jsp{pageContext.request.contextPath}无法获取

已采纳

忘记密码

        <div>
            <input class="ui-dialog-submit"  type="submit" value="登录">
        </div>
          <div align="center"><font color="red">${error}</font></div>
        <div class="ui-dialog-l40">
            <a href="${pageContext.request.contentType}/register.jsp">立即注册</a>
        </div>


    跳出404是因为解析不出el表达式吗？
    web.xml配置
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">

在jsp的指令加上这句话isELIgnored="false"，也是跳404

点赞
写回答
关注问题
收藏
复制链接分享
邀请回答

4条回答

qq_35151346 2年前

j2ee Api文档：
javax.servlet
Interface ServletRequest
getContentType()
Returns the MIME type of the body of the request, or null if the type is not known.
javax.servlet.http
Interface HttpServletRequest
getContextPath()
Returns the portion of the request URI that indicates the context of the request.

首先              
                pageContext.request获取的对象是HttpServletRequest的实现类还是ServletRequest的实现类，这点你没搞懂。其次。看api文档。
                意思是什么。
                 getContentType()返回request的一个mime类型。如果不知道，则为空。
                getContextPath() 返回一个请求的URI。你这里要的肯定是路径吧，不是格式吧。
                ${pageContext.request.contentType}换成${pageContext.request.contextPath}。不知道你xml中配置servlet没。其他的错我不知道，但这一步是错的

点赞 1 评论复制链接分享

采纳
码龄粉丝数

被点赞

被采纳

采纳率

私信
Sometimes_Ymc 2年前
1、第一种、在JSP页面的头部信息添加一个配置 isELIgnored=“false”，即
<%@ page contentType=“text/html;charset=UTF-8” language=“java” isELIgnored=“false”%>
但是这个配置是局部的配置，只在这个JSP页面生效。

2、第二种、因为web.xml文件中的标头版本不对，改为2.4版本及其以上也可以解决问题，这个是全局，即在整个项目都适用。

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"

version="3.0">

还有就是在2.3版本及其以前的版本 isELIgnored=“true” 这个默认的是true，并且，貌似2.5的版本也是为true来

点赞评论复制链接分享
采纳
码龄粉丝数

被点赞

被采纳

采纳率

私信
张音乐 2年前
js 中 window.location.origin

点赞评论复制链接分享

dabocaiqq 2年前

<%=request.getContextPath()%>和${pageContext.request.contextPath}获取的结果都是项目名（上下文），而不是我们想要的那个结果，可是如果我们想要获取项目的绝对路径和端口号我们有什么办法呢

　　

<%
    String path = request.getContextPath();
    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

https://www.cnblogs.com/zhangminghui/p/4122821.html

点赞评论复制链接分享

提交

相关推荐

Debian：如何将错误消息写入文件？ bash
6年前

回答 1 已采纳 I wrote a websocket server with go, running on Debian. Now I have a very long panic message and I want to write it to a file ./server > err writes only the normal output. Error messages still appear on stdout. How can I redirect them?
在Debian上安装php7.1-bcmath php
2年前

回答 1 已采纳 I'm trying to install bcmath for PHP 7.1 on Debian GNU/Linux 9 (stretch) : apt install php7.1-bcmath throw a not found error. Lecture des listes de paquets... Fait Construction de l'arbre des dépendances Lecture des informations d'état... Fait Les paquets suivants ont été installés automatiquement et ne sont plus nécessaires : dh-php libexporter-tiny-perl liblist-moreutils-perl libssl-doc pkg-php-tools shtool xml2 Veuillez utiliser « apt autoremove » pour les supprimer. Les NOUVEAUX paquets suivants seront installés : php7.1-bcmath 0 mis à jour, 1 nouvellement installés, 0 à enlever et 266 non mis à jour. Il est nécessaire de prendre 15,8 ko dans les archives. Après cette opération, 65,5 ko d'espace disque supplémentaires seront utilisés. Err:1 https://packages.sury.org/php stretch/main amd64 php7.1-bcmath amd64 7.1.24-1+0~20181112093455.10+stretch~1.gbp09a4fd 404 Not Found E: Impossible de récupérer https://packages.sury.org/php/pool/main/p/php7.1/php7.1-bcmath_7.1.24-1+0~20181112093455.10+stretch~1.gbp09a4fd_amd64.deb 404 Not Found E: Impossible de récupérer certaines archives, peut-être devrez-vous lancer apt-get update ou essayer avec --fix-missing ? I've already tried an apt-get update --fix-missing with no success. It's seems specific to php7.1 because when I try other versions everything seems fine and ask for confirmation: apt-get install php-bcmath apt-get install php7.0-bcmath
debian codeblocks 不能编译
5年前

