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();


}


}