iText分割和合并pdf文件

1.import java.io.FileOutputStream;
2.import java.io.IOException;
3.import java.util.ArrayList;
4.
5.import com.lowagie.text.Document;
6.import com.lowagie.text.DocumentException;
7.import com.lowagie.text.pdf.PdfCopy;
8.import com.lowagie.text.pdf.PdfImportedPage;
9.import com.lowagie.text.pdf.PdfReader;
10.
11.
12.public class pdfOperate
13.{
14.private static final int N = 3;
15.
16.public static void main(String[] args)
17. {
18. String[] files = {"C:\\a.pdf", "C:\\b.pdf"};
19. String savepath = "C:\\temp.pdf";
20. mergePdfFiles(files, savepath);
21.
22. partitionPdfFile("C:\\a.pdf");
23. }
24.
25.public static void mergePdfFiles(String[] files, String savepath) //合并
26. {
27.try
28. {
29. Document document = new Document(new PdfReader(files[0]).getPageSize(1));
30.
31. PdfCopy copy = new PdfCopy(document, new FileOutputStream(savepath));
32.
33. document.open();
34.
35.for(int i=0; i<files.length; i++)
36. {
37. PdfReader reader = new PdfReader(files[i]);
38.
39.int n = reader.getNumberOfPages();
40.
41.for(int j=1; j<=n; j++)
42. {
43. document.newPage();
44. PdfImportedPage page = copy.getImportedPage(reader, j);
45. copy.addPage(page);
46. }
47. }
48.
49. document.close();
50.
51. } catch (IOException e) {
52. e.printStackTrace();
53. } catch(DocumentException e) {
54. e.printStackTrace();
55. }
56. }
57.
58.public static void partitionPdfFile(String filepath) // 分割
59. {
60. Document document = null;
61. PdfCopy copy = null;
62.
63.try
64. {
65. PdfReader reader = new PdfReader(filepath);
66.
67.int n = reader.getNumberOfPages();
68.
69.if(n < N)
70. {
71. System.out.println("The document does not have " + N + " pages to partition !"
);
72.return;
73. }
74.
75.int size = n/N;
76. String staticpath = filepath.substring(0, stIndexOf("\\")+1);
77. String savepath = null;
78. ArrayList<String> savepaths = new ArrayList<String>();
79.for(int i=1; i<=N; i++)
80. {
81.if(i < 10)
82. {
83. savepath = filepath.substring(stIndexOf("\\")+1, filepath.lengt
h()-4);
84. savepath = staticpath + savepath + "0" + i + ".pdf";
85. savepaths.add(savepath);
86. }
87.else
88. {
89. savepath = filepath.substring(stIndexOf("\\")+1, filepath.lengt
h()-4);
90. savepath = staticpath + savepath + i + ".pdf";
91. savepaths.add(savepath);
92. }
93. }
94.
95.for(int i=0; i<N-1; i++)
96. {
97. document = new Document(reader.getPageSize(1));
98. copy = new PdfCopy(document, new FileOutputStream(savepaths.get(i)));
99. document.open();
100.for(int j=size*i+1; j<=size*(i+1); j++)
101. {
102. document.newPage();
103. PdfImportedPage page = copy.getImportedPage(reader, j);
104. copy.addPage(page);
105. }
106. document.close();
107. }
108.
109.
110. document = new Document(reader.getPageSize(1));
111. copy = new PdfCopy(document, new FileOutputStream(savepaths.get(N-1)));
112. document.open();
113.for(int j=size*(N-1)+1; j<=n; j++)
114. {
115. document.newPage();
116. PdfImportedPage page = copy.getImportedPage(reader, j);
117. copy.addPage(page);
118. }
119. document.close();
120.
121. } catch (IOException e) {
122. e.printStackTrace();
123. } catch(DocumentException e) {
124. e.printStackTrace();
125. }
126. }
127.}。