用Java IO流读取本地文件，并在前端显示

@RequestMapping(value = "readImg")
    public String readImg(HttpServletRequest request,HttpServletResponse response) throws IOException {
        
        ServletOutputStream out = null;  
        FileInputStream ips = null;  
        String url = "D:/one/two.png";
        try {  
            //获取图片存放路径 
            File file = new File(url);
            if(!file.exists()) {
                return null;
            }
            
            ips = new FileInputStream(file);  
            response.setContentType("multipart/form-data");  
            out = response.getOutputStream();  
            //读取文件流  
            int len = 0;  
            byte[] buffer = new byte[1024 * 10];  
            while ((len = ips.read(buffer)) != -1){  
                out.write(buffer,0,len);  
            }  
            out.flush();  
        }catch (Exception e){  
            e.printStackTrace();  
        }finally {  
            out.close();  
            ips.close();  
        }  
        return null; 

    }

最后在图片路径中加入即可