一、文件上传的环境搭建
1、使用的jar坐标
<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>2.4</version>
</dependency>
2、 上传文件的页面
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>文件上传的实现</title>
</head>
<body>
<h3>1、传统文件上传</h3>
<form action="/fileupload/traditionFileupload" method="post" enctype="multipart/form-data">
选择文件:<input type="file" name="upload" />
<input type="submit" value="上传" />
</form>
<h3>2、springmvc文件上传</h3>
<form action="/fileupload/springmvcFileupload" method="post" enctype="multipart/form-data">
选择文件:<input type="file" name="upload" />
<input type="submit" value="上传" />
</form>
</body>
</html>
3、创建处理控制类Controller
package com.wedu.springmvc.web;
import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.WebResource;
import org.apache.commons.fileupload.FileItem;
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.RequestMapping;
import org.springframework.web.multipart.MultipartFile;
import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.util.List;
import java.util.UUID;
/**
* springmvc实现文件上传
*/
@Controller
@RequestMapping("/fileupload")
public class FileuploadController {
}
二、传统方式实现文件上传
/**
* 传统模式的文件上传
* @return
*/
@RequestMapping("/traditionFileupload")
public String traditionFileupload(HttpServletRequest request) throws Exception{
// 上传的位置
String path = request.getSession().getServletContext().getRealPath("/uploads/");
// 判断,该路径是否存在
File file = new File(path);
if(!file.exists()){
// 创建该文件夹
file.mkdirs();
}
// 解析request对象,获取上传文件项
DiskFileItemFactory factory = new DiskFileItemFactory();
ServletFileUpload upload = new ServletFileUpload(factory);
// 解析request
List<FileItem> items = upload.parseRequest(request);
// 遍历
for(FileItem item:items){
// 进行判断,当前item对象是否是上传文件项
if(item.isFormField()){
// 说明普通表单向
}else{
// 说明上传文件项
// 获取上传文件的名称
String filename = item.getName();
// 把文件的名称设置唯一值,uuid
String uuid = UUID.randomUUID().toString().replace("-", "");
filename = uuid+"_"+filename;
// 完成文件上传
item.write(new File(path,filename));
// 删除临时文件
item.delete();
}
}
return "success";
}
三、springMVC方式实现文件上传
/**
* 使用springmvc实现文件上传
* @return
*/
@RequestMapping("/springmvcFileupload")
public String springmvcFileupload(HttpServletRequest request, MultipartFile upload) throws Exception{
// 1、设置上传的路径
String path = request.getSession().getServletContext().getRealPath("/uploads/");
// 2、判断上传的路径是否存在
File file = new File(path);
if(!file.exists()){
file.mkdirs();
}
// 3、设置上传文件的文件名,保证文件名唯一
String filename = upload.getOriginalFilename();
String uuid = UUID.randomUUID().toString().replace("-", "");
filename = uuid+"_"+filename;
// 4、完成文件上传
upload.transferTo(new File(path,filename));
return "success";
}