alexandreaquiles/UploadArquivoServlet.java

## formUpload.html
<html>
	<body>
		<form action="upload" method="post" enctype="multipart/form-data">
			<input type="text" name="texto">
			<input type="file" name="arquivo">
			<input type="submit" value="Upload">
		</form>
	</body>
</html>

## libs.txt
Baixar os seguintes arquivos e colocar em WEB-INF\lib\

http://repo1.maven.org/maven2/commons-fileupload/commons-fileupload/1.3/commons-fileupload-1.3.jar
http://repo1.maven.org/maven2/commons-io/commons-io/2.2/commons-io-2.2.jar

## UploadArquivoServlet.java
package upload;

import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Iterator;
import java.util.List;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class UploadArquivoServlet extends HttpServlet {

	private File diretorio;

	@Override
	public void init(ServletConfig config) throws ServletException {
                super.init(config);
		String path = config.getInitParameter("diretorio");
		diretorio = new File(path);
		diretorio.mkdirs();
	}

	@Override
	protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		PrintWriter out = response.getWriter();

		boolean isMultipart = ServletFileUpload.isMultipartContent(request);
		if (!isMultipart) {
			out.println("<h1>Voce não enviou um arquivo!</h1>");
			return;
		}

		for (String elemento : request.getParameterMap().keySet()) {
			System.out.println(elemento);
		}

		DiskFileItemFactory factory = new DiskFileItemFactory();
		factory.setRepository(diretorio);

		ServletFileUpload upload = new ServletFileUpload(factory);

		try {
			List<FileItem> items = upload.parseRequest(request);
			for (FileItem item : items ) {
			    if (!item.isFormField()) {
			        processUploadedFile(item);
			    } else {
			    	//para inputs que nao sao 'file', isFormField() é verdadeiro
			    	String nomeDoCampo = item.getFieldName();
				String valorDoCampo = item.getString();
				System.out.println(nomeDoCampo + ": " + valorDoCampo);
			    }
			}

			out.println("<h1>Arquivo gravado!</h1>");

		} catch (Exception e) {
			out.println("<h1>Erro ao escrever no arquivo!</h1>");
			return;
		}


	}

	private void processUploadedFile(FileItem item) throws Exception {
		String fileName = item.getName();
		File uploadedFile = new File(diretorio, fileName);
	    item.write(uploadedFile);
	}

}

## web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <servlet>
  	<servlet-name>upload</servlet-name>
  	<servlet-class>upload.UploadArquivoServlet</servlet-class>
  	<init-param>
  		<param-name>diretorio</param-name>
  		<param-value>D:/Alexandre_Silva/uploads</param-value>
  	</init-param>
  </servlet>
  <servlet-mapping>
  	<servlet-name>upload</servlet-name>
  	<url-pattern>/upload</url-pattern>
  </servlet-mapping>
</web-app>
	<html>
	<body>
	<form action="upload" method="post" enctype="multipart/form-data">
	<input type="text" name="texto">
	<input type="file" name="arquivo">
	<input type="submit" value="Upload">
	</form>
	</body>
	</html>
	Baixar os seguintes arquivos e colocar em WEB-INF\lib\

	http://repo1.maven.org/maven2/commons-fileupload/commons-fileupload/1.3/commons-fileupload-1.3.jar
	http://repo1.maven.org/maven2/commons-io/commons-io/2.2/commons-io-2.2.jar
	package upload;

	import java.io.File;
	import java.io.IOException;
	import java.io.PrintWriter;
	import java.util.Iterator;
	import java.util.List;

	import javax.servlet.ServletConfig;
	import javax.servlet.ServletException;
	import javax.servlet.http.HttpServlet;
	import javax.servlet.http.HttpServletRequest;
	import javax.servlet.http.HttpServletResponse;

	import org.apache.commons.fileupload.FileItem;
	import org.apache.commons.fileupload.disk.DiskFileItemFactory;
	import org.apache.commons.fileupload.servlet.ServletFileUpload;

	public class UploadArquivoServlet extends HttpServlet {

	private File diretorio;

	@Override
	public void init(ServletConfig config) throws ServletException {
	super.init(config);
	String path = config.getInitParameter("diretorio");
	diretorio = new File(path);
	diretorio.mkdirs();
	}

	@Override
	protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	PrintWriter out = response.getWriter();

	boolean isMultipart = ServletFileUpload.isMultipartContent(request);
	if (!isMultipart) {
	out.println("<h1>Voce não enviou um arquivo!</h1>");
	return;
	}

	for (String elemento : request.getParameterMap().keySet()) {
	System.out.println(elemento);
	}

	DiskFileItemFactory factory = new DiskFileItemFactory();
	factory.setRepository(diretorio);

	ServletFileUpload upload = new ServletFileUpload(factory);

	try {
	List<FileItem> items = upload.parseRequest(request);
	for (FileItem item : items ) {
	if (!item.isFormField()) {
	processUploadedFile(item);
	} else {
	//para inputs que nao sao 'file', isFormField() é verdadeiro
	String nomeDoCampo = item.getFieldName();
	String valorDoCampo = item.getString();
	System.out.println(nomeDoCampo + ": " + valorDoCampo);
	}
	}

	out.println("<h1>Arquivo gravado!</h1>");

	} catch (Exception e) {
	out.println("<h1>Erro ao escrever no arquivo!</h1>");
	return;
	}


	}

	private void processUploadedFile(FileItem item) throws Exception {
	String fileName = item.getName();
	File uploadedFile = new File(diretorio, fileName);
	item.write(uploadedFile);
	}

	}
	<?xml version="1.0" encoding="UTF-8"?>
	<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
	<servlet>
	<servlet-name>upload</servlet-name>
	<servlet-class>upload.UploadArquivoServlet</servlet-class>
	<init-param>
	<param-name>diretorio</param-name>
	<param-value>D:/Alexandre_Silva/uploads</param-value>
	</init-param>
	</servlet>
	<servlet-mapping>
	<servlet-name>upload</servlet-name>
	<url-pattern>/upload</url-pattern>
	</servlet-mapping>
	</web-app>