spring JspException 和 PageContext 无法解析
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JspException and PageContext cannot be resolved
提问by jonnie
This is a follow up to a question on accessing resources in jsp page of spring mvc appThanks to @kmb385 I was able to resolve that problem but now I get the following eclipse errors in my JSP file javax.servlet.jsp.JspException cannot be resolved to a type and
这是一个关于在 spring mvc 应用程序的 jsp 页面中访问资源的问题的后续工作 感谢@kmb385，我能够解决该问题，但现在我的 JSP 文件中出现以下 eclipse 错误 javax.servlet.jsp.JspException cannot be解析为一个类型和
javax.servlet.jsp.PageContext cannot be resolved to a type
javax.servlet.jsp.PageContext 无法解析为类型
as suggest by kmb385, here is my controller:
按照 kmb385 的建议，这是我的控制器：
@Controller
public class AdminController {
@RequestMapping("/")
protected ModelAndView handleRequestInternal(HttpServletRequest request,
HttpServletResponse response) throws Exception {
ModelAndView model = new ModelAndView("index");
model.addObject("msg", "hello world");
return model;
}
}
and here is my index.jsp page just in case:
这是我的 index.jsp 页面以防万一：
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<!-- <link type="text/css" rel="stylesheet" href="css/style.css"/> -->
<style type="text/css">
<%@include file="css/style.css" %>
</style>
<title>My Project - MainPage</title>
</head>
<body>
<h2 class="main_heading2">My Project - MainPage</h2>
<div style="float: right; width: 30%; text-align: center">
<p style="float:left;">an image should be here</p>
<img src="images/logo.jpg" alt="Logo"/>
<img src="${pageContext.servletContext.contextPath}/resources/images/logo.jpg" />
</div>
</body>
I have come across "solutions" to this by disabling it in the JSP validator but Please do not suggest this unless you can give a legitimate reason. I would rather correct this issue properly
我通过在 JSP 验证器中禁用它来解决这个问题，但请不要建议这样做，除非你能给出合理的理由。我宁愿正确纠正这个问题
Any Help appreciated
任何帮助表示赞赏
UPDATE:Build path screen grab as requested by @kmb385
更新：按照@kmb385 的要求构建路径屏幕抓取
回答by Kevin Bowersox
Try setting the servlet-apidependency in your pom.xml to provided. This jar maybe conflicting with the tomcat provided servlet-api.jar.
尝试将servlet-apipom.xml 中的依赖项设置为提供。这个 jar 可能与 tomcat 提供的 servlet-api.jar 冲突。
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency>
Also be sure to include the jsp-api dependency, once again set as provided:
还要确保包含 jsp-api 依赖项，再次设置为提供：
<!-- Servlet -->
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>javax.servlet.jsp-api</artifactId>
<version>2.3.3</version>
<scope>provided</scope>
</dependency>
Make sure all of your maven dependencies are being used to build the project by right clicking your project > Properties. On the deployment assembly tab click the add button, then Java Build Path Entries, then Maven Dependencies and finally Finish.
通过右键单击您的项目 > 属性，确保您的所有 Maven 依赖项都用于构建项目。在部署程序集选项卡上单击添加按钮，然后单击 Java 构建路径条目，然后单击 Maven 依赖项，最后单击完成。
You may also need to add your maven dependencies to the build path. Right click your project > Maven > Update Project Configuration.
您可能还需要将 Maven 依赖项添加到构建路径。右键单击您的项目 > Maven > 更新项目配置。
回答by bpjoshi
If you have downloaded all the dependencies in maven and the error is still not getting away, follow the steps below:
如果您已经下载了 maven 中的所有依赖项并且错误仍然没有消失，请按照以下步骤操作：
- Right click on project and go to properties
- Click over target run time
- Check the box in front of the server you are using.
- 右键单击项目并转到属性
- 单击目标运行时间
- 选中您正在使用的服务器前面的框。
This should work.
这应该有效。
回答by mwangi
Try import the class.
尝试导入类。
Modify your jsp's first line to look like this;
将您的jsp 的第一行修改为如下所示；
<%@ page language="java" import="javax.servlet.jsp.PageContext" contentType="text/html; charset=ISO-8859-1"pageEncoding="ISO-8859-1"%>
<%@ page language="java" import="javax.servlet.jsp.PageContext" contentType="text/html; charset=ISO-8859-1"pageEncoding="ISO-8859-1"%>
回答by mfruizs2
Add to the pom.xml dependencies:
添加到 pom.xml 依赖项：
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.1</version>
<scope>provided</scope>
</dependency>
JSP:
JSP：
Make sure to add on jsp, before tag:
确保在jsp上添加标签之前：
<%@ taglib prefix="fmt" uri="http://java.sun.com/jstl/fmt" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
Get the context on JSP:
获取 JSP 上的上下文：
<c:set var="contextPath" value="${pageContext.request.contextPath}"/>
Import style css:
导入样式 css：
<link type="text/css" rel="stylesheet" href="${contextPath}/css/yourCssFile.css"/>
Dispatcher-servlet:
调度程序servlet：
On your "spring-dispatcher-servlet.xml" add the following lines:
在您的“spring-dispatcher-servlet.xml”上添加以下几行：
<beans xmlns="... xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="...
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
<mvc:resources mapping="/resources/**" location="/resources/css/" />
Maybe, you need to add this adapters:
也许，您需要添加此适配器：
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"/>
<bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/> [Optional]
<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping">
<property name="order" value="0"/>
</bean>
explained here: how to include js and css in jsp with spring MVC
回答by Sachindra N. Pandey
How to solve javax.servlet.jsp.PageContext cannot be resolved to a type
如何解决javax.servlet.jsp.PageContext无法解析为类型
1:- Select your project and Right click
1:- 选择您的项目并右键单击
2:- Go to Properties
2:- 转到属性
3:- Click Targated Runtimes
3:- 单击目标运行时
4:- Check mark "Apache Tomcat v8.0"
4:- 勾选“Apache Tomcat v8.0”
I am using Apache v8.0 in my case
在我的情况下，我使用的是 Apache v8.0
回答by Shashikant Sharma
This will solve the problem
<!-- Need this to compile JSP -->
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<scope>provided</scope>
</dependency>
回答by CLUTCHER
This alternative worked for me <%=request.getContextPath()%>which gets the Application context.
这个替代方案对我<%=request.getContextPath()%>有用，它获取了应用程序上下文。
