SpringMVC(五)：springMVC实现文件上传

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";
    }

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SpringMVC(五)：springMVC实现文件上传

一、文件上传的环境搭建

二、传统方式实现文件上传

三、springMVC方式实现文件上传

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