HttpClient :

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最近要 抓取其他网站的数据， 尝试了 HttpClient

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http://hc.apache.org/? ?官网提供了很详细了的 例子

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尝试连接的次数

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HttpRequestRetryHandler myRetryHandler = new ?HttpRequestRetryHandler() {?

public boolean retryRequest(IOException exception, int executionCount,HttpContext context) {?

System.out.println("尝试连接次数：-------："+executionCount);

if (executionCount >= 5) {?

// 如果超过最大重试次数，那么就不要继续了?

return false;?

}?

if (exception instanceof NoHttpResponseException) {?

// 如果服务器丢掉了连接，那么就重试?

return true;?

}?

if (exception instanceof SSLHandshakeException) {?

// 不要重试SSL握手异常?

return false;?

}?

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HttpRequest request = (HttpRequest) context.getAttribute(

ExecutionContext.HTTP_REQUEST);?

boolean idempotent = !(request instanceof?

HttpEntityEnclosingRequest);?

if (idempotent) {?

// 如果请求被认为是幂等的，那么就重试?

return true;?

}

return false;?

}?

};?

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GET:

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@Test

public void test_OOC(){

DefaultHttpClient httpclient = new DefaultHttpClient();

try {

//设置

httpclient.setHttpRequestRetryHandler(myRetryHandler);?

List<NameValuePair> formparams = new?

ArrayList<NameValuePair>();?

formparams.add(new BasicNameValuePair("eltype", "ct"));?

formparams.add(new BasicNameValuePair("cont_no", "XXX"));?

URI uri = URIUtils.createURI("http", "www.XXXX.com", -1,

"XXXXXXX",?

URLEncodedUtils.format(formparams, "UTF-8"), null);?

HttpGet httpget = new HttpGet(uri);

System.out.println(httpget.getURI());

//获得String 的方法

ResponseHandler<String> responseHandler = new BasicResponseHandler();