使用java得到网页编码格式

import java.net.MalformedURLException; import java.net.URL; import org.apache.commons.httpclient.Header; import org.apache.commons.httpclient.HeaderElement; import org.apache.commons.httpclient.HttpClient; import org.apache.commons.httpclient.NameValuePair; import org.apache.commons.httpclient.methods.GetMethod; import toptrack.tools.JQueryBase; /** * 得到网页编码格式 * @author dl */ public class JHtmlUpdateCheck { /**文本内容编码识别类*/ private static cpdetector.io.CodepageDetectorProxy detector = cpdetector.io.CodepageDetectorProxy.getInstance(); static { detector.add(new cpdetector.io.HTMLCodepageDetector(false)); detector.add(cpdetector.io.JChardetFacade.getInstance()); } /** *<br>方法说明：得到网页编码格式 *<br>输入参数：strUrl 网页链接; timeout 超时设置 *<br>返回类型：网页编码 */ public static String getEncoding(String strUrl, int timeout) { String strEncoding = null; HttpClient client = new HttpClient(); client.getHttpConnectionManager().getParams().setConnectionTimeout(timeout); GetMethod method = new GetMethod(strUrl); method.setFollowRedirects( true ); int statusCode; try { statusCode = client.executeMethod(method); if( statusCode != -1) { //从http头得到网页编码 strEncoding = getContentCharSet(method.getResponseHeader("Content-Type")); if (strEncoding != null) { method.releaseConnection(); return strEncoding; } //通过解析meta得到网页编码 String strHtml = method.getResponseBodyAsString().toLowerCase(); StringBuffer strBuffer = new StringBuffer(); int pos = JQueryBase.getTagText(strHtml, "<meta", ">", strBuffer, false, 0); while (strBuffer.length() > 0) { StringBuffer strEncodingBuffer = new StringBuffer(); JQueryBase.getTagText(strBuffer.toString(), "charset=", "“"", strEncodingBuffer, 0); if (strEncodingBuffer.length() > 0) { strEncoding = strEncodingBuffer.toString(); method.releaseConnection(); return strEncoding; } strBuffer = new StringBuffer(); pos = JQueryBase.getTagText(strHtml, "<meta", ">", strBuffer, false, pos); } //分析字节得到网页编码 strEncoding = getFileEncoding(strUrl, timeout); //设置默认网页字符编码 if (strEncoding == null) strEncoding = "GBK"; } method.releaseConnection(); } catch (Exception e) { // TODO Auto-generated catch block System.out.println(e.getClass() + "对" + strUrl + "提取网页编码信息出错"); return null; } return strEncoding; } /** *<br>方法说明：通过http头得到网页编码信息 *<br>输入参数：contentheade rhttp头 *<br>返回类型：网页编码 */ protected static String getContentCharSet(Header contentheader) { String charset = null; if (contentheader != null) { HeaderElement values[] = contentheader.getElements(); if (values.length == 1) { NameValuePair param = values[0].getParameterByName("charset"); if (param != null) { charset = param.getValue(); } } } return charset; }