Android中使用httpClient实现HTTP请求

最新推荐文章于 2025-06-11 16:01:20 发布

原创最新推荐文章于 2025-06-11 16:01:20 发布 · 682 阅读

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文章标签：

#android #api请求 #http

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本文深入探讨了HTTP工具类的实现原理与具体应用，包括GET和POST请求的实现细节，以及如何设置HTTP请求参数。重点突出在Android环境下，如何高效地进行网络请求操作。

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import java.io.IOException;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.params.HttpClientParams;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.BasicHttpParams;
import org.apache.http.params.HttpConnectionParams;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.EntityUtils;

import android.util.Log;

/**
 * 
 * <http工具类>
 * <功能详细描述>
 */
public class HttpUtil
{
    /**
     * http请求对象
     */
    private static HttpClient httpClient; 
    
    /**
     * <设置http请求对象参数>
     * <功能详细描述>
     * @return
     * @see [类、类#方法、类#成员]
     */
    private static HttpClient getHttpClient() {  
        // 创建 HttpParams 以用来设置 HTTP 参数（这一部分不是必需的）  
        HttpParams httpParams = new BasicHttpParams();  
        // 设置连接超时和 Socket 超时，以及 Socket 缓存大小  
        HttpConnectionParams.setConnectionTimeout(httpParams, 20 * 1000);  
        HttpConnectionParams.setSoTimeout(httpParams, 20 * 1000);  
        HttpConnectionParams.setSocketBufferSize(httpParams, 8192);  
        // 设置重定向，缺省为 true  
        HttpClientParams.setRedirecting(httpParams, true);  
        // 设置 user agent  
        String userAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.2) Gecko/20100115 Firefox/3.6";  
        HttpProtocolParams.setUserAgent(httpParams, userAgent);  
        // 创建一个 HttpClient 实例  
        // 注意 HttpClient httpClient = new HttpClient(); 是Commons HttpClient  
        // 中的用法，在 Android 1.5 中我们需要使用 Apache 的缺省实现 DefaultHttpClient  
        httpClient = new DefaultHttpClient(httpParams);  
        return httpClient;  
    }
    
    /**
     * <get请求>
     * <功能详细描述>
     * @param url
     * @param params
     * @return
     * @see [类、类#方法、类#成员]
     */
    @SuppressWarnings("rawtypes")
    public static String doGet(String url, Map params) {  
        if(httpClient==null){
            getHttpClient();
        }
        /* 建立HTTPGet对象 */  
        String paramStr = "";  
        Iterator iter = params.entrySet().iterator();  
        while (iter.hasNext()) {  
            Map.Entry entry = (Map.Entry) iter.next();  
            Object key = entry.getKey();  
            Object val = entry.getValue();  
            paramStr += paramStr = "&" + key + "=" + val;  
        }  
        if (!paramStr.equals("")) {  
            paramStr = paramStr.replaceFirst("&", "?");  
            url += paramStr;  
        }  
        HttpGet httpRequest = new HttpGet(url);
        String strResult = "doGetError";  
        try {  
            /* 发送请求并等待响应 */  
            HttpResponse httpResponse = httpClient.execute(httpRequest);  
            /* 若状态码为200 ok */  
            if (httpResponse.getStatusLine().getStatusCode() == 200) {  
                /* 读返回数据 */  
                strResult = EntityUtils.toString(httpResponse.getEntity(),"utf-8");  
            } else {  
                strResult = "Error Response: "  
                        + httpResponse.getStatusLine().toString();  
            }  
        } catch (ClientProtocolException e) {  
            strResult = e.getMessage().toString();  
            e.printStackTrace();  
        } catch (IOException e) {  
            strResult = e.getMessage().toString();  
            e.printStackTrace();  
        } catch (Exception e) {  
            strResult = e.getMessage().toString();  
            e.printStackTrace();  
        }
        Log.v("strResult", strResult);  
        return strResult;  
    }  
    
    /**
     * <post请求>
     * <功能详细描述>
     * @param url
     * @param params
     * @return
     * @see [类、类#方法、类#成员]
     */
    public static String doPost(String url, List<NameValuePair> params) {  
        if(httpClient==null){
            getHttpClient();
        }
        /* 建立HTTPPost对象 */  
        HttpPost httpRequest = new HttpPost(url);  
        String strResult = "doPostError";  
        try {  
            /* 添加请求参数到请求对象 */  
            httpRequest.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));  
            /* 发送请求并等待响应 */  
            HttpResponse httpResponse = httpClient.execute(httpRequest);  
            /* 若状态码为200 ok */  
            if (httpResponse.getStatusLine().getStatusCode() == 200) {  
                /* 读返回数据 */  
                strResult = EntityUtils.toString(httpResponse.getEntity());  
            } else {  
                strResult = "Error Response: "  
                        + httpResponse.getStatusLine().toString();  
            }  
        } catch (ClientProtocolException e) {  
            strResult = e.getMessage().toString();  
            e.printStackTrace();  
        } catch (IOException e) {  
            strResult = e.getMessage().toString();  
            e.printStackTrace();  
        } catch (Exception e) {  
            strResult = e.getMessage().toString();  
            e.printStackTrace();  
        }  
        Log.v("strResult", strResult);  
        return strResult;  
    }  
}

总结：该方式已不被Android官方推荐使用