回答 1 已采纳我用的是debian8，安装了codeblocks，环境也设置了，![![图片说明](https://img-ask.csdn.net/upload/201611/22/1479816017_755776.png)图片说明](https://img-ask.csdn.net/upload/201611/22/1479816010_732457.png) 这两个都选上了，但是没有结果，我去目录中看了，也没有生成任何文件。
debian在vitural box中的网络配置
4年前

回答 1 已采纳想请教下各位大神。在vitural box 中安装一个debian的虚拟机应该怎么配置网络可以使得虚拟机中的服务能被主机或者同局域网中的其他主机访问。
在Debian上通过pecl安装apcu失败 php
7年前

回答 1 已采纳 On Debian, I have installed php5, php5-dev, php-pear. Then I try to install apcu, but I get this error. Any idea? # pecl install apcu Failed to download pecl/apcu within preferred state "stable", latest release is version 4.0.7, stability "beta", use "channel://pecl.php.net/apcu-4.0.7" to install install failed # pecl install channel://pecl.php.net/apcu-4.0.7 downloading apcu-4.0.7.tgz ... Starting to download apcu-4.0.7.tgz (118,670 bytes) ..........................done: 118,670 bytes 43 source files, building running: phpize Configuring for: PHP Api Version: 20100412 Zend Module Api No: 20100525 Zend Extension Api No: 220100525 Enable full APC compatibility [yes] : yes Enable internal debugging in APCu [no] : building in /tmp/pear/temp/pear-build-root2kAfTA/apcu-4.0.7 running: /tmp/pear/temp/apcu/configure --enable-apc-bc=yes --enable-apcu-debug=no checking for grep that handles long lines and -e... /bin/grep checking for egrep... /bin/grep -E checking for a sed that does not truncate output... /bin/sed checking for cc... cc checking whether the C compiler works... yes checking for C compiler default output file name... a.out checking for suffix of executables... checking whether we are cross compiling... no checking for suffix of object files... o checking whether we are using the GNU C compiler... yes checking whether cc accepts -g... yes checking for cc option to accept ISO C89... none needed checking how to run the C preprocessor... cc -E checking for icc... no checking for suncc... no checking whether cc understands -c and -o together... yes checking for system library directory... lib checking if compiler supports -R... no checking if compiler supports -Wl,-rpath,... yes checking build system type... x86_64-unknown-linux-gnu checking host system type... x86_64-unknown-linux-gnu checking target system type... x86_64-unknown-linux-gnu checking for PHP prefix... /usr checking for PHP includes... -I/usr/include/php5 -I/usr/include/php5/main -I/usr/include/php5/TSRM -I/usr/include/php5/Zend -I/usr/include/php5/ext -I/usr/include/php5/ext/date/lib checking for PHP extension directory... /usr/lib/php5/20100525 checking for PHP installed headers prefix... /usr/include/php5 checking if debug is enabled... no checking if zts is enabled... no checking for re2c... no configure: WARNING: You will need re2c 0.13.4 or later if you want to regenerate PHP parsers. checking for gawk... no checking for nawk... nawk checking if nawk is broken... no checking whether to enable APCu support... yes, shared checking if APCu should provide APC full compatibility support... yes checking if APCu should be allowed to use rwlocks... yes checking if APCu should be built in debug mode... no checking if APCu should clear on SIGUSR1... no checking if APCu will use mmap or shm... mmap checking if APCu should utilize spinlocks before flocks... no configure: WARNING: APCu has access to native rwlocks checking for sigaction... yes checking for union semun... no checking for ANSI C header files... yes checking for sys/types.h... yes checking for sys/stat.h... yes checking for stdlib.h... yes checking for string.h... yes checking for memory.h... yes checking for strings.h... yes checking for inttypes.h... yes checking for stdint.h... yes checking for unistd.h... yes checking valgrind/memcheck.h usability... no checking valgrind/memcheck.h presence... no checking for valgrind/memcheck.h... no checking for shm_open in -lrt... yes checking whether to include code coverage symbols... no checking how to print strings... printf checking for a sed that does not truncate output... (cached) /bin/sed checking for fgrep... /bin/grep -F checking for ld used by cc... /usr/bin/ld checking if the linker (/usr/bin/ld) is GNU ld... yes checking for BSD- or MS-compatible name lister (nm)... /usr/bin/nm -B checking the name lister (/usr/bin/nm -B) interface... BSD nm checking whether ln -s works... yes checking the maximum length of command line arguments... 1572864 checking whether the shell understands some XSI constructs... yes checking whether the shell understands "+="... yes checking how to convert x86_64-unknown-linux-gnu file names to x86_64-unknown-linux-gnu format... func_convert_file_noop checking how to convert x86_64-unknown-linux-gnu file names to toolchain format... func_convert_file_noop checking for /usr/bin/ld option to reload object files... -r checking for objdump... objdump checking how to recognize dependent libraries... pass_all checking for dlltool... no checking how to associate runtime and link libraries... printf %s checking for ar... ar checking for archiver @FILE support... @ checking for strip... strip checking for ranlib... ranlib checking for gawk... (cached) nawk checking command to parse /usr/bin/nm -B output from cc object... ok checking for sysroot... no checking for mt... mt checking if mt is a manifest tool... no checking for dlfcn.h... yes checking for objdir... .libs checking if cc supports -fno-rtti -fno-exceptions... no checking for cc option to produce PIC... -fPIC -DPIC checking if cc PIC flag -fPIC -DPIC works... yes checking if cc static flag -static works... yes checking if cc supports -c -o file.o... yes checking if cc supports -c -o file.o... (cached) yes checking whether the cc linker (/usr/bin/ld -m elf_x86_64) supports shared libraries... yes checking whether -lc should be explicitly linked in... no checking dynamic linker characteristics... GNU/Linux ld.so checking how to hardcode library paths into programs... immediate checking whether stripping libraries is possible... yes checking if libtool supports shared libraries... yes checking whether to build shared libraries... yes checking whether to build static libraries... no configure: creating ./config.status config.status: creating config.h config.status: executing libtool commands running: make sh: 1: make: not found ERROR: `make' failed EDIT: ops, I didn't have "make" installed (which is ridiculous, if pecl needs it it should be a dependency and have been installed automatically while installing the above packages) Anyway, now I get this error: In file included from /tmp/pear/temp/apcu/apc.c:44:0: /usr/include/php5/ext/pcre/php_pcre.h:29:18: fatal error: pcre.h: No such file or directory compilation terminated. make: *** [apc.lo] Error 1 ERROR: `make' failed Looks like another dependency is missing. Shouldn't these package manager be able to install all their dependencies automatically? Is there an easier way out of this than manually installing every single piece that turns out to be missing?
Debian - / usr / bin / env：'php '：没有这样的文件或目录 php docker
3年前

