这是indexloc提供的服务，不要输入任何密码
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[BAEL-9099] Different Ways to Get Servlet Context #18809

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[BAEL-9099] Different Ways to Get Servlet Context #18809

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52 changes: 52 additions & 0 deletions web-modules/jakarta-servlets-2/src/main/java/com/baeldung/context/ContextServlet.java
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Original file line number Diff line number Diff line change
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package com.baeldung.context;

import jakarta.servlet.ServletConfig;
import jakarta.servlet.ServletContext;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;

import java.io.IOException;

@WebServlet("/context")
public class ContextServlet extends HttpServlet {

@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException {

resp.setContentType("text/plain");

// 1. Direct Access From the Servlet
ServletContext contextFromServlet = this.getServletContext();
resp.getWriter()
.println("1) From HttpServlet: " + contextFromServlet);

resp.getWriter()
.println();

// 2. Accessing Through the ServletConfig
ServletConfig config = this.getServletConfig();
ServletContext contextFromConfig = config.getServletContext();
resp.getWriter()
.println("2) From ServletConfig: " + contextFromConfig);

resp.getWriter()
.println();

// 3. Getting the Context From the HttpServletRequest (Servlet 3.0+)
ServletContext contextFromRequest = req.getServletContext();
resp.getWriter()
.println("3) From HttpServletRequest: " + contextFromRequest);

resp.getWriter()
.println();

// 4. Retrieving Through the Session Object
ServletContext contextFromSession = req.getSession()
.getServletContext();
resp.getWriter()
.println("4) From HttpSession: " + contextFromSession);
}
}