/**
* 请求
*
* @date 2013-1-7 上午11:08:54
* @param toFetchURL
* @return
*/
public FetchResult request(FetchRequest req) throws Exception {
FetchResult fetchResult = new FetchResult();
HttpUriRequest request = null;
HttpEntity entity = null;
String toFetchURL = req.getUrl();
boolean isPost = false;
try {
if (Http.Method.GET.equalsIgnoreCase(req.getHttpMethod())) request = new HttpGet(toFetchURL);
else if (Http.Method.POST.equalsIgnoreCase(req.getHttpMethod())) {
request = new HttpPost(toFetchURL);
isPost = true;
} else if (Http.Method.PUT.equalsIgnoreCase(req.getHttpMethod()))
request = new HttpPut(toFetchURL);
else if (Http.Method.HEAD.equalsIgnoreCase(req.getHttpMethod()))
request = new HttpHead(toFetchURL);
else if (Http.Method.OPTIONS.equalsIgnoreCase(req.getHttpMethod()))
request = new HttpOptions(toFetchURL);
else if (Http.Method.DELETE.equalsIgnoreCase(req.getHttpMethod()))
request = new HttpDelete(toFetchURL);
else throw new Exception("Unknown http method name");
// 同步信号量,在真正对服务端进行访问之前进行访问间隔的控制
// TODO 针对每个请求有一个delay的参数设置
synchronized (mutex) {
// 获取当前时间
long now = (new Date()).getTime();
// 对同一个Host抓取时间间隔进行控制，若在设置的时限内则进行休眠
if (now - lastFetchTime < config.getPolitenessDelay())
Thread.sleep(config.getPolitenessDelay() - (now - lastFetchTime));
// 不断更新最后的抓取时间，注意，是针对HOST的，不是针对某个URL的
lastFetchTime = (new Date()).getTime();
}
// 设置请求GZIP压缩，注意，前面必须设置GZIP解压缩处理
request.addHeader("Accept-Encoding", "gzip");
for (Iterator<Entry<String, String>> it = headers.entrySet().iterator(); it.hasNext(); ) {
Entry<String, String> entry = it.next();
request.addHeader(entry.getKey(), entry.getValue());
}
// 记录请求信息
Header[] headers = request.getAllHeaders();
for (Header h : headers) {
Map<String, List<String>> hs = req.getHeaders();
String key = h.getName();
List<String> val = hs.get(key);
if (val == null) val = new ArrayList<String>();
val.add(h.getValue());
hs.put(key, val);
}
req.getCookies().putAll(this.cookies);
fetchResult.setReq(req);
HttpEntity reqEntity = null;
if (Http.Method.POST.equalsIgnoreCase(req.getHttpMethod())
|| Http.Method.PUT.equalsIgnoreCase(req.getHttpMethod())) {
if (!req.getFiles().isEmpty()) {
reqEntity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);
for (Iterator<Entry<String, List<File>>> it = req.getFiles().entrySet().iterator();
it.hasNext(); ) {
Entry<String, List<File>> e = it.next();
String paramName = e.getKey();
for (File file : e.getValue()) {
// For File parameters
((MultipartEntity) reqEntity).addPart(paramName, new FileBody(file));
}
}
for (Iterator<Entry<String, List<Object>>> it = req.getParams().entrySet().iterator();
it.hasNext(); ) {
Entry<String, List<Object>> e = it.next();
String paramName = e.getKey();
for (Object paramValue : e.getValue()) {
// For usual String parameters
((MultipartEntity) reqEntity)
.addPart(
paramName,
new StringBody(
String.valueOf(paramValue), "text/plain", Charset.forName("UTF-8")));
}
}
} else {
List<NameValuePair> params = new ArrayList<NameValuePair>(req.getParams().size());
for (Iterator<Entry<String, List<Object>>> it = req.getParams().entrySet().iterator();
