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：

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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); 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); 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); 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); jtf = new jtextfield(shuoming); jtf.setbounds(50,225, 615, 50); jtf.setenabled(false); jp.add(jtf); jf.add(jp); jf.setsize(715,315); jf.setresizable(false); jf.setlocationrelativeto(null); jf.setvisible(true); jf.setdefaultcloseoperation(jframe.exit_on_close); } 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); } } 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); } } private class begin implements actionlistener{ public void actionperformed(actionevent e){ 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){ 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()); 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