很久前记录过一篇创建PDF 的文章，可以参考这里 java 利用 itext 创建pdf. 一般只是创建pdf, 但有些特殊情况还需要合并pdf 与拆分pdf, 这些功能对一iText 来说，不过是小菜一碟。创建pdf 的方法还是参考以前的文章吧，毕竟里面给出的函数齐全一些。今天用iText 5.0 测试了PDF 的合并与拆分，效果还是很好的，而且性能也不错。

java itext 合并PDF

1. 首先准备要合并的pdf，将内容放在一个 InputStream list 中，准备好目标文件目录

2. 调用 合并 pdf 的方法: concatPDFs, 传入输入流list, 输出文件流，是否处理分页参数.

3. 在 concatPDFs 方法中循环处理 将输入流转换成 PdfReader，并处理页码.

4. 利用 Document class和 PdfWriter.getInstance() 方法生成目标文件

5. 在循环中将所有输入的 PDF 合并到输出文件中.

代码如下 ：package com.yihaomen.pdf;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

import com.itextpdf.text.Document;

import com.itextpdf.text.pdf.BaseFont;

import com.itextpdf.text.pdf.PdfContentByte;

import com.itextpdf.text.pdf.PdfImportedPage;

import com.itextpdf.text.pdf.PdfReader;

import com.itextpdf.text.pdf.PdfWriter;

public class MergePDF {

public static void main(String[] args) {

try {

Listpdfs = new ArrayList();

for(int i=0;i<10;i++){

pdfs.add(new FileInputStream("d:\\pdf\\" + i +".pdf"));

}

OutputStream output = new FileOutputStream("d:\\pdf\\merge.pdf");

MergePDF.concatPDFs(pdfs, output, true);

} catch (Exception e) {

e.printStackTrace();

}

}

public static void concatPDFs(ListstreamOfPDFFiles,

OutputStream outputStream, boolean paginate) {

Document document = new Document();

try {

Listpdfs = streamOfPDFFiles;

Listreaders = new ArrayList();

int totalPages = 0;

IteratoriteratorPDFs = pdfs.iterator();

// Create Readers for the pdfs.

while (iteratorPDFs.hasNext()) {

InputStream pdf = iteratorPDFs.next();

PdfReader pdfReader = new PdfReader(pdf);

readers.add(pdfReader);

totalPages += pdfReader.getNumberOfPages();

}

// Create a writer for the outputstream

PdfWriter writer = PdfWriter.getInstance(document, outputStream);

document.open();

BaseFont bf = BaseFont.createFont(BaseFont.HELVETICA,

BaseFont.CP1252, BaseFont.NOT_EMBEDDED);

PdfContentByte cb = writer.getDirectContent(); // Holds the PDF

// data

PdfImportedPage page;

int currentPageNumber = 0;

int pageOfCurrentReaderPDF = 0;

IteratoriteratorPDFReader = readers.iterator();

// Loop through the PDF files and add to the output.

while (iteratorPDFReader.hasNext()) {

PdfReader pdfReader = iteratorPDFReader.next();

// Create a new page in the target for each source page.

while (pageOfCurrentReaderPDF < pdfReader.getNumberOfPages()) {

document.newPage();

pageOfCurrentReaderPDF++;

currentPageNumber++;

page = writer.getImportedPage(pdfReader,

pageOfCurrentReaderPDF);

cb.addTemplate(page, 0, 0);

// Code for pagination.

if (paginate) {

cb.beginText();

cb.setFontAndSize(bf, 9);

cb.showTextAligned(PdfContentByte.ALIGN_CENTER, ""

+ currentPageNumber + " of " + totalPages, 520,

5, 0);

cb.endText();

}

}

pageOfCurrentReaderPDF = 0;

}

outputStream.flush();

document.close();

outputStream.close();

} catch (Exception e) {

e.printStackTrace();

} finally {

if (document.isOpen())

document.close();

try {

if (outputStream != null)

outputStream.close();

} catch (IOException ioe) {

ioe.printStackTrace();

}

}

}

}

java itext 根据页码拆分 pdf 文档

目前简单实现根据页码拆分pdf 文档,代码如下:

package com.yihaomen.pdf;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import com.itextpdf.text.Document;

import com.itextpdf.text.pdf.PdfContentByte;

import com.itextpdf.text.pdf.PdfImportedPage;

import com.itextpdf.text.pdf.PdfReader;

import com.itextpdf.text.pdf.PdfWriter;

public class SplitPDF {

public static void main(String[] args) {

try {

splitPDF(new FileInputStream("d:\\pdf\\merge.pdf"),

new FileOutputStream("d:\\pdf\\output1.pdf"), 1, 5);

splitPDF(new FileInputStream("d:\\pdf\\merge.pdf"),

new FileOutputStream("d:\\pdf\\output2.pdf"), 6, 10);

} catch (Exception e) {

e.printStackTrace();

}

}

public static void splitPDF(InputStream inputStream,

OutputStream outputStream, int fromPage, int toPage) {

Document document = new Document();

try {

PdfReader inputPDF = new PdfReader(inputStream);

int totalPages = inputPDF.getNumberOfPages();

// make fromPage equals to toPage if it is greater

if (fromPage > toPage) {

fromPage = toPage;

}

if (toPage > totalPages) {

toPage = totalPages;

}

// Create a writer for the outputstream

PdfWriter writer = PdfWriter.getInstance(document, outputStream);

document.open();

PdfContentByte cb = writer.getDirectContent(); // Holds the PDF data

PdfImportedPage page;

while (fromPage <= toPage) {

document.newPage();

page = writer.getImportedPage(inputPDF, fromPage);

cb.addTemplate(page, 0, 0);

fromPage++;

}

outputStream.flush();

document.close();

outputStream.close();

} catch (Exception e) {

e.printStackTrace();

} finally {

if (document.isOpen())

document.close();

try {

if (outputStream != null)

outputStream.close();

} catch (IOException ioe) {

ioe.printStackTrace();

}

}

}

}

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