it.hasNext(); ) {
Entry<String, List<Object>> e = it.next();
String paramName = e.getKey();
for (Object paramValue : e.getValue()) {
params.add(new BasicNameValuePair(paramName, String.valueOf(paramValue)));
}
}
reqEntity = new UrlEncodedFormEntity(params, HTTP.UTF_8);
}
if (isPost) ((HttpPost) request).setEntity(reqEntity);
else ((HttpPut) request).setEntity(reqEntity);
}
// 执行请求，获取服务端返回内容
HttpResponse response = httpClient.execute(request);
headers = response.getAllHeaders();
for (Header h : headers) {
Map<String, List<String>> hs = fetchResult.getHeaders();
String key = h.getName();
List<String> val = hs.get(key);
if (val == null) val = new ArrayList<String>();
val.add(h.getValue());
hs.put(key, val);
}
// 设置已访问URL
fetchResult.setFetchedUrl(toFetchURL);
String uri = request.getURI().toString();
if (!uri.equals(toFetchURL))
if (!URLCanonicalizer.getCanonicalURL(uri).equals(toFetchURL))
fetchResult.setFetchedUrl(uri);
entity = response.getEntity();
// 服务端返回的状态码
int statusCode = response.getStatusLine().getStatusCode();
if (statusCode != HttpStatus.SC_OK) {
if (statusCode != HttpStatus.SC_NOT_FOUND) {
Header locationHeader = response.getFirstHeader("Location");
// 如果是301、302跳转，获取跳转URL即可返回
if (locationHeader != null
&& (statusCode == HttpStatus.SC_MOVED_PERMANENTLY
|| statusCode == HttpStatus.SC_MOVED_TEMPORARILY))
fetchResult.setMovedToUrl(
URLCanonicalizer.getCanonicalURL(locationHeader.getValue(), toFetchURL));
}
// 只要不是OK的除了设置跳转URL外设置statusCode即可返回
// 判断是否有忽略状态码的设置
if (this.site.getSkipStatusCode() != null
&& this.site.getSkipStatusCode().trim().length() > 0) {
String[] scs = this.site.getSkipStatusCode().split(",");
for (String code : scs) {
int c = CommonUtil.toInt(code);
// 忽略此状态码，依然解析entity
if (statusCode == c) {
assemPage(fetchResult, entity);
break;
}
}
}
fetchResult.setStatusCode(statusCode);
return fetchResult;
}
// 处理服务端返回的实体内容
if (entity != null) {
fetchResult.setStatusCode(statusCode);
assemPage(fetchResult, entity);
return fetchResult;
}
} catch (Throwable e) {
fetchResult.setFetchedUrl(e.toString());
fetchResult.setStatusCode(Status.INTERNAL_SERVER_ERROR.ordinal());
return fetchResult;
} finally {
try {
if (entity == null && request != null) request.abort();
} catch (Exception e) {
throw e;
}
}
fetchResult.setStatusCode(Status.UNSPECIFIED_ERROR.ordinal());
return fetchResult;
}
private void assemPage(FetchResult fetchResult, HttpEntity entity) throws Exception {
Page page = load(entity);
page.setUrl(fetchResult.getFetchedUrl());
fetchResult.setPage(page);
}
/**
* 抓取目标url的内容
*
* @date 2013-1-7 上午11:08:54
* @param toFetchURL
* @return
*/
public FetchResult fetch(FetchRequest req) throws Exception {
if (req.getHttpMethod() != null && !Http.Method.GET.equals(req.getHttpMethod())) {
// 获取到URL后面的QueryParam
String query = new URL(req.getUrl()).getQuery();
for (String q : query.split("\\&")) {
String[] qv = q.split("=");
String name = qv[0];
String val = qv[1];
List<Object> vals = req.getParams().get(name);
if (vals == null) {
vals = new ArrayList<Object>();
req.getParams().put(name, vals);
}
vals.add(val);
}
return request(req);
