fangj/FileUploadServlet.java

## FileUploadServlet.java
@WebServlet("/upload")
@MultipartConfig(location = "/tmp")
public class FileUploadServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
        getServletContext().getRequestDispatcher("/WEB-INF/views/fileUpload.jsp").forward(req, res);
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
        Collection<Part> parts = req.getParts();
        for(Part part : parts) {
            System.out.println("Name:");
            System.out.println(part.getName());
            System.out.println("Header: ");
            for(String headerName : part.getHeaderNames()) {
                System.out.println(headerName);
                System.out.println(part.getHeader(headerName));
            }
            System.out.println("Size: ");
            System.out.println(part.getSize());
            part.write(part.getName() + "-down");
        }
        res.sendRedirect("/upload");
    }
}

## spring-common-fileupload-servlet.xml
<bean id="multipartResolver"
    class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

    <!-- one of the properties available; the maximum file size in bytes -->
    <property name="maxUploadSize" value="100000"/>
</bean>

## spring-servlet.xml
    <bean id="multipartResolver" class="org.springframework.web.multipart.support.StandardServletMultipartResolver">
    </bean>

## SpringFileUploadController.java
@Controller
public class SpringFileUploadController{

    @RequestMapping(value = "/s/upload", method = RequestMethod.GET)
    public String fileUploadForm(){
        return "/supload";
    }

    @RequestMapping(value = "/s/upload", method = RequestMethod.POST)
    public String fileUploadSubmit(@RequestParam("file") Part part){
        System.out.println(part.getName());
        System.out.println(part.getHeader("content-disposition"));
        System.out.println(part.getContentType());
        System.out.println(part.getSize());
        try {
            part.write("sample");
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        return "redirect:/s/upload";
    }

}

## upload.jsp
<!doctype html>
<html>
    <head>
        <meta charset="UTF-8"/>
        <title>File Upload Sample</title>
    </head>
    <body>
        <form action="/upload" enctype="multipart/form-data" method="post">
            <p>
                <label>Select a file: </label>
                <input type="file" name="file"/>
            </p>
            <input type="submit" value="Upload" />
        </form>
    </body>
</html>

## web.xml
    <servlet>
        <servlet-name>spring</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath*:/spring-servlet.xml</param-value>
        </init-param>
        <multipart-config>
            <max-file-size>52428800</max-file-size>
            <max-request-size>52428800</max-request-size>
            <file-size-threshold>0</file-size-threshold>
        </multipart-config>
    </servlet>
	@WebServlet("/upload")
	@MultipartConfig(location = "/tmp")
	public class FileUploadServlet extends HttpServlet {

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
	getServletContext().getRequestDispatcher("/WEB-INF/views/fileUpload.jsp").forward(req, res);
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
	Collection<Part> parts = req.getParts();
	for(Part part : parts) {
	System.out.println("Name:");
	System.out.println(part.getName());
	System.out.println("Header: ");
	for(String headerName : part.getHeaderNames()) {
	System.out.println(headerName);
	System.out.println(part.getHeader(headerName));
	}
	System.out.println("Size: ");
	System.out.println(part.getSize());
	part.write(part.getName() + "-down");
	}
	res.sendRedirect("/upload");
	}
	}
	<bean id="multipartResolver"
	class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

	<!-- one of the properties available; the maximum file size in bytes -->
	<property name="maxUploadSize" value="100000"/>
	</bean>
	<bean id="multipartResolver" class="org.springframework.web.multipart.support.StandardServletMultipartResolver">
	</bean>
	@Controller
	public class SpringFileUploadController{

	@RequestMapping(value = "/s/upload", method = RequestMethod.GET)
	public String fileUploadForm(){
	return "/supload";
	}

	@RequestMapping(value = "/s/upload", method = RequestMethod.POST)
	public String fileUploadSubmit(@RequestParam("file") Part part){
	System.out.println(part.getName());
	System.out.println(part.getHeader("content-disposition"));
	System.out.println(part.getContentType());
	System.out.println(part.getSize());
	try {
	part.write("sample");
	} catch (IOException e) {
	throw new RuntimeException(e);
	}
	return "redirect:/s/upload";
	}

	}
	<!doctype html>
	<html>
	<head>
	<meta charset="UTF-8"/>
	<title>File Upload Sample</title>
	</head>
	<body>
	<form action="/upload" enctype="multipart/form-data" method="post">
	<p>
	<label>Select a file: </label>
	<input type="file" name="file"/>
	</p>
	<input type="submit" value="Upload" />
	</form>
	</body>
	</html>
	<servlet>
	<servlet-name>spring</servlet-name>
	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
	<init-param>
	<param-name>contextConfigLocation</param-name>
	<param-value>classpath*:/spring-servlet.xml</param-value>
	</init-param>
	<multipart-config>
	<max-file-size>52428800</max-file-size>
	<max-request-size>52428800</max-request-size>
	<file-size-threshold>0</file-size-threshold>
	</multipart-config>
	</servlet>