Question

java中，如何提取网页的指定内容

比如网页的源代码中出现多次
<class>123<br>
<class>acx<br>
<class>a12a<br>
如何用java能够提取到123、acx、a12a这内容，并写入在txt文件中。麻烦大神写个范例吧

Answer 1

FileReader fr = new FileReader("*.htm"); FileWriter fw = new FileWriter("E:/a.txt");
char[] c = new char[1024];
StringBuffer sb = new StringBuffer();
int n;
while ((n = fr.read(c)) != -1) {
sb.append(c, 0, n);
}
fr.close();

Pattern p = Pattern.compile("<class>.*?<br>");
Matcher m = p.matcher(sb);
while (m.find()) {
String tmp = m.group();
System.out.println(tmp);
System.out.println(tmp.substring(7, tmp.length() - 4));
fw.write(tmp.substring(7, tmp.length() - 4));
}

fw.close();