httpClient多线程请求

使用httpClient可模拟请求Url获取资源，使用单线程的请求速度上会有一定的限制，参考了Apache给出的例子，自己做了测试实现多线程并发请求，以下代码需要HttpClient 4.2的包，可以在http://hc.apache.org/downloads.cgi下载

1、并发请求

package generate.httpclient;

import java.util.List;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.conn.ClientConnectionManager;
import org.apache.http.conn.params.ConnManagerParams;
import org.apache.http.conn.scheme.PlainSocketFactory;
import org.apache.http.conn.scheme.Scheme;
import org.apache.http.conn.scheme.SchemeRegistry;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.conn.PoolingClientConnectionManager;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.EntityUtils;

public class ThreadPoolHttpClient {
// 线程池
private ExecutorService exe = null;
// 线程池的容量
private static final int POOL_SIZE = 20;
private HttpClient client = null;
String[] urls=null;
public ThreadPoolHttpClient(String[] urls){
this.urls=urls;
}
public void test() throws Exception {
exe = Executors.newFixedThreadPool(POOL_SIZE);
HttpParams params =new BasicHttpParams();
/* 从连接池中取连接的超时时间 */
ConnManagerParams.setTimeout(params, 1000);
/* 连接超时 */
HttpConnectionParams.setConnectionTimeout(params, 2000);
/* 请求超时 */
HttpConnectionParams.setSoTimeout(params, 4000);
SchemeRegistry schemeRegistry = new SchemeRegistry();
schemeRegistry.register(
new Scheme("http", 80, PlainSocketFactory.getSocketFactory()));

//ClientConnectionManager cm = new PoolingClientConnectionManager(schemeRegistry);
PoolingClientConnectionManager cm=new PoolingClientConnectionManager(schemeRegistry);
cm.setMaxTotal(10);
final HttpClient httpClient = new DefaultHttpClient(cm,params);

// URIs to perform GETs on
final String[] urisToGet = urls;
/* 有多少url创建多少线程，url多时机子撑不住
// create a thread for each URI
GetThread[] threads = new GetThread[urisToGet.length];
for (int i = 0; i < threads.length; i++) {
HttpGet httpget = new HttpGet(urisToGet[i]);
threads[i] = new GetThread(httpClient, httpget);
}
// start the threads
for (int j = 0; j < threads.length; j++) {
threads[j].start();
}

// join the threads，等待所有请求完成
for (int j = 0; j < threads.length; j++) {
threads[j].join();
}
使用线程池*/
for (int i = 0; i < urisToGet.length; i++) {
final int j=i;
System.out.println(j);
HttpGet httpget = new HttpGet(urisToGet[i]);
exe.execute( new GetThread(httpClient, httpget));
}

//创建线程池，每次调用POOL_SIZE
/*
for (int i = 0; i < urisToGet.length; i++) {
final int j=i;
System.out.println(j);
exe.execute(new Thread() {
@Override
public void run() {
this.setName("threadsPoolClient"+j);

try {
this.sleep(100);
System.out.println(j);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

HttpGet httpget = new HttpGet(urisToGet[j]);
new GetThread(httpClient, httpget).get();
}

});
}

*/
//exe.shutdown();
System.out.println("Done");
}
static class GetThread extends Thread{

private final HttpClient httpClient;
private final HttpContext context;
private final HttpGet httpget;

public GetThread(HttpClient httpClient, HttpGet httpget) {
this.httpClient = httpClient;
this.context = new BasicHttpContext();
this.httpget = httpget;
}
@Override
public void run(){
this.setName("threadsPoolClient");
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
get();
}

public void get() {
try {
HttpResponse response = this.httpClient.execute(this.httpget, this.context);
HttpEntity entity = response.getEntity();
if (entity != null) {
System.out.println(this.httpget.getURI()+": status"+response.getStatusLine().toString());
}
// ensure the connection gets released to the manager
EntityUtils.consume(entity);
} catch (Exception ex) {
this.httpget.abort();
}finally{
httpget.releaseConnection();
}
}
}
}

