Android通过http中post方法上传数据

标签:android

在android中通过http post方法传递数据,核心的包是:

java.net.HttpURLConnection

另外还有是http header的设置,以及post中参数的设置。

详细的可以参考下面的代码:

package com.rubenxiao.blog;

import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.Map;

/**
 * Created by ruben on 18-9-18.
 */


public class HttpUtils {
    public static String submitPostData(Map<String, String> params, String encode) throws MalformedURLException {
        /**
         * 发送POST请求到服务器并返回服务器信息
         * @param params 请求体内容
         * @param encode 编码格式
         * @return 服务器返回信息
         */
        byte[] data = getRequestData(params, encode).toString().getBytes();
        URL url = new URL("http://172.16.1.226:5557/upload");
        HttpURLConnection httpURLConnection = null;
        try{
            httpURLConnection = (HttpURLConnection)url.openConnection();
            httpURLConnection.setConnectTimeout(3000);  // 设置连接超时时间
            httpURLConnection.setDoInput(true);         // 打开输入流,以便从服务器获取数据
            httpURLConnection.setDoOutput(true);        // 打开输出流,以便向服务器提交数据
            httpURLConnection.setRequestMethod("POST"); // 设置以POST方式提交数据
            httpURLConnection.setUseCaches(false);      // 使用POST方式不能使用缓存
            // 设置请求体的类型是文本类型
            httpURLConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            // 设置请求体的长度
            httpURLConnection.setRequestProperty("Content-Length", String.valueOf(data.length));
            // 获得输入流,向服务器写入数据
            OutputStream outputStream = new BufferedOutputStream(httpURLConnection.getOutputStream());
            outputStream.write(data);
            outputStream.flush();                       // 重要!flush()之后才会写入

            int response = httpURLConnection.getResponseCode();     // 获得服务器响应码
            if (response == HttpURLConnection.HTTP_OK) {
                InputStream inputStream = httpURLConnection.getInputStream();
                return dealResponseResult(inputStream);             // 处理服务器响应结果
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            httpURLConnection.disconnect();
        }

        return "";
    }

    /**
     * 封装请求体信息
     * @param params 请求体内容
     * @param encode 编码格式
     * @return 请求体信息
     */
    public static StringBuffer getRequestData(Map<String, String> params, String encode) {
        StringBuffer stringBuffer = new StringBuffer();            //存储封装好的请求体信息
        try {
            for (Map.Entry<String, String> entry : params.entrySet()) {
                stringBuffer.append(entry.getKey())
                        .append("=")
                        .append(URLEncoder.encode(entry.getValue(), encode))
                        .append("&");
            }
            stringBuffer.deleteCharAt(stringBuffer.length() - 1);   // 删除最后一个"&"
        } catch (Exception e) {
            e.printStackTrace();
        }
        return stringBuffer;
    }

    /**
     * 处理服务器的响应结果(将输入流转换成字符串)
     * @param inputStream 服务器的响应输入流
     * @return 服务器响应结果字符串
     */
    public static String dealResponseResult(InputStream inputStream) {
        String resultData = null;
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        byte[] data = new byte[1024];
        int len = 0;
        try {
            while ((len = inputStream.read(data)) != -1) {
                byteArrayOutputStream.write(data, 0, len);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        resultData = new String(byteArrayOutputStream.toByteArray());
        return resultData;
    }
}

使用方法:

String imgString = Base64.encodeToString(bytes, Base64.NO_WRAP);
Map<String, String> params = new HashMap<String, String>();
String post_result = null;
params.put("base64", imgString);
try {
    post_result = HttpUtils.submitPostData(params, "utf-8");
    Log.i("POST_RESULT", post_result);
    } catch (MalformedURLException e) {
        e.printStackTrace();
    }

原创文章,转载请注明出处!
本文链接:http://blog.youran.ai/posts/android-http-post.html
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