回答 1 已采纳 So go straight to the problem, when I run ./yii seems I got that error from Debian:stretch that I ran from Docker. However when I run /usr/bin/env php -v I got the correct output and there's no problem on it. Seems there's a problem on new line being translated as string and I have no idea how to fix it. Sorry if my English a bit messy and thanks in advance. Just note: I've been trying to edit that file using nano within debian but it's useless. I'm getting the same error. I've check php file within /usr/bin/php and it's exist both php and php7.1 I can run php -v without problem as well
GNURoot Debian如何修改用户？ c++linux
5年前

回答 2 已采纳 ![图片说明](https://img-ask.csdn.net/upload/201603/06/1457278177_239441.png) ![图片说明](https://img-ask.csdn.net/upload/201603/06/1457278189_206115.png) 更换用户需要root权限，但是现在刚装系统没有root权限，请问怎样才能把用户切换为有root权限的用户？
wkhtmltopdf没有为Debian创建pdf php
8年前

回答 2 已采纳 This is my PHP code which I am using to convert HTML file to pdf and then download pdf file from server. wkhtmltopdf $url = base_url().'invoices/'.$file_name.'.html'; exec("wkhtmltopdf-amd64 $url {$file_folder}{$file_name}.pdf"); header("Cache-Control: no-cache"); header("Content-Description: File Transfer"); header("Content-Disposition: attachment; filename=$file_name.pdf"); header("Content-Type: application/pdf"); header("Content-Transfer-Encoding: binary"); $pdfFile = base_url().'invoices/'.$file_name.'.pdf'; readfile($pdfFile); & after execute exec("wkhtmltopdf-amd64 $url {$file_folder}{$file_name}.pdf"); it does not create pdf file in the folder It is working fine on Ubuntu but on Debian after download pdf, when open pdf Adob Reader says error please see the image. I think the issue is due to exec() not working in Debian...! wkhtmltopdf
Debian Php Max文件上传 apache apache php linux
7年前