}
FetchResult fetchResult = new FetchResult();
HttpGet get = null;
HttpEntity entity = null;
String toFetchURL = req.getUrl();
try {
get = new HttpGet(toFetchURL);
// 设置请求GZIP压缩，注意，前面必须设置GZIP解压缩处理
get.addHeader("Accept-Encoding", "gzip");
for (Iterator<Entry<String, String>> it = headers.entrySet().iterator(); it.hasNext(); ) {
Entry<String, String> entry = it.next();
get.addHeader(entry.getKey(), entry.getValue());
}
// 同步信号量,在真正对服务端进行访问之前进行访问间隔的控制
// TODO 针对每个请求有一个delay的参数设置
synchronized (mutex) {
// 获取当前时间
long now = (new Date()).getTime();
// 对同一个Host抓取时间间隔进行控制，若在设置的时限内则进行休眠
if (now - lastFetchTime < config.getPolitenessDelay())
Thread.sleep(config.getPolitenessDelay() - (now - lastFetchTime));
// 不断更新最后的抓取时间，注意，是针对HOST的，不是针对某个URL的
lastFetchTime = (new Date()).getTime();
}
// 记录get请求信息
Header[] headers = get.getAllHeaders();
for (Header h : headers) {
Map<String, List<String>> hs = req.getHeaders();
String key = h.getName();
List<String> val = hs.get(key);
if (val == null) val = new ArrayList<String>();
val.add(h.getValue());
hs.put(key, val);
}
req.getCookies().putAll(this.cookies);
fetchResult.setReq(req);
// 执行get访问，获取服务端返回内容
HttpResponse response = httpClient.execute(get);
headers = response.getAllHeaders();
for (Header h : headers) {
Map<String, List<String>> hs = fetchResult.getHeaders();
String key = h.getName();
List<String> val = hs.get(key);
if (val == null) val = new ArrayList<String>();
val.add(h.getValue());
hs.put(key, val);
}
// 设置已访问URL
fetchResult.setFetchedUrl(toFetchURL);
String uri = get.getURI().toString();
if (!uri.equals(toFetchURL))
if (!URLCanonicalizer.getCanonicalURL(uri).equals(toFetchURL))
fetchResult.setFetchedUrl(uri);
entity = response.getEntity();
// 服务端返回的状态码
int statusCode = response.getStatusLine().getStatusCode();
if (statusCode != HttpStatus.SC_OK) {
if (statusCode != HttpStatus.SC_NOT_FOUND) {
Header locationHeader = response.getFirstHeader("Location");
// 如果是301、302跳转，获取跳转URL即可返回
if (locationHeader != null
&& (statusCode == HttpStatus.SC_MOVED_PERMANENTLY
|| statusCode == HttpStatus.SC_MOVED_TEMPORARILY))
fetchResult.setMovedToUrl(
URLCanonicalizer.getCanonicalURL(locationHeader.getValue(), toFetchURL));
}
// 只要不是OK的除了设置跳转URL外设置statusCode即可返回
// 判断是否有忽略状态码的设置
if (this.site.getSkipStatusCode() != null
&& this.site.getSkipStatusCode().trim().length() > 0) {
String[] scs = this.site.getSkipStatusCode().split(",");
for (String code : scs) {
int c = CommonUtil.toInt(code);
// 忽略此状态码，依然解析entity
if (statusCode == c) {
assemPage(fetchResult, entity);
break;
}
}
}
fetchResult.setStatusCode(statusCode);
return fetchResult;
}
// 处理服务端返回的实体内容
if (entity != null) {
fetchResult.setStatusCode(statusCode);
assemPage(fetchResult, entity);
return fetchResult;
}
} catch (Throwable e) {
fetchResult.setFetchedUrl(e.toString());
fetchResult.setStatusCode(Status.INTERNAL_SERVER_ERROR.ordinal());
return fetchResult;
} finally {
try {
if (entity == null && get != null) get.abort();
} catch (Exception e) {
throw e;
}
}
fetchResult.setStatusCode(Status.UNSPECIFIED_ERROR.ordinal());
return fetchResult;
}