HttpClient使用学习
import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; import org.apache.commons.httpclient. * ; import org.apache.commons.httpclient.auth.AuthScope; import org.apache.commons.httpclient.methods.PostMethod; import org.apache.commons.httpclient.methods.GetMethod; import java.util.Iterator; import java.util.Map; import java.net.SocketTimeoutException; import java.io.BufferedReader; import java.io.InputStreamReader; public class HttpInvoker { private Log logger = LogFactory.getLog(HttpInvoker.class); private static HttpInvoker httpInvoker = new HttpInvoker(); private HttpClient client = null; private String charset = "gbk"; private int timeout = 10000; private boolean useProxy = false; private String proxyHost = null; private int proxyPort; private String proxyUsername = null; private String proxyPassword = null; private boolean initialized = false; public static HttpInvoker getInstance() { return httpInvoker; } private HttpInvoker() { client = new HttpClient(new MultiThreadedHttpConnectionManager()); client.getParams().setParameter("http.protocol.content-charset", "gbk"); client.getParams().setContentCharset("gbk"); client.getParams().setSoTimeout(timeout); } public HttpInvoker(String charset, int timeout, boolean useProxy, String proxyHost, int proxyPort, String proxyUsername, String proxyPassword) { client = new HttpClient(new MultiThreadedHttpConnectionManager()); if (charset != null && !charset.trim().equals("")) { this.charset = charset; } if (timeout > 0) { this.timeout = timeout; } client.getParams().setParameter("http.protocol.content-charset", charset); client.getParams().setContentCharset(charset); client.getParams().setSoTimeout(timeout); if (useProxy && proxyHost != null && !proxyHost.trim().equals("") && proxyPort > 0) { HostConfiguration hc = new HostConfiguration(); hc.setProxy(proxyHost, proxyPort); client.setHostConfiguration(hc); if (proxyUsername != null && !proxyUsername.trim().equals("") && proxyPassword != null && !proxyPassword.trim().equals("")) { client.getState().setProxyCredentials(AuthScope.ANY, new UsernamePasswordCredentials(proxyUsername, proxyPassword)); } } initialized = true; logger.debug("HttpInvoker初始化完成"); } public synchronized void init() { if (charset != null && !charset.trim().equals("")) { client.getParams().setParameter("http.protocol.content-charset", charset); client.getParams().setContentCharset(charset); } if (timeout > 0) { client.getParams().setSoTimeout(timeout); } if (useProxy && proxyHost != null && !proxyHost.trim().equals("") && proxyPort > 0) { HostConfiguration hc = new HostConfiguration(); hc.setProxy(proxyHost, proxyPort); client.setHostConfiguration(hc); if (proxyUsername != null && !proxyUsername.trim().equals("") && proxyPassword != null && !proxyPassword.trim().equals("")) { client.getState().setProxyCredentials(AuthScope.ANY, new UsernamePasswordCredentials(proxyUsername, proxyPassword)); } } initialized = true; logger.debug("HttpInvoker初始化完成"); } public String invoke(String url)throws Exception { return invoke(url, null, false); } public String invoke(String url, Map params, boolean isPost)throws Exception { logger.debug("HTTP调用[" + (isPost ? "POST" : "GET") + "][" + url + "][" + params + "]"); HttpMethod httpMethod = null; String result = ""; try { if (isPost && params != null && params.size() > 0) { Iterator paramKeys = params.keySet().iterator(); httpMethod = new PostMethod(url); NameValuePair[]form = new NameValuePair[params.size()]; int formIndex = 0; while (paramKeys.hasNext()) { String key = (String)paramKeys.next(); Object value = params.get(key); if (value != null && value instanceof String && !value.equals("")) { form[formIndex] = new NameValuePair(key, (String)value); formIndex++; } else if (value != null && value instanceof String[] && ((String[])value).length > 0) { NameValuePair[]tempForm = new NameValuePair[form.length + ((String[])value).length - 1]; for (int i = 0; i < formIndex; i++) { tempForm[i] = form[i]; } form = tempForm; for (String v : (String[])value) { form[formIndex] = new NameValuePair(key, (String)v); formIndex++; } } } ((PostMethod)httpMethod).setRequestBody(form); } else { if (params != null && params.size() > 0) { Iterator paramKeys = params.keySet().iterator(); StringBuffer getUrl = new StringBuffer(url.trim()); if (url.trim().indexOf("?") > -1) { if (url.trim().indexOf("?") < url.trim().length() - 1 && url.trim().indexOf("&") < url.trim().length() - 1) { getUrl.append("&"); } } else { getUrl.append("?"); } while (paramKeys.hasNext()) { String key = (String)paramKeys.next(); Object value = params.get(key); if (value != null && value instanceof String && !value.equals("")) { getUrl.append(key).append("=").append(value).append("&"); } else if (value != null && value instanceof String[] && ((String[])value).length > 0) { for (String v : (String[])value) { getUrl.append(key).append("=").append(v).append("&"); } } } if (getUrl.lastIndexOf("&") == getUrl.length() - 1) { httpMethod = new GetMethod(getUrl.substring(0, getUrl.length() - 1)); } else { httpMethod = new GetMethod(getUrl.toString()); } } else { httpMethod = new GetMethod(url); } } client.executeMethod(httpMethod); // result = httpMethod.getResponseBodyAsString(); BufferedReader reader = new BufferedReader(new InputStreamReader( httpMethod.getResponseBodyAsStream(), "ISO-8859-1")); String line = null; String html = null; while ((line = reader.readLine()) != null) { if (html == null) { html = ""; } else { html += "\r\n"; } html += line; } if (html != null) { result = new String(html.getBytes("ISO-8859-1"), charset); } } catch (SocketTimeoutException e) { logger.error("连接超时[" + url + "]"); throw e; } catch (java.net.ConnectException e) { logger.error("连接失败[" + url + "]"); throw e; } catch (Exception e) { logger.error("连接时出现异常[" + url + "]"); throw e; } finally { if (httpMethod != null) { try { httpMethod.releaseConnection(); } catch (Exception e) { logger.error("释放网络连接失败[" + url + "]"); throw e; } } } return result; } public void setCharset(String charset) { this.charset = charset; } public void setTimeout(int timeout) { this.timeout = timeout; } public void setProxyHost(String proxyHost) { this.proxyHost = proxyHost; } public void setProxyPort(int proxyPort) { this.proxyPort = proxyPort; } public void setProxyUsername(String proxyUsername) { this.proxyUsername = proxyUsername; } public void setProxyPassword(String proxyPassword) { this.proxyPassword = proxyPassword; } public void setUseProxy(boolean useProxy) { this.useProxy = useProxy; } public synchronized boolean isInitialized() { return initialized; } }
使用方式:post
Map<String,String> params = new HashMap<String,String>(); params.put("check", check); String result = httpInvoker.invoke( "someURL", params, true);
使用方式:get
String content = httpInvoker.invoke(url);