springmvc使用ApacheFileUpload组件实现文件上传步骤详解

悠悠 2022-03-10 15:20 217阅读 0赞

**步骤**

1.  添加依赖
2.  upload.jsp页面
3.  UploadController.java 控制器
4.  测试

**实现**

1.  添加依赖
    
        
        <dependency>
          <groupId>commons-fileupload</groupId>
          <artifactId>commons-fileupload</artifactId>
          <version>1.3.1</version>
        </dependency>
2.  upload.jsp页面

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
    <html>
    <head>
        <title>upload</title>
    </head>
    <body>
        <form action="/fileUpload" method="post" enctype="multipart/form-data">
            用户名：<input type="text" name="username"> <br>
            文件： <input type="file" name="imgFile"> <br>
            <input type="submit" value="上传">
        </form>
    </body>
    </html>

1.  UploadController.java 控制器
    
        package com.lilei.upload;
        
        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.springframework.stereotype.Controller;
        import org.springframework.web.bind.annotation.RequestMapping;
        
        import javax.servlet.http.HttpServletRequest;
        import java.io.File;
        import java.text.SimpleDateFormat;
        import java.util.Date;
        import java.util.List;
        import java.util.UUID;
        
        /** * 1.Apache提供的文件上传支持 */
        @Controller
        public class UploadController { 
        
            @RequestMapping("/fileUpload")
            public String upload(HttpServletRequest request) throws Exception { 
                //1. 获取上传的目录路径
                // H:/classes/baseproject/springmvc02/target/springmvc02-1.0-SNAPSHOT/upload
                String path = request.getSession().getServletContext().getRealPath("/upload");
        
                //2. 以天为单位，一天创建一个文件夹，保存当天上传的文件
                String date = new SimpleDateFormat("yyyy-MM-dd").format(new Date());
        
                //3. 创建目录
                File file = new File(path,date);
                if (!file.exists()){ 
                    // 创建目录或子目录
                    file.mkdirs();
                }
        
                //4. 文件上传
                //4.1 FileItem的工厂
                FileItemFactory factory = new DiskFileItemFactory();
                //4.2 文件上传组件提供的文件上传核心Api，对象servlet中文件上传提供支持。
                ServletFileUpload upload = new ServletFileUpload(factory);
                //4.3 把request对象，转换为FileItem
                // <input type="text" name="username"> 用FileItem封装
                // <input type="file" name="imgFile"> 用FileItem封装
                List<FileItem> items = upload.parseRequest(request);
                //4.4 遍历
                for (FileItem item : items){ 
                    if (item.isFormField()){ 
                        // 说明是普通文本框:<input type="text" name="username">
                        System.out.println("用户名:" + item.getString("UTF-8"));
                    } else { 
                        // 说明是文件域：<input type="file" name="imgFile"> ，就要文件上传
                        //a. 获取文件名
                        String fileName = item.getName();
                        //b. 处理文件名唯一. 文件名=uuid + 文件后缀
                        fileName = UUID.randomUUID().toString() + fileName.substring(fileName.lastIndexOf("."));
                        //c. 上传 【最关键】
                        item.write(new File(file,fileName));
                        //d. 删除临时文件
                        item.delete();
                    }
                }
                return "success";
            }
        
            public static void main(String[] args) { 
                String fileName = "a.jpg";
                String result = UUID.randomUUID().toString() + fileName.substring(fileName.lastIndexOf("."));
                System.out.println(result);
            }
        
        }

之后就可以实现上传了