Question

java怎么实现下载指定网页中包含的pdf文件。 求代码？

Answer 1

解析指定页面，得到pdf文件的地址，用URL来取回pdf的输入流，然后写到本地文件。

追问

给个示例，刚学。谢谢

追答

由于回答长度有限制，把导入的包都删掉了。自己导入
public class DownloadPdf {

public static void main(String[] args) {
new DownloadPdf().analyse("http://www1.ap.dell.com/content/topics/topic.aspx/ap/topics/services/zhcn/services_agreement?c=cn&cs=cndhs1&l=zh&s=dhs&~ck=anavml");
}

private void analyse(String site) {
// 正则表达式，解析网页中]*href=[\\'|\\\"]([^\\]*\\.pdf)[\\'|\\\"][^\\]*[\\>|\\/\\>]";
Pattern p = Pattern.compile(regex);

List pdfList = new ArrayList();

try {
URL url = new URL(site);

InputStream is = url.openStream();
BufferedReader br = new BufferedReader(new InputStreamReader(is));
String line;
while ((line = br.readLine()) != null) {
Matcher m = p.matcher(line);
while(m.find()){
// System.out.println(m.group(1));
// 把解析好的pdf的下载地址放到list中
pdfList.add(m.group(1));
}
}
br.close();
is.close();

String dir = "d:/pdf/";
File file = new File(dir);
if (!file.exists()) {
file.mkdirs();
}

// 遍历pdf地址的list，逐个下载
for (String pdf : pdfList) {
URL u = new URL(pdf);
InputStream i = u.openStream();
byte[] b = new byte[1024*1024];
int len;
String fileName = pdf.substring(pdf.lastIndexOf("/"));
OutputStream bos = new FileOutputStream(new File(dir + fileName));
while ((len = i.read(b)) != -1) {
bos.write(b, 0, len);
}
bos.flush();
bos.close();
i.close();
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}

Answer 2

HTML Parser

开源的，自己查 api 去吧