English | 简体中文 | 繁體中文 | Русский язык | Français | Español | Português | Deutsch | 日本語 | 한국어 | Italiano | بالعربية
Spring MVC fornisce un metodo semplice per l'upload di file, che può essere un'immagine o qualsiasi altro tipo di file. Vediamo un esempio semplice di upload di file utilizzando Spring MVC.
Per eseguire questo esempio, devi caricare:
File jar di Spring Core File jar di Spring Web File commons-fileupload.jar e commons-io.jar
1)Scarica tutti i file jar di Spring, inclusi core, web, aop, mvc, j2ee, gestione remota, oxm, jdbc, orm, ecc.
2)Scarica commons-io.jar
3)Scarica Commons -fileupload.jar
1)Aggiungi i file commons-io e fileupload.jar
2)Aggiungi CommonsMultipartResolver nel file spring-servlet.xml
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>
3)Crea un modulo per inviare il file. Il nome del metodo deve essere "post" e inserisci "multiple/form-data".
<form action="savefile" method="post" enctype="multipart/form-data"> Seleziona File: <input type="file" name="file"/> <input type="submit" value="Carica File"/> </form>
4)Utilizza la classe CommonsMultipartFile nel Controller.
@RequestMapping(value="/savefile",method=RequestMethod.POST)
public ModelAndView upload(@RequestParam CommonsMultipartFile file, HttpSession session){
String path=session.getServletContext().getRealPath("/");
String filename=file.getOriginalFilename();
System.out.println(path + " "+ filename);
try{
byte barr[]=file.getBytes();
BufferedOutputStream bout=new BufferedOutputStream(
new FileOutputStream(path+"/"+filename));
bout.write(barr);
bout.flush();
bout.close();
}catch(Exception e){System.out.println(e);}
return new ModelAndView("upload-success","filename",path+"/"+filename);
}
5) Mostra l'immagine nel JSP.
<h1>Caricamento Avvenuto</h1>
<img src="${filename}"/>Crea directory immagini
Crea una directory "immagini" nel tuo progetto, poiché stiamo scrivendo codice che salva tutti i file nella directory "/immagini".
index.jsp
<a href="uploadform">Carica Immagine</a>
Emp.java
package com.w3codebox;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.commons.CommonsMultipartFile;
import org.springframework.web.servlet.ModelAndView;
@Controller
public class HelloController {
private static final String UPLOAD_DIRECTORY =
@RequestMapping("uploadform")
public ModelAndView uploadForm(){
return new ModelAndView("uploadform");
}
@RequestMapping(value="savefile",method=RequestMethod.POST)
public ModelAndView saveimage(@RequestParam CommonsMultipartFile file,
HttpSession session) throws Exception{
ServletContext context = session.getServletContext();
String path = context.getRealPath(UPLOAD_DIRECTORY);
String filename = file.getOriginalFilename();
System.out.println(path + " "+ filename);
byte[] bytes = file.getBytes();
BufferedOutputStream stream = new BufferedOutputStream(new FileOutputStream(
new File(path + File.separator + filename)));
stream.write(bytes);
stream.flush();
stream.close();
return new ModelAndView("uploadform","filesuccess","File successfully saved!");
}
}
web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <servlet> <servlet-name>spring</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>spring</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
spring-servlet.xml
Ecco, è necessario creare un bean per CommonsMultipartResolver.
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p" xmlns:context="http://www.springframework.org/schema/context" 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"> <context:component-scan base-package="com.w3codebox"></context:component-scan> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/"></property> <property name="suffix" value=".jsp"></property> </bean> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/> </beans>
uploadform.jsp
Il modulo in questo luogo deve essere method = "post" e enctype = "multipart/form-data".
<%@taglib uri="http://www.springframework.org/tags/form" prefix="form"%>
<!DOCTYPE html>
<html>
<head>
<title>Caricamento File Immagine</title>
</head>
<body>
<h1>Esempio di Caricamento File - w3codebox</h1>
<h3 style="color:red">${filesuccess}</h3>
<form:form method="post" action="savefile" enctype="multipart/form-data">
<p><label for="image">Scegli Immagine</label></p>
<p><input name="file" id="fileToUpload" type="file" /></p>
<p><input type="submit" value="Carica"></p>
</form:form>
</body>
</html>
Output
Vai al percorso visualizzato sul server di controllo per vedere i file caricati.