(转)ORACLE EXPLAIN PLAN的总结

本文出自：http://xiaofeng001.iteye.com/blog/982751

HttpClient V3和V4版本的区别还是蛮大的，没有细研究过V3，最近看了下V4，感觉很灵活，可定制性的东西很多。

=======================HttpClient3 属性设置========================

HttpClient client = new HttpClient();

HttpConnectionManagerParams cmp = client.getHttpConnectionManager().getParams();

cmp.setConnectionTimeout(5000);//http连接超时

cmp.setSoTimeout(5000);//读数据超时

client.getParams().setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET, "UTF-8");//编码

=======================HttpClient3 Post========================

PostMethod post = new PostMethod(url);

NameValuePair name$ = new NameValuePair("UserID","19104221");

NameValuePair authenticator$ = new NameValuePair("Authenticator",authenticator);

NameValuePair[] paramsPair = {name$,authenticator$};

post.addParameters(paramsPair);

int stateCode = client.executeMethod(post);

//TODO 处理响应

post.releaseConnection();

//post.abort();

((SimpleHttpConnectionManager)client.getHttpConnectionManager()).shutdown();

=======================HttpClient3 Get========================

GetMethod get = new GetMethod(url)

HttpMethodParams params = new HttpMethodParams();

params.setParameter("UserID", "99999005");

params.setParameter("Action", "Login");

get.setParams(params);

int statusCode = client.executeMethod(get);

//TODO 处理响应

get.releaseConnection();

//get.abort();

((SimpleHttpConnectionManager)client.getHttpConnectionManager()).shutdown();

========================HttpClient4属性设置===============================

DefaultHttpClient httpclient = new DefaultHttpClient();

httpclient.getParams().setParameter(CoreProtocolPNames.PROTOCOL_VERSION, HttpVersion.HTTP_1_1);

httpclient.getParams().setParameter(CoreProtocolPNames.USER_AGENT, "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1)");

httpclient.getParams().setParameter(CoreProtocolPNames.USE_EXPECT_CONTINUE, Boolean.FALSE);

httpclient.getParams().setParameter(CoreProtocolPNames.HTTP_CONTENT_CHARSET, charset == null ? CHARSET_GBK : charset);

httpclient.getParams().setIntParameter(CoreConnectionPNames.CONNECTION_TIMEOUT, connectTimeout);

httpclient.getParams().setIntParameter(CoreConnectionPNames.SO_TIMEOUT, readTimeout);

//httpclient.setHttpRequestRetryHandler(requestRetryHandler);//请求重试Handler

//httpclient.setRedirectHandler();//重定向的处理(默认的DefaultRedirectHandler能够支持get,head自动重定向)

if(responseInterceptor!=null)

httpclient.addResponseInterceptor(responseInterceptor);//响应拦截器

if(requestInterceptor!=null)

httpclient.addRequestInterceptor(requestInterceptor);//请求拦截器

========================HttpClient4 Get===============================

List<NameValuePair> qparams = getParamsList(params);

if (qparams != null && qparams.size() > 0) {

charset = (charset == null ? CHARSET_GBK : charset);

String formatParams = URLEncodedUtils.format(qparams, charset);

url = (url.indexOf("?")) < 0 ? (url + "?" + formatParams) : (url

.substring(0, url.indexOf("?") + 1) + formatParams);

}

DefaultHttpClient httpClient = getDefaultHttpClient();

HttpGet hg = new HttpGet(url);

String response = httpClient.execute(hg,new BasicResponseHandler());//BasicResponseHandler控制响应结果为String

//TODO 处理响应

hg.abort();

httpClient.getConnectionManager().shutdown();

httpClient=null;

========================HttpClient4 Post===============================

UrlEncodedFormEntity formEntity = new UrlEncodedFormEntity(getParamsList(params), charset);

DefaultHttpClient httpClient = getDefaultHttpClient();

HttpPost hp = new HttpPost(url);

if(formEntity!=null)

hp.setEntity(formEntity);

httpClient.execute(hp);

//TODO 处理响应

hg.abort();

httpClient.getConnectionManager().shutdown();

httpClient=null;

//Map结构的参数转为NameValuePair列表

public List<NameValuePair> getParamsList(Map<String, String> paramsMap) {

if (paramsMap == null || paramsMap.size() == 0) {

return null;

}

List<NameValuePair> params = new ArrayList<NameValuePair>();

for (Map.Entry<String, String> map : paramsMap.entrySet()) {

params.add(new BasicNameValuePair(map.getKey(), map.getValue()));

}

return params;

}