; 2011 The Good Thymes Virtual Grocery
</div>
...

<body>

  ...

  <div th:insert="~{footer :: #copy-section}"></div>
  
</body>
```
注释
标准html/xml注释

thymeleaf解析器级注释

<!--/*
  <div th:text="${...}">
    ...
  </div>
*/-->

原型注释块[静态时注释，模板执行时显示

<!--/*/
  <div th:text="${...}">
    ...
  </div>
/*/-->

内联

直接将表达式写在文本中而非标签中，js，css中使用常见

<script th:inline="javascript">
    ...
    var username = [[${session.user.name}]];
    ...
</script>

格式：[[...]]或者[(...)]分别对应th:text和th:utext
禁用内联---->th:inline="none"
表达式基本对象（隐式对象，存在于上下文中）

#ctx：上下文对象

/*
 * ======================================================================
 * See javadoc API for class org.thymeleaf.context.IContext
 * ======================================================================
 */
${#ctx.locale}
${#ctx.variableNames}

/*
 * ======================================================================
 * See javadoc API for class org.thymeleaf.context.IWebContext
 * ======================================================================
 */

${#ctx.request}
${#ctx.response}
${#ctx.session}
${#ctx.servletContext}

#locale：直接访问与java.util.Locale关联的当前请求
```
${#locale}
```

param，获取请求相关的属性，如请求参数，request.getParmeter("")等

/*
 * ============================================================================
 * See javadoc API for class org.thymeleaf.context.WebRequestParamsVariablesMap
 * ============================================================================
 */

${param.foo}  //request.getParameterValues("foo")            
${param.size()}
${param.isEmpty()}
${param.containsKey('foo')}
...

session : for retrieving session attributes.

/*
 * ======================================================================
 * See javadoc API for class org.thymeleaf.context.WebSessionVariablesMap
 * ======================================================================
 */

${session.foo}  // session.getAtttribute('foo')
${session.size()}
${session.isEmpty()}
${session.containsKey('foo')}
...

application : for retrieving application/servlet context attributes.

/*
 * =============================================================================
 * See javadoc API for class org.thymeleaf.context.WebServletContextVariablesMap
 * =============================================================================
 */

${application.foo}      //servletContext.getAtttribute('foo')
${application.size()}
${application.isEmpty()}
${application.containsKey('foo')}
...

${myRequestAttribute}

Web 上下文对象

#request : 当前请求javax.servlet.http.HttpServletRequest .

${#request.getAttribute('foo')}
${#request.getParameter('foo')}
${#request.getContextPath()}
${#request.getRequestName()}
...

#session : javax.servlet.http.HttpSession

${#session.getAttribute('foo')}
${#session.id}
${#session.lastAccessedTime}
...

#servletContext : javax.servlet.ServletContext

${#servletContext.getAttribute('foo')}
${#servletContext.contextPath}
...

块
标准方言中包含的thymeleaf的唯一元素处理器（不是属性）是th:block。
th:block是一个属性容器，允许模板开发人员指定他们想要的属性。thymeleaf将执行这些属性，然后简单地使块（而不是其内容）消失。
因此，它可能很有用，例如，当创建迭代表时，每个元素需要一个以上的<tr>,或者需要条件判断时
```
<table>
  <th:block th:each="user : ${users}">
    <tr>
        <td th:text="${user.login}">...</td>
        <td th:text="${user.name}">...</td>
    </tr>
    <tr>
        <td colspan="2" th:text="${user.address}">...</td>
    </tr>
  </th:block>
</table>
```

实用对象

这些使用表达式对象在package org.thymeleaf.expression包下都有对应的类，如果不知道怎么使用直接看Javadoc就好，推荐使用的时候按需查询。

Messages

#messages : 用于在变量表达式中获得外部消息的实用方法，与使用#{…}语法获得的方式相同.

/*
 * ======================================================================
 * See javadoc API for class org.thymeleaf.expression.Messages
 * ======================================================================
 */

${#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)}

${#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)}

URIs/URLs

#uris : 用于在Thymeleaf标准表达式中执行URI / URL操作（特别是转义/消除转义）的实用对象.

/*
 * ======================================================================
 * See javadoc API for class org.thymeleaf.expression.Uris
 * ======================================================================
 */

/*
 * Escape/Unescape as a URI/URL path
 */
${#uris.escapePath(uri)}
${#uris.escapePath(uri, encoding)}
${#uris.unescapePath(uri)}
${#uris.unescapePath(uri, encoding)}

/*
 * Escape/Unescape as a URI/URL path segment (between '/' symbols)
 */
${#uris.escapePathSegment(uri)}
${#uris.escapePathSegment(uri, encoding)}
${#uris.unescapePathSegment(uri)}
${#uris.unescapePathSegment(uri, encoding)}

/*
 * Escape/Unescape as a Fragment Identifier (#frag)
 */
${#uris.escapeFragmentId(uri)}
${#uris.escapeFragmentId(uri, encoding)}
${#uris.unescapeFragmentId(uri)}
${#uris.unescapeFragmentId(uri, encoding)}

/*
 * Escape/Unescape as a Query Parameter (?var=value)
 */
${#uris.escapeQueryParam(uri)}
${#uris.escapeQueryParam(uri, encoding)}
${#uris.unescapeQueryParam(uri)}
${#uris.unescapeQueryParam(uri, encoding)}

Conversions

#conversions : 允许在模板的任意位置执行转换服务的实用程序对象:

/*
