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新手写java望大牛支持

2013-01-16 11:06:10 129 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

yiyefangzhou24 墨衍会员 · AI 创作全网分发关注 + 加入社区

STM32F407+LAN8720A+LwIP实战：FreeModbus TCP从机功能开发指南本文详细介绍了基于STM32F407和LAN8720A硬件平台，结合LwIP协议栈实现FreeModbus TCP从机功能的开发指南。内容涵盖硬件连接、LwIP移植、FreeModbus TCP从机实现、任务调度及调试技巧，为工业控制领域的以太网通信开发提供实用参考。阅读详情

网上超了一个java代码，jcreator编译通过，为何运行的时候出错Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
at org.apache.commons.httpclient.HttpClient.<clinit>(HttpClient.java:66)
at GoogleQuery.makeQuery(GoogleQuery.java:25)
at GoogleQuery.<init>(GoogleQuery.java:18)
at GoogleQuery.main(GoogleQuery.java:62)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at sun.misc.Launcher$ExtClassLoader.findClass(Launcher.java:229)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
... 4 more

Process completed.

...全文

GB28181协议心跳机制：从标准解读到代码实现的保活策略本文深入解析GB28181协议中的心跳机制，从标准解读到代码实现，详细介绍了保活策略的核心价值和底层逻辑。通过实战案例和技术要点，帮助开发者优化心跳间隔、超时次数等参数配置，提升安防监控系统的可靠性和性能。文章还提供了代码实现的防坑指南和特殊场景处理建议，适用于各类网络环境下的设备在线状态管理。阅读详情

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KingSen_Yale 2013-01-16

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yiyefangzhou24 2013-01-16

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引用 2 楼 lyh_zxc 的回复:

明显你有些jar包没导入，导致类没找到。

1.选择configure下面的options 2.然后选择JDK Profiles 选项 3.选中已经有的jdk，然后选择edit 4.单击add，选择下面的Add Archive 5.找到你需要添加的jar的位置，将jar包添加进去。就是这样？我导入了还是有 --------------------Configuration: <Default>-------------------- Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory at org.apache.commons.httpclient.HttpClient.<clinit>(HttpClient.java:66) at GoogleQuery.makeQuery(GoogleQuery.java:25) at GoogleQuery.<init>(GoogleQuery.java:18) at GoogleQuery.main(GoogleQuery.java:62) Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory at java.net.URLClassLoader$1.run(URLClassLoader.java:200) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at sun.misc.Launcher$ExtClassLoader.findClass(Launcher.java:229) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at java.lang.ClassLoader.loadClass(ClassLoader.java:252) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) ... 4 more Process completed.

小猴168 2013-01-16

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明显你有些jar包没导入，导致类没找到。

yiyefangzhou24 2013-01-16

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附上java代码

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
import org.json.JSONArray;
import org.json.JSONObject;

public class GoogleQuery
{
	public GoogleQuery() throws UnsupportedEncodingException
	{
		String query = URLEncoder.encode("AOP示例+site:blog.csdn.net/zhjb1025", "UTF-8");//站内搜索?
		for(int i=0;i<3;i++)
		{
			makeQuery("http://ajax.googleapis.com/ajax/services/search/web?start="+i*8+"&rsz=large&v=1.0&q="+query);
		}
	}
	private void makeQuery(String query)
	{
		try
		{
			HttpClient httpClient = new HttpClient();
			GetMethod getMethod = new GetMethod(query);
			httpClient.executeMethod(getMethod);
			getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER,new DefaultHttpMethodRetryHandler());
			int statusCode = httpClient.executeMethod(getMethod);
			if(statusCode!= HttpStatus.SC_OK) 
			{
				System.err.println("Method failed: "+getMethod.getStatusLine());
			}
			byte[] responseBody = getMethod.getResponseBody();
			String response = new String(responseBody,"UTF-8");
			JSONObject json = new JSONObject(response);
			
			System.out.println("Total results = "+ json.getJSONObject("responseData").getJSONObject("cursor").getString("estimatedResultCount"));
			
			JSONArray ja = json.getJSONObject("responseData").getJSONArray("results");
			System.out.println("Results:");
			for (int i = 0; i<ja.length();i++)
			{
				JSONObject j = ja.getJSONObject(i);
				System.out.println(j.getString("titleNoFormatting"));
				System.out.println(j.getString("url"));
				System.out.println(j.get("content"));
			}
		}
		catch(Exception e)
		{
			System.err.println("Something went wrong...");
			e.printStackTrace();
		}
		System.out.println("--------------------------------------------");
	}
	
	public static void main(String args[])
	{
		try
		{
			new GoogleQuery();
			
		}
		catch(UnsupportedEncodingException e)
		{
			e.printStackTrace();
		}
	}
}

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