J2EE中用户上传文件到服务器功能实现？？？

Question

@jeffsui 你好，想跟你请教个问题：

大婶（错了应该是大神。。。）

我现在把网站的下载功能做好了；不过下面做的是让用户把写好的文档传到服务器上，我们这边可以下载到本地。。。应该是用叫什么getpath();

具体框架代码怎么写啊？

求大婶指点迷津！！！回头咱们加好友一起研究各自困惑的问题

Answer 1

谢谢大哥！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！！

Answer 2

http://www.oschina.net/code/search?q=%E4%B8%8A%E4%BC%A0

这里有很多代码示例

Answer 3

osc上的资源很多的，要善于利用，呵呵

Answer 4

谢谢，我还是个小小的菜鸟以后咱们常沟通。。。

Answer 5

大家都是从小小鸟过来的

Answer 6

呵呵就是

Answer 7

回复
最佳答案喽~

Answer 8

回复
老大，有没有在JSP页面上直接实现的代码啊？？？

Answer 9

附一段 commons-fileupload上传组件的servlet实现代码

public class FileUploadServlet extends AbstractItemServlet {
		
	private File uploadPath;
	
	private File tempPath;
	
	public void doPost(HttpServletRequest req, HttpServletResponse res)
			throws ServletException, IOException {
		//form提交采用multipart/form-data,无法采用req.getParameter()取得数据
		//String itemNo = req.getParameter("itemNo");
		//System.out.println("itemNo======" + itemNo);
		DiskFileItemFactory factory = new DiskFileItemFactory();
		// maximum size that will be stored in memory
		factory.setSizeThreshold(4096);
		// the location for saving data that is larger than getSizeThreshold()
		factory.setRepository(tempPath);

		ServletFileUpload upload = new ServletFileUpload(factory);
		// maximum size before a FileUploadException will be thrown
		upload.setSizeMax(1000000 * 20);
		try {
			List fileItems = upload.parseRequest(req);
			String itemNo = "";
			for (Iterator iter = fileItems.iterator(); iter.hasNext();) {
				FileItem item = (FileItem) iter.next();
				
				//是普通的表单输入域
				if(item.isFormField()) {
					if ("itemNo".equals(item.getFieldName())) {
						itemNo = item.getString();
					}
				}
				//是否为input="type"输入域
				if (!item.isFormField()) {
					String fileName = item.getName();
					long size = item.getSize();
					if ((fileName == null || fileName.equals("")) && size == 0) {
						continue;
					}
					//截取字符串 如：C:WINDOWSDebugPASSWD.LOG
					fileName = fileName.substring(fileName.lastIndexOf("\") + 1, fileName.length());
					item.write(new File(uploadPath, fileName));
					itemManager.uploadItemImage(itemNo, fileName);
				}
			}
			res.sendRedirect(req.getContextPath() + "/servlet/item/SearchItemServlet");
		} catch (Exception e) {
			e.printStackTrace();
			throw new ApplicationException("上传失败！");
		}
	}

	public void init() throws ServletException {
		uploadPath = new File(getServletContext().getRealPath("upload"));
		System.out.println("uploadPath=====" + uploadPath);
		//如果目录不存在
		if (!uploadPath.exists()) {
			//创建目录
			uploadPath.mkdir();
		}
		
		//临时目录
		tempPath = new File(getServletContext().getRealPath("temp"));
		if (!tempPath.exists()) {
			tempPath.mkdir();
		}
		//显示调用父类的init方法
		super.init();
	}
}

 

Answer 10

请问您有差不多的框架代码吗？小弟参考一下，真的没思路啊大哥

Answer 11

首先我不是大神,我只是个普通搞It的。

文件上传有很多实现。

1.commons-fileUpload框架

2.cos 开源中国用的就是这个组件

3.http

当然还有其他方式,你可以自己选择！

Answer 12

大哥谢谢。我好好看看，有什么问题咱们再沟通，，，

Answer 13

http://www.oschina.net/search?q=%E4%B8%8A%E4%BC%A0&scope=project

这里有很多上传组件，参考一下吧

Answer 14

大哥问一下我改了一下JSP页面的代码，基本的模块出来了，请问一下文件上传到服务器放在哪啊？然后我们主服务器这可以下载

Answer 15

回复
源码里面不是有路径么？路径你自己选择吧。你运行一下代码就晓得了！

Answer 16

回复
谢谢大哥

Answer 17

附一段 commons-fileupload上传组件的servlet实现代码

public class FileUploadServlet extends AbstractItemServlet {
		
	private File uploadPath;
	
	private File tempPath;
	
	public void doPost(HttpServletRequest req, HttpServletResponse res)
			throws ServletException, IOException {
		//form提交采用multipart/form-data,无法采用req.getParameter()取得数据
		//String itemNo = req.getParameter("itemNo");
		//System.out.println("itemNo======" + itemNo);
		DiskFileItemFactory factory = new DiskFileItemFactory();
		// maximum size that will be stored in memory
		factory.setSizeThreshold(4096);
		// the location for saving data that is larger than getSizeThreshold()
		factory.setRepository(tempPath);

		ServletFileUpload upload = new ServletFileUpload(factory);
		// maximum size before a FileUploadException will be thrown
		upload.setSizeMax(1000000 * 20);
		try {
			List fileItems = upload.parseRequest(req);
			String itemNo = "";
			for (Iterator iter = fileItems.iterator(); iter.hasNext();) {
				FileItem item = (FileItem) iter.next();
				
				//是普通的表单输入域
				if(item.isFormField()) {
					if ("itemNo".equals(item.getFieldName())) {
						itemNo = item.getString();
					}
				}
				//是否为input="type"输入域
				if (!item.isFormField()) {
					String fileName = item.getName();
					long size = item.getSize();
					if ((fileName == null || fileName.equals("")) && size == 0) {
						continue;
					}
					//截取字符串 如：C:WINDOWSDebugPASSWD.LOG
					fileName = fileName.substring(fileName.lastIndexOf("\") + 1, fileName.length());
					item.write(new File(uploadPath, fileName));
					itemManager.uploadItemImage(itemNo, fileName);
				}
			}
			res.sendRedirect(req.getContextPath() + "/servlet/item/SearchItemServlet");
		} catch (Exception e) {
			e.printStackTrace();
			throw new ApplicationException("上传失败！");
		}
	}

	public void init() throws ServletException {
		uploadPath = new File(getServletContext().getRealPath("upload"));
		System.out.println("uploadPath=====" + uploadPath);
		//如果目录不存在
		if (!uploadPath.exists()) {
			//创建目录
			uploadPath.mkdir();
		}
		
		//临时目录
		tempPath = new File(getServletContext().getRealPath("temp"));
		if (!tempPath.exists()) {
			tempPath.mkdir();
		}
		//显示调用父类的init方法
		super.init();
	}
}