SpringBoot文件上传下载和多文件上传（图文详解）

来源：互联网发布：apache velocity 教程编辑：程序博客网时间：2024/05/01 16:48

最近在学习SpringBoot，以下是最近学习整理的实现文件上传下载的java代码：
1、开发环境：
IDEA15+ Maven+JDK1.8
2、新建一个maven工程：
这里写图片描述
3、工程框架

4、pom.xml文件依赖项

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">  <modelVersion>4.0.0</modelVersion>  <groupId>SpringWebContent</groupId>  <artifactId>SpringWebContent</artifactId>  <packaging>war</packaging>  <version>1.0-SNAPSHOT</version>  <name>SpringWebContent Maven Webapp</name>  <url>http://maven.apache.org</url>  <parent>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-starter-parent</artifactId>    <version>1.4.3.RELEASE</version>  </parent>  <dependencies>    <dependency>      <groupId>org.springframework.boot</groupId>      <artifactId>spring-boot-starter-thymeleaf</artifactId>    </dependency>    <dependency>      <groupId>org.springframework.boot</groupId>      <artifactId>spring-boot-devtools</artifactId>      <optional>true</optional>    </dependency>    <dependency>      <groupId>junit</groupId>      <artifactId>junit</artifactId>      <version>3.8.1</version>      <scope>test</scope>    </dependency>  </dependencies>  <properties>    <java.version>1.8</java.version>  </properties>  <build>    <finalName>SpringWebContent</finalName>  <plugins>  <plugin>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-maven-plugin</artifactId>  </plugin></plugins>  </build></project>

5、Application.java

import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplicationpublic class Application {    public static void main(String[] args) {        SpringApplication.run(Application.class, args);    }}

6、FileController.java

import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.RequestParam;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.web.bind.annotation.ResponseBody;import org.springframework.web.multipart.MultipartFile;import org.springframework.web.multipart.MultipartHttpServletRequest;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.*;import java.util.List;@Controllerpublic class FileController {    @RequestMapping("/greeting")    public String greeting(@RequestParam(value="name", required=false, defaultValue="World") String name, Model model) {        model.addAttribute("name", name);        return "greeting";    }    private static final Logger logger = LoggerFactory.getLogger(FileController.class);    //文件上传相关代码    @RequestMapping(value = "upload")    @ResponseBody    public String upload(@RequestParam("test") MultipartFile file) {        if (file.isEmpty()) {            return "文件为空";        }        // 获取文件名        String fileName = file.getOriginalFilename();        logger.info("上传的文件名为：" + fileName);        // 获取文件的后缀名        String suffixName = fileName.substring(fileName.lastIndexOf("."));        logger.info("上传的后缀名为：" + suffixName);        // 文件上传后的路径        String filePath = "E://test//";        // 解决中文问题，liunx下中文路径，图片显示问题        // fileName = UUID.randomUUID() + suffixName;        File dest = new File(filePath + fileName);        // 检测是否存在目录        if (!dest.getParentFile().exists()) {            dest.getParentFile().mkdirs();        }        try {            file.transferTo(dest);            return "上传成功";        } catch (IllegalStateException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }        return "上传失败";    }    //文件下载相关代码    @RequestMapping("/download")    public String downloadFile(org.apache.catalina.servlet4preview.http.HttpServletRequest request, HttpServletResponse response){        String fileName = "FileUploadTests.java";        if (fileName != null) {            //当前是从该工程的WEB-INF//File//下获取文件(该目录可以在下面一行代码配置)然后下载到C:\\users\\downloads即本机的默认下载的目录            String realPath = request.getServletContext().getRealPath(                    "//WEB-INF//");            File file = new File(realPath, fileName);            if (file.exists()) {                response.setContentType("application/force-download");// 设置强制下载不打开                response.addHeader("Content-Disposition",                        "attachment;fileName=" +  fileName);// 设置文件名                byte[] buffer = new byte[1024];                FileInputStream fis = null;                BufferedInputStream bis = null;                try {                    fis = new FileInputStream(file);                    bis = new BufferedInputStream(fis);                    OutputStream os = response.getOutputStream();                    int i = bis.read(buffer);                    while (i != -1) {                        os.write(buffer, 0, i);                        i = bis.read(buffer);                    }                    System.out.println("success");                } catch (Exception e) {                    e.printStackTrace();                } finally {                    if (bis != null) {                        try {                            bis.close();                        } catch (IOException e) {                            e.printStackTrace();                        }                    }                    if (fis != null) {                        try {                            fis.close();                        } catch (IOException e) {                            e.printStackTrace();                        }                    }                }            }        }        return null;    }    //多文件上传    @RequestMapping(value = "/batch/upload", method = RequestMethod.POST)    @ResponseBody    public String handleFileUpload(HttpServletRequest request) {        List<MultipartFile> files = ((MultipartHttpServletRequest) request)                .getFiles("file");        MultipartFile file = null;        BufferedOutputStream stream = null;        for (int i = 0; i < files.size(); ++i) {            file = files.get(i);            if (!file.isEmpty()) {                try {                    byte[] bytes = file.getBytes();                    stream = new BufferedOutputStream(new FileOutputStream(                            new File(file.getOriginalFilename())));                    stream.write(bytes);                    stream.close();                } catch (Exception e) {                    stream = null;                    return "You failed to upload " + i + " => "                            + e.getMessage();                }            } else {                return "You failed to upload " + i                        + " because the file was empty.";            }        }        return "upload successful";    }

7、index.html

<!DOCTYPE html><html lang="en"><head>    <title>Getting Started: Serving Web Content</title>    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /></head><body><p>Get your greeting <a href="/greeting">here</a></p><form action="/upload" method="POST" enctype="multipart/form-data">    文件：<input type="file" name="test"/>    <input type="submit" /></form><a href="/download">下载test</a><p>多文件上传</p><form method="POST" enctype="multipart/form-data" action="/batch/upload">    <p>文件1：<input type="file" name="file" /></p>    <p>文件2：<input type="file" name="file" /></p>    <p><input type="submit" value="上传" /></p></form></html>

本文代码参考Spring官网：https://spring.io/guides/gs/serving-web-content/
完整工程地址：http://download.csdn.net/detail/coding13/9739116

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