android eclipse 针对 Web 服务器设置 http POST 和 GET

Question

我需要帮助来使用 Eclipse 在 Android 中设置应用程序。

我以前没有使用过 eclipse 进行 JAVA 开发，所以我对如何将这一切与 android 结合在一起还有些陌生。

我下载了一个脚本来使用我的 Web 服务器进行测试，该服务器已设置为在访问时生成输出（此时为 JSON 命名值对）。

我正在使用-
面向 Java 开发人员的 Eclipse IDE
版本：Helios 服务版本 2
版本号：20110218-0911

Android 开发工具包
版本：10.0.1.v201103111512-110841

到目前为止的 JAVA 代码 -

package new.android.test;

import android.app.Activity;
import android.os.Bundle;
import java.io.ByteArrayInputStream;
import java.net.Socket;

import org.apache.http.ConnectionReuseStrategy;
import org.apache.http.HttpEntity;
import org.apache.http.HttpHost;
import org.apache.http.HttpRequestInterceptor;
import org.apache.http.HttpResponse;
import org.apache.http.HttpVersion;
import org.apache.http.entity.ByteArrayEntity;
import org.apache.http.entity.InputStreamEntity;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.DefaultConnectionReuseStrategy;
import org.apache.http.impl.DefaultHttpClientConnection;
import org.apache.http.message.BasicHttpEntityEnclosingRequest;
import org.apache.http.params.HttpParams;
import org.apache.http.params.HttpProtocolParams;
import org.apache.http.params.SyncBasicHttpParams;
import org.apache.http.protocol.HttpContext;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.protocol.ExecutionContext;
import org.apache.http.protocol.HttpProcessor;
import org.apache.http.protocol.HttpRequestExecutor;
import org.apache.http.protocol.ImmutableHttpProcessor;
import org.apache.http.protocol.RequestConnControl;
import org.apache.http.protocol.RequestContent;
import org.apache.http.protocol.RequestExpectContinue;
import org.apache.http.protocol.RequestTargetHost;
import org.apache.http.protocol.RequestUserAgent;
import org.apache.http.util.EntityUtils;

/**
 * Elemental example for executing a POST request.
 * <p>
 * Please note the purpose of this application is demonstrate the usage of HttpCore APIs.
 * It is NOT intended to demonstrate the most efficient way of building an HTTP client. 
 *
 *
 *
 */

public class search extends Activity {

    public static void main(String[] args) throws Exception {

        HttpParams params = new SyncBasicHttpParams();
        HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
        HttpProtocolParams.setContentCharset(params, "UTF-8");
        HttpProtocolParams.setUserAgent(params, "HttpComponents/1.1");
        HttpProtocolParams.setUseExpectContinue(params, true);

        HttpProcessor httpproc = new ImmutableHttpProcessor(new HttpRequestInterceptor[] {
                // Required protocol interceptors
                new RequestContent(),
                new RequestTargetHost(),
                // Recommended protocol interceptors
                new RequestConnControl(),
                new RequestUserAgent(),
                new RequestExpectContinue()});

        HttpRequestExecutor httpexecutor = new HttpRequestExecutor();

        HttpContext context = new BasicHttpContext(null);

        HttpHost host = new HttpHost("localhost", 80);

        DefaultHttpClientConnection conn = new DefaultHttpClientConnection();
        ConnectionReuseStrategy connStrategy = new DefaultConnectionReuseStrategy();

        context.setAttribute(ExecutionContext.HTTP_CONNECTION, conn);
        context.setAttribute(ExecutionContext.HTTP_TARGET_HOST, host);

        try {

            HttpEntity[] requestBodies = {
                    new StringEntity(
                            "This is the first test request", "UTF-8"),
                    new ByteArrayEntity(
                            "This is the second test request".getBytes("UTF-8")),
                    new InputStreamEntity(
                            new ByteArrayInputStream(
                                    "This is the third test request (will be chunked)"
                                    .getBytes("UTF-8")), -1)
            };

            for (int i = 0; i < requestBodies.length; i++) {
                if (!conn.isOpen()) {
                    Socket socket = new Socket(host.getHostName(), host.getPort());
                    conn.bind(socket, params);
                }
                BasicHttpEntityEnclosingRequest request = new BasicHttpEntityEnclosingRequest("POST", 
                        "/android.php");
                request.setEntity(requestBodies[i]);
                System.out.println(">> Request URI: " + request.getRequestLine().getUri());

                request.setParams(params);
                httpexecutor.preProcess(request, httpproc, context);
                HttpResponse response = httpexecutor.execute(request, conn, context);
                response.setParams(params);
                httpexecutor.postProcess(response, httpproc, context);

                System.out.println("<< Response: " + response.getStatusLine());
                System.out.println(EntityUtils.toString(response.getEntity()));
                System.out.println("==============");
                if (!connStrategy.keepAlive(response, context)) {
                    conn.close();
                } else {
                    System.out.println("Connection kept alive...");
                }
            }
        } finally {
            conn.close();
        }        
    }

}

好的主要问题是为什么有这么多导入？

此外，我还收到这些导入的错误：

The import org.apache.http.params.SyncBasicHttpParams cannot be resolved  
The import org.apache.http.protocol.ImmutableHttpProcessor cannot be resolved  

我在 android.jar 中看不到这些类。

是否有一个更简单的示例来实现针对 Web 服务器的事务以获取名称值对（JSON）以在 android java 应用程序中使用？

Answer 1

这些错误是因为您引用的类不是标准 Android 发行版的一部分：请参阅 http://developer.android.com/reference/org/apache/http/params/package-summary.html 和 http://developer.android.com/reference/org/apache /http/protocol/package-summary.html。

Android 重新打包了特定版本的 Apache HTTP 库。如果您想使用这些类，您需要包含这些罐子。