Android使用HttpClient发送请求

在Android中发送请求可以使用HttpClient库。以下是一个使用HttpClient发送GET请求的示例代码：

import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.util.ArrayList;import java.util.List;import org.apache.http.HttpEntity;import org.apache.http.HttpResponse;import org.apache.http.NameValuePair;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.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.params.HttpParams;import org.apache.http.protocol.HTTP;public class HttpClientExample {    private static final int CONNECTION_TIMEOUT = 5000;    private static final int SOCKET_TIMEOUT = 5000;    public static String sendGetRequest(String url) throws IOException {        // 创建HttpClient对象        HttpClient httpClient = new DefaultHttpClient();        // 创建HttpGet对象，并设置URL        HttpGet httpGet = new HttpGet(url);                // 设置超时时间        HttpParams httpParams = new BasicHttpParams();        HttpConnectionParams.setConnectionTimeout(httpParams, CONNECTION_TIMEOUT);        HttpConnectionParams.setSoTimeout(httpParams, SOCKET_TIMEOUT);        httpClient.setParams(httpParams);        // 发送GET请求并获取响应        HttpResponse httpResponse = httpClient.execute(httpGet);        HttpEntity httpEntity = httpResponse.getEntity();        InputStream inputStream = httpEntity.getContent();        // 将响应转换为字符串        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));        StringBuilder stringBuilder = new StringBuilder();        String line;        while ((line = bufferedReader.readLine()) != null) {            stringBuilder.append(line);        }        bufferedReader.close();        inputStream.close();        return stringBuilder.toString();    }    public static String sendPostRequest(String url, List<NameValuePair> params) throws IOException {        // 创建HttpClient对象        HttpClient httpClient = new DefaultHttpClient();        // 创建HttpPost对象，并设置URL        HttpPost httpPost = new HttpPost(url);        // 设置超时时间        HttpParams httpParams = new BasicHttpParams();        HttpConnectionParams.setConnectionTimeout(httpParams, CONNECTION_TIMEOUT);        HttpConnectionParams.setSoTimeout(httpParams, SOCKET_TIMEOUT);        httpClient.setParams(httpParams);        // 设置POST请求的参数        httpPost.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));        // 发送POST请求并获取响应        HttpResponse httpResponse = httpClient.execute(httpPost);        HttpEntity httpEntity = httpResponse.getEntity();        InputStream inputStream = httpEntity.getContent();        // 将响应转换为字符串        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream));        StringBuilder stringBuilder = new StringBuilder();        String line;        while ((line = bufferedReader.readLine()) != null) {            stringBuilder.append(line);        }        bufferedReader.close();        inputStream.close();        return stringBuilder.toString();    }}

你可以使用sendGetRequest()方法发送GET请求，使用sendPostRequest()方法发送POST请求。传递的URL参数和POST请求的参数可以使用NameValuePair对象传递。