SpringBoot 文件或圖片上傳與下載

  • 導入依賴(pom.xml)

     <!-- 上傳下載須要設計到的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導入高版本的-->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.1</version>
        </dependency>
        <!-- 圖片處理類 -->
        <dependency>
            <groupId>net.coobird</groupId>
            <artifactId>thumbnailator</artifactId>
            <version>0.4.8</version>
        </dependency>
  • 全局配置 application.properties

# 上傳文件大小
spring.servlet.multipart.max-file-size=5MB
spring.servlet.multipart.max-request-size=5MB
  • 建立 WebMvcConfig 配置類  靜態資源映射

@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")) {  //若是是Windows系統
            registry.addResourceHandler("/upload/**").addResourceLocations("file:"+dirPath);
        } else {
            registry.addResourceHandler("/upload/**").addResourceLocations("file:"+dirPath);
        }
    }

}
  • 文件或圖片上傳

  • 控制層
// 上傳文件
    @ResponseBody
    @RequestMapping("/upload")
    public String fileUpload(@RequestParam("files") MultipartFile files) throws IOException {
//        // win系統 上傳路徑保存設置
//        // 獲取項目路徑
//        File projectPath = new File(ResourceUtils.getURL("classpath:").getPath());
//        // 絕對路徑=項目路徑+自定義路徑
//        File pathFile = new File(projectPath.getAbsolutePath(), "static/upload/");
//        if (!pathFile.exists()) {
//            pathFile.mkdirs();
//        }
//        //上傳文件地址
//        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服務器  上傳路徑保存設置
        // 項目路徑  /home/www/
        File pathFile = new File("/home/www/upload/");
        if (!pathFile.exists()) {
            pathFile.mkdirs();
        }
        //上傳文件地址
        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頁面    Ajax 無刷新上傳 

<form action="" class="layui-form" enctype="multipart/form-data" method="post">
  <input type="hidden" name="blogImg" id="imgPath" value="">
  <div class="form-group">
    <label>圖片上傳</label>
    <input type='file' style='margin: 5px;' name='files' required><br>
    <button type="button" class="layui-btn" id="img_upload">上傳圖片</button>
  </div>
  <input type="submit">
</form>
  • JS

//普通圖片上傳
        $('#img_upload').click(function () {
            var formData = new FormData();
            //獲取選擇的文件
            $.each($('input[name="files"]'),function (index,item) {
                formData.append("files",item.files[0])
            });

            //發送異步請求
            $.ajax({
                method:'post',
                url: '[[@{/user/upload}]]', // 文件上傳接口
                data:formData,
                processData: false,
                contentType:false,
                success:function (data) {
                    //成功返回觸發的方法
                    $('#imgPath').val(data);
                    alert("上傳成功");
                },
                //請求失敗觸發的方法
                error:function () {
                    alert("上傳失敗");
                }
            });
        });
  • 文件或圖片下載

  • 控制層
@RequestMapping(value="/download")
public String downloads(HttpServletResponse response ,HttpServletRequest request) throws Exception{
   //要下載的圖片地址
   String  path = request.getServletContext().getRealPath("/upload");
   String  fileName = "基礎語法.jpg";

   //一、設置response 響應頭
   response.reset(); //設置頁面不緩存,清空buffer
   response.setCharacterEncoding("UTF-8"); //字符編碼
   response.setContentType("multipart/form-data"); //二進制傳輸數據
   //設置響應頭
   response.setHeader("Content-Disposition",
           "attachment;fileName="+URLEncoder.encode(fileName, "UTF-8"));

   File file = new File(path,fileName);
   //二、 讀取文件--輸入流
   InputStream input=new FileInputStream(file);
   //三、 寫出文件--輸出流
   OutputStream out = response.getOutputStream();

   byte[] buff =new byte[1024];
   int index=0;
   //四、執行 寫出操做
   while((index= input.read(buff))!= -1){
       out.write(buff, 0, index);
       out.flush();
  }
   out.close();
   input.close();
   return null;
}
  • HTML頁面  

<a href="/download">點擊下載</a>
  • SpringBoot 文件或圖片上傳與下載就能夠了 

 

 

參考資料:狂神說SpringMVC:文件上傳下載java

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