使用MultipartEntity上传图片文件

自己写一个MultipartEntity:

public class MultipartEntity  {private final static char[] MULTIPART_CHARS = "-_1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"        .toCharArray();/** * 换行符 */private final String NEW_LINE_STR = "\r\n";private final String CONTENT_TYPE = "Content-Type: ";private final String CONTENT_DISPOSITION = "Content-Disposition: ";/** * 文本参数和字符集 */private final String TYPE_TEXT_CHARSET = "text/plain; charset=UTF-8";/** * GZIP字节流参数 */private final String TYPE_GZIP = "application/gzip";/** * 字节流参数 */private final String TYPE_OCTET_STREAM = "application/octet-stream";/** * 二进制参数 */private final byte[] BINARY_ENCODING = "Content-Transfer-Encoding: binary\r\n\r\n