SpringBoot 文件或图片上传与下载功能的实现
导入依赖（pom.xml）<!-- 上传下载需要设计到的jar包 -->
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.6</version>
</dependency>
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.3</version>
</dependency>
<!--servlet-api导入高版本的-->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
</dependency>
<!-- 图片处理类 -->
<dependency>
<groupId>net.coobird</groupId>
<artifactId>thumbnailator</artifactId>
<version>0.4.8</version>
</dependency>
全局配置 application.properties
# 上传文件大小
spring.servlet.multipart.max-file-size=5MB
spring.servlet.multipart.max-request-size=5MB
创建 WebMvcConfig 配置类静态资源映射
@Configuration
public class WebMvcConfig implements WebMvcConfigurer {
@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
ApplicationHome h = new ApplicationHome(getClass());
File jarF = h.getSource();
String dirPath = jarF.getParentFile().toString()+"/upload/";
String os = System.getProperty("os.name");
if (os.toLowerCase().startsWith("win")) { //如果是Windows系统
registry.addResourceHandler("/upload/**").addResourceLocations("file:"+dirPath);
} else {
registry.addResourceHandler("/upload/**").addResourceLocations("file:"+dirPath);
}
}
}
文件或图片上传
控制层
// 上传文件
@ResponseBody
@RequestMapping("/upload")
public String fileUpload(@RequestParam("files") MultipartFile files) throws IOException {
//// win系统 上传路径保存设置
//// 获取项目路径
//File projectPath = new File(ResourceUtils.getURL("classpath:").getPath());
//// 绝对路径=项目路径+自定义路径
//File pathFile = new File(projectPath.getAbsolutePath(), "static/upload/");
//if (!pathFile.exists()) {
// pathFile.mkdirs();
//}
////上传文件地址
//UUID uuid = UUID.randomUUID();
//File serverFile = new File(pathFile, uuid + "_" + files.getOriginalFilename());
//files.transferTo(serverFile);
//
//String imgPath = ("/upload/" + uuid + "_" + files.getOriginalFilename()).replace("\\", "/");
//
//return imgPath;
// Linux服务器 上传路径保存设置
// 项目路径 /home/www/
File pathFile = new File("/home/www/upload/");
if (!pathFile.exists()) {
pathFile.mkdirs();
}
//上传文件地址
UUID uuid = UUID.randomUUID();
File serverFile = new File(pathFile, uuid + "_" + files.getOriginalFilename());
files.transferTo(serverFile);
String imgPath = ("/upload/" + uuid + "_" + files.getOriginalFilename()).replace("\\", "/");
return imgPath;
}
HTML页面
Ajax 无刷新上传
<form action="" class="layui-form" enctype="multipart/form-data" method="post">
<input type="hidden" name="blogImg" id="imgPath" value="">
<div class="form-group">
<label>图片上传</label>
<input type='file' style='margin: 5px;' name='files' required><br>
<button type="button" class="layui-btn" id="img_upload">上传图片</button>
</div>
<input type="submit">
</form>
JS
//普通图片上传
$('#img_upload').click(function () {
var formData = new FormData();
//获取选择的文件
$.each($('input'),function (index,item) {
formData.append("files",item.files)
});
//发送异步请求
$.ajax({
method:'post',
url: '[[@{/user/upload}]]', // 文件上传接口
data:formData,
processData: false,
contentType:false,
success:function (data) {
//成功返回触发的方法
$('#imgPath').val(data);
alert("上传成功");
},
//请求失败触发的方法
error:function () {
alert("上传失败");
}
});
});
文件或图片下载
控制层
@RequestMapping(value="/download")
public String downloads(HttpServletResponse response ,HttpServletRequest request) throws Exception{
//要下载的图片地址
String path = request.getServletContext().getRealPath("/upload");
String fileName = "基础语法.jpg";
//1、设置response 响应头
response.reset(); //设置页面不缓存,清空buffer
response.setCharacterEncoding("UTF-8"); //字符编码
response.setContentType("multipart/form-data"); //二进制传输数据
//设置响应头
response.setHeader("Content-Disposition",
"attachment;fileName="+URLEncoder.encode(fileName, "UTF-8"));
File file = new File(path,fileName);
//2、 读取文件--输入流
InputStream input=new FileInputStream(file);
//3、 写出文件--输出流
OutputStream out = response.getOutputStream();
byte[] buff =new byte;
int index=0;
//4、执行 写出操作
while((index= input.read(buff))!= -1){
out.write(buff, 0, index);
out.flush();
}
out.close();
input.close();
return null;
}
HTML页面
<a href="/download" rel="external nofollow" >点击下载</a>
SpringBoot 文件或图片上传与下载就可以了
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原文链接：https://www.cnblogs.com/dmflysky/archive/2021/02/25/14450015.html
文档来源：服务器之家http://www.zzvips.com/article/183853.html
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