Question

我有一个JSP问题（我使用Tomcat），我想在浏览器窗口中将标题设置为我的Config类中的字符串，您可以在下面看到，问题是我收到错误。我已经在互联网上搜索过这个问题，但对我来说没什么用。

索引文件：

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page import="test.*" %>
<%
  Config cfg = new Config();
%>
<html>
  <head>
    <title><%= cfg.getSiteTitle() %></title>
  </head>
  <body>
  $END$
  </body>
</html>

配置类：包装测试;

public class Config {
    private String siteTitle = "Test";

    public String getSiteTitle() {
        return siteTitle;
    }

    public void setSiteTitle(String siteTitle) {
        this.siteTitle = siteTitle;
    }
}

Tomcat错误日志：

15-May-2016 12:35:52.483 SEVERE [http-nio-8080-exec-10]
org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service()
for servlet [jsp] in context with path [] threw exception [Unable to compile class for JSP: 

An error occurred at line: 4 in the jsp file: /CMS/web/index.jsp
Config cannot be resolved to a type
1: <%@ page contentType="text/html;charset=UTF-8" language="java" %>
2: <%@ page import="test.*" %>
3: <%
4:   Config cfg = new Config();
5: %>
6: <html>
7:   <head>


An error occurred at line: 4 in the jsp file: /CMS/web/index.jsp
Config cannot be resolved to a type
1: <%@ page contentType="text/html;charset=UTF-8" language="java" %>
2: <%@ page import="test.*" %>
3: <%
4:   Config cfg = new Config();
5: %>
6: <html>
7:   <head>


Stacktrace:] with root cause
 org.apache.jasper.JasperException: Unable to compile class for JSP: 

An error occurred at line: 4 in the jsp file: /CMS/web/index.jsp
Config cannot be resolved to a type
1: <%@ page contentType="text/html;charset=UTF-8" language="java" %>
2: <%@ page import="test.*" %>
3: <%
4:   Config cfg = new Config();
5: %>
6: <html>
7:   <head>


An error occurred at line: 4 in the jsp file: /CMS/web/index.jsp
Config cannot be resolved to a type
1: <%@ page contentType="text/html;charset=UTF-8" language="java" %>
2: <%@ page import="test.*" %>
3: <%
4:   Config cfg = new Config();
5: %>
6: <html>
7:   <head>


Stacktrace:
at org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:102)
at org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:198)
at org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:450)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:361)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:336)
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:323)
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:585)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:363)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:673)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1526)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1482)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java    :61)
    at java.lang.Thread.run(Thread.java:745)

我希望我能给你足够的信息，提前谢谢你！

Answer 1

解决方案

您的配置类无法解析为类型。这意味着 Config 类要么不在您的运行时类路径中，要么不在您的jsp中导入。

我注意到你导入了测试。*
如果 Config 类不直接在包测试下，则jsp将无法识别它。

在您导入测试的同一位置明确导入配置类。*应解决您的问题，如下所示：
<%@ page import="test.whatever.Config" %>

建议

请，请不要在你的jsp中包含java代码。使用jsp作为视图，EL，servlet作为控制器。您将在Servlet中创建Config实例，然后将实例保存在请求/会话范围中，然后您可以使用EL访问jsp中的配置。搜索“MVC jsp servlet”将为您提供有关如何操作的大量信息。

无法为JSP编译类：服务器遇到内部错误，导致无法完成此请求

1 个答案:

解决方案

建议