之前用flash.display.Loader，不支持bmp文件的预览。现在修改服务器java的代码，flex通过请求html来预览pdf以及所有图片格式
注意：因为是预览不是在线，所有Content-Disposition要设置成inline，不要设置成附件attachment
客户端flex的设置
var parm:Object = _showFileItem.getPostParam(false);
?????var showPicURL:URLRequest = new URLRequest();
?????var postData:URLVariables = new URLVariables();??
?????postData.serverFileName = _showFileItem.serverFileName;
?????postData.serverFilePath = _showFileItem.serverFilePath;
?????showPicURL.data = postData;
?????showPicURL.url = parm["showPicUrl"];??//请求后天的服务 路径比如是http://192.168.1.100:8080/ZFS/showPicture.do
?????var filetype:String = _showFileItem.serverFileName.toString();
?????var fileFilt:String =filetype.substring(filetype.lastIndexOf(".")+1,filetype.length);
?????if(fileFilt=="pdf"||fileFilt=="gif" || fileFilt=="jpg" || fileFilt=="bmp" || fileFilt=="png"){
??????showPicURL.method=URLRequestMethod.POST;
??????navigateToURL(showPicURL,"_blank");
?????}else{
??????Alert.show("只支持图片格式！","提示");
?????}
服务器java代码如下：
package com.zhan.fileupload;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ShowFile extends HttpServlet{
?/**
? *
? */
?private static final long serialVersionUID = 3089316329737765177L;
?public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException{
??doPost(request,response);
?}
?
?public void doPost(HttpServletRequest request,HttpServletResponse response) throws IOException{
??try {
???downLoad(request,response);
??} catch (Exception e) {
???// TODO Auto-generated catch block
???e.printStackTrace();
??}
?}
?
?private void downLoad(HttpServletRequest request,HttpServletResponse response) throws Exception {
//??BufferedOutputStream bos = null;
//??BufferedInputStream? bis = null;
??
??String serverFilePath = request.getParameter("serverFilePath");
??if(serverFilePath!=null)
???serverFilePath = new String(serverFilePath.getBytes("ISO8859-1"),"utf-8");
??
??String serverFileName = request.getParameter("serverFileName");
??if(serverFileName!=null)
???serverFileName = new String(serverFileName.getBytes("ISO8859-1"),"utf-8");
??
??System.out.print(serverFilePath+serverFileName);
???
??String fileName = serverFilePath + serverFileName;
??
??BufferedInputStream br = null;
??OutputStream out = null;
??
??//查看文档
??try{
???File f = new File(fileName);
???System.out.println(f.getName());
???if(!f.exists()){
????response.sendError(404,"File not found!");
????return;
???}
???br = new BufferedInputStream(new FileInputStream(f));
???byte[] buf = new byte[1024];
???int len = 0;
???response.reset(); //非常重要
???
???//文 件类型
???if(serverFileName.toUpperCase().lastIndexOf(".pdf".toUpperCase())!=-1){
????
????response.setContentType("application/pdf");
???}
???else if(serverFileName.toUpperCase().lastIndexOf(".doc".toUpperCase())!=-1
?????||
?????serverFileName.toUpperCase().lastIndexOf(".docx".toUpperCase())!=-1){
????response.setContentType("application/msword");
???}
???else if(serverFileName.toUpperCase().lastIndexOf(".xls".toUpperCase())!=-1){
????response.setContentType("application/vnd.ms-excel");
????
???}else if(serverFileName.toUpperCase().lastIndexOf(".ppt".toUpperCase())!=-1){
????response.setContentType("application/vnd.ms-powerpoint");
????
???}else if(serverFileName.toUpperCase().lastIndexOf(".jpg".toUpperCase())!=-1
?????){
????
????response.setContentType("image/jpg;");
???}
???else if(
?????serverFileName.toUpperCase().lastIndexOf(".png".toUpperCase())!=-1
?????){
????
????response.setContentType("image/png;");
???}
???else if(
?????serverFileName.toUpperCase().lastIndexOf(".gif".toUpperCase())!=-1
?????){
????
????response.setContentType("image/gif;");
???}
???else if(
?????
?????serverFileName.toUpperCase().lastIndexOf(".bmp".toUpperCase())!=-1){
????
????response.setContentType("image/bmp;");
???}
???
???response.setHeader("Content-Disposition","inline;? filename=" + new String(f.getName().getBytes("GBK"),"ISO8859-1"));
???response.setHeader("Pragma","No-cache");
???response.setHeader("Cache-Control","No-cache");
???response.setDateHeader("Expires",0);
???out = response.getOutputStream();
???while((len = br.read(buf)) >0){
????out.write(buf,len);
???}
???out.flush();
???
??}catch(Exception e){
???e.printStackTrace();
??}finally{
???if(br!=null){??
????br.close();
???}
???if(out!=null){
????out.close();
???}??
??}?}
}
补充以前的实现方案：
之前的通过服务器返回字节流，flex的调用Image显示，下面是部分代码
?
private var stream:URLStream = new URLStream();
???private var bytes:ByteArray = new ByteArray();
var showPicURL:URLRequest = new URLRequest();
?????var postData:URLVariables = new URLVariables();??
?????postData.serverFileName = fileItem.serverFileName;
?????postData.serverFilePath = fileItem.serverFilePath;
?????showPicURL.data = postData;
?????showPicURL.url = parm["showPicUrl"];?? //请求后天的服务 路径比如是http://192.168.1.100:8080/ZFS/showPicture.do
stream.addEventListener(Event.COMPLETE,onLoadComplete);
??????stream.load(showPicURL);
private function onLoadComplete(event:Event):void
???{
????if (stream.connected)
????{
?????var b:int;
?????try {
??????do {
???????b = stream.readByte();
???????bytes.writeByte(b);
??????} while (true);
?????} catch (e:EOFError) {
??????//Alert.show(bytes.length.toString());
?????}
????}
????var loaderPic:Loader = new Loader();//Loader 类可用于加载 SWF 文件或图像（JPG、PNG 或 GIF）文件
????loaderPic.loadBytes(bytes);
????showImage.addChild(loaderPic);???//showImage是flex的Image组件id
???}
?
后台java文件是：
package com.zhan.fileupload;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.IOException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ShowPic extends HttpServlet {
?/**
? *
? */
?private static final long serialVersionUID = 3089316329737765177L;
?public void doGet(HttpServletRequest request,HttpServletResponse response) throws Exception {
??BufferedOutputStream bos = null;
??BufferedInputStream? bis = null;
??
??String serverFilePath = request.getParameter("serverFilePath");
??if(serverFilePath!=null)
???serverFilePath = new String(serverFilePath.getBytes("ISO8859-1"),"utf-8");
??
??System.out.print(serverFilePath+serverFileName);
??
??String PicObject = serverFilePath + serverFileName;
??try {
??????????? bis = new BufferedInputStream(new FileInputStream(PicObject));??????? ?
??????????? bos = new BufferedOutputStream(response.getOutputStream());
???????????
??????????? byte[] buff = new byte[2048];
??????????? int bytesRead;
??????????? while(-1 != (bytesRead = bis.read(buff,buff.length))) { ??????????????? bos.write(buff,bytesRead); ??????????? } ??????? } catch(final IOException e) { ??????? ?e.printStackTrace(); ??????? } catch(Exception e) { ??????? ?e.printStackTrace(); ??????? }finally { ??????????? if (bis != null) ??????????????? bis.close(); ??????????? if (bos != null) ??????????? { ??????????????? bos.flush(); ??????????????? bos.close(); ??????????????? bos=null; ??????????? } ??????? } ??????? response.flushBuffer(); ?} }
