在测试crawler4j的controller类时抛出NoClassDefFoundError这个异常，该怎么解决？
我在测试crawler4j的controller类时抛出NoClassDefFoundError这个异常，该怎么解决？我把相应的jar包都加进去了，但是还是不行，是不是还差一些jar包啊，求大神打救！下面是我的源代码：
package service_impl;
import org.junit.Test;
import edu.uci.ics.crawler4j.crawler.CrawlConfig;
import edu.uci.ics.crawler4j.crawler.CrawlController;
import edu.uci.ics.crawler4j.fetcher.PageFetcher;
import edu.uci.ics.crawler4j.robotstxt.RobotstxtConfig;
import edu.uci.ics.crawler4j.robotstxt.RobotstxtServer;
public class Controller {
public static void main(String[] args) throws Exception {
String crawlStorageFolder = "/data/crawl/root";
int numberOfCrawlers = 7;
CrawlConfig config = new CrawlConfig();
config.setCrawlStorageFolder(crawlStorageFolder);
/*
* Instantiate the controller for this crawl.
*/
PageFetcher pageFetcher = new PageFetcher(config);
RobotstxtConfig robotstxtConfig = new RobotstxtConfig();
RobotstxtServer robotstxtServer = new RobotstxtServer(robotstxtConfig, pageFetcher);
CrawlController controller = new CrawlController(config, pageFetcher, robotstxtServer);
/*
* For each crawl, you need to add some seed urls. These are the first
* URLs that are fetched and then the crawler starts following links
* which are found in these pages
*/
controller.addSeed("http://www.ics.uci.edu/~welling/");
controller.addSeed("http://www.ics.uci.edu/~lopes/");
controller.addSeed("http://www.ics.uci.edu/");
/*
* Start the crawl. This is a blocking operation, meaning that your code
* will reach the line after this only when crawling is finished.
*/
controller.start(TaobaoImageCrawler.class, numberOfCrawlers);
}
}
package service_impl;
import java.io.File;
import java.util.regex.Pattern;
import edu.uci.ics.crawler4j.crawler.Page;
import edu.uci.ics.crawler4j.crawler.WebCrawler;
import edu.uci.ics.crawler4j.parser.BinaryParseData;
import edu.uci.ics.crawler4j.url.WebURL;
import edu.uci.ics.crawler4j.util.IO;
/**
* @author Yasser Ganjisaffar <lastname at gmail dot com>
*/
/*
* This class shows how you can crawl images on the web and store them in a
* folder. This is just for demonstration purposes and doesn't scale for large
* number of images. For crawling millions of images you would need to store
* downloaded images in a hierarchy of folders
*/
public class TaobaoImageCrawler extends WebCrawler {
private static final Pattern filters = Pattern.compile(".*(\\.(css|js|mid|mp2|mp3|mp4|wav|avi|mov|mpeg|ram|m4v|pdf"
+ "|rm|smil|wmv|swf|wma|zip|rar|gz))$");
private static final Pattern imgPatterns = Pattern.compile(".*(\\.(bmp|gif|jpe?g|png|tiff?))$");
private static File storageFolder;
private static String[] crawlDomains;
public static void configure(String[] domain, String storageFolderName) {
TaobaoImageCrawler.crawlDomains = domain;
storageFolder = new File(storageFolderName);
if (!storageFolder.exists()) {
storageFolder.mkdirs();
}
}
@Override
public boolean shouldVisit(WebURL url) {
String href = url.getURL().toLowerCase();
if (filters.matcher(href).matches()) {
return false;
}
if (imgPatterns.matcher(href).matches()) {
return true;
}
for (String domain : crawlDomains) {
if (href.startsWith(domain)) {
return true;
}
}
return false;
}
@Override
public void visit(Page page) {
String url = page.getWebURL().getURL();
// We are only interested in processing images
if (!(page.getParseData() instanceof BinaryParseData)) {
return;
}
if (!imgPatterns.matcher(url).matches()) {
return;
}
// Not interested in very small images
if (page.getContentData().length < 10 * 1024) {
return;
}
// get a unique name for storing this image
String extension = url.substring(url.lastIndexOf("."));
String hashedName = extension;
// store image
IO.writeBytesToFile(page.getContentData(), storageFolder.getAbsolutePath() + "/" + hashedName);
System.out.println("Stored: " + url);
}
}
我尝试了很多方法都解决不了，求各位帮忙！
crawler4j 异常 NoClassDefFoundError --------------------编程问答-------------------- 这是抛出的异常：
Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/http/util/Args
at org.apache.http.conn.scheme.Scheme.<init>(Scheme.java:90)
at edu.uci.ics.crawler4j.fetcher.PageFetcher.<init>(PageFetcher.java:93)
at service_impl.Controller.main(Controller.java:23)
Caused by: java.lang.ClassNotFoundException: org.apache.http.util.Args
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
... 3 more
--------------------编程问答-------------------- 我在apache geronimo 上发布程序（使用了httpclient）,也报这个错误，但是在别的server如tomcat都好的呀，不知道怎么回事，急死人啦 --------------------编程问答-------------------- 你用的 httpcore-x.x.x.jar 是 4.2 以前的版本吧？
在 4.3 以后才加入的 org.apache.http.util.Args
换成 4.3 试试 --------------------编程问答-------------------- http://bbs.csdn.net/topics/390660601?page=1#post-396260720 同求解 --------------------编程问答--------------------
版主 求救啊:http://bbs.csdn.net/topics/390660601?page=1#post-396260720 --------------------编程问答-------------------- 你那个是 httpcore 包重复导入的问题(你导入了俩，一个 4.3 一个 4.0.1)，已回复。
补充：Java , Web 开发
