file upload max size controller, handler (#999)

* file upload max size controller, handler

* add controller advice

* update controller

* add reset button

spring-mvc-forms/pom.xml

@@ -41,7 +41,11 @@
             <version>${hibernate-validator.version}</version>
         </dependency>
 
-
+        <dependency>
+        	<groupId>commons-fileupload</groupId>
+        	<artifactId>commons-fileupload</artifactId>
+        	<version>${fileupload.version}</version>
+        </dependency>
     </dependencies>
     <profiles>
         <!-- Local -->
@@ -93,6 +97,7 @@
         <maven-compiler-plugin.source>1.8</maven-compiler-plugin.source>
         <hibernate-validator.version>5.3.3.Final</hibernate-validator.version>
         <deploy-path>enter-location-of-server</deploy-path>
+		<fileupload.version>1.3.2</fileupload.version>
     </properties>
 
 </project>

spring-mvc-forms/src/main/java/com/baeldung/springmvcforms/configuration/ApplicationConfiguration.java

@@ -3,6 +3,8 @@ package com.baeldung.springmvcforms.configuration;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.ComponentScan;
 import org.springframework.context.annotation.Configuration;
+import org.springframework.web.multipart.MultipartResolver;
+import org.springframework.web.multipart.commons.CommonsMultipartResolver;
 import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
 import org.springframework.web.servlet.config.annotation.EnableWebMvc;
 import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
@@ -26,4 +28,10 @@ class ApplicationConfiguration extends WebMvcConfigurerAdapter {
         return bean;
     }
 
+    @Bean
+    public MultipartResolver multipartResolver() {
+        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();
+        multipartResolver.setMaxUploadSize(5242880);
+        return multipartResolver;
+    }
 }

spring-mvc-forms/src/main/java/com/baeldung/springmvcforms/controller/FileUploadController.java

@@ -0,0 +1,52 @@
+package com.baeldung.springmvcforms.controller;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.multipart.MaxUploadSizeExceededException;
+import org.springframework.web.multipart.MultipartFile;
+import org.springframework.web.servlet.HandlerExceptionResolver;
+import org.springframework.web.servlet.ModelAndView;
+
+@Controller
+public class FileUploadController implements HandlerExceptionResolver {
+
+    @RequestMapping(value = "/uploadFile", method = RequestMethod.GET)
+    public String getImageView() {
+        return "file";
+    }
+
+    @RequestMapping(value = "/uploadFile", method = RequestMethod.POST)
+    public ModelAndView uploadFile(MultipartFile file) throws IOException{
+        ModelAndView modelAndView = new ModelAndView("file");
+        
+	    InputStream in = file.getInputStream();
+        File currDir = new File(".");
+        String path = currDir.getAbsolutePath();
+        FileOutputStream f = new FileOutputStream(path.substring(0, path.length()-1)+ file.getOriginalFilename());
+        int ch = 0;
+        while ((ch = in.read()) != -1) {
+            f.write(ch);
+        }
+        f.flush();
+        f.close();
+
+        modelAndView.getModel().put("message", "File uploaded successfully!");
+        return modelAndView;
+    }
+    
+    @Override
+    public ModelAndView resolveException(HttpServletRequest request, HttpServletResponse response, Object object, Exception exc) {        
+        ModelAndView modelAndView = new ModelAndView("file");
+        if (exc instanceof MaxUploadSizeExceededException) {
+            modelAndView.getModel().put("message", "File size exceeds limit!");
+        }
+        return modelAndView;
+    }
+}

spring-mvc-forms/src/main/java/com/baeldung/springmvcforms/interceptor/FileUploadExceptionAdvice.java

@@ -0,0 +1,19 @@
+package com.baeldung.springmvcforms.interceptor;
+
+import org.springframework.web.servlet.ModelAndView;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import org.springframework.web.multipart.MaxUploadSizeExceededException;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+
+@ControllerAdvice
+public class FileUploadExceptionAdvice {
+    
+    @ExceptionHandler(MaxUploadSizeExceededException.class)
+    public ModelAndView handleMaxSizeException(MaxUploadSizeExceededException exc, HttpServletRequest request, HttpServletResponse response){
+        ModelAndView modelAndView = new ModelAndView("file");
+        modelAndView.getModel().put("message", "File too large!");
+        return modelAndView;
+    }
+}

spring-mvc-forms/src/main/webapp/WEB-INF/views/file.jsp

@@ -0,0 +1,23 @@
+<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
+    pageEncoding="ISO-8859-1"%>
+<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
+<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
+<html>
+<head>
+<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
+<title>Upload file</title>
+</head>
+<body>
+<c:url value="/uploadFile" var="uploadFileUrl" />
+<form method="post" enctype="multipart/form-data" action="${uploadFileUrl}">
+<input type="file" name="file"/>
+<input type="submit" value="Upload file"/>
+</form>
+<br />
+${message }
+<br /> <br />
+<form method="GET" action="${uploadFileUrl}" >
+<input type="submit" value="Reset" />
+</form>   
+</body>
+</html>