java - Gradle 找到 Servlet 库，但找不到 JSP，即 javax.servlet.jsp.tagext。如何导入？

Question

我正在尝试将我的 Web 应用程序从 Eclipse 迁移到 Gradle。我收到有关 Websockets、自定义标签和 jsp 的错误。希望我从 Gradle 开始，我制作了一个基于 http://codetutr.com/2013/03/23/simple-gradle-web-application/ 的 MWE

build.gradle(我注释掉了第三行，还有另一行是关于 jetty 的，真的是在尝试 MWE，直到我需要 jsp 东西之前它就是这样)

apply plugin: 'java' 
apply plugin: 'war' 
//apply plugin: 'eclipse-wtp' //I want Gradle to be IDE agnostic, if not portable.

repositories {
  mavenCentral()
}

dependencies {
//  providedCompile 'javax.servlet:servlet-api:2.5'
  providedCompile 'javax.servlet:javax.servlet-api:3.1.0'
  runtime 'javax.servlet:jstl:1.2'//.1
}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 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_2_5.xsd">

  <servlet>
<display-name>HelloWorldServlet</display-name>
<servlet-name>HelloWorldServlet</servlet-name>
<servlet-class>com.codetutr.HelloWorldServlet</servlet-class>
  </servlet>

  <servlet-mapping>
<servlet-name>HelloWorldServlet</servlet-name>
<url-pattern>/</url-pattern>
  </servlet-mapping>

</web-app>

HelloWorldServlet

package com.codetutr;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class HelloWorldServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)  
    throws ServletException, IOException {
    resp.getOutputStream().write("Hello World.".getBytes());
}
} 

这就是教程的内容，所以我添加了 MyTagHandler.java

  package com.codetutr;

  import javax.servlet.jsp.tagext.*;
  import javax.servlet.jsp.*;
  import java.io.*;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Map;

  public class MyTagHandler extends SimpleTagSupport {

      private static Map<String, String> tagDB = Collections.synchronizedMap(new HashMap<>());
      private static int iter_cnt = 0;

      public void doTag() throws JspException, IOException {
          tagDB.put(Integer.toString(iter_cnt), "Dumb Tag");
          JspWriter out = getJspContext().getOut();
          out.println("<h2>Progress</h2><table border=\"1\">");
          out.println("<tr><th>Id</th><th>State</th></tr>");
          for (Map.Entry<String, String> entry : tagDB.entrySet()) {
          String value = entry.getValue();
          out.println("<tr><th>"+ entry.getKey() + "</th><td>"
                  + value + "</td></tr>");
          }
          out.println("</table>");
      }
  }

我从 gradle.build 收到以下错误

basic-web/src/main/java/com/codetutor/MyTagHandler.java:3: error: package javax.servlet.jsp.tagext does not exist
import javax.servlet.jsp.tagext.*;

basic-web/src/main/java/com/codetutor/MyTagHandler.java:4: error: package javax.servlet.jsp does not exist
import javax.servlet.jsp.*;

basic-web/src/main/java/com/codetutor/MyTagHandler.java:10: error: cannot find symbol
public class MyTagHandler extends SimpleTagSupport {

对于未正确导入类的错误，依此类推。

Standard way of adding JSLT 1.2.1 in a Maven Project?是我能找到的最接近的 q:a。 如果有必要的话，我过去和将来都会使用 Tomcat (8.5)。

Answer 1

您缺少此依赖项

compile group: 'javax.servlet.jsp', name: 'javax.servlet.jsp', version: '2.0.0'
providedCompile group: 'javax.servlet.jsp', name: 'jsp-api', version: '2.0'

'javax.servlet:javax.servlet-api:3.1.0' -- Servlet API

'javax.servlet:jstl:1.2' --- JSTL

需要添加对jsp页面的支持。