public class MainActivity extends AppCompatActivity implements View.OnClickListener {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(layout.activity_main);

Button button = (Button)findViewById(id.hellobtn);
button.setOnClickListener(this);

}
@Override
public void onClick(View v) {
Toast.makeText(this, "EventTest Click", Toast.LENGTH_LONG).show();

}
}

변수 이름 : JAVA_HOME

변수값  : JDK설치된 경로

</form>

<form action="./partUplaodPro1" method="post" enctype="multipart/form-data">

<label for ="writer">작성자</label>

<input type=text name="writer" id="writer"><br>

<label for ="partFile1">업로드 파일</label>

<input type="file" name="partFile1" id="partFile1">

<input type="submit" value="업로드">

import java.awt.Graphics2D;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.IOException;

import java.util.UUID;

import javax.imageio.ImageIO;

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;

@WebServlet("/partUplaodPro1")

@MultipartConfig(

            fileSizeThreshold=0 ,

            location = "d:/upload"

            )

public class partUploadPro1 extends HttpServlet {

      protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

            request.setCharacterEncoding("utf-8");

            String writer = request.getParameter("writer");

            System.out.println(writer);

            Part part = request.getPart("partFile1");

            String contentDisposition = part.getHeader("content-disposition");

            String contentType = part.getHeader("content-type");

            System.out.println(part);

            if(contentType.equals("image/gif")

                  || contentType.equals("image/jpeg")

                  || contentType.equals("image/png")){

            System.out.println(contentDisposition);

            int dotPosition = contentDisposition.lastIndexOf(".");

            String temp = contentDisposition.substring(dotPosition,contentDisposition.length()-1);

            UUID uuid = UUID.randomUUID();

            String fileName = uuid.toString()+temp;

            part.write(fileName);

            File srcFile = new File("d:\\upload\\"+fileName);

            File destFile = new File("d:\\upload\\_"+fileName);

            BufferedImage srcbi = ImageIO.read(srcFile);

            BufferedImage destbi = new BufferedImage(50, 50, BufferedImage.TYPE_3BYTE_BGR);

            Graphics2D g = destbi.createGraphics();

            g.drawImage(srcbi, 0, 0, 50, 50, null);

            ImageIO.write(destbi, temp.substring(1), destFile);

            }

            else{

                  response.sendRedirect("./partUploadForm1.jsp");

            }

      }

}

import java.io.FileInputStream;

import java.io.IOException;

import java.sql.*;

import java.util.Properties;

public class MemberDao {

      private String url;

      private String dbid;

      private String dbpw;

      private void dbPropertiesInit() throws IOException{

            FileInputStream fin = new FileInputStream("d:\\db.properties");

            Properties pro = new Properties();

            pro.load(fin);

            this.url=pro.getProperty("url");

            this.dbid=pro.getProperty("dbid");

            this.dbpw=pro.getProperty("dbpw");

      }

      public Member selectMemberById(String id) throws ClassNotFoundException, SQLException, IOException{

            //properties 에서 db정보 가져옴(내부적으로 input)

            this.dbPropertiesInit();

            System.out.println(this.dbid+"<=id");

            System.out.println(this.dbpw+"<=pw");

            Class.forName("oracle.jdbc.OracleDriver");

            Connection conn = DriverManager.getConnection(this.url,this.dbid,this.dbpw);

            String query ="select * from oracle_member where ora_id = ?";

            PreparedStatement stmt = conn.prepareStatement(query);

            stmt.setString(1, id);

            ResultSet rs = stmt.executeQuery();

            Member mem=null;

            if(rs.next()){

                  mem = new Member();

                  mem.setId(rs.getString("ora_id"));

                  mem.setPw(rs.getString("ora_pw"));

                  mem.setLevel(rs.getString("ora_level"));

                  mem.setName(rs.getString("ora_name"));

                  mem.setEmail(rs.getString("ora_email"));

            }

            return mem;

      }

      public static void main(String[] args) throws ClassNotFoundException, SQLException, IOException{

            MemberDao mdao = new MemberDao();

            Member m = mdao.selectMemberById("id001");

            System.out.println(m.getId());

      }

}