test

Test.java

@@ -1,10 +0,0 @@
-import java.io.*;
-
-public class Test {
-    public static void main(String[] args) throws Exception {
-        Writer writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("/home/test.txt")));
-        writer.write("hello world!!");
-        writer.flush();
-        writer.close();
-    }
-}

pom.xml

@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.example</groupId>
+    <artifactId>demo</artifactId>
+    <version>1</version>
+    <name>demo</name>
+    <packaging>war</packaging>
+
+    <properties>
+        <maven.compiler.target>1.8</maven.compiler.target>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <junit.version>5.6.2</junit.version>
+    </properties>
+
+    <dependencies>
+        <dependency>
+            <groupId>javax.servlet</groupId>
+            <artifactId>javax.servlet-api</artifactId>
+            <version>4.0.1</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+            <version>${junit.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-engine</artifactId>
+            <version>${junit.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-war-plugin</artifactId>
+                <version>3.3.0</version>
+            </plugin>
+        </plugins>
+    </build>
+</project>

src/main/java/controller/HelloWorld.java

@@ -0,0 +1,35 @@
+package controller;
+
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.io.PrintWriter;
+
+public class HelloWorld  extends HttpServlet {
+
+    private String message;
+
+    @Override
+    public void init() throws ServletException {
+        message = "Hello world, this message is from servlet!";
+    }
+
+    @Override
+    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
+        //设置响应内容类型
+        resp.setContentType("text/html");
+
+        //设置逻辑实现
+        PrintWriter out = resp.getWriter();
+        out.println("<h1>" + message + "</h1>");
+    }
+
+    @Override
+    public void destroy() {
+        super.destroy();
+    }
+
+}

src/main/webapp/WEB-INF/web.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
+         version="4.0">
+
+    <servlet>
+        <servlet-name>HelloWorld</servlet-name>
+        <servlet-class>controller.HelloWorld</servlet-class>
+    </servlet>
+    <servlet-mapping>
+        <servlet-name>HelloWorld</servlet-name>
+        <url-pattern>/hello</url-pattern>
+    </servlet-mapping>
+</web-app>