图片上传

UploadUtil

package com.atwal.util;

import android.util.Log;

import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.Map;
import java.util.UUID;

/**
 * Created by atwal on 2016/3/11.
 */
public class UploadUtil {
    private static final String TAG = "uploadFile";
    private static final int TIME_OUT = 10 * 1000;   //超时时间
    private static final String CHARSET = "utf-8";
    private static final String BOUNDARY = UUID.randomUUID().toString();  //边界标识随机生成
    private static final String PREFIX = "--";
    private static final String LINE_END = "
";
    private static final String CONTENT_TYPE = "multipart/form-data";   //内容类型

    /**
     * 上传文件
     * @param file 文件
     * @param RequestURL post地址
     * @param params 除文件外其他参数
     * @param uploadFieldName 上传文件key
     * @return
     */
    public static String uploadFile(File file, String RequestURL, Map<String, String> params, String uploadFieldName) {
        String result = null;

        try {
            URL url = new URL(RequestURL);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setReadTimeout(TIME_OUT);
            conn.setConnectTimeout(TIME_OUT);
            conn.setDoInput(true);
            conn.setDoOutput(true);
            conn.setUseCaches(false);
            conn.setRequestMethod("POST");
            conn.setRequestProperty("Charset", CHARSET);
            conn.setRequestProperty("connection", "keep-alive");
            conn.setRequestProperty("Content-Type", CONTENT_TYPE + ";boundary=" + BOUNDARY);

            DataOutputStream dos = new DataOutputStream(conn.getOutputStream());
            StringBuffer sb = new StringBuffer();
            sb.append(getRequestData(params));

            if (file != null) {
                sb.append(PREFIX);
                sb.append(BOUNDARY);
                sb.append(LINE_END);
                sb.append("Content-Disposition: form-data; name="" + uploadFieldName + ""; filename="" + file.getName() + """ + LINE_END);
                sb.append("Content-Type: application/octet-stream; charset=" + CHARSET + LINE_END);
                sb.append(LINE_END);
            }
            dos.write(sb.toString().getBytes());
            if (file != null) {
                InputStream is = new FileInputStream(file);
                byte[] bytes = new byte[1024];
                int len = 0;
                while ((len = is.read(bytes)) != -1) {
                    dos.write(bytes, 0, len);
                }
                is.close();
                dos.write(LINE_END.getBytes());
                byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINE_END).getBytes();
                dos.write(end_data);
            }
            dos.flush();

            int res = conn.getResponseCode();
            Log.e(TAG, "response code:" + res);
            if (res == 200) {
                Log.e(TAG, "request success");
                InputStream input = conn.getInputStream();
                StringBuffer sb1 = new StringBuffer();
                int ss;
                while ((ss = input.read()) != -1) {
                    sb1.append((char) ss);
                }
                result = sb1.toString();
                Log.i(TAG, "result : " + result);
            } else {
                Log.e(TAG, "request error");
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 对post参数进行编码处理
     * @param params post参数
     * @return
     */
    private static StringBuffer getRequestData(Map<String, String> params) {
        StringBuffer stringBuffer = new StringBuffer();
        try {
            for (Map.Entry<String, String> entry : params.entrySet()) {
                stringBuffer.append(PREFIX);
                stringBuffer.append(BOUNDARY);
                stringBuffer.append(LINE_END);
                stringBuffer.append("Content-Disposition: form-data; name="" + entry.getKey() + """ + LINE_END);
                stringBuffer.append(LINE_END);
                stringBuffer.append(URLEncoder.encode(entry.getValue(), CHARSET));
                stringBuffer.append(LINE_END);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return stringBuffer;
    }
}

调用

 String requestURL = "服务器地址";

String picPath = "图片地址";

File file = new File(picPath);

Log.i("upload", "file exists:" + file.exists());

if (file.exists()) {

Map<String, String> params = new HashMap<>();

params.put("id", "1");

//...如果有其他参数添加到这里

String request = UploadUtil.uploadFile(file, requestURL, params, "image");

Log.i("upload", request);

}