Ref:
https://www.codejava.net/java-ee/servlet/java-file-upload-example-with-servlet-30-api

https://www.baeldung.com/upload-file-servlet

Servlet 3 File Upload – @MultipartConfig, Part

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;

/**
 * Servlet implementation class MultiPartServlet
 */
@WebServlet("/multiPartServlet")
@MultipartConfig(fileSizeThreshold=1024*1024*10, 	// 10 MB 
maxFileSize=1024*1024*50,      	// 50 MB
maxRequestSize=1024*1024*100)   	// 100 MB
public class MultiPartServlet extends HttpServlet {
  private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public MultiPartServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

  /**
   * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
   */
  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // TODO Auto-generated method stub
    response.getWriter().append("Served at: ").append(request.getContextPath());
    
    PrintWriter out = response.getWriter();
  }

  private static final String SAVE_DIR = "uploadFiles";
  
  /**
   * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
   */
  protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    // gets absolute path of the web application
        String appPath = request.getServletContext().getRealPath("");
        // constructs path of the directory to save uploaded file
        String savePath = appPath + File.separator + SAVE_DIR;
         
        // creates the save directory if it does not exists
        File fileSaveDir = new File(savePath);
        if (!fileSaveDir.exists()) {
            fileSaveDir.mkdir();
        }
    
    
    for (Part part : request.getParts()) {
        String fileName = extractFileName(part);
//		    part.write(fileName);
        response.getWriter().println("/home/shailesh/eclipse-workspace/TestProject/WebContent/images/" + fileName);
        part.write("/home/shailesh/eclipse-workspace/TestProject/WebContent/images/" + fileName);
    }
    response.getWriter().println("Uploaded...");
    doGet(request, response);
  }
  
  private String extractFileName(Part part) {
      String contentDisp = part.getHeader("content-disposition");
      String[] items = contentDisp.split(";");
      for (String s : items) {
          if (s.trim().startsWith("filename")) {
              return s.substring(s.indexOf("=") + 2, s.length()-1);
          }
      }
      return "";
  }

}

 

<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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>TestProject</groupId>
  <artifactId>TestProject</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  <build>
    <sourceDirectory>src</sourceDirectory>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.8.0</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
      <plugin>
        <artifactId>maven-war-plugin</artifactId>
        <version>3.2.3</version>
        <configuration>
          <warSourceDirectory>WebContent</warSourceDirectory>
        </configuration>
      </plugin>
    </plugins>
  </build>
  <dependencies>
  	<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
  <dependency>
    	<groupId>org.springframework</groupId>
   	 	<artifactId>spring-webmvc</artifactId>
    	<version>5.2.1.RELEASE</version>
  </dependency>
  
  <!-- Apache Commons FileUpload -->
    <dependency>
        <groupId>commons-fileupload</groupId>
        <artifactId>commons-fileupload</artifactId>
        <version>1.3.2</version>
    </dependency>

    <!-- Apache Commons IO -->
    <dependency>
        <groupId>commons-io</groupId>
        <artifactId>commons-io</artifactId>
        <version>2.5</version>
    </dependency>
  
  </dependencies>
</project>

<form method="post" action="multiPartServlet" enctype="multipart/form-data">
  Choose a file: <input type="file" name="multiPartServlet" />
    <input type="submit" value="Upload" />
</form>

 

Spring 5 MVC + Hibernate 5 Example

 

https://www.boraji.com/spring-mvc-5-static-resources-handling-example

 

 

Classes and Objects
1. Create class Rectangle
a) data members
– length
– breadth
b) methods
– setDimensions
– area
– perimeter

2. Create class Cube
a) data members
– length
– breadth
– height
b) methods
– setDimensions
– volume

3. Create class Worker
a) data members
– wages
– wdays
b) methods
– setData
– payment

Method Overloading

1. Create class Box
a) data members
– length
– breadth
– height
b) methods
– setDimensions(3 args)
– setDimensions(1 arg)
– volume

Method Returning Value
1. WAP to find total payment of two employeesCreate
Create class Worker
a) data members
– wages
– wdays
b) methods
– setData
– int payment

Constructors
1. Create class Circle and initialize radius using a default constructor
2. Create class Circle and initialize radius using parameterized constructor
3. Create class Circle and define two constructor default and parameterized (Constructor overloading)

Static data members and member functions
1. Create a class Circle and find its area
a) data members
– int radius
– static double pi
b) methods
– area

2. Create a class Bank Account and find interest
a) data members
– int account_number
– int balance
– static double interest_rate
b) methods
– interest (balance * interest_rate * no_of_period / 100.0)
– changeRate (change interest_rate)