itext实现pdf模板生成报表

思路很简单：定义pdf表单作为模板，调用itext api填充表单并输出报表。

由于比较简单，就不多描述，直接贴上Demo代码。

package com.itextpdf;

import java.io.ByteArrayOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.pdf.AcroFields;
import com.itextpdf.text.pdf.PdfCopy;
import com.itextpdf.text.pdf.PdfPTable;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStamper;
import com.itextpdf.text.pdf.PdfWriter;

public class Test {

    public static void main(String[] args) throws DocumentException, IOException {
        //填充表单
        PdfReader reader = new PdfReader("c:/tmpl.pdf");
        ByteArrayOutputStream tempBaos = new ByteArrayOutputStream();
        PdfStamper stamp = new PdfStamper(reader, tempBaos);
        AcroFields form = stamp.getAcroFields();
        fillForm(form);
        stamp.setFormFlattening(true);
        stamp.close();
        
        //可能除了输出模板外，还需要加入其它元素。
        int totalPage = 1;
        Document detailDoc = new Document(reader.getPageSize(1));
        ByteArrayOutputStream detaialBaos = new ByteArrayOutputStream();
        PdfWriter writer = PdfWriter.getInstance(detailDoc, detaialBaos);
        detailDoc.open();
        PdfPTable pTable = genOtherTable();
        detailDoc.newPage();
        detailDoc.add(pTable);
        detailDoc.close();
        totalPage += writer.getPageNumber() - 1;

        // 合并模板与其它页，并生成最后报表
        OutputStream outputStream = new FileOutputStream("c:/result.pdf");
        Document doc = new Document(reader.getPageSize(1));
        PdfCopy copy = new PdfCopy(doc, outputStream);
        doc.open();
        doc.newPage();
        copy.addPage(copy.getImportedPage(new PdfReader(tempBaos.toByteArray()), 1));
        doc.resetPageCount();

        for (int i = 1; i <= totalPage - 1; i++) {
            doc.newPage();
            copy.addPage(copy.getImportedPage(new PdfReader(detaialBaos.toByteArray()), i));
            doc.resetPageCount();
        }

        doc.close();
    }

    private static PdfPTable genOtherTable() {
        PdfPTable table = new PdfPTable(2);
        table.addCell("11111111");
        table.addCell("22222222");

        return table;
    }

    private static void fillForm(AcroFields form) throws IOException,
            DocumentException {
        form.setField("name", "jeffreyzhang");
        form.setField("sex", "boy");

    }

}