http://www.qqread.com/java/2010/01/c488170.html
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Semaphore;
public class ConcurrentTest {
private static int thread_num = 200;
private static int client_num = 460;
private static Map keywordMap = new HashMap();
static {
try {
InputStreamReader isr = new InputStreamReader(new FileInputStream(
new File("clicks.txt")), "GBK");
BufferedReader buffer = new BufferedReader(isr);
String line = "";
while ((line = buffer.readLine()) != null) {
keywordMap.put(line.substring(0, line.lastIndexOf(":")), "");
}
} catch (Exception e) {
e.printStackTrace();
}
}
public static void main(String[] args) {
int size = keywordMap.size();
// TODO Auto-generated method stub
ExecutorService exec = Executors.newCachedThreadPool();
// 50個(gè)線程可以同時(shí)訪問
final Semaphore semp = new Semaphore(thread_num);
// 模擬2000個(gè)客戶端訪問
for (int index = 0; index < client_num; index++) {
final int NO = index;
Runnable run = new Runnable() {
public void run() {
try {
// 獲取許可
semp.acquire();
System.out.println("Thread:" + NO);
String host = "http://10.99.23.42:7001/KMQueryCenter/query.do?";
String para = "method=getQueryResult&pageNum=1&pageSize=5&"
+ "queryKeyWord="
+ getRandomSearchKey(NO)
+ "&questionID=-1&questionIdPath=-1&searchType=1"
+ "&proLine=&proSeries=&proType=" + NO;
System.out.println(host + para);
URL url = new URL(host);// 此處填寫供測試的url
HttpURLConnection connection = (HttpURLConnection) url
.openConnection();
// connection.setRequestMethod("POST");
// connection.setRequestProperty("Proxy-Connection",
// "Keep-Alive");
connection.setDoOutput(true);
connection.setDoInput(true);
PrintWriter out = new PrintWriter(connection
.getOutputStream());
out.print(para);
out.flush();
out.close();
BufferedReader in = new BufferedReader(
new InputStreamReader(connection
.getInputStream()));
String line = "";
String result = "";
while ((line = in.readLine()) != null) {
result += line;
}
// System.out.println(result);
// Thread.sleep((long) (Math.random()) * 1000);
// 釋放
System.out.println("第：" + NO + " 個(gè)");
semp.release();
} catch (Exception e) {
e.printStackTrace();
}
}
};
exec.execute(run);
}
// 退出線程池
exec.shutdown();
}
private static String getRandomSearchKey(final int no) {
String ret = "";
int size = keywordMap.size();
// int wanna = (int) (Math.random()) * (size - 1);
ret = (keywordMap.entrySet().toArray())[no].toString();
ret = ret.substring(0, ret.lastIndexOf("="));
System.out.println("\t" + ret);
return ret;
}
}
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