HttpClient--HttpGet使用

最近公司在做一个爬虫工具，爬取公司现网的数据，留给方通项目使用

用到里阿帕奇的这两个类，在网上看到了一些资料结合自己的应用，这个贴出一个demo

import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;

import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

/**
* Created with .
* Date: 14-5-28
* Time: 下午12:17
* To change this template use File | Settings | File Templates.
*/
public class LoadImageClient {
CloseableHttpClient httpclient = HttpClients.createDefault();

public HttpGet doGet(String url) {
HttpGet httpGet = new HttpGet(url);
httpGet.addHeader("Accept", "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8");
httpGet.addHeader("Connection", "Keep-Alive");
httpGet.addHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:29.0) Gecko/20100101 Firefox/29.0");
httpGet.addHeader("Cookie", "");
return httpGet;

}

public void loadImage(int tid) {

CloseableHttpResponse response = null;
CloseableHttpResponse resImg = null;
try {

HttpGet httpGet = doGet("http://www.xxx.com/tt?tid=" + tid);

response = execute(httpGet);

if (response == null){
return;
}


String result = EntityUtils.toString(response.getEntity());

JSONObject json = new JSONObject();
JSONObject jsonObject = json.parseObject(result.toString().trim());
Object files = jsonObject.get("pictures");

if (files != null) {
JSONArray jsonArray = (JSONArray) files;
if (jsonArray.size() <= 0) return;
JSONObject o = (JSONObject) jsonArray.get(jsonArray.size() - 1);

String url = (String) o.get("url");
/* if(!url.contains("/sns/")){
return;
}*/

String fileName = url.substring(url.lastIndexOf("/") + 1);
System.out.println(Thread.currentThread().getName() + "--" + url);

File file = new File("e:\\pic\\" + fileName.trim());

/* if (!file.exists()) {
file.createNewFile();
}*/

FileOutputStream outputStream = new FileOutputStream(file);

HttpGet httpGetImg = doGet(url);
resImg = execute(httpGetImg);
if (resImg == null) return;

InputStream imgIs = resImg.getEntity().getContent();
BufferedInputStream bis = new BufferedInputStream(imgIs);
byte[] bytes = new byte[1024 * 1024];
int length = 0;
while ((length = bis.read(bytes)) > -1) {
outputStream.write(bytes, 0, length);
}

outputStream.flush();
outputStream.close();
}else{
System.out.println(Thread.currentThread().getName() + "--" + tid);
}

} catch (Exception e) {
e.printStackTrace();
} finally {
close(response);
close(resImg);
}
}

private void close(CloseableHttpResponse response) {
try {
if (response != null) response.close();
} catch (Exception e) {
e.printStackTrace();
}
}

private CloseableHttpResponse execute(HttpGet httpGet) {
CloseableHttpResponse response = null;
try {

response = httpclient.execute(httpGet);

int status = response.getStatusLine().getStatusCode();
if (status >= 200 && status < 300) {
return response;
}

response.close();
return null;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}

public static void main(String[] args) {
final LoadImageClient loadImage = new LoadImageClient();
List<Thread> threads = new ArrayList<Thread>();

for (int i = 10; i < 100; i++) {
final int t = i * 10;

Thread thread = new Thread(new Runnable() {
@Override
public void run() {
try {

int tid = 339000 + t;
for (int j = 10; j >=0 ; j--) {
loadImage.loadImage(tid + j);
}
} catch (Exception e) {
e.printStackTrace();
}
}
});
threads.add(thread);

}

for (Thread thread : threads) {
thread.start();
}

}
}

这里还有一种使用谷歌浏览器获取异步请求数据