关于flex 和java上传是用FileReference 时候遇到的问题

这段时间我们做文件上传，因为是用的flex 没有办法和java是用BlazeDS 进行流的通信传递信息，而且一旦文件很大我们内存就必须要足够大，

所以BlazeDS的方式我们必须要放弃的。

采用方案flex+serverlet 方式轻松进行传递。

其中遇到编码问题：

1 是用URLEncoding 解决（tomcat的类），

2 遇到flex传递过来文件连头解释内容文件都保存了，显然不行，经过查询很多资料

参见资料：http://help.adobe.com/zh_CN/FlashPlatform/reference/actionscript/3/flash/net/FileReference.html#upload

截图：

 POST /handler.cfm HTTP/1.1   Accept: text/*  Content-Type: multipart/form-data;   boundary=----------Ij5ae0ae0KM7GI3KM7   User-Agent: Shockwave Flash   Host: www.example.com   Content-Length: 421   Connection: Keep-Alive   Cache-Control: no-cache    ------------Ij5GI3GI3ei4GI3ei4KM7GI3KM7KM7  Content-Disposition: form-data; name="Filename"    MyFile.jpg  ------------Ij5GI3GI3ei4GI3ei4KM7GI3KM7KM7  Content-Disposition: form-data; name="Filedata"; filename="MyFile.jpg"  Content-Type: application/octet-stream    FileDataHere  ------------Ij5GI3GI3ei4GI3ei4KM7GI3KM7KM7  Content-Disposition: form-data; name="Upload"    Submit Query  ------------Ij5GI3GI3ei4GI3ei4KM7GI3KM7KM7--

是这种格式文件，所以必须要经过解析才能拿到文件内容，

这个也有想过自己手动写个解析类，但是分析了下这个结构，貌似不是很好解析啊，所以没有办法，但是在一分析，这个结构有点像是apache的开源上传组件的文件结构，

org.apache.commons.fileupload.servlet.ServletFileUpload  这个类，

这两个个包应该是必须的，经过测试果然能用。

C:\Users\yjy\.m2\repository\com\huadi\cscp\commons-fileupload\1.2.2\commons-fileupload-1.2.2.jar

C:\Users\yjy\.m2\repository\com\huadi\cscp\commons-io\1.4\commons-io-1.4.jar

下面是代码分享，这里的重点是servlet  之贴出servlet的代码：

package com.gzhdi.cscp.service;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.util.HashMap;import java.util.Iterator;import java.util.List;import java.util.Map;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.fileupload.DefaultFileItemFactory;import org.apache.commons.fileupload.FileItem;import org.apache.commons.fileupload.FileItemFactory;import org.apache.commons.fileupload.FileUploadException;import org.apache.commons.fileupload.servlet.ServletFileUpload;import org.apache.log4j.Logger;import com.gzhdi.cscp.api.comm.def.CDMIRequestDefine;import com.gzhdi.csmp.gate.DataOperate;@SuppressWarnings("deprecation")public class UpDownFFF extends HttpServlet{private static final long serialVersionUID = 1L;private static final Logger logger = Logger.getLogger(UpDownFFF.class);DataOperate op = new DataOperate(null, null);public static final String METHOD_POST = "POST";public static final String METHOD_GET = "GET";/** * @see HttpServlet#HttpServlet() */public UpDownFFF(){super();}/** * 这里的意思就是我帮你请求的意思，请求转发 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse *      response) */protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException{logger.info("Download START.......");String uri = request.getPathInfo();InputStream in = op.httpActionForInputStream(METHOD_GET, uri + "?"+ request.getQueryString(), false);OutputStream out = response.getOutputStream();int n = 0;byte[] b = new byte[1024];while ((n = in.read(b)) != -1){out.write(b, 0, n);}in.close();out.close();logger.info("文件下载在客户端时刻:" + System.currentTimeMillis());logger.info("Download END.......");}/*** * 设计成为 proxy 统一使用 */protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException{logger.info("Upload START.......");request.setCharacterEncoding("UTF-8");String uri = new String(request.getPathInfo().getBytes("iso8859-1"),"utf-8")+"?"+request.getQueryString();request.getParameter("Upload");InputStream in=null;try{ FileItemFactory filefactory=new DefaultFileItemFactory() ;//解析request body拿出来文件体ServletFileUpload upload = new ServletFileUpload(filefactory);@SuppressWarnings("unchecked")List<FileItem> fileItems = upload.parseRequest(request);Iterator<FileItem> iter=fileItems.iterator();FileItem fileItem=null;while(iter.hasNext()){fileItem=iter.next();if(!fileItem.isFormField()){in=fileItem.getInputStream();}}} catch (FileUploadException e){e.printStackTrace();}String re = op.proxyHttpAction(METHOD_POST, uri, in,null);OutputStream out = response.getOutputStream();out.write(re.getBytes());out.close();/////////////test//InputStream sendDataStream=request.getInputStream();//int n = 0;//int count=0;//byte[] b = new byte[1024];//while ((n = sendDataStream.read(b)) != -1)//{//count+=n;//System.out.print("recevie:"+new String(b,0,n));//}//logger.info("Upload END.......");}/** * 组装请求头 统一使用 * @param request * @author yinlei |2012-9-3 下午4:21:59 * @version 0.1 */public Map<String, String> getHeaders(HttpServletRequest request){Map<String, String> map = new HashMap<String, String>();String sign = request.getHeader(CDMIRequestDefine.HEADER_SIGN);if (sign != null){map.put(CDMIRequestDefine.QUERY_APPID, sign);}return map;}}

可以参见这个，这个兄弟写的很详细，非常感谢：http://www.blogjava.net/rainwindboys/archive/2008/09/18/229219.html