자바 업로드 및 다운로드 기능 구현(여러 파일 동시 업로드 지원)
프로젝트 구 조 는 다음 과 같 습 니 다.(이것 은 제 가 이전에 만 든 SSM 통합 프레임 워 크 프로젝트 입 니 다.이 위 에 파일 업로드 와 다운 로드 를 추가 합 니 다)
주로 FileUploadController,doupload.jsp,up.jsp,springmvc.xml 입 니 다.
1.up.jsp 먼저 작성
<form action="doupload.jsp" enctype="multipart/form-data" method="post">
<p> ：<input type="text" name="user"></p>
<p> ：<input type="file" name="nfile"></p>
<p> ：<input type="file" name="nfile1"></p>
<p><input type="submit" value=" "></p>
</form>2.doupload.jsp 작성
<%
request.setCharacterEncoding("utf-8");
String uploadFileName = ""; //
String fieldName = ""; // name
// multipart
boolean isMultipart = ServletFileUpload.isMultipartContent(request);
// （ ）
String uploadFilePath = request.getSession().getServletContext().getRealPath("upload/" );
if (isMultipart) {
FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
try {
// form
List<FileItem> items = upload.parseRequest(request);
Iterator<FileItem> iter = items.iterator();
while (iter.hasNext()) { //
FileItem item = (FileItem) iter.next();
if (item.isFormField()){ //
fieldName = item.getFieldName(); // name
if (fieldName.equals("user")){
//
out.print(item.getString("UTF-8")+" 。<br/>");
}
}else{ //
String fileName = item.getName();
if (fileName != null && !fileName.equals("")) {
File fullFile = new File(item.getName());
File saveFile = new File(uploadFilePath, fullFile.getName());
item.write(saveFile);
uploadFileName = fullFile.getName();
out.print(" ："+uploadFileName);
out.print("\t\t :"+"<a href='download.action?name="+uploadFileName+"'>"+uploadFileName+"</a>");
out.print("<br/>");
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
%>효과 그림:
3.FilterController 를 작성 하여 파일 다운 로드 를 실현 하 는 기능(업로드 보다 간단 함):
@Controller
public class FileUploadController {
@RequestMapping(value="/download")
public ResponseEntity<byte[]> download(HttpServletRequest request,HttpServletResponse response,@RequestParam("name") String filename)throws Exception {
// ，
filename=new String(filename.getBytes("iso-8859-1"),"UTF-8");
//
String path = request.getServletContext().getRealPath("/upload/");
File file = new File(path + File.separator + filename);
HttpHeaders headers = new HttpHeaders();
// ，
String downloadFielName = new String(filename.getBytes("iso-8859-1"),"UTF-8");
// attachment（ ）
headers.setContentDispositionFormData("Content-Disposition", downloadFielName);
//application/octet-stream ： （ ）。
headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),
headers, HttpStatus.CREATED);
}
}
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- ， （10MB） -->
<property name="maxUploadSize">
<value>10485760</value>
</property>
<!-- ， jSP pageEncoding ， ， ISO-8859-1 -->
<property name="defaultEncoding">
<value>UTF-8</value>
</property>
</bean>up.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>File </title>
</head>
<body>
<form action="doupload.jsp" enctype="multipart/form-data" method="post">
<p> ：<input type="text" name="user"></p>
<p> ：<input type="file" name="nfile"></p>
<p> ：<input type="file" name="nfile1"></p>
<p><input type="submit" value=" "></p>
</form>
</body>
</html>
<%@ page language="java" pageEncoding="UTF-8"%>
<%@page import="java.io.*,java.util.*"%>
<%@page import="org.apache.commons.fileupload.*"%>
<%@page import="org.apache.commons.fileupload.disk.DiskFileItemFactory" %>
<%@page import="org.apache.commons.fileupload.servlet.ServletFileUpload"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title> </title>
</head>
<body>
<%
request.setCharacterEncoding("utf-8");
String uploadFileName = ""; //
String fieldName = ""; // name
// multipart
boolean isMultipart = ServletFileUpload.isMultipartContent(request);
// （ ）
String uploadFilePath = request.getSession().getServletContext().getRealPath("upload/" );
if (isMultipart) {
FileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
try {
// form
List<FileItem> items = upload.parseRequest(request);
Iterator<FileItem> iter = items.iterator();
while (iter.hasNext()) { //
FileItem item = (FileItem) iter.next();
if (item.isFormField()){ //
fieldName = item.getFieldName(); // name
if (fieldName.equals("user")){
//
out.print(item.getString("UTF-8")+" 。<br/>");
}
}else{ //
String fileName = item.getName();
if (fileName != null && !fileName.equals("")) {
File fullFile = new File(item.getName());
File saveFile = new File(uploadFilePath, fullFile.getName());
item.write(saveFile);
uploadFileName = fullFile.getName();
out.print(" ："+uploadFileName);
out.print("\t\t :"+"<a href='download.action?name="+uploadFileName+"'>"+uploadFileName+"</a>");
out.print("<br/>");
}
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
%>
</body>
</html>
package ssm.me.controller;
import java.io.File;
import java.net.URLDecoder;
import java.util.Iterator;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileItemFactory;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.io.FileUtils;
import org.junit.runners.Parameterized.Parameter;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
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.MultipartFile;
@Controller
public class FileUploadController {
@RequestMapping(value="/download")
public ResponseEntity<byte[]> download(HttpServletRequest request,HttpServletResponse response,@RequestParam("name") String filename)throws Exception {
// ，
filename=new String(filename.getBytes("iso-8859-1"),"UTF-8");
//
String path = request.getServletContext().getRealPath("/upload/");
File file = new File(path + File.separator + filename);
HttpHeaders headers = new HttpHeaders();
// ，
String downloadFielName = new String(filename.getBytes("iso-8859-1"),"UTF-8");
// attachment（ ）
headers.setContentDispositionFormData("Content-Disposition", downloadFielName);
//application/octet-stream ： （ ）。
headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),
headers, HttpStatus.CREATED);
}
}
<?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:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.2.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">
<!-- -->
<mvc:annotation-driven></mvc:annotation-driven>
<!-- Controller -->
<context:component-scan base-package="ssm.me.controller"></context:component-scan>
<!-- -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"></bean>
<bean id="multipartResolver"
class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- ， （10MB） -->
<property name="maxUploadSize">
<value>10485760</value>
</property>
<!-- ， jSP pageEncoding ， ， ISO-8859-1 -->
<property name="defaultEncoding">
<value>UTF-8</value>
</property>
</bean>
</beans>
<?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">
<display-name>Student</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- -->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>*.action</url-pattern>
</servlet-mapping>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/applicationContext-*.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
</web-app>이상 이 바로 본 고의 모든 내용 입 니 다.여러분 의 학습 에 도움 이 되 고 저 희 를 많이 응원 해 주 셨 으 면 좋 겠 습 니 다.
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