Java获取网页内容
以前都是用python写爬虫,这次使用java。代码虽然多了点,不过还是静态类型语言代码提示舒心点。获取网页源代码算是爬虫的基本入门吧。
我们采用Apache的commons-httpclient包进行抓取。需要用到三个包:commons-httpclient、commons-codec、commons-logging。用maven则只需添加如下dependency即可:
<dependency>
<groupId>commons-httpclient</groupId>
<artifactId>commons-httpclient</artifactId>
<version>3.1</version>
</dependency>
核心代码如下:
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.PostMethod;
import java.io.IOException;
public class Main {
public static String readUrl(String url) {
PostMethod method = new PostMethod(url);
String res = null;
try {
new HttpClient().executeMethod(method);
res = new String(method.getResponseBodyAsString().getBytes(), "utf8");
} catch (IOException e) {
e.printStackTrace();
}
return res;
}
public static void main(String[] args) {
System.out.println(readUrl("http://blog.zzkun.com"));
}
}
爬取本博客网站,执行结果如下: