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 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();


}


}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。

原文链接：https://blog.csdn.net/winminwu/article/details/78923643