如何在Java开发用的Eclipse（含Photon版）中开发JSP网站？

Hey there! Since you're already using Eclipse Photon for pure Java work, adding JSP support is straightforward—no need to switch to a different IDE. Let's walk through the steps to get you set up:

Step 1: Install the Eclipse Web Tools Platform (WTP) Plugin #

Your pure Java Eclipse Photon doesn't include web development tools out of the box, so we'll install the WTP plugin first:

• Open Eclipse, go to Help > Install New Software.
• In the "Work with" dropdown, select the Photon official update site (it’ll look like Photon - https://download.eclipse.org/releases/photon; if it’s not listed, paste that URL directly).
• Expand the Web, XML, Java EE and OSGi Enterprise Development category.
• Check these core components (you can pick more if you need extra features, but these are the essentials for JSP):
  • Eclipse Java EE Developer Tools
  • Eclipse Web Developer Tools
  • JSP Development Tools
• Click Next, review the installation details, accept the license agreements, and proceed.
• Restart Eclipse when prompted—this is crucial for the changes to take effect.

Step 2: Create a Dynamic Web Project #

With the web tools installed, create a project tailored for JSP development:

• Go to File > New > Project, search for and select Dynamic Web Project.
• Enter a project name, then click Next.
• On the next screen, you’ll need a Target Runtime (your web server, like Apache Tomcat). If you haven’t set one up yet, click New Runtime (we’ll cover that in Step 3).
• Keep most default settings, but if you need a traditional web.xml deployment descriptor, make sure to check that box before clicking Finish.

Step 3: Configure a Web Server (e.g., Apache Tomcat) #

To run your JSP project, you need a web server configured in Eclipse:

• Go to Window > Show View > Servers (if the Servers view is missing, switch to the Java EE perspective via Window > Perspective > Open Perspective > Other > Java EE).
• Click the link that says No servers are available. Click this link to create a new server....
• Select Apache > Tomcat v8.5 Server (or v9.0, which works perfectly with Eclipse Photon) and click Next.
• Browse to your local Tomcat installation directory, then click Finish.
• Add your project to the server: Right-click the server in the Servers view > Add and Remove..., select your Dynamic Web Project, and click Finish.

Step 4: Create and Edit JSP Files #

Now you’re ready to write JSP code:

• In your project, navigate to the WebContent folder (this is the root of your web app).
• Right-click WebContent > New > JSP File.
• Enter a filename (e.g., index.jsp) and click Finish.
• You can now mix HTML markup with Java code using JSP syntax. Here’s a quick example to get started:

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>My First JSP</title>
</head>
<body>
    <h1>Hello from JSP!</h1>
    <% String dynamicMessage = "This comes from embedded Java code"; %>
    <p><%= dynamicMessage %></p>
</body>
</html>

Step 5: Run Your JSP Project #

Test your application with these steps:

• Right-click your Dynamic Web Project > Run As > Run on Server.
• Select your configured Tomcat server and click Finish.
• Eclipse will start the server and open a browser window pointing to your app (usually at http://localhost:8080/YourProjectName/index.jsp).

Quick Tips #

• Stick to Tomcat 8.5 or 9.0 for the best compatibility with Eclipse Photon.
• If plugin installation fails, double-check your internet connection and ensure you’re using the correct Photon update site.
• The Java EE perspective organizes views like Servers and Project Explorer to make web development smoother.

内容的提问来源于stack exchange，提问作者Joel J Sebastian