jstl

springboot整合jsp

ぐ巨炮叔叔 提交于 2021-02-14 09:21:05
1.新建Maven工程 2.pom关键依耐 <? xml version="1.0" encoding="UTF-8" ?> < project xmlns ="http://maven.apache.org/POM/4.0.0" xmlns:xsi ="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation ="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" > < modelVersion > 4.0.0 </ modelVersion > < parent > < groupId > org.springframework.boot </ groupId > < artifactId > spring-boot-starter-parent </ artifactId > < version > 1.5.10.RELEASE </ version > </ parent > < groupId > com.cchengyyj </ groupId > < artifactId > springboot-jsp </ artifactId > < version > 0.0.1-SNAPSHOT </

MyBatis动态SQL语句

断了今生、忘了曾经 提交于 2021-02-12 11:04:02
MyBatis 的强大特性之一便是它的动态 SQL。如果你有使用 JDBC 或其他类似框架的经验,你就能体会到根据不同条件拼接 SQL 语句有多么痛苦。拼接的时候要确保不能忘了必要的空格,还要注意省掉列名列表最后的逗号。利用动态 SQL 这一特性可以彻底摆脱这种痛苦。 通常使用动态 SQL 不可能是独立的一部分,MyBatis 当然使用一种强大的动态 SQL 语言来改进这种情形,这种语言可以被用在任意的 SQL 映射语句中。 动态 SQL 元素和使用 JSTL 或其他类似基于 XML 的文本处理器相似。在 MyBatis 之前的版本中,有很多的元素需要来了解。MyBatis 3 大大提升了它们,现在用不到原先一半的元素就可以了。MyBatis 采用功能强大的基于 OGNL 的表达式来消除其他元素。 mybatis 的动态sql语句是基于OGNL表达式的。可以方便的在 sql 语句中实现某些逻辑. 总体说来mybatis 动态SQL 语句主要有以下几类: 1. if 语句 (简单的条件判断) 2. choose (when,otherwize) ,相当于java 语言中的 switch ,与 jstl 中的choose 很类似. 3. trim (对包含的内容加上 prefix,或者 suffix 等,前缀,后缀) 4. where (主要是用来简化sql语句中where条件判断的

JSTL 1.2 The absolute uri: http://java.sun.com/jsp/jstl/core cannot be resolved

喜你入骨 提交于 2021-02-11 14:28:46
问题 I am getting this error *org.apache.jasper.JasperException: The absolute uri: http://java.sun.com/jsp/jstl/core cannot be resolved in either web.xml or the jar files deployed with this applicationj I do have the javax.servlet.jsp.jstl-1.2.1.jar and the javax.servlet.jsp.jstl-api-1.2.1.jar in the WEB-INF/lib folder . Below is the taglib import in JSP . taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" taglib uri="http://java.sun.com/jsp/jstl/sql" prefix="sql" 来源: https://stackoverflow

HTTP Status 500

我只是一个虾纸丫 提交于 2021-02-11 09:40:35
HTTP Status 500 - The absolute uri: http://java.sun.com/jsp/jstl/core cannot-报错解决方法 参考文章: (1)HTTP Status 500 - The absolute uri: http://java.sun.com/jsp/jstl/core cannot-报错解决方法 (2)https://www.cnblogs.com/chuijingjing/p/9703837.html 备忘一下。 来源: oschina 链接: https://my.oschina.net/u/3797416/blog/4952291

Hash Map key check in JSTL

两盒软妹~` 提交于 2021-02-07 14:22:22
问题 Need help.I have a hash map which is returned from a spring controller to JSP.Is there a way just to check if a certain key exists irrespective of any value(the value may be null too) Say, the below hash map is being sent from the controller HashMap hmap = new HashMap(); hmap.put("COUNTRY", "X"); hmap.put("REGION", null); If the key REGION exists ( value may be anything including null) then display some section in the jsp. I am trying to access the key as ${hmap['REGION']} Thanks in advance.

Hash Map key check in JSTL

你说的曾经没有我的故事 提交于 2021-02-07 14:21:43
问题 Need help.I have a hash map which is returned from a spring controller to JSP.Is there a way just to check if a certain key exists irrespective of any value(the value may be null too) Say, the below hash map is being sent from the controller HashMap hmap = new HashMap(); hmap.put("COUNTRY", "X"); hmap.put("REGION", null); If the key REGION exists ( value may be anything including null) then display some section in the jsp. I am trying to access the key as ${hmap['REGION']} Thanks in advance.

JSTL 1.0 String Functions

筅森魡賤 提交于 2021-02-05 07:54:14
问题 I am trying to use some string functions like trim or concat using JSTL. I tried the following. I tried adding <%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %> but I ended up with the error. I think this is for other JSTL version like 1.2 or 1.1 All I would need to know is how to use string function in JSTL 1.0 回答1: JSTL 1.0 does not have the /jsp part in the taglib URI. Remove that part. <%@ taglib prefix="fn" uri="http://java.sun.com/jstl/functions" %> See also: Our

value from resource bundle as pattern in formatDate

随声附和 提交于 2021-02-04 19:00:31
问题 I want to read pattern for JST formatDate also from resource bundle but this naive approach does not working, what I'm doing wrong ? in com/company/MyPortlet.properties is this key: company.date.format = yyyy-MM-dd HH:mm:ss In page I have: <fmt:setBundle basename="com.company.MyPortlet"/> <fmt:formatDate value="${date}" pattern="${company.date.format}" /> 回答1: You need to give the bundle a variable name. <fmt:setBundle basename="com.company.MyPortlet" var="bundle" /> This way bundle is

Reloading JSTL Tag files in Tomcat development mode

天大地大妈咪最大 提交于 2021-01-29 14:19:45
问题 The application I just inherited defines .tag files - ie JSTL tags written in JSP and other JSTL tags. Is it possible for Tomcat to pick up on changes to .tag files and recompile/reload them without a restart, in the same manner of "development" mode for JSPs? Edit I should have noted that the context is marked as "reloadable" in Tomcat, and I'm successfully hot-deploying class files and jsps. It's just not picking up on .tag files. 回答1: "development" mode for JSPs applies for the tag files

how does jsp:useBean scope attribute work?

放肆的年华 提交于 2021-01-29 03:28:46
问题 I am trying to understand how exactly scope attribute in jsp:useBean JSP action tag works. In my understanding scope is used to indicate where the bean is located (request,session,application etc.), but after some testing I came across an interesting situation where it's not the case, please consider the following JSP code (I am using scriplets here just for the sake of simplicity): <%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1" import=