data/attach/1904/lsk6e667g97j7q6ptqv2kwexbhsr2zcg.jpg 查阅时在网上发现的，觉得不错，转过来让自己以后有需要可以看看  顺便附上我自己的jsp页面代码 public static void showPic(String pic,HttpServletResponse response) {
    try{
         InputStream inputStream = null;
         ServletOutputStream outputStream=response.getOutputStream();
         response.reset();
         response.setContentType("image/jpeg");   
         String savePath = "";
         // 系统文件路径
         String globalPath = FileUploadContext.getGlobalPath();
         if (globalPath == null) {              globalPath = "D://software//";
         }     
         savePath = globalPath+pic;          try {
             inputStream = new FileInputStream(savePath);              int bufferSize = 4096;
             byte[] b = new byte[bufferSize];
             int n = 0;              do {
                 n = inputStream.read(b);                  if (n > 0) {
                     outputStream.write(b, 0, n);
                 }
             } while (n > 0);              outputStream.flush();
         } finally {
             if (inputStream != null) {
                 inputStream.close();
             }
             if (outputStream != null) {
                 outputStream.close();
             }
         }
    }catch(IOException e){
        logger.error(e.getMessage());
    }
    } public static String uploadPic(HttpServletRequest req , String errorPic){          
        MultipartFile file = ((DefaultMultipartHttpServletRequest) req).getFile("pic");
        String fileName = errorPic;
        if(file!=null && file.getSize() > 0){
            try{
                
                if(file.getSize()>10000000){    
                    throw new BaseException("上传失败:文件大小不能超过10M"); 
                }
                
                String picPath = FileUploadContext.getGlobalPath();                 fileName = FileUploadContext.nextFileName();
                int point = fileName.lastIndexOf(".");
                fileName = fileName.substring(0,point);
                
                String realFileName = file.getOriginalFilename();
                int len = realFileName.length();
                point = realFileName.lastIndexOf(".");
                String prefix = realFileName.substring(point,len);
                
                if(prefix.equals("")){    
                    throw new IllegalArgumentException("文件无扩展名！"); 
                }else if (prefix.equalsIgnoreCase(".jpg") 
                        || prefix.equalsIgnoreCase(".gif") 
                        || prefix.equalsIgnoreCase(".bmp")) {
                    // system.out.println("upload file type is " + prefix);
                    fileName = fileName + prefix ;
                } else {
                    throw new IllegalArgumentException("文件类型错误！");
                }
                
                String fileFullName = picPath + fileName;
                File destFile = new File(fileFullName);
                file.transferTo(destFile);
                
            }catch(Exception e){
                logger.error(e.getMessage()); 
                return fileName;
            }
        }
        return fileName;
    }




       
       
       
       
       
       
     

${st.mark}

方式2:将图片存入数据库blob字段中(如表数据量较大不推荐使用) public static byte[] savePic(ServletContext context, String fileName) {
        
        byte[] buf = null;//10k缓存
        try{ 
             String picPath = context.getRealPath("WEB-INF");
             int point = picPath.lastIndexOf(File.separator);
             picPath = picPath.substring(0,point);
             
             picPath = picPath + fileName;
             
             FileInputStream imgis = new FileInputStream(picPath);
             int n = 0;
             
             ByteArrayOutputStream out = new ByteArrayOutputStream(4096);     
             byte[] b = new byte[4096];
             
             try {
                 while ((n = imgis.read(b)) != -1) { 
                     out.write(b, 0, n); 
                 }
             } finally {
                 if (imgis != null) {
                     imgis.close();
                 }
             }
             buf = out.toByteArray(); 
        }catch(IOException e){
            logger.error(e.getMessage());
        }
        
        return buf;
    } public static void showPic(HttpServletResponse response,byte[] b) {
        try{
             ServletOutputStream outputStream=response.getOutputStream();
             response.reset();
             response.setContentType("image/jpeg");   
    
             try {
                 outputStream.write(b, 0, b.length);
                 outputStream.flush();
             } finally {
                 if (outputStream != null) {
                     outputStream.close();
                 }
             }
        }catch(IOException e){
            logger.error(e.getMessage());
        }
    }