流的名称

字节流和字符流的区别

每次读写的字节数不同；

字符流是块读写，字节流是字节读写；

字符流带有缓存，字节流没有

java流在处理上分为字符流和字节流。字符流处理的单元为2个字节的Unicode字符，分别操作字符、字符数组或字符串，而字节流处理单元为1个字节，操作字节和字节数组。

字符流和字节流，一个属性范围小，一个属性范围大，字符流只能是字符这一种类型，但是字节流中可以是字符，可以是二进制文件，可以是音频，可以是各种各样的类型，只要符合字节形式存储的都可以接字节流，而字符流只能接字符。

字节流一般用来处理图像、视频、音频、PPT、Word等类型的文件。字符流一般用于处理纯文本类型的文件，如TXT文件等，但不能处理图像视频等非文本文件。用一句话说就是：字节流可以处理一切文件，而字符流只能处理纯文本文件。

缓冲流在代码编写的注意点

字符流BufferedReader

字节流BufferedInputStream

字节流代码编写格式

缓冲流的功能主要体现在以下两个方面：
1. 性能的提高：主要以增加缓冲的方式来提高输入输出的效率。
2. 操作的便捷：处理流可能提供了一系列便捷的方法来一次输入输出大批量的数据，使用更加灵活方便。

zip流相关

1定义循环的需要写入zip的所有文件

//定义需要插入文件的集合map key为 url：文件地址，文件名称
List<Map<String,String>> list = new ArrayList<>();

2文件的里所需要的必要参数

3创建临时文件，将之前的文件放入当中

主要用于需要确保压缩文件在压缩跟解压的无误操作，确保完全相同

4核心插入的代码

5 response.setContentType说明

response.setContentType(MIME)的作用是使客户端浏览器，区分不同种类的数据，并根据不同的MIME调用浏览器内不同的程序嵌入模块来处理相应的数据。

一般在Servlet中，习惯性的会首先设置请求以及响应的内容类型以及编码方式：
response.setContentType("text/html;charset=UTF-8");
request.setCharacterEncoding("UTF-8");

