求助 httpClient.execute 报空指针异常

[一个人的朝圣丶]

talk is cheap

package test;

import java.io.InputStream;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;

public class TestSpider {
	//使用HttpClient创建一个客户端
	private static HttpClient httpClient = null;
	
	/**
	 * @param path 目标网页的链接
	 * @return 表示是否可读取页面
	 * @throws Exception IO异常
	 */
	
	public boolean downloadPage(String path) throws Exception {
		InputStream is = null;
		//创建一个HttpGet类,相当于在浏览器(HttpClient)中输入了一个地址
		HttpGet httpGet = new HttpGet(path);
		HttpResponse response = httpClient.execute(httpGet);
		HttpEntity entity = response.getEntity();
		if(entity!=null) {
			is = entity.getContent();
		}
		
		int length;
		byte[] tmp = new byte[2048];
		while((length = is.read(tmp)) != -1) {
			System.out.println(new String(tmp,0,length,"UTF-8"));
		}
		
		
		return false;
	}
	
	public static void main(String[] args) throws Exception {
		TestSpider ts = new TestSpider();
		ts.downloadPage("http://www.baidu.com");
	}
}

Exception in thread "main" java.lang.NullPointerException
	at test.TestSpider.downloadPage(TestSpider.java:25)
	at test.TestSpider.main(TestSpider.java:43)

[李德胜1995]

25行httpClient为空。。。。

[一个人的朝圣丶]

为什么entity是空的啊

[110成成]

你的private static HttpClient httpClient = null; httpClient 为空啊，你没有创建啊。