技術標籤：java

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

        //1. 要獲取下載檔案的路徑
        String realPath = "D:\\idea_workspace\\webapp-maven\\response-test\\src\\main\\resources\\1.png";
        System.out.
 
println("下載檔案的路徑:"+realPath);
        //2. 下載的檔名
        String fileName = realPath.substring(realPath.lastIndexOf("\\") + 1);
        //3. 設定想辦法讓瀏覽器能夠支援下載我們需要的東西(Content-Disposition),中文檔名URLEncoder.encode編碼，否則有可能亂碼
        resp.setHeader("Content-Disposition","attachment;filename="
 
+ URLEncoder.encode(fileName,"UTF-8"));
        //4. 獲取下載檔案的輸入流
        FileInputStream in = new FileInputStream(realPath);
        //5. 建立緩衝區
        int len = 0;
        byte[] buffer = new byte[1024];
        //6. 獲取OutputStream物件
        ServletOutputStream out = resp.getOutputStream();
        //7. 將FileOutputStream流寫入到buffer緩衝區
 

        //8. 使用OutputStream將緩衝區中的資料輸出到客戶端！
        while ((len=in.read(buffer))>0){
            out.write(buffer,0,len);
        }
        in.close();
        out.close();
    }