Java将图片组合成PDF文件的方法

Java将图片组合成PDF文件的方法

本文实例为大家分享了java将图片组合成PDF文件的具体代码，供大家参考，具体内容如http://下

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 JTexthttp://Field();

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://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[] fLrSAsKbioiles = 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

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();

}

}

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();

}

}

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