图片上传到服务器

利用控件上传文件
起初方法：直接把文件写入数据库（Oracle）。由于Oracle字段Blob的特殊性，查阅了很多资料。Dao层的代码如下：

	public void saveByBlob (Banyan banyan,FormFile fileName) throws SQLException, IOException{
		banyan.setImage(Hibernate.createBlob(new byte [1]));
		getHibernateTemplate().save(banyan);
		getHibernateTemplate().flush();
		getHibernateTemplate().update(banyan);
		getHibernateTemplate().refresh(banyan, LockMode.UPGRADE);
 
		SerializableBlob serializableBlob = (SerializableBlob) banyan.getImage();
        java.sql.Blob javablob = serializableBlob.getWrappedBlob() ;
        oracle.sql.BLOB blob = (oracle.sql.BLOB) javablob ;
        BufferedInputStream in = new BufferedInputStream(
        		fileName.getInputStream());
        BufferedOutputStream out = new BufferedOutputStream(blob
                .getBinaryOutputStream());
        
        byte [] buffer =new byte[102400];
		int len;
		buffer =new byte[102400];
		while((len=in.read(buffer))!=-1){
			out.write(buffer,0,len);
		}
		in.close();
		out.flush();
		out.close();
	}

这样的做法是，经常会碰到死锁现象，卡在那。。。不懂是什么情况。。。

成功使用方法：把文件传到服务器，然后把该文件在服务器上的地址存到数据库。又由于利用控件来操作。SmartUpload.initialize(config, request, response);涉及到config的，试了很多办法还是不懂得怎么在action或dao层进行，所以改用在servlet。其中jsp页面里要注意的是：form标签里要增加enctype="multipart/form-data"  。

public class ServletBanyanAdd extends HttpServlet {
	private ServletConfig config;

	final public void init(ServletConfig config) throws ServletException {
		this.config = config;
	}

	protected void doGet(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub

				
		//设置图片存储命名为：urlPattern+文件名，避免重复的名字。
		String urlPattern = banyan.getBanyanId().toString()+"-";
		SmartUpload mySmartUpload = new SmartUpload();
		String fileName=null;
		try {
			mySmartUpload.initialize(config, request, response);
			mySmartUpload.upload();
			for (int i = 0; i < mySmartUpload.getFiles().getCount(); i++) {
				com.jspsmart.upload.File myfile = mySmartUpload.getFiles()
						.getFile(i);
                                                                if (StringUtil.isNotNull(myfile.getFileName())) {
					fileName = urlPattern + myfile.getFileName().toLowerCase();
					myfile.saveAs("/upload/" + fileName);
					banyan.setPicture("/bms/upload/" + fileName);
				}			}
		} catch (Exception e) {
		}
		
	}

	protected void doPost(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doGet(request, response);
	}
}

 

 判断图片格式和大小的js，页面使用方法：<html:file property="picture" onchange="return checkType('picture');"></html:file>

function checkType(fieldName)//检查图片格式以及大小的函数
{
        var string = document.all[fieldName].value;
        if(string==null||string=="")
        return true;
        else{
          string=string.toLowerCase();
          var len=string.length;
          var  suffix=string.substring(string.lastIndexOf('.'));
          //var suffix=string.substring(len-4,len);          
          if(!(suffix==".jpg"||suffix==".gif"||suffix==".png"||suffix==".bmp"))
            {
                alert("上传图片格式不对");
                //obj.focus();
                document.all[fieldName].select();
                document.execCommand('Delete');//清空上传文件空间内容
                document.all[fieldName].focus();
                return false;
            }
           var   img=new   Image();
           img.src = document.all[fieldName].value;
           if(img.fileSize/1024>1024)
            {
                alert("上传的图片超过1M");
                document.all[fieldName].select();
                document.execCommand('Delete');//清空上传文件空间内容
                document.all[fieldName].focus();
                return false;
            }

           return true;
         }
}