docs(notes): add Spring web app setup guide

Author: lzwjava

_posts/en/2025-01-11-notes-en.md

@@ -7,9 +7,10 @@ generated: false
 translated: false
 ---
 
-These 2132 notes are primarily generated by AI chatbots. I used them to summarize key points and will walk through them to enhance my understanding.
+These 2133 notes are primarily generated by AI chatbots. I used them to summarize key points and will walk through them to enhance my understanding.
 
 * [Core Essentials of LLM Applications](/notes/2025-09-05-core-llm-essentials-en)
+* [Spring Web Application Setup Without Boot](/notes/2025-09-05-spring-webapp-setup-en)
 * [AI Model Context Window Capacities](/notes/2025-09-03-ai-model-context-window-en)
 * [Alphabet Hits $186.66B in H1 2025](/notes/2025-09-03-alphabet-h1-2025-revenue-en)
 * [Building Trust Takes Time and Consistency](/notes/2025-09-03-building-trust-consistency-en)

notes/2025-09-05-spring-webapp-setup-en.md

@@ -0,0 +1,125 @@
+---
+title: Spring Web Application Setup Without Boot
+lang: en
+layout: post
+audio: false
+translated: false
+generated: true
+image: false
+---
+
+Got it. Since you’re using **Java 8** with **Spring 5.2.2** (no Spring Boot here, just core Spring + web), you’ll need to set up a minimal application manually. Below is a simple example showing how to build a web app with one controller.
+
+---
+
+### 1. Add Required Dependencies
+
+You already have `spring-context`, `spring-web`, and `spring-core`. For serving requests, you also need `spring-webmvc`:
+
+```xml
+<dependency>
+    <groupId>org.springframework</groupId>
+    <artifactId>spring-webmvc</artifactId>
+    <version>5.2.2.RELEASE</version>
+</dependency>
+```
+
+---
+
+### 2. Create a Controller
+
+```java
+package com.example.demo;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.*;
+
+@Controller
+public class HelloController {
+
+    @ResponseBody
+    @RequestMapping("/hello")
+    public String hello() {
+        return "Hello, Spring Web!";
+    }
+}
+```
+
+* `@Controller` tells Spring this is a web controller.
+* `@RequestMapping("/hello")` maps to `http://localhost:8080/hello`.
+* `@ResponseBody` makes it return plain text (not a JSP).
+
+---
+
+### 3. Define Spring Configuration
+
+Since we’re not using Spring Boot, we must wire things manually.
+
+```java
+package com.example.demo;
+
+import org.springframework.context.annotation.*;
+import org.springframework.web.servlet.config.annotation.*;
+
+@Configuration
+@EnableWebMvc
+@ComponentScan(basePackages = "com.example.demo")
+public class AppConfig implements WebMvcConfigurer {
+}
+```
+
+This enables Spring MVC and scans your package for controllers.
+
+---
+
+### 4. Set Up `web.xml` (for Tomcat/Servlet container)
+
+If you’re packaging as a WAR:
+
+```xml
+<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
+         version="3.1">
+
+    <servlet>
+        <servlet-name>dispatcher</servlet-name>
+        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
+        <init-param>
+            <param-name>contextClass</param-name>
+            <param-value>org.springframework.web.context.support.AnnotationConfigWebApplicationContext</param-value>
+        </init-param>
+        <init-param>
+            <param-name>contextConfigLocation</param-name>
+            <param-value>com.example.demo.AppConfig</param-value>
+        </init-param>
+        <load-on-startup>1</load-on-startup>
+    </servlet>
+
+    <servlet-mapping>
+        <servlet-name>dispatcher</servlet-name>
+        <url-pattern>/</url-pattern>
+    </servlet-mapping>
+
+</web-app>
+```
+
+This sets up the `DispatcherServlet` and loads your `AppConfig`.
+
+---
+
+### 5. Run the App
+
+* Package as a WAR and deploy to Tomcat (or Jetty).
+* Start Tomcat and visit:
+
+  ```
+  http://localhost:8080/your-app/hello
+  ```
+* You should see:
+
+  ```
+  Hello, Spring Web!
+  ```
+
+---
+
+👉 Question for you: do you want this app to run inside **Tomcat (WAR deployment)**, or would you prefer a **standalone `main()` launcher** (embedded server, like Spring Boot but minimal)? I can show both ways depending on your setup.

original/2025-01-11-notes-en.md

@@ -7,9 +7,10 @@ generated: false
 translated: false
 ---
 
-These 2132 notes are primarily generated by AI chatbots. I used them to summarize key points and will walk through them to enhance my understanding.
+These 2133 notes are primarily generated by AI chatbots. I used them to summarize key points and will walk through them to enhance my understanding.
 
 * [Core Essentials of LLM Applications](/notes/2025-09-05-core-llm-essentials-en)
+* [Spring Web Application Setup Without Boot](/notes/2025-09-05-spring-webapp-setup-en)
 * [AI Model Context Window Capacities](/notes/2025-09-03-ai-model-context-window-en)
 * [Alphabet Hits $186.66B in H1 2025](/notes/2025-09-03-alphabet-h1-2025-revenue-en)
 * [Building Trust Takes Time and Consistency](/notes/2025-09-03-building-trust-consistency-en)