Java 将图片组合成PDF文件

程序界面图：

代码清单：

package 将图片组合成PDF文件;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileFilter;
import java.io.FileOutputStream;
import java.io.IOException;


import javax.swing.JButton;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.filechooser.FileNameExtensionFilter;


import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Image;
import com.itextpdf.text.PageSize;
import com.itextpdf.text.pdf.PdfWriter;




/*
 * 绘制主界面以及处理按钮事件类——Jiemian_main
 * 
 * */
class Jiemian_mian extends JFrame{

private static final long serialVersionUID = 1657254256189721759L;


final private String shuoming = " 使用说明: 本程序的主要功能就是将图片组按比例缩放合成于同一PDF文件里。 ——winmin"; private String dir_open = ""; private String dir_save = ""; public JFrame jf = null; private JPanel jp = null; private JButton jb_open = null; private JButton jb_save =null; private JButton jb_ok = null; private JTextField jt_dir_open = null; private JTextField jt_dir_save = null; private JLabel jl_dir_open = null; private JLabel jl_dir_save = null; private JLabel jl_lujing_open = null; private JLabel jl_lujing_save = null; private JTextField jtf = null; public Jiemian_mian(){ jf = new JFrame("将图片组合成PDF文件"); jp = new JPanel(); jp.setLayout(null); /*标签*/ jl_dir_open = new JLabel("请选择图片组所在的文件夹："); jl_dir_save = new JLabel("请选择PDF的合成位置："); jl_lujing_open = new JLabel("路径："); jl_lujing_save = new JLabel("路径："); jl_dir_open.setBounds(50, 50, 200, 20); jl_dir_save.setBounds(420, 50, 200, 20); jl_lujing_open.setBounds(50, 80, 40, 20); jl_lujing_save.setBounds(420, 80, 40, 20); jp.add(jl_dir_open); jp.add(jl_dir_save); jp.add(jl_lujing_open); jp.add(jl_lujing_save); /*按钮*/ jb_open = new JButton("浏览"); jb_save = new JButton("浏览"); jb_ok = new JButton("开始合成"); jb_open.setBounds(230, 80, 65, 20); jb_save.setBounds(600, 80, 65, 20); jb_ok.setBounds(310, 165, 90, 30); jb_open.addActionListener(new Open()); jb_save.addActionListener(new Save()); jb_ok.addActionListener(new Begin()); jp.add(jb_open); jp.add(jb_save); jp.add(jb_ok); /*单行文本（路径显示）*/ jt_dir_open = new JTextField(); jt_dir_save = new JTextField(); jt_dir_open.setBounds(90, 80, 130, 20); jt_dir_save.setBounds(460, 80, 130, 20); jt_dir_open.setEditable(false); jt_dir_save.setEditable(false); jp.add(jt_dir_open); jp.add(jt_dir_save); /*文本框（使用说明）*/ jtf = new JTextField(shuoming); jtf.setBounds(50,225, 615, 50); jtf.setEnabled(false); jp.add(jtf); /*主框*/ jf.add(jp); jf.setSize(715,315); jf.setResizable(false); jf.setLocationRelativeTo(null); jf.setVisible(true); jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } /*获取图片路径的按钮事件处理*/ private class Open implements ActionListener{ public void actionPerformed(ActionEvent e){ Lujing_get lujing_get = new Lujing_get(jf); //创建Lujing_get对象，获取图片组路径 dir_open = lujing_get.open_get(); jt_dir_open.setText(dir_open); } } /*获取选择保存PDF所生成位置的路径的按钮事件处理*/ private class Save implements ActionListener{ public void actionPerformed(ActionEvent e){ Lujing_get lujing_get = new Lujing_get(jf); //创建Lujing_get对象，获取选择保存PDF所生成位置的路径 dir_save = lujing_get.save_get(); jt_dir_save.setText(dir_save); } } /*合成PDF的按钮事件处理*/ private class Begin implements ActionListener{ public void actionPerformed(ActionEvent e){ /*准确处理所获取的路径*/ if(dir_save.equals("") || dir_open.equals("")){ JOptionPane.showMessageDialog(jf, "请输入图片组的路径及PDF的保存路径","警告",JOptionPane.WARNING_MESSAGE); }else{ File_deal fd = new