 * ======================================================================
 * See javadoc API for class org.thymeleaf.expression.Conversions
 * ======================================================================
 */

/*
 * Execute the desired conversion of the 'object' value into the
 * specified class.
 */
${#conversions.convert(object, 'java.util.TimeZone')}
${#conversions.convert(object, targetClass)}

Dates

#dates : 为 java.util.Date对象提供工具方法,比如：格式化,提取年月日等:

/*
 * ======================================================================
 * See javadoc API for class org.thymeleaf.expression.Dates
 * ======================================================================
 */

${#dates.format(date)}
${#dates.arrayFormat(datesArray)}
${#dates.listFormat(datesList)}
${#dates.setFormat(datesSet)}

${#dates.formatISO(date)}
${#dates.arrayFormatISO(datesArray)}
${#dates.listFormatISO(datesList)}
${#dates.setFormatISO(datesSet)}


${#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')}

${#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()}

${#dates.createNowForTimeZone()}

/*
 * Create a date (java.util.Date) object for the current date (time set to 00:00)
 */
${#dates.createToday()}

${#dates.createTodayForTimeZone()}

Calendars

#calendars : 类似于#dates , 但是只针对java.util.Calendar对象:

/*
 * ======================================================================
 * 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 ISO8601 format
 * Also works with arrays, lists or sets
 */
${#calendars.formatISO(cal)}
${#calendars.arrayFormatISO(calArray)}
${#calendars.listFormatISO(calList)}
${#calendars.setFormatISO(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)}

${#calendars.createForTimeZone(year,month,day,timeZone)}
${#calendars.createForTimeZone(year,month,day,hour,minute,timeZone)}
${#calendars.createForTimeZone(year,month,day,hour,minute,second,timeZone)}
${#calendars.createForTimeZone(year,month,day,hour,minute,second,millisecond,timeZone)}

/*
 * Create a calendar (java.util.Calendar) object for the current date and time
 */
${#calendars.createNow()}

${#calendars.createNowForTimeZone()}

/*
 * Create a calendar (java.util.Calendar) object for the current date (time set to 00:00)
 */
${#calendars.createToday()}

${#calendars.createTodayForTimeZone()}

Numbers

#numbers : 为数值型对象提供工具方法:

/*
 * ======================================================================
 * 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', 'WHITESPACE', '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')}


/* 
 * =====================
 * Formatting currencies
 * =====================
 */

${#numbers.formatCurrency(num)}
${#numbers.arrayFormatCurrency(numArray)}
${#numbers.listFormatCurrency(numList)}
${#numbers.setFormatCurrency(numSet)}

/* 
 * ======================
 * Formatting percentages
 * ======================
 */

${#numbers.formatPercent(num)}
${#numbers.arrayFormatPercent(numArray)}
${#numbers.listFormatPercent(numList)}
${#numbers.setFormatPercent(numSet)}

/* 
 * Set minimum integer digits and (exact) decimal digits.
 */
${#numbers.formatPercent(num, 3, 2)}
${#numbers.arrayFormatPercent(numArray, 3, 2)}
${#numbers.listFormatPercent(numList, 3, 2)}
${#numbers.setFormatPercent(numSet, 3, 2)}

/*
 * ===============
 * 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 : 为String 对象提供工具方法。如: contains, startsWith, prepending/appending等:

Objects

#objects : 为object 对象提供常用的工具方法

/*
 * ======================================================================
 * 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 : 为boolean 对象提供常用的工具方法

/*
 * ======================================================================
 * See javadoc API for class org.thymeleaf.expression.Bools
 * ======================================================================
 */

Arrays

#arrays : 为arrays 对象提供常用的工具方法；

/*
 * ======================================================================
 * 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 :为lists对象提供常用的工具方法

/*
 * ======================================================================
 * 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 : 为lists对象提供常用的工具方法

/*
 * ======================================================================
 * 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 : 为lists对象提供常用的工具方法

/*
 * ======================================================================
 * 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 : 为创造一个arrays 或者 collections聚集函数提供常用的工具方法

/*
 * ======================================================================
 * 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)}

IDs

#ids :为可能需要循环的ID属性提供常用的工具方法.

/*
 * ======================================================================
 * 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')}

下一章节介绍在spring mvc中使用以及在springboot中使用

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Spring MVC组件开发-文件上传 | spring mvc 对RESTful的支持

2019-05-29 23:36
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