Hellow world PDF

%PDF-1.4 //header
%忏嫌
2 0 obj  // obj index 2, content object(steam)
<</Length 66/Filter/FlateDecode>>stream

 

endstream
endobj
4 0 obj  // obj index 4, Page, contains content, resources and mediabox
<</Parent 3 0 R/Contents 2 0 R/Type/Page/Resources<</Font<</F1 1 0 R>>>>/MediaBox[0 0 595 842]>>
endobj
1 0 obj  //obj index 1, Font obj
<</BaseFont/Helvetica/Type/Font/Encoding/WinAnsiEncoding/Subtype/Type1>>
endobj
3 0 obj  //obj index 3, Pages, contains 1 page refer to obj 4
<</Type/Pages/Count 1/Kids[4 0 R]>>
endobj
5 0 obj  //obj index 5, Catalog, root note of the PDF, contains pages obj(3)
<</Type/Catalog/Pages 3 0 R>>
endobj
6 0 obj  //Info(Meta data), custom is the customized property I set
<</Producer(iText?5.5.4 ?000-2014 iText Group NV \(AGPL-version\))/ModDate(D:20150212192112+08'00')/custom(shappy)/CreationDate(D:20150212192112+08'00')>>
endobj
xref  //Cross-reference table
0 7
0000000000 65535 f  //fix lines, max count 65536
0000000259 00000 n  //ojb 1, offset is 259(oct, not hex)
0000000015 00000 n
0000000347 00000 n
0000000147 00000 n
0000000398 00000 n
0000000443 00000 n
trailer
<</Root 5 0 R/ID [<b8938abe34e0551ebe110ffdc69300df><b8938abe34e0551ebe110ffdc69300df>]/Info 6 0 R/Size 7>>  //root
%iText-5.5.4
startxref  //ofset of cross-reference table(oct)
615
%%EOF