Java将图片组合成PDF文件的方法

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PDFtry {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;elsereturn 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{@Overridepublic 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;elseif(name.endsWith(".bmp") || name.endsWith(".tif"))return true;elsereturn 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 ;elseif((w < A4_weight)&&(h > A4_height))percent = (A4_height*100)/h;elseif((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();}}