跨机器、跨语言的远程访问形式一共有三种：scoket发送数据包、http发送请求、rmi远程连接；
http发送请求方式；分为post和get两种方式
importjava.io.IOException;
importjava.io.InputStream;
import java.util.Map;
importjava.util.concurrent.atomic.AtomicInteger;
importorg.apache.commons.httpclient.HttpClient;
importorg.apache.commons.httpclient.HttpException;
importorg.apache.commons.httpclient.HttpStatus;
importorg.apache.commons.httpclient.MultiThreadedHttpConnectionManager;
importorg.apache.commons.httpclient.NameValuePair;
importorg.apache.commons.httpclient.methods.GetMethod;
importorg.apache.commons.httpclient.methods.PostMethod;
importorg.apache.commons.httpclient.params.HttpConnectionManagerParams;
importorg.apache.commons.io.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
publicclass SendHttpUrl {
privatefinalstatic Logger logger = LoggerFactory.getLogger(SendHttpUrl.class);
privatestatic HttpClient httpClient = null;
privatestaticMultiThreadedHttpConnectionManager connectionManager = null;// 多线程管理器
privateintmaxThreadsTotal = 128;// 最大线程数
privateintmaxThreadsPerHost = 32; // 分配给每个客户端的最大线程数
privateintconnectionTimeout = 15000;// 连接超时时间,毫秒
privateintsoTimeout = 14000;// 读取数据超时时间，毫秒
publicvoid init() {
connectionManager = newMultiThreadedHttpConnectionManager();
HttpConnectionManagerParams params = newHttpConnectionManagerParams();
params.setConnectionTimeout(connectionTimeout);
params.setMaxTotalConnections(maxThreadsTotal);
params.setSoTimeout(soTimeout);
if (maxThreadsTotal > maxThreadsPerHost) {
params.setDefaultMaxConnectionsPerHost(maxThreadsPerHost);
} else {
params.setDefaultMaxConnectionsPerHost(maxThreadsTotal);
}
connectionManager.setParams(params);
httpClient = new HttpClient(connectionManager);
httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(connectionTimeout);
httpClient.getHttpConnectionManager().getParams().setSoTimeout(soTimeout);
}
/**
* get方式访问
*
* @param url
* @param callType
* @param parmMap
* @return
*/
private String callByGet(Stringurl, String callType, Map<String, String> parmMap) {
if (logger.isDebugEnabled()){
logger.debug("in get,url:" + url);
}
GetMethod getMethod = new GetMethod(url);
int statusCode = 0;
try {
statusCode = httpClient.executeMethod(getMethod);
if (logger.isDebugEnabled()){
logger.debug("inget,statusCode:" + statusCode);
}
if (statusCode != HttpStatus.SC_OK) {
// 访问失败
logger.error("in get,访问appagent失败。网络问题。statusCode：" + statusCode);
returnnull;
}
InputStream inputStream = getMethod.getResponseBodyAsStream();
if (inputStream == null) {
// 访问正常：获取到的数据为空
logger.error("in get,从appagent返回的数据为空！");
returnnull;
}
String rtn = IOUtils.toString(inputStream, "utf-8");
return rtn;
} catch (HttpException e) {
logger.error("get方式访问appagent失败！", e);
returnnull;
} catch (IOException e) {
logger.error("get方式访问appagent失败！", e);
returnnull;
} finally {
getMethod.releaseConnection();
}
}
/**
* post方式访问
*
* @param url
* @param callType
* @param parmMap
* @return
*/
private String callByPost(Stringurl, String callType, Map<String, String> parmMap) {
if (logger.isDebugEnabled()){
logger.debug("inpost,url:" + url);
}
PostMethod p = new PostMethod(url);
if (parmMap != null) {
NameValuePair[] params = newNameValuePair[parmMap.size()];
AtomicInteger atomicInteger = new AtomicInteger(0);
for (Map.Entry<String, String> parm :parmMap.entrySet()) {
NameValuePair parmValue = newNameValuePair(parm.getKey(), parm.getValue());
params[atomicInteger.getAndIncrement()] = parmValue;
}
p.setRequestBody(params);
}
try {
int statusCode = httpClient.executeMethod(p);
logger.debug("inget,statusCode:" + statusCode);
if (statusCode != HttpStatus.SC_OK) {
// 异常
logger.error("in post,访问appagent失败。网络问题。statusCode：" + statusCode);
returnnull;
}
InputStream inputStream = p.getResponseBodyAsStream();
if (inputStream == null) {
// 访问正常
logger.error("in post,从appagent返回的数据为空！");
returnnull;
}
String rtn = IOUtils.toString(inputStream, "utf-8");
return rtn;
} catch (HttpException e) {
logger.error("post方式访问appagent失败！", e);
returnnull;
} catch (IOException e) {
logger.error("post方式访问appagent失败！", e);
returnnull;
} finally {
p.releaseConnection();
}
}
}