response.setContentType()的String参数及对应类型

文件扩展名   Content-Type(Mime-Type)   文件扩展名   Content-Type(Mime-Type)
.*（二进制流，不知道下载文件类型）   application/octet-stream   .tif   image/tiff
.001   application/x-001   .301   application/x-301
.323   text/h323   .906   application/x-906
.907   drawing/907   .a11   application/x-a11
.acp   audio/x-mei-aac   .ai   application/postscript
.aif   audio/aiff   .aifc   audio/aiff
.aiff   audio/aiff   .anv   application/x-anv
.asa   text/asa   .asf   video/x-ms-asf
.asp   text/asp   .asx   video/x-ms-asf
.au   audio/basic   .avi   video/avi
.awf   application/vnd.adobe.workflow   .biz   text/xml
.bmp   application/x-bmp   .bot   application/x-bot
.c4t   application/x-c4t   .c90   application/x-c90
.cal   application/x-cals   .cat   application/vnd.ms-pki.seccat
.cdf   application/x-netcdf   .cdr   application/x-cdr
.cel   application/x-cel   .cer   application/x-x509-ca-cert
.cg4   application/x-g4   .cgm   application/x-cgm
.cit   application/x-cit   .class   java/*
.cml   text/xml   .cmp   application/x-cmp
.cmx   application/x-cmx   .cot   application/x-cot
.crl   application/pkix-crl   .crt   application/x-x509-ca-cert
.csi   application/x-csi   .css   text/css
.cut   application/x-cut   .dbf   application/x-dbf
.dbm   application/x-dbm   .dbx   application/x-dbx
.dcd   text/xml   .dcx   application/x-dcx
.der   application/x-x509-ca-cert   .dgn   application/x-dgn
.dib   application/x-dib   .dll   application/x-msdownload
.doc   application/msword   .dot   application/msword
.drw   application/x-drw   .dtd   text/xml
.dwf   Model/vnd.dwf   .dwf   application/x-dwf
.dwg   application/x-dwg   .dxb   application/x-dxb
.dxf   application/x-dxf   .edn   application/vnd.adobe.edn
.emf   application/x-emf   .eml   message/rfc822
.ent   text/xml   .epi   application/x-epi
.eps   application/x-ps   .eps   application/postscript
.etd   application/x-ebx   .exe   application/x-msdownload
.fax   image/fax   .fdf   application/vnd.fdf
.fif   application/fractals   .fo   text/xml
.frm   application/x-frm   .g4   application/x-g4
.gbr   application/x-gbr   .   application/x-
.gif   image/gif   .gl2   application/x-gl2
.gp4   application/x-gp4   .hgl   application/x-hgl
.hmr   application/x-hmr   .hpg   application/x-hpgl
.hpl   application/x-hpl   .hqx   application/mac-binhex40
.hrf   application/x-hrf   .hta   application/hta
.htc   text/x-component   .htm   text/html
.html   text/html   .htt   text/webviewhtml
.htx   text/html   .icb   application/x-icb
.ico   image/x-icon   .ico   application/x-ico
.iff   application/x-iff   .ig4   application/x-g4
.igs   application/x-igs   .iii   application/x-iphone
.img   application/x-img   .ins   application/x-internet-signup
.isp   application/x-internet-signup   .IVF   video/x-ivf
.java   java/*   .jfif   image/jpeg
.jpe   image/jpeg   .jpe   application/x-jpe
.jpeg   image/jpeg   .jpg   image/jpeg
.jpg   application/x-jpg   .js   application/x-javascript
.jsp   text/html   .la1   audio/x-liquid-file
.lar   application/x-laplayer-reg   .latex   application/x-latex
.lavs   audio/x-liquid-secure   .lbm   application/x-lbm
.lmsff   audio/x-la-lms   .ls   application/x-javascript
.ltr   application/x-ltr   .m1v   video/x-mpeg
.m2v   video/x-mpeg   .m3u   audio/mpegurl
.m4e   video/mpeg4   .mac   application/x-mac
.man   application/x-troff-man   .math   text/xml
.mdb   application/msaccess   .mdb   application/x-mdb
.mfp   application/x-shockwave-flash   .mht   message/rfc822
.mhtml   message/rfc822   .mi   application/x-mi
.mid   audio/mid   .midi   audio/mid
.mil   application/x-mil   .mml   text/xml
.mnd   audio/x-musicnet-download   .mns   audio/x-musicnet-stream
.mocha   application/x-javascript   .movie   video/x-sgi-movie
.mp1   audio/mp1   .mp2   audio/mp2
.mp2v   video/mpeg   .mp3   audio/mp3
.mp4   video/mpeg4   .mpa   video/x-mpg
.mpd   application/vnd.ms-project   .mpe   video/x-mpeg
.mpeg   video/mpg   .mpg   video/mpg
.mpga   audio/rn-mpeg   .mpp   application/vnd.ms-project
.mps   video/x-mpeg   .mpt   application/vnd.ms-project
.mpv   video/mpg   .mpv2   video/mpeg
.mpw   application/vnd.ms-project   .mpx   application/vnd.ms-project
.mtx   text/xml   .mxp   application/x-mmxp
.net   image/pnetvue   .nrf   application/x-nrf
.nws   message/rfc822   .odc   text/x-ms-odc
.out   application/x-out   .p10   application/pkcs10
.p12   application/x-pkcs12   .p7b   application/x-pkcs7-certificates
.p7c   application/pkcs7-mime   .p7m   application/pkcs7-mime
.p7r   application/x-pkcs7-certreqresp   .p7s   application/pkcs7-signature
