java下载文件在各个浏览器差异 以及中文乱码解决

 这阶段在项目中 用到java下载

 自认为很简单的问题， 当时也确实很快完成的了， 主要是在IE下面测试的

但是后来QA 在Firefox 、Opera ,Chrome , safari下面测试才发现，问题多多

不是乱码问题， 就是在下载文件的后缀名字被莫名其妙的修改了(如：.htm)

然后又跑safari 和 opera 各个论坛查找牛人资料， 然后整理出基本代码了，

记录下来了 ，作为读书笔记吧， 说不定那天就用上来了，

现在忘记东西的速度快赶上鱼的记忆了( 传说中鱼的记忆只有七秒)

public String exportCode() throws Exception{req = ServletActionContext.getRequest();res = ServletActionContext.getResponse();res.reset();String eng = req.getHeader("USER-AGENT");res.setCharacterEncoding("UTF-8");if(eng.lastIndexOf("Opera") > -1) {res.setContentType("application/x-act-msdownload;charset=UTF-8");        }else {        res.setContentType("text/html;charset=UTF-8");        }String id = req.getParameter("id");if(id == null || "".equals(id)) {return null;}String sql = "select a.companyname,a.code,b.email,b.address,b.tel,b.remark from codeinfo a ";String where = "left join userinfo b on b.companyname=a.companyname and b.parentid=a.userid where a.id='"+id+"'";List list=null;try {list = codeinfoDao.executeSQL(sql, where, 0, 0);} catch (Exception e1) {}Object[] obj = null;if(list!=null && list.size()>0) {obj = (Object[])list.get(0);}String toSrc = ServletActionContext.getServletContext().getRealPath("code")+"/";String newFileName = obj[0]+".act";File toFile = new File(toSrc+newFileName);StringBuffer sb = new StringBuffer("<?xml version='1.0' encoding='UTF-8'?>\n <activeInfo>\n");if(obj.length>0) {sb.append(" <registKey>").append(obj[1]).append("</registKey>\n<registInfo>\n");sb.append("    <userName>").append(obj[0].toString()).append("</userName>\n");sb.append("    <email>").append(obj[2]).append("</email>\n");sb.append("    <phone>").append(obj[4]).append("</phone>\n");sb.append("    <address>").append(obj[3]).append("</address>\n");sb.append("    <comment>").append(obj[5]).append("</comment>\n");}sb.append("</registInfo>\n</activeInfo>");BufferedInputStream bis = null;        BufferedOutputStream bos = null;        OutputStream fos = null;        InputStream fis = null;       try {   BufferedWriter output = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(toFile), "UTF-8"));   output.write('\ufeff');     output.write(sb.toString());   output.close();       fis = new FileInputStream(toFile);bis = new BufferedInputStream(fis);fos = res.getOutputStream();bos = new BufferedOutputStream(fos);        String fileName=res.encodeURL(new String(newFileName.getBytes(),"ISO8859_1"));        if(eng.lastIndexOf("Safari") > -1 && eng.lastIndexOf("Chrome") > -1) {        fileName=java.net.URLEncoder.encode(newFileName, "UTF-8");        }else if(eng.lastIndexOf("Safari") > -1 && eng.lastIndexOf("Chrome") == -1) {        fileName = new String(newFileName.getBytes("UTF-8"),"ISO8859-1");        }               res.setHeader("Content-disposition",                   "attachment;filename=\""+fileName+"\"");int bytesRead = 0;  byte[] buffer = new byte[8192];while ((bytesRead = bis.read(buffer, 0, 8192)) != -1) {    bos.write(buffer, 0, bytesRead);}      } catch (IOException e) {e.printStackTrace();}try {bos.flush();fis.close();bis.close();fos.close();bos.close();} catch (IOException e) {e.printStackTrace();}return null;}