File_deal(dir_open); //创建File_deal对象，将图片组路径下的所有图片文件准确加载 if(fd.files() != null){ /*准确处理PDF的命名规则（去掉后缀名）*/ if(dir_save.lastIndexOf(".") != (-1)) dir_save = dir_save.substring(0, dir_save.lastIndexOf(".")); WM_CreatPDF pdf_creat = new WM_CreatPDF(fd.files(),dir_save); //创建WM_CreatPDF对象，生成PDF try { pdf_creat.creatPDF(); //合成PDF文件 } catch (DocumentException e1) { // TODO 自动生成的 catch 块 e1.printStackTrace(); } catch (IOException e1) { // TODO 自动生成的 catch 块 e1.printStackTrace(); } JOptionPane.showMessageDialog(jf,"已合成PDF文件，所在位置："+dir_save+".pdf", "完成",JOptionPane.PLAIN_MESSAGE); }else JOptionPane.showMessageDialog(jf, "该文件夹下没有图片格式文件（.jpg/.png/.bmp/.tif）！", "警告",JOptionPane.WARNING_MESSAGE); } } } } class Lujing_get { private JFrame jf = null; public Lujing_get(JFrame jf){ this.jf = jf; } public String open_get(){ String dir = ""; JFileChooser jfc = new JFileChooser(); //创建“选择文件浏览器”对象 jfc.setDialogTitle("请选择图片组所在的文件夹"); jfc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY); int returnVal = jfc.showOpenDialog(jf); if(JFileChooser.APPROVE_OPTION == returnVal){ dir = jfc.getSelectedFile().toString(); } return dir; //返回路径 } public String save_get(){ String dir = ""; JFileChooser jfc = new JFileChooser(); //创建“选择文件浏览器”对象 jfc.setDialogTitle("请选择PDF的合成位置"); FileNameExtensionFilter filter = new FileNameExtensionFilter("pdf","PDF"); jfc.setFileFilter(filter); int returnVal = jfc.showSaveDialog(jf); if(JFileChooser.APPROVE_OPTION == returnVal){ dir = jfc.getSelectedFile().toString(); } return dir; //返回路径 } } /*  *获取图片文件  *   * */ class File_deal{ private String dir_open = ""; public File_deal(String dir_open){ this.dir_open = dir_open; } public File[] files(){ File f = new File(dir_open); File fs[] = f.listFiles(new PhotoFileFilter()); if(fs.length != 0) return fs; else return null; }  } /*  *   * 文件过滤器，将所在目录下的图片格式文件返回  * */ class PhotoFileFilter implements FileFilter{ @Override public boolean accept(File file) { // TODO 自动生成的方法存根 if(file.isDirectory()) return false; else{ String name = file.getName(); if(name.endsWith(".jpg") || name.endsWith(".png")) return true; else if(name.endsWith(".bmp") || name.endsWith(".tif")) return true; else return false; } } } /*  * 生成PDF文件（此类要外部引用“itextpdf.jar”，下载地址为：http://www.java2s.com/Code/Jar/i/itextpdf.htm）  *   * */ class WM_CreatPDF { final private float A4_weight = 595-60; //标准A4的宽 final private float A4_height = 842-60; //标准A4的高 private File[] files = null;  private String dir_save =""; public WM_CreatPDF(File[] files,String dir_save){ this.files = files; this.dir_save = dir_save; } public void creatPDF() throws  DocumentException, IOException{ Document document = new Document(PageSize.A4,30,30,30,30); //创建文档容器 PdfWriter.getInstance(document,new FileOutputStream(dir_save+".pdf")); //创建编写器（PDF类型） document.open(); //打开容器 float percent=100; float w,h; for(int i=0;i<files.length;i++){ Image img = Image.getInstance(files[i].getCanonicalPath()); /*处理图片缩放比例*/ w = img.getWidth(); h = img.getHeight(); if((w > A4_weight)&&(h < A4_height)) percent = (A4_weight*100)/w ; else if((w < A4_weight)&&(h > A4_height)) percent = (A4_height*100)/h; else if((w > A4_weight)&&(h > A4_height)){ percent = (A4_weight*100)/w ; h = (h*percent)/100; if(h > A4_height) percent = (A4_height*100)/h; } img.scalePercent(percent); document.add(img); } document.close(); //关闭容器 } public static void main(String[] args) { // TODO 自动生成的方法存根 new Jiemian_mian(); } }