详解SpringBoot文件上传下载和多文件上传（图文）

详解SpringBoot文件上传下载和多文件上传（图文）

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：

3、工程框架

4、pom.xml文件依赖项

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

4.0.0

SpringWebContent

SpringWebContent

war

1.0-SNAPSHOT

SpringWebContent Maven Webapp

http://maven.apache.org

org.springframework.boot

spring-boot-starter-parent

1.4.3.RELEASE

org.springframework.boot

spring-boot-starter-thymeleaf

org.springframework.boot

spring-boot-devtools

true

junit

junit

3.8.1

test

1.8

SpringWebContent

org.springframework.boot

spring-boot-maven-plugin

xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

4.0.0

SpringWebContent

SpringWebContent

war

1.0-SNAPSHOT

SpringWebContent Maven Webapp

http://maven.apache.org

org.springframework.boot

spring-boot-starter-parent

1.4.3.RELEASE

org.springframework.boot

spring-boot-starter-thymeleaf

org.springframework.boot

spring-boot-devtools

true

junit

junit

3.8.1

test

1.8

SpringWebContent

org.springframework.boot

spring-boot-maven-plugin

5、Application.java

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication

public 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;

@Controller

public 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();

kfQuHq } 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 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

Get your greeting here

文件：

下载test

多文件上传

文件1：

文件2：

完整工程地址：SpringWebContent_jb51.rar

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