本文使用的是httpClient實現傳送key_value引數、json引數，上傳單個檔案，上傳多個檔案的功能，是目前市面上很多網路請求封裝工具類的實現原理。

PostActivity：

import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import
 
 org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.entity.mime.MultipartEntity;
import org.apache.http.entity.mime.content.ContentBody;
import org.apache.http.entity.mime.content.FileBody;
import
 
 org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;

/**
 * @author CSDN_LQR
 * @工程 7ZipDemo 
 * @包名 com.lqr.zipdemo
 * @TODO
 
 使用httpClient實現發再key_value引數、json引數、上傳多個檔案
 */
public class PostActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_post);

        /* =============== post key_value =============== */
        findViewById(R.id.btnKeyValue).setOnClickListener(
                new OnClickListener() {

                    @Override
                    public void onClick(View v) {
                        HashMap<String, String> params = new HashMap<String, String>();
                        params.put("name", "SCDN_LQR");
                        // 傳送key_value形式的post請求
                        postKeyValue(params);
                    }
                });

        /* =============== post key_jsonString=============== */
        findViewById(R.id.btnJsonString).setOnClickListener(
                new OnClickListener() {

                    @Override
                    public void onClick(View v) {
                        String jsonString = "{\"name\":\"CSDN_LQR\"}";
                        postJsonString(jsonString);
                    }
                });

        /* =============== post key_File 單張圖片=============== */
        findViewById(R.id.btnSingleFile).setOnClickListener(
                new OnClickListener() {

                    @Override
                    public void onClick(View v) {
                        File file = new File("c:/a.txt");
                        postSingleFile(file);
                    }
                });

        /* =============== post key_File 多張圖片=============== */
        findViewById(R.id.btnMultFile).setOnClickListener(
                new OnClickListener() {

                    @Override
                    public void onClick(View v) {
                        Map<String, File> fileMap = new HashMap<String, File>();
                        File actimgFile = null;
                        File listimgFile = null;
                        fileMap.put("actimg", actimgFile);
                        fileMap.put("listimg", listimgFile);
                        postMultFile(fileMap);
                    }
                });

    }

    /**
     * 傳送多個檔案，需要httpmime.jar的支援
     * 
     * @param fileMap
     */
    private void postMultFile(final Map<String, File> fileMap) {

        new Thread(new Runnable() {

            @Override
            public void run() {
                try {
                    DefaultHttpClient httpClient = new DefaultHttpClient();
                    HttpPost post = new HttpPost("http://httpbin.org/post");

                    // 提交檔案型別的引數
                    MultipartEntity entity = new MultipartEntity();
                    for (Map.Entry<String, File> info : fileMap.entrySet()) {
                        File file = info.getValue();
                        String key = info.getKey();

                        ContentBody contentBody = new FileBody(file);
                        entity.addPart(key, contentBody);

                    }

                    post.setEntity(entity);

                    HttpResponse response = httpClient.execute(post);
                    if (response.getStatusLine().getStatusCode() == 200) {
                        HttpEntity resEntity = response.getEntity();
                        String result = EntityUtils.toString(resEntity);
                        System.out.println("result:" + result);
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }

            }
        }).start();

    }

    /**
     * 傳送單個檔案，需要httpmime.jar的支援
     * 
     * @param file
     */
    private void postSingleFile(final File file) {

        new Thread(new Runnable() {

            @Override
            public void run() {
                try {
                    DefaultHttpClient httpClient = new DefaultHttpClient();
                    HttpPost post = new HttpPost("http://httpbin.org/post");

                    // 提交檔案型別的引數
                    MultipartEntity entity = new MultipartEntity();
                    ContentBody contentBody = new FileBody(file);
                    entity.addPart("actimg", contentBody);

                    post.setEntity(entity);

                    HttpResponse response = httpClient.execute(post);
                    if (response.getStatusLine().getStatusCode() == 200) {
                        HttpEntity resEntity = response.getEntity();
                        String result = EntityUtils.toString(resEntity);
                        System.out.println("result:" + result);
                    }
                } catch (Exception e) {
                    e.printStackTrace();
                }

            }
        }).start();

    }

    /**
     * 傳送json形式的post請求
     * 
     * @param jsonString
     */
    private void postJsonString(final String jsonString) {
        new Thread() {
            public void run() {
                try {
                    DefaultHttpClient client = new DefaultHttpClient();
                    HttpPost post = new HttpPost("http://httpbin.org/post");

                    // 提交表單型別的引數
                    post.setEntity(new StringEntity(jsonString));

                    HttpResponse response = client.execute(post);

                    if (response.getStatusLine().getStatusCode() == 200) {
                        HttpEntity entity = response.getEntity();
                        System.out.println(EntityUtils.toString(entity));
                    }

                } catch (Exception e) {
                    // TODO
                    e.printStackTrace();
                }
            };
        }.start();
    }

    /**
     * 傳送key_value形式的post請求
     * 
     * @param paramsMap
     */
    private void postKeyValue(final Map<String, String> paramsMap) {

        new Thread() {
            public void run() {
                try {
                    DefaultHttpClient client = new DefaultHttpClient();

                    HttpPost post = new HttpPost("http://httpbin.org/post");

                    List<BasicNameValuePair> parameters = new ArrayList<BasicNameValuePair>();

                    for (Entry<String, String> entry : paramsMap.entrySet()) {
                        BasicNameValuePair basicNameValuePair = new BasicNameValuePair(
                                entry.getKey(), entry.getValue());
                        parameters.add(basicNameValuePair);
                    }

                    UrlEncodedFormEntity reqEntity = new UrlEncodedFormEntity(
                            parameters);
                    // 提交表單型別的引數
                    post.setEntity(reqEntity);

                    HttpResponse response = client.execute(post);

                    if (response.getStatusLine().getStatusCode() == 200) {
                        HttpEntity resEntity = response.getEntity();
                        System.out.println(EntityUtils.toString(resEntity));
                    }
                } catch (Exception e) {
                    // TODO
                    e.printStackTrace();
                }
            };
        }.start();
    }
}

activity_post.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <Button
        android:id="@+id/btnKeyValue"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="post_key_value" />


    <Button
        android:id="@+id/btnJsonString"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="post_jsonStirng" />

    <Button
        android:id="@+id/btnSingleFile"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="post_singleFile" />

    <Button
        android:id="@+id/btnMultFile"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="post_multFile" />

</LinearLayout>