• Thymeleaf学习（3）—— 内置对象

    一. 基本对象

    1. #request

            #request表示HttpServletRequest对象

    2. #session

            #session表示HttpSession对象

            session是#session的简单表示形式，是map对象，用来获取session域中指定key的值 

    3. #servletContext

            #servletContext表示servletContext对象

            application是#servletContext的简单表示形式，用来获取servletContext域中key的值

    4. param

            param对象表示请求参数的集合

    1. html>
    3. <html lang="en" xmlns:th="http://www.thymeleaf.org">
    4. <head>
    5.     <meta charset="UTF-8">
    6.     <title>Titletitle>
    7. head>
    8. <body>
    9.     <div>
    10.         获取request域中的对象 <br/>
    11.         <p th:text="${#request.getAttribute('requestName')}">p>
    12.         <p th:text="${requestName}">p>
    13.     div>
    14.  
    15.     <div>
    16.         获取session域中的对象 <br/>
    17.         <p th:text="${#session.getAttribute('sessionName')}">p>
    18.         <p th:text="${session.sessionName}">p>
    19.     div>
    20.  
    21.     <div>
    22.         获取application域中的对象 <br/>
    23.         <p th:text="${#servletContext.getAttribute('applicationName')}">p>
    24.         <p th:text="${application.applicationName}">p>
    25.     div>
    26.  
    27.     <div>
    28.         获取参数的内容 <br/>
    29.         发送name参数的值：<span th:text="${param.name}">span> <br/>
    30.         参数的个数：<span th:text="${param.size()}">span>
    31.     div>
    32.  
    33.  
    34.     <div>
    35.         内置对象的方法 <br/>
    36.         <p th:text="${#request.getRequestURL()}">p>
    37.         <p th:text="${#request.getRequestURI()}">p>
    38.         <p th:text="${#request.getContextPath()}">p>
    39.         <p th:text="${#request.getServerName()}">p>
    40.         <p th:text="${#request.getServerPort()}">p>
    41.  
    42.         <p th:text="${#session.getId()}">p>
    43.     div>
    44. body>
    45. html>
    1. package com.xdu.studyspringboot.controller;
    2.  
    3. import org.springframework.stereotype.Controller;
    4. import org.springframework.web.bind.annotation.RequestMapping;
    5.  
    6. import javax.servlet.ServletContext;
    7. import javax.servlet.http.HttpServletRequest;
    8. import javax.servlet.http.HttpSession;
    9.  
    10. @Controller
    11. public class ThymeleafController {
    12.     @RequestMapping("/httpObject")
    13.     public String testHttpObject(HttpServletRequest request, HttpSession session, String name){
    14.         request.setAttribute("requestName", "Tom");
    15.         session.setAttribute("sessionName", "Jack");
    16.         ServletContext application = request.getServletContext();
    17.         application.setAttribute("applicationName", "Mike");
    18.         return "test";
    19.     }
    20. }

    二. 工具类对象

    1. #dates（日期对象）

    1. html>
    3. <html lang="en" xmlns:th="http://www.thymeleaf.org">
    4. <head>
    5.     <meta charset="UTF-8">
    6.     <title>Titletitle>
    7. head>
    8. <body>
    9.     #dates日期对象 <br/>
    10.     <p th:text="${#dates.format(myDate)}">p>             
    11.     <p th:text="${#dates.format(myDate, 'yyyy-MM-dd')}">p>        
    12.     <p th:text="${#dates.format(myDate, 'yyyy-MM-dd HH:mm:ss')}">p>  
    13.  
    14.     <p th:text="${#dates.year(myDate)}">p>   
    15.     <p th:text="${#dates.month(myDate)}">p>   
    16.  
    17.     <p th:text="${#dates.createNow()}">p>   
    18.  
    19. body>
    20. html>
    1. package com.xdu.studyspringboot.controller;
    2.  
    3. import org.springframework.stereotype.Controller;
    4. import org.springframework.web.bind.annotation.RequestMapping;
    5.  
    6. import javax.servlet.http.HttpServletRequest;
    7. import java.util.Date;
    8.  
    9. @Controller
    10. public class ThymeleafController {
    11.     @RequestMapping("/utilObject")
    12.     public String testUtilObject(HttpServletRequest request){
    13.        request.setAttribute("myDate", new Date());
    14.         return "test";
    15.     }
    16. }