回答 2 已采纳 First off I'm new to Linux. I've installed Apache, Mysql and PHP on to a raspberry pi(Debian, not raspbian, so all command driven), and i've written a file upload php script, which works for small files, but I can't get it to upload a 85M file, it doesn't come back with any warnings or errors(I have taken the script size limitations out).I have tried changing the max_upload, etc in the /etc/php5/cli/php.ini and /etc/php5/apache2/php.ini and nothing makes a difference, am I missing something or is there a limitation on the pi?The point of this website is to allow large uploads directly onto the company network as have shared the upload directory.Any help would be greatly appreciated
Debian的Packaging Go应用程序
8年前

回答 5 已采纳 How can I put my Go binary into a Debian package? Since Go is statically linked, I just have a single executable--I don't need a lot of complicated project metadata information. Is there a simple way to package the executable and resource files without going through the trauma of debuild? I've looked all over for existing questions; however, all of my research turns up questions/answers about a .deb file containing the golang development environment (i.e., what you would get if you do sudo apt-get install golang-go).
解决Debian系统错误：E: Unable to locate package vim
8月前

江流川的博客错误：E: Unable to locate package vim 平时很少使用Debian，今天使用镜像是基于Debian Linux9的。没有文本编辑命令vim和vi，就想安装个，但是使用apt-get install vim直接给我报了开篇的错误提示。经查，这是因为用的源地址在国外，问题找到了，那解决方向就很明白了，换个我天朝能访问的地址就行了。其实这些都很简单，问题是，网上大量的错误导向，害得我浪费了不少时间。比如 root@1b4671904bfa:/# mv /etc/apt/sourc
Debian：apt和yum的使用方法对比
2年前

qq_36937234的博客 https://blog.csdn.net/mbxc816/article/details/7473906 apt-cache命令功能：搜索某个软件包的名字或显示某个软件包的详细信息功能示例搜索mysql的软件包 $ apt-cache search mysql 查看ssh软件包的详细版本号 $ apt-cache show ssh ...
debian提示 make: command not found
3年前

这个昵称被占用了吗的博客报错：bash: make: command not found 可能原因：make命令可能在系统路径中不存在解决方法：删除并重新安装 sudo apt-get install --reinstall make
debian:A start job is running for Raise network interfaces(ns/5min 3s)
2年前

lingxufire的博客 Debian安装好并配置好无线网络后启动系统是出现A start job is running for Raise network interfaces(ns/5min 3s)，然后得等好长一段时间才能进入登录界面，网上提供了一种方法更改配置文件 /etc/systemd/system/network-online.targets.wants/networking.service 把更改 T...
Debian：从源码安装Apache
7年前

YapingXin的博客先安装一些依赖的库： aptitude install build-essential apt-get install libapr1-dev libaprutil1-dev
Debian/Ubuntu 报错解决：-bash: ifconfig: command not found
2年前

淡竹云开的博客晚上在虚拟机里安装了最新的 Debian 9，然后想查看ip地址的时候报错了： zhang@debian:~$ ifconfig -bash: ifconfig: command not found 出现这个问题的原因是新版本的Debian 默认不带 ifconfig，官方推荐使用ip命令查看ip： zhang@debian:~$ ip addr 1: lo: <LOOPBACK,UP,L...
Debian：SSH登录超时的问题
7年前

YapingXin的博客有一台Debian Linux Server，每次SSH终端登录上去以后
Debian — command not found
2年前

tian_shl的博客问题 sudo: apt-get: command not found 问题描述 # 树莓派需要安装xxx应用 # 由于强制安装xxx包,导致apt相关命令被删除 # 执行apt-get install 或者 apt-get update 等指令均提示: # sudo: apt-get: command not found 解决方式 1. 查看 sources.list root@raspbe...
修改debian9 stretch源
3年前

Krup的博客修改debian9 stretch源修改配置文件
Debian修改系统编码
2年前

小火柴wh的博客查看系统编号格式：locale 修改系统编码：dpkg-reconfigure locales 通过空格键进行删选即可

qq_38081432

jsp{pageContext.request.contextPath}无法获取

4条回答

2、第二种、因为web.xml文件中的标头版本不对，改为2.4版本及其以上也可以解决问题，这个是全局，即在整个项目都适用。

version="3.0">

相关推荐