Firefox下载自动保存

　　　　profile.setPreference("browser.download.folderList", 2);
　　　　profile.setPreference("browser.download.dir", "C:\\selenium");
　　　　profile.setPreference("browser.helperApps.neverAsk.saveToDisk",
　　　　"application/octet-stream, application/vnd.ms-excel, text/csv, application/zip,application/exe");
　　　　　WebDriver driver = new FirefoxDriver(profile);

        driver = new FirefoxDriver(profile);
       driver.get("http://music.baidu.com/pc/spec/download9117/BaiduMusic-12345617.exe");

http://www.w3school.com.cn/media/media_mimeref.asp

号	内容类型	文件扩展名	描述
1	application/msword	doc	Microsoft Word
2	application/octet-stream bin	dms lha lzh exe class	可执行程序
3	application/pdf	pdf	Adobe Acrobat
4	application/postscript	ai eps ps	PostScript
5	appication/powerpoint	ppt	Microsoft Powerpoint
6	appication/rtf	rtf	rtf 格式
7	appication/x-compress	z	unix 压缩文件
8	application/x-gzip	gz	gzip
9	application/x-gtar	gtar	tar 文档 (gnu 格式 )
10	application/x-shockwave-flash	swf	MacroMedia Flash
11	application/x-tar	tar	tar(4.3BSD)
12	application/zip	zip	winzip
13	audio/basic	au snd	sun/next 声音文件
14	audio/mpeg	mpeg mp2	Mpeg 声音文件
15	audio/x-aiff	mid midi rmf	Midi 格式
16	audio/x-pn-realaudio	ram ra	Real Audio 声音
17	audio/x-pn-realaudio-plugin	rpm	Real Audio 插件
18	audio/x-wav	wav	Microsoft Windows 声音
19	image/cgm	cgm	计算机图形元文件
20	image/gif	gif	COMPUSERVE GIF 图像
21	image/jpeg	jpeg jpg jpe	JPEG 图像
22	image/png	png	PNG 图像

text/html HTML

text/plain          TXT

text/xml             XML

text/json           json字符串