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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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();}} |
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原文链接：https://blog.csdn.net/winminwu/article/details/78923643
