本文實例講述了Java實現Http工具類的封裝操作。分享給大家供大家參考，具體如下：
http工具類的實現：（通過apache包）第一個類
import java.io.IOException;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.HttpStatus;import org.apache.http.client.ClientProtocolException;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpGet;import org.apache.http.util.EntityUtils;import com.gooagoo.stcu.utils.http.HttpClientUtils;public class HTTPRequest { private String errorMessage; // 信息/** * HTTP求字符串源* * @param url * URL地址* @return 字符串源* */ public String httpRequestString(String url) { String result = null; try { HttpEntity httpEntity = httpRequest(url); if (httpEntity != null) { result = EntityUtils.toString(httpEntity, "urf-8"); // 使用UTF-8 } } catch (IOException e) { errorMessage = e.getMessage(); } return result; } /** * HTTP求字源* * @param url * URL地址* @return 字源* */ public byte[] httpRequestByteArray(String url) { byte[] result = null; try { HttpEntity httpEntity = httpRequest(url); if (httpEntity != null) { result = EntityUtils.toByteArray(httpEntity); } } catch (IOException e) { errorMessage = e.getMessage(); } return result; } /** * 使用HTTP GET方式求* * @param url * URL地址* @return HttpEntiry象* */ private HttpEntity httpRequest(String url) { HttpEntity result = null; try { HttpGet httpGet = new HttpGet(url); HttpClient httpClient = HttpClientUtils.getHttpClient(); HttpResponse httpResponse; httpResponse = httpClient.execute(httpGet); int httpStatusCode = httpResponse.getStatusLine().getStatusCode(); /* * 判HTTP是否200 */ if (httpStatusCode == HttpStatus.SC_OK) { result = httpResponse.getEntity(); } else { errorMessage = "HTTP: " + httpStatusCode; } } catch (ClientProtocolException e) { errorMessage = e.getMessage(); } catch (IOException e) { errorMessage = e.getMessage(); } return result; } /** * 返回消息* * @return 信息* */ public String getErrorMessage() { return this.errorMessage; }}第二個類的實現：
package com.demo.http;import java.net.UnknownHostException;import java.util.ArrayList;import java.util.HashMap;import java.util.Iterator;import java.util.List;import java.util.Map;import java.util.Map.Entry;import org.apache.http.HttpResponse;import org.apache.http.HttpStatus;import org.apache.http.NameValuePair;import org.apache.http.client.HttpClient;import org.apache.http.client.entity.UrlEncodedFormEntity;import org.apache.http.client.methods.HttpPost;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.message.BasicNameValuePair;import org.apache.http.params.BasicHttpParams;import org.apache.http.params.HttpConnectionParams;import org.apache.http.protocol.HTTP;import org.apache.http.util.EntityUtils;public class HttpClientUtils { private static final int REQUEST_TIMEOUT = 5 * 1000;// 設置請求超時10秒鐘private static final int SO_TIMEOUT = 10 * 1000; // 設置等待數據超時時間10秒鐘// static ParseXml parseXML = new ParseXml(); // 初始化HttpClient，並設置超時public static HttpClient getHttpClient() { BasicHttpParams httpParams = new BasicHttpParams(); HttpConnectionParams.setConnectionTimeout(httpParams, REQUEST_TIMEOUT); HttpConnectionParams.setSoTimeout(httpParams, SO_TIMEOUT); HttpClient client = new DefaultHttpClient(httpParams); return client; } public static boolean doPost(String url) throws Exception { HttpClient client = getHttpClient(); HttpPost httppost = new HttpPost(url); HttpResponse response; response = client.execute(httppost); if (HttpStatus.SC_OK == response.getStatusLine().getStatusCode()) { return true; } client.getConnectionManager().shutdown(); return false; } /** * 與遠程交互的返回值post方式* * @param hashMap * @param url * @return */ public static String getHttpXml(HashMap<String, String> hashMap, String url) { String responseMsg = ""; HttpPost request = new HttpPost(url); List<NameValuePair> params = new ArrayList<NameValuePair>(); Iterator<Map.Entry<String, String>> iter = hashMap.entrySet() .iterator(); while (iter.hasNext()) { Entry<String, String> entry = iter.next(); params.add(new BasicNameValuePair(entry.getKey(), entry.getValue())); } try { request.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8)); HttpClient client = HttpClientUtils.getHttpClient(); HttpResponse response = client.execute(request); if (response.getStatusLine().getStatusCode() == 200) { responseMsg = EntityUtils.toString(response.getEntity()); } } catch (UnknownHostException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } return responseMsg; } /** * map轉字符串拼接參數* * @param hashMap * @return */ public static String mapToString(HashMap<String, String> hashMap) { String parameStr = ""; Iterator<Map.Entry<String, String>> iter = hashMap.entrySet() .iterator(); while (iter.hasNext()) { Entry<String, String> entry = iter.next(); parameStr += "&" + entry.getKey() + "=" + entry.getValue(); } if (parameStr.contains("&")) { parameStr = parameStr.replaceFirst("&", "?"); } return parameStr; }}更多關於java相關內容感興趣的讀者可查看本站專題：《Java Socket編程技巧總結》、《Java文件與目錄操作技巧匯總》、《Java數據結構與算法教程》、《Java操作DOM節點技巧總結》和《Java緩存操作技巧匯總》
希望本文所述對大家java程序設計有所幫助。