    2. #strings

    1. html>
    3. <html lang="en" xmlns:th="http://www.thymeleaf.org">
    4. <head>
    5.     <meta charset="UTF-8">
    6.     <title>Titletitle>
    7. head>
    8. <body>
    9.  
    10.     <p th:text="${#strings.toUpperCase(myStr)}">p>        
    11.     <p th:text="${#strings.indexOf(myStr,'ll')}">p>       
    12.     <p th:text="${#strings.substring(myStr, 2, 5)}">p>    
    13.     <p th:text="${#strings.concat(myStr, 'Java')}">p>     
    14.     <p th:text="${#strings.length(myStr)}">p>             
    15.     <p th:text="${#strings.length('happy')}">p>           
    16.     <p th:text="${#strings.contains(myStr, 'hello')}">p>  
    17.  
    18. body>
    19. html>
    1. package com.xdu.studyspringboot.controller;
    2.  
    3. import org.springframework.stereotype.Controller;
    4. import org.springframework.web.bind.annotation.RequestMapping;
    5.  
    6. import javax.servlet.http.HttpServletRequest;
    7.  
    8. @Controller
    9. public class ThymeleafController {
    10.     @RequestMapping("/utilObject")
    11.     public String testUtilObject(HttpServletRequest request){
    12.        request.setAttribute("myStr", "hello world");
    13.         return "test";
    14.     }
    15. }

    3. #lists

    1. html>
    3. <html lang="en" xmlns:th="http://www.thymeleaf.org">
    4. <head>
    5.     <meta charset="UTF-8">
    6.     <title>Titletitle>
    7. head>
    8. <body>
    9.  
    10.     <p th:text="${#lists.size(myList)}">p>           
    11.     <p th:text="${#lists.contains(myList, 1)}">p>    
    12.     <p th:text="${#lists.isEmpty(myList)}">p>        
    13.     <p th:text="${#lists.sort(myList)}">p>           
    14.  
    15. body>
    16. html>
    1. package com.xdu.studyspringboot.controller;
    2.  
    3. import org.springframework.stereotype.Controller;
    4. import org.springframework.web.bind.annotation.RequestMapping;
    5.  
    6. import javax.servlet.http.HttpServletRequest;
    7. import java.util.ArrayList;
    8. import java.util.List;
    9.  
    10. @Controller
    11. public class ThymeleafController {
    12.     @RequestMapping("/utilObject")
    13.     public String testUtilObject(HttpServletRequest request){
    14.         List list = new ArrayList<>();
    15.         list.add(1);
    16.         list.add(3);
    17.         list.add(2);
    18.  
    19.         request.setAttribute("myList", list);
    20.         return "test";
    21.     }
    22. }

    4. #numbers

    1. html>
    3. <html lang="en" xmlns:th="http://www.thymeleaf.org">
    4. <head>
    5.     <meta charset="UTF-8">
    6.     <title>Titletitle>
    7. head>
    8. <body>
    9.     #dates日期对象 <br/>
    10.     <p th:text="${#numbers.formatCurrency(myNumber)}">p>       
    11.     <p th:text="${#numbers.formatDecimal(myNumber, 4, 1)}">p>  
    12. body>
    13. html>
    1. package com.xdu.studyspringboot.controller;
    2.  
    3. import org.springframework.stereotype.Controller;
    4. import org.springframework.web.bind.annotation.RequestMapping;
    5.  
    6. import javax.servlet.http.HttpServletRequest;
    7.  
    8. @Controller
    9. public class ThymeleafController {
    10.     @RequestMapping("/utilObject")
    11.     public String testUtilObject(HttpServletRequest request){
    12.        request.setAttribute("myNumber", 12.25);
    13.         return "test";
    14.     }
    15. }

    5. 处理空值

    通过加问号来判断前面的值是否为空，防止报错 

    1. html>
    3. <html lang="en" xmlns:th="http://www.thymeleaf.org">
    4. <head>
    5.     <meta charset="UTF-8">
    6.     <title>Titletitle>
    7. head>
    8. <body>
    9.     <p th:text="${data?.name}">p>           
    10. body>
    11. html>
    1. package com.xdu.studyspringboot.controller;
    2.  
    3. import com.xdu.studyspringboot.pojo.User;
    4. import org.springframework.stereotype.Controller;
    5. import org.springframework.web.bind.annotation.RequestMapping;
    6.  
    7. import javax.servlet.http.HttpServletRequest;
    8. @Controller
    9. public class ThymeleafController {
    10.     @RequestMapping("/utilObject")
    11.     public String testUtilObject(HttpServletRequest request){
    12.         request.setAttribute("data", new User(1, "Tom", 22));
    13.         return "test";
    14.     }
    15. }
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  • 原文地址：https://blog.csdn.net/Archer__13/article/details/126910047