html转pdf 以 开源世界旅行手册 这本书为例
1.第一步 从该网站爬取所有html网页
public class DownBook {
public static void main(String[] args) {
// TODO Auto-generated method stub
String dirPath = "./html";
String item = "index.html";
while(item!=null&&item!=""){
try {
String html= Util.downloadPage("https://i.linuxtoy.org/docs/guide/" + item, dirPath, item);
item = getUrl(html);
} catch (Exception ex) {
}
}
}
static String getUrl(String text) {
Pattern pattern = Pattern.compile("<a accesskey=\"n\" href=\"([-A-Za-z0-9+&@#/%?=~_|!:,.;]+[-A-Za-z0-9+&@#/%=~_|])\">下一页</a>");
Matcher m = pattern.matcher(text);
String str = "";
if (m.find()) {
str = m.group(1);
}
return str;
}
}2.第二步，把html转换成pdf 这里用的是wkhtmltopdf软件，百度该软件下载安装
public class ToPDF {
public static void main(String[] args) {
File rootPath = new File("./html");
String pdfPath = "./pdf//";
File[] files = rootPath.listFiles();
Arrays.sort(files, new Comparator<File>() {
public int compare(File f1, File f2) {
long diff = f1.lastModified() - f2.lastModified();
if (diff > 0)
return 1;
else if (diff == 0)
return 0;
else
return -1;// 如果 if 中修改为 返回-1 同时此处修改为返回 1 排序就会是递减
}
public boolean equals(Object obj) {
return true;
}
});
for (File f : files) {
if (f.isFile() && f.getName().indexOf("html") != -1) {
String fileName = f.getName();
String pdfName = fileName.replace("html", "pdf");
Util.convert("./html//" + fileName, pdfPath + pdfName);
// Thread.sleep(500);
}
}
}
}3.将多个pdf合并成一个pdf文件
public class PDFCombine {
public static void main(String[] args) {
// TODO Auto-generated method stub
File rootPath = new File("./pdf");
File[] files = rootPath.listFiles();
Arrays.sort(files, new Comparator<File>() {
public int compare(File f1, File f2) {
long diff = f1.lastModified() - f2.lastModified();
if (diff > 0)
return 1;
else if (diff == 0)
return 0;
else
return -1;//如果 if 中修改为 返回-1 同时此处修改为返回 1 排序就会是递减
}
public boolean equals(Object obj) {
return true;
}
});
try{
File f =Util. mulFile2One(Arrays.asList(files), "./开源世界旅行手册.pdf");
System.out.println(f.length());
}
catch (Exception ex){
}
}
}所用到的Util类
public class Util {
public static String downloadPage(String u, String mkd,String title1) throws UnsupportedEncodingException, IOException {
URL url = new URL(u);
String uri = url.getHost();
System.out.println("URI:" + uri);
Document doc = Jsoup.connect(u).get();
Elements ele = doc.getElementsByTag("title");
String title = ele.text();
System.out.println("url：" + u);
System.out.println("网页标题：" + title);
File mk = new File(mkd);
if (mk.exists()) {
System.out.println("目录" + mk + "已经存在");
} else {
mk.mkdir();
System.out.println("创建目录" + mk + "成功");
}
System.out.println("MK:" + mk);
try {
BufferedReader br = new BufferedReader(new InputStreamReader(url.openStream(), "utf8"));
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(new File(mk + "/" + title1)), "utf8"));
String line;
while ((line = br.readLine()) != null) {
bw.write(line);
}
br.close();
bw.close();
System.out.println("下载完毕！");
} catch (MalformedURLException e) {
e.printStackTrace();
}
return doc.outerHtml();
}
private static final String toPdfTool = "D:\\Program Files\\Wkhtmltopdf\\bin\\wkhtmltopdf.exe";
/**
* html转pdf
* @param srcPath html路径，可以是硬盘上的路径，也可以是网络路径
* @param destPath pdf保存路径
* @return 转换成功返回true
*/
public static boolean convert(String srcPath, String destPath){
File file = new File(destPath);
File parent = file.getParentFile();
//如果pdf保存路径不存在，则创建路径
if(!parent.exists()){
parent.mkdirs();
}
StringBuilder cmd = new StringBuilder();
cmd.append(toPdfTool);
cmd.append(" ");
cmd.append(" --header-line");//页眉下面的线
cmd.append(" --header-center 这里是页眉这里是页眉这里是页眉这里是页眉 ");//页眉中间内容
//cmd.append(" --margin-top 30mm ");//设置页面上边距 (default 10mm)
cmd.append(" --header-spacing 10 ");// (设置页眉和内容的距离,默认0)
cmd.append(srcPath);
cmd.append(" ");
cmd.append(destPath);
boolean result = true;
try{
Process proc = Runtime.getRuntime().exec(cmd.toString());
HtmlToPdfInterceptor error = new Util().new HtmlToPdfInterceptor(proc.getErrorStream());
HtmlToPdfInterceptor output =new Util(). new HtmlToPdfInterceptor(proc.getInputStream());
error.start();
output.start();
proc.waitFor();
}catch(Exception e){
result = false;
e.printStackTrace();
}
return result;
}
public static File mulFile2One(List<File> files, String targetPath) throws IOException{
// pdf合并工具类
PDFMergerUtility mergePdf = new PDFMergerUtility();
for (File f : files) {
if(f.exists() && f.isFile()){
// 循环添加要合并的pdf
mergePdf.addSource(f);
}
} // 设置合并生成pdf文件名称
mergePdf.setDestinationFileName(targetPath); // 合并pdf
mergePdf.mergeDocuments(MemoryUsageSetting.setupMainMemoryOnly());
return new File(targetPath);
}
public class HtmlToPdfInterceptor extends Thread {
private InputStream is;
public HtmlToPdfInterceptor(InputStream is){
this.is = is;
}
public void run(){
try{
InputStreamReader isr = new InputStreamReader(is, "utf-8");
BufferedReader br = new BufferedReader(isr);
String line = null;
while ((line = br.readLine()) != null) {
System.out.println(line.toString()); //输出内容
}
}catch (IOException e){
e.printStackTrace();
}
}
}
}