javakrishna: Downloading And Uploading the pdf File from to the WebServer

https://howtodoinjava.com/spring-mvc/spring-mvc-download-file-controller-example/

Other Referenced Sites:

https://howtodoinjava.com/spring-mvc/spring-mvc-multi-file-upload-example/

@Controller

@RequestMapping("/download")

public class FileDownloadController 

{

    @RequestMapping("/pdf/{fileName:.+}")

    public void downloadPDFResource( HttpServletRequest request, 

                                     HttpServletResponse response, 

                                     @PathVariable("fileName") String fileName) 

{

        //If user is not authorized - he should be thrown out from here itself

        //Authorized user will download the file

        String dataDirectory = request.getServletContext().getRealPath("/WEB-INF/downloads/pdf/");

        Path file = Paths.get(dataDirectory, fileName);

        if (Files.exists(file)) 

{

            response.setContentType("application/pdf");

            response.addHeader("Content-Disposition", "attachment; filename="+fileName);

try

{

                Files.copy(file, response.getOutputStream());

                response.getOutputStream().flush();

}

            catch (IOException ex) {

                ex.printStackTrace();

}

}

}

}

http://localhost:8080/springmvcexample/download/pdf/sample.pdf

=======================================================================

@Controller
@RequestMapping("/download")
public class FileDownloadController 
{
    @RequestMapping("/pdf/{fileName:.+}")
    public void downloadPDFResource( HttpServletRequest request, 
                                     HttpServletResponse response, 
                                     @PathVariable("fileName") String fileName,
                                     @RequestHeader String referer) 
    {
        //Check the renderer
        if(referer != null && !referer.isEmpty()) {
            //do nothing
            //or send error
        }
        //If user is not authorized - he should be thrown out from here itself
         
        //Authorized user will download the file
        String dataDirectory = request.getServletContext().getRealPath("/WEB-INF/downloads/pdf/");
        Path file = Paths.get(dataDirectory, fileName);
        if (Files.exists(file)) 
        {
            response.setContentType("application/pdf");
            response.addHeader("Content-Disposition", "attachment; filename="+fileName);
            try
            {
                Files.copy(file, response.getOutputStream());
                response.getOutputStream().flush();
            } 
            catch (IOException ex) {
                ex.printStackTrace();
            }
        }
    }
}



Spring MVC Multiple File Upload Example
*************************************************************************
https://howtodoinjava.com/spring-mvc/spring-mvc-multi-file-upload-example/



pom.xml

<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.3.1</version>
</dependency>
<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.6</version>
</dependency>


1. Spring MVC MultipartFile Interface
File file = new File(...);
multipartFile.transferTo(file);

2. Domain class for file uploadProduct.java

public class Product implements Serializable 
{
    private static final long serialVersionUID = 74458L;
 
    @NotNull
    @Size(min=1, max=10)
    private String name;
 
    private String description;
 
    private List<MultipartFile> images;
     
    //getters and setters
}


3. Spring MVC multi-file upload controllerDemoProductController.java


@Controller
public class DemoProductController 
{
    @RequestMapping("/save-product")
    public String uploadResources( HttpServletRequest servletRequest, 
                                 @ModelAttribute Product product,
                                 Model model) 
    {
        //Get the uploaded files and store them
        List<MultipartFile> files = product.getImages();
        List<String> fileNames = new ArrayList<String>();
        if (null != files && files.size() > 0) 
        {
            for (MultipartFile multipartFile : files) {
 
                String fileName = multipartFile.getOriginalFilename();
                fileNames.add(fileName);
 
                File imageFile = new File(servletRequest.getServletContext().getRealPath("/image"), fileName);
                try
                {
                    multipartFile.transferTo(imageFile);
                } catch (IOException e) 
                {
                    e.printStackTrace();
                }
            }
        }
 
        // Here, you can save the product details in database
         
        model.addAttribute("product", product);
        return "viewProductDetail";
    }
     
    @RequestMapping(value = "/product-input-form")
    public String inputProduct(Model model) {
        model.addAttribute("product", new Product());
        return "productForm";
    }
}


4. Spring MVC configuration changesbeans.xml

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <property name="maxUploadSize" value="20848820" />
</bean>


Equivalent Java annotation configuration is :

@Bean(name = "multipartResolver")
public CommonsMultipartResolver multipartResolver() 
{
    CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();
    multipartResolver.setMaxUploadSize(20848820);
    return multipartResolver;
}


<mvc:resources mapping="/image/**" location="/image/" />

Equivalent Annotation Configuration
@Bean(name = "multipartResolver")
public CommonsMultipartResolver multipartResolver() 
{
    CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();
    multipartResolver.setMaxUploadSize(20848820);
    return multipartResolver;
}


Completer beans.xml file used.

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
        http://www.springframework.org/schema/context/
        http://www.springframework.org/schema/context/spring-context-3.0.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
 
    <context:component-scan base-package="com.howtodoinjava.demo" />
     
    <mvc:resources mapping="/image/**" location="/image/" /> 
 
    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
    <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
     
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views/" />
        <property name="suffix" value=".jsp" />
    </bean>
     
    <bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
        <property name="basename" value="messages" />
    </bean>
     
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="maxUploadSize" value="20848820" />
    </bean>
     
</beans>




productForm.jsp



<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<!DOCTYPE html>
<html>
<head>
<title>Add Product Form</title>
</head>
<body>
    <div id="global">
        <form:form commandName="product" action="save-product" method="post" enctype="multipart/form-data">
            <fieldset>
                <legend>Add a product</legend>
                <p>
                    <label for="name">Product Name: </label>
                    <form:input id="name" path="name" cssErrorClass="error" />
                    <form:errors path="name" cssClass="error" />
                </p>
                <p>
                    <label for="description">Description: </label>
                    <form:input id="description" path="description" />
                </p>
                <p>
                    <label for="image">Product Images: </label> 
                    <input type="file" name="images" multiple="multiple"/>
                </p>
                <p id="buttons">
                    <input id="reset" type="reset" tabindex="4"> 
                    <input id="submit" type="submit" tabindex="5" value="Add Product">
                </p>
            </fieldset>
        </form:form>
    </div>
</body>
</html>




viewProductDetail.jsp
============================================================================


<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html>
<html>
<head>
<title>Save Product</title>
</head>
<body>
<div id="global">
    <h4>The product has been saved.</h4>
        <h5>Details:</h5>
        Product Name: ${product.name}<br/>
        Description: ${product.description}<br/>
        <p>Following files are uploaded successfully.</p>
        <ol>
        <c:forEach items="${product.images}" var="image">
            <li>${image.originalFilename}
            <img width="100" src="<c:url value="/image/"/>${image.originalFilename}"/>
            </li>
        </c:forEach>
        </ol>
</div>
</body>
</html>

javakrishna

Downloading And Uploading the pdf File from to the WebServer

Spring MVC Multiple File Upload Example

1. Spring MVC MultipartFile Interface

2. Domain class for file upload

3. Spring MVC multi-file upload controller

4. Spring MVC configuration changes

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