java上传不同类型图片,保存数据库(Base64位图转网络图片)

String imgBase64 = request.getParameter("userImgbase64");
// 获取当前服务器路径
 String realPath = request.getServletContext().getRealPath("")+"\\img"; 
System.out.println(realPath );   //　　http://192.168.191.1:8080/MyWeb/img

String[] imgType = imgBase64.split(",");

// 获取图片类型(如果没有类型,貌似会报错)
String imgTypes = imgType[0].toString().substring(11, imgType[0].toString().length()-7);

String userImgbase64 = GenerateImage(imgBase64,realPath,imgTypes);

System.out.println(realPath );   //　　http://192.168.191.1:8080/MyWeb/img/1532493648717.png

//对字节数组字符串进行Base64解码并生成图片
     public static String GenerateImage(String base64Img,String realPath,String imgTypes ){  
         String ret_fileName = null;
         // 临时文件路径              
         File file_normer = new File(realPath+"/");  
         if (!file_normer.exists()) {  
             file_normer.mkdirs();  
         }  
          if (base64Img == null) // 图像数据为空    
                 return "图像数据为空";    
          base64Img = base64Img.replaceAll("data:image/"+imgTypes+";base64,", "");    
             BASE64Decoder decoder = new BASE64Decoder();    
             try {    
                 // Base64解码    
                 byte[] b = decoder.decodeBuffer(base64Img);    
                 for (int i = 0; i < b.length; ++i) {    
                     if (b[i] < 0) {// 调整异常数据    
                         b[i] += 256;    
                     }    
                 }    
                 // 生成jpeg图片       
                 ret_fileName = System.currentTimeMillis()+"."+imgTypes+"";
                 File file = new File(realPath + "/" + ret_fileName );  
                 OutputStream out = new FileOutputStream(file);    
                 out.write(b);    
                 out.flush();    
                 out.close();    
             } catch (Exception e) {    
                 e.printStackTrace();    
             }    
             return ret_fileName ;   
            
        }