2、多线程异步请求

package generate.httpclient;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CountDownLatch;

import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.concurrent.FutureCallback;
import org.apache.http.impl.nio.client.DefaultHttpAsyncClient;
import org.apache.http.nio.client.HttpAsyncClient;
import org.apache.http.nio.reactor.IOReactorException;

public class AsynClient{
/**
* @param args
* @throws IOReactorException
* @throws InterruptedException
*/
private List<String> urls;
private HandlerFailThread failHandler;
public AsynClient(List<String> list){
failHandler=new HandlerFailThread();
urls=list;
}
public Map<String,String> asynGet() throws IOReactorException,
InterruptedException {
final HttpAsyncClient httpclient = new DefaultHttpAsyncClient();
httpclient.start();
int urlLength=urls.size();
HttpGet[] requests = new HttpGet[urlLength];
int i=0;
for(String url : urls){
requests[i]=new HttpGet(url);
i++;
}
final CountDownLatch latch = new CountDownLatch(requests.length);
final Map<String, String> responseMap=new HashMap<String, String>();
try {
for (final HttpGet request : requests) {
httpclient.execute(request, new FutureCallback<HttpResponse>() {

public void completed(final HttpResponse response) {
latch.countDown();
responseMap.put(request.getURI().toString(), response.getStatusLine().toString());
try {
System.out.println(request.getRequestLine() + "->"
+ response.getStatusLine()+"->");
//+readInputStream(response.getEntity().getContent())

} catch (IllegalStateException e) {
failHandler.putFailUrl(request.getURI().toString(),
response.getStatusLine().toString());
e.printStackTrace();
} catch (Exception e) {
failHandler.putFailUrl(request.getURI().toString(),
response.getStatusLine().toString());
e.printStackTrace();
}
}

public void failed(final Exception ex) {
latch.countDown();
ex.printStackTrace();
failHandler.putFailUrl(request.getURI().toString(),
ex.getMessage());
}

public void cancelled() {
latch.countDown();
}

});
}
System.out.println("Doing...");
} finally {
latch.await();
httpclient.shutdown();
}
System.out.println("Done");
failHandler.printFailUrl();
return responseMap;
}
private String readInputStream(InputStream input) throws IOException{
byte[] buffer = new byte[128];
int len = 0;
ByteArrayOutputStream bytes = new ByteArrayOutputStream();
while((len = input.read(buffer)) >= 0) {
bytes.write(buffer, 0, len);
}
return bytes.toString();
}
/**
* Test
* @param args
*/
public static void main(String[] args) {
List<String> urls=new ArrayList<String>();
urls.add("http://127.0.0.1/examples/servlets/");
urls.add("http://127.0.0.1/examples/servlets/");
urls.add("http://127.0.0.1/examples/servlets/");
for(int i=0;i<10;i++){
urls.addAll(urls);
}
System.out.println(urls.size());
AsynClient client=new AsynClient(urls);
try {
client.asynGet();
} catch (IOReactorException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
}
System.out.println("done");
}
}

创建一个线程记录失败的请求

package generate.httpclient;

import java.util.HashMap;
import java.util.Map;

public class HandlerFailThread  extends Thread{
Map<String, String> failUrl=new HashMap<String, String>();
public void putFailUrl(String url,String status){
synchronized (failUrl) {
failUrl.put(url,status);
}
}
@Override
public void run() {
while(true){

}
}
public void printFailUrl(){
for(Map.Entry<String, String> m: failUrl.entrySet()){
System.out.println("****fail:url:"+m.getKey()+ "  code :"+m.getValue());
}
}
}

异步请求，也可通过pool管理，例如

ConnectingIOReactor nio=new DefaultConnectingIOReactor();
PoolingClientAsyncConnectionManager manager=new PoolingClientAsyncConnectionManager(nio);
manager.setMaxTotal(1000);
manager.setDefaultMaxPerRoute(100);
HttpParams params=new BasicHttpParams();
/* 连接超时 */
HttpConnectionParams.setConnectionTimeout(params, 10000);
/* 请求超时 */
HttpConnectionParams.setSoTimeout(params, 60*1000);
DefaultHttpAsyncClient.setDefaultHttpParams(params);
final HttpAsyncClient httpclient = new DefaultHttpAsyncClient(manager);
httpclient.start();

HttpClient相关可参看，里面有很多说明与例子

http://hc.apache.org/httpcomponents-client-ga/tutorial/html/connmgmt.html