p

src/main/java/com/yhjd/controller/UploadController.java

@@ -1,5 +1,6 @@
 package com.yhjd.controller;
 
+import com.yhjd.util.DownloadUtil;
 import io.swagger.annotations.Api;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -36,7 +37,7 @@ public class UploadController {
         try {
             file.transferTo(dest);
             LOGGER.info("上传成功");
-            return "上传成功";
+            return fileName;
         } catch (IOException e) {
             LOGGER.error(e.toString(), e);
         }
@@ -69,40 +70,11 @@ public class UploadController {
 
     }
 
-    @PostMapping("/download")
+    @GetMapping("/download")
     @ResponseBody
-    public void download(HttpServletRequest request, HttpServletResponse response)
+    public void download(String fileName,HttpServletRequest request, HttpServletResponse response)
             throws ServletException, IOException {
-        //获取下载文件，绝对路径
-        String fileName = request.getParameter("fileName");
         String filePath = System.getProperty("user.home") + File.separator + "img" + File.separator;
-        //解码
-        fileName = URLDecoder.decode(fileName, "UTF-8");
-        //文件名
-        String realName = fileName.substring(fileName.lastIndexOf("/")+1);
-        System.out.println(fileName+"--->"+realName);
-        File file = new File(filePath+fileName);
-        if(!file.exists()){
-            request.setAttribute("message", "资源已删除");
-            request.getRequestDispatcher("/WEB-INF/download.jsp").forward(request, response);
-            return;
-        }
-        //设置响应头，控制浏览器下载该文件
-        realName = new String(realName.getBytes("UTF-8"),"ISO-8859-1");
-        response.setHeader("content-disposition", "attachment;filename=" + realName);
-        //response.setHeader("content-disposition", "attachment;filename=" + URLEncoder.encode(realName, "UTF-8"));	//编码
-        //读取要下载的文件，保存到文件输入流
-        FileInputStream in = new FileInputStream(fileName);
-        //输出流
-        OutputStream out = response.getOutputStream();
-        //缓冲区
-        byte buffer[] = new byte[4096];
-        int len = 0;
-        while((len=in.read(buffer))>0){
-            out.write(buffer, 0, len);
-        }
-        in.close();
-        out.close();
-
+        DownloadUtil.downloadFile(filePath+fileName,fileName,response,request);
     }
 }

src/main/java/com/yhjd/util/DownloadUtil.java

@@ -0,0 +1,108 @@
+package com.yhjd.util;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.*;
+import java.net.URLEncoder;
+
+/***
+ * 将文件内容响应到浏览器
+ */
+public class DownloadUtil {
+
+    // 字符编码格式
+    private static String charsetCode = "utf-8";
+
+
+    /**
+     * 文件的内容类型
+     */
+    private static String getFileContentType(String name){
+        String result = "";
+        String fileType = name.toLowerCase();
+        if (fileType.endsWith(".png")) {
+            result = "image/png";
+        } else if (fileType.endsWith(".gif")) {
+            result = "image/gif";
+        } else if (fileType.endsWith(".jpg") || fileType.endsWith(".jpeg")) {
+            result = "image/jpeg";
+        } else if(fileType.endsWith(".svg")){
+            result = "image/svg+xml";
+        }else if (fileType.endsWith(".doc")) {
+            result = "application/msword";
+        } else if (fileType.endsWith(".xls")) {
+            result = "application/x-excel";
+        } else if (fileType.endsWith(".zip")) {
+            result = "application/zip";
+        } else if (fileType.endsWith(".pdf")) {
+            result = "application/pdf";
+        } else {
+            result = "application/octet-stream";
+        }
+        return result;
+    }
+
+    /**
+     * 下载文件
+     * @param path 文件的位置
+     * @param fileName 自定义下载文件的名称
+     * @param resp http响应
+     * @param req http请求
+     */
+    public static void downloadFile(String path, String fileName, HttpServletResponse resp, HttpServletRequest req){
+
+        try {
+            File file = new File(path);
+            /**
+             * 中文乱码解决
+             */
+            String type = req.getHeader("User-Agent").toLowerCase();
+            if(type.indexOf("firefox")>0 || type.indexOf("chrome")>0){
+                /**
+                 * 谷歌或火狐
+                 */
+                fileName = new String(fileName.getBytes(charsetCode), "iso8859-1");
+            }else{
+                /**
+                 * IE
+                 */
+                fileName = URLEncoder.encode(fileName, charsetCode);
+            }
+            // 设置响应的头部信息
+            resp.setHeader("content-disposition", "attachment;filename=" + fileName);
+            // 设置响应内容的类型
+            resp.setContentType(getFileContentType(fileName)+"; charset=" + charsetCode);
+            // 设置响应内容的长度
+            resp.setContentLength((int) file.length());
+            // 输出
+            outStream(new FileInputStream(file), resp.getOutputStream());
+        } catch (Exception e) {
+            System.out.println("执行downloadFile发生了异常：" + e.getMessage());
+        }
+    }
+
+    /**
+     * 基础字节数组输出
+     */
+    private static void outStream(InputStream is, OutputStream os) {
+        try {
+            byte[] buffer = new byte[10240];
+            int length = -1;
+            while ((length = is.read(buffer)) != -1) {
+                os.write(buffer, 0, length);
+                os.flush();
+            }
+        } catch (Exception e) {
+            System.out.println("执行 outStream 发生了异常：" + e.getMessage());
+        } finally {
+            try {
+                os.close();
+            } catch (IOException e) {
+            }
+            try {
+                is.close();
+            } catch (IOException e) {
+            }
+        }
+    }
+
+}