我看到的manifest文件，如下，这是从chinajavaworld下载的，如果你是本文的作者，请和我联系：nobody_am@163.com，我想向你请教一下。Main-Class: mailbox
Main-Class: mailbox
Class-Path: SimpleMailBox.jar

Name: META-INF/javamail.default.providers
Digest-Algorithms: SHA MD5 
SHA-Digest: 0/XkyII703L8sh8KjodiRPIdSVA=
MD5-Digest: hHEgWSxi02sSk5uns8/haw==

Name: META-INF/javamail.default.address.map
Digest-Algorithms: SHA MD5 
SHA-Digest: ODAfS34uRuTBdYzYKPBp+1eqEZk=
MD5-Digest: ++MWwAqT6C0WoE+jDvLhCA==

Name: META-INF/javamail.charset.map
Digest-Algorithms: SHA MD5 
SHA-Digest: a297rNaphdN9awGOyc2R5mGUtVc=
MD5-Digest: HvDsbuHDIdUAIFyAZQKY3A==

Name: META-INF/mailcap
Digest-Algorithms: SHA MD5 
SHA-Digest: CLWFZsHqGjAyruExp9l2SE1W470=
MD5-Digest: /occG/CgZOmW7/OMyIeVaw==

Name: javax/mail/Address.class
Digest-Algorithms: SHA MD5 
SHA-Digest: AjR7RqnN//cdYGouxbd06mSVfI4=
MD5-Digest: ZnTIQ2aQAtSNIOWXI1pQpw==

Name: javax/mail/AuthenticationFailedException.class
Digest-Algorithms: SHA MD5 
SHA-Digest: YF38PrbkcI7HYJYIttTVoJV2vE4=
MD5-Digest: 8Iqc9Vl2ydMjyFKjTXyS4Q==

Name: javax/mail/Authenticator.class
Digest-Algorithms: SHA MD5 
SHA-Digest: 7pQcZt78EQHeDlSkDZzjoGLUscg=
MD5-Digest: GFAHvceOxejRDpNFl8dTSA==

Name: javax/mail/BodyPart.class
Digest-Algorithms: SHA MD5 
SHA-Digest: Z7HxV6zlgSjnoF0gZFK1/rg/oYg=
MD5-Digest: ldDtHVGoHKVflzQAxmNhCg==

Name: javax/mail/FetchProfile.class
Digest-Algorithms: SHA MD5 
SHA-Digest: PGpnHrE17bny56GbZM2pNgxjL6E=
MD5-Digest: Nz33KAF/oZE4DXT26X4nFQ==

Name: javax/mail/FetchProfile$Item.class
Digest-Algorithms: SHA MD5 
SHA-Digest: 2KIC/t+DxYO9frsMltQPlKsFtOI=
MD5-Digest: dzzNSgkHEle+kbbZ+L+JHA==

Name: javax/mail/Flags.class
Digest-Algorithms: SHA MD5 
SHA-Digest: cFkFTnS/uRD8uQaEE2S1YhbICig=
MD5-Digest: oK2yXR3PGSfixH8ZJt5L7g==

Name: javax/mail/Flags$Flag.class
Digest-Algorithms: SHA MD5 
SHA-Digest: Fk/EDANP5be/xdYYc8NcW2aNljI=
MD5-Digest: zw2CZgqIGk9f+p+GJe40Qw==

Name: javax/mail/Folder.class
Digest-Algorithms: SHA MD5 
SHA-Digest: KHtU/mLUYR2CuNJpFuMD7fsCxh4=
MD5-Digest: jSb3CLSDk1ElY6QDNfJKlg==

Name: javax/mail/Folder$1.class
Digest-Algorithms: SHA MD5 
SHA-Digest: Dvizbo9aRUW+GQuiuF7o76fV74E=
MD5-Digest: VYo4ezl+v+t4kVSYzQZCHQ==

Name: javax/mail/FolderClosedException.class
Digest-Algorithms: SHA MD5 
SHA-Digest: e0bN83KGP/c8FKy+RU7UzwZhG2Y=
MD5-Digest: S66Fif+dWjz8dTC4mpuXpQ==

Name: javax/mail/FolderNotFoundException.class
Digest-Algorithms: SHA MD5 
SHA-Digest: O0TsgREt68xLBQav6Qm383mdgwY=
MD5-Digest: IeST64ZvLCHKhAEmm56N3g==

Name: javax/mail/UIDFolder.class
Digest-Algorithms: SHA MD5 
SHA-Digest: qDcdba2rD5hvk4Quzsc3l/5nCYc=
MD5-Digest: f/ZEC8C6tfIHO/GukXcBAA==

Name: javax/mail/UIDFolder$FetchProfileItem.class
Digest-Algorithms: SHA MD5 
SHA-Digest: mc7hlMEC7Ik0finJJfh67fNw3P4=
MD5-Digest: ukjK/0g0D3InWrZdyPjpkQ==

Name: javax/mail/Header.class
Digest-Algorithms: SHA MD5 
SHA-Digest: IFMk6FsRtrIqQctMJikigWLUbmg=
MD5-Digest: R0oAtfAdypOCErv3dkz6vQ==

Name: javax/mail/IllegalWriteException.class
Digest-Algorithms: SHA MD5 
SHA-Digest: MkCNSyU6eqmTxTcHcHwkDslOJJQ=
MD5-Digest: bGUilxcMYqXte9kMlaXB1w==

最简单的可执行Jar，manifest.mf只要3行：

Manifest-Version: 1.0
Class-Path: 你的jar文件名.jar 其他jar文件名.jar
Main-Class: 你的包名.你的包含main方法的类名


nobody_am(小兵)，你列出来的那一大堆只是数字签名，可有可无的。
Class-Path也可以不要，但包括这一行可以避免很多类装载错误。多个class-path用空格隔开。

详情参阅j2sdk文档的
guidejarindex.html
guidejarjar.html
guideextensionsspec.html

j2sdk的文档可以到java.sun.com去找，哪里java的资源极其丰富，我常去。
sqlserver的包，放在外面没有问题的。

既然这么复杂，还学写它干什么，用工具能生产，你学了也没用阿。