.pc5   application/x-pc5   .pci   application/x-pci
.pcl   application/x-pcl   .pcx   application/x-pcx
.pdf   application/pdf   .pdf   application/pdf
.pdx   application/vnd.adobe.pdx   .pfx   application/x-pkcs12
.pgl   application/x-pgl   .pic   application/x-pic
.pko   application/vnd.ms-pki.pko   .pl   application/x-perl
.plg   text/html   .pls   audio/scpls
.plt   application/x-plt   .png   image/png
.png   application/x-png   .pot   application/vnd.ms-powerpoint
.ppa   application/vnd.ms-powerpoint   .ppm   application/x-ppm
.pps   application/vnd.ms-powerpoint   .ppt   application/vnd.ms-powerpoint
.ppt   application/x-ppt   .pr   application/x-pr
.prf   application/pics-rules   .prn   application/x-prn
.prt   application/x-prt   .ps   application/x-ps
.ps   application/postscript   .ptn   application/x-ptn
.pwz   application/vnd.ms-powerpoint   .r3t   text/vnd.rn-realtext3d
.ra   audio/vnd.rn-realaudio   .ram   audio/x-pn-realaudio
.ras   application/x-ras   .rat   application/rat-file
.rdf   text/xml   .rec   application/vnd.rn-recording
.red   application/x-red   .rgb   application/x-rgb
.rjs   application/vnd.rn-realsystem-rjs   .rjt   application/vnd.rn-realsystem-rjt
.rlc   application/x-rlc   .rle   application/x-rle
.rm   application/vnd.rn-realmedia   .rmf   application/vnd.adobe.rmf
.rmi   audio/mid   .rmj   application/vnd.rn-realsystem-rmj
.rmm   audio/x-pn-realaudio   .rmp   application/vnd.rn-rn_music_package
.rms   application/vnd.rn-realmedia-secure   .rmvb   application/vnd.rn-realmedia-vbr
.rmx   application/vnd.rn-realsystem-rmx   .rnx   application/vnd.rn-realplayer
.rp   image/vnd.rn-realpix   .rpm   audio/x-pn-realaudio-plugin
.rsml   application/vnd.rn-rsml   .rt   text/vnd.rn-realtext
.rtf   application/msword   .rtf   application/x-rtf
.rv   video/vnd.rn-realvideo   .sam   application/x-sam
.sat   application/x-sat   .sdp   application/sdp
.sdw   application/x-sdw   .sit   application/x-stuffit
.slb   application/x-slb   .sld   application/x-sld
.slk   drawing/x-slk   .smi   application/smil
.smil   application/smil   .smk   application/x-smk
.snd   audio/basic   .sol   text/plain
.sor   text/plain   .spc   application/x-pkcs7-certificates
.spl   application/futuresplash   .spp   text/xml
.ssm   application/streamingmedia   .sst   application/vnd.ms-pki.certstore
.stl   application/vnd.ms-pki.stl   .stm   text/html
.sty   application/x-sty   .svg   text/xml
.swf   application/x-shockwave-flash   .tdf   application/x-tdf
.tg4   application/x-tg4   .tga   application/x-tga
.tif   image/tiff   .tif   application/x-tif
.tiff   image/tiff   .tld   text/xml
.top   drawing/x-top   .torrent   application/x-bittorrent
.tsd   text/xml   .txt   text/plain
.uin   application/x-icq   .uls   text/iuls
.vcf   text/x-vcard   .vda   application/x-vda
.vdx   application/vnd.visio   .vml   text/xml
.vpg   application/x-vpeg005   .vsd   application/vnd.visio
.vsd   application/x-vsd   .vss   application/vnd.visio
.vst   application/vnd.visio   .vst   application/x-vst
.vsw   application/vnd.visio   .vsx   application/vnd.visio
.vtx   application/vnd.visio   .vxml   text/xml
.wav   audio/wav   .wax   audio/x-ms-wax
.wb1   application/x-wb1   .wb2   application/x-wb2
.wb3   application/x-wb3   .wbmp   image/vnd.wap.wbmp
.wiz   application/msword   .wk3   application/x-wk3
.wk4   application/x-wk4   .wkq   application/x-wkq
.wks   application/x-wks   .wm   video/x-ms-wm
.wma   audio/x-ms-wma   .wmd   application/x-ms-wmd
.wmf   application/x-wmf   .wml   text/vnd.wap.wml
.wmv   video/x-ms-wmv   .wmx   video/x-ms-wmx
.wmz   application/x-ms-wmz   .wp6   application/x-wp6
.wpd   application/x-wpd   .wpg   application/x-wpg
.wpl   application/vnd.ms-wpl   .wq1   application/x-wq1
.wr1   application/x-wr1   .wri   application/x-wri
.wrk   application/x-wrk   .ws   application/x-ws
.ws2   application/x-ws   .wsc   text/scriptlet
.wsdl   text/xml   .wvx   video/x-ms-wvx
.xdp   application/vnd.adobe.xdp   .xdr   text/xml
.xfd   application/vnd.adobe.xfd   .xfdf   application/vnd.adobe.xfdf
.xhtml   text/html   .xls   application/vnd.ms-excel
.xls   application/x-xls   .xlw   application/x-xlw
.xml   text/xml   .xpl   audio/scpls
.xq   text/xml   .xql   text/xml
.xquery   text/xml   .xsd   text/xml
.xsl   text/xml   .xslt   text/xml
.xwd   application/x-xwd   .x_b   application/x-x_b
.sis   application/vnd.symbian.install   .sisx   application/vnd.symbian.install
.x_t   application/x-x_t   .ipa   application/vnd.iphone
.apk   application/vnd.android.package-archive   .xap   application/x-silverlight-app