Java实现Http工具类的封装操作示例

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; // 錯誤信息  /**   * HTTP請求字符串資源   *   * @param url   *      URL地址   * @return 字符串資源   * */  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編碼      }    } catch (IOException e) {      errorMessage = e.getMessage();    }    return result;  }  /**   * HTTP請求字節數組資源   *   * @param url   *      URL地址   * @return 字節數組資源   * */  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方式請求   *   * @param url   *      URL地址   * @return HttpEntiry對象   * */  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();      /*       * 判斷HTTP狀態碼是否為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;  }  /**   * 返回錯誤消息   *   * @return 錯誤信息   * */  public String getErrorMessage() {    return this.errorMessage;  }}

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;// 设置请求超时10秒钟  private static final int SO_TIMEOUT = 10 * 1000; // 设置等待数据超时时间10秒钟  // static ParseXml parseXML = new ParseXml();  // 初始化HttpClient，并设置超时  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;  }  /**   * 与远程交互的返回值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转字符串 拼接参数   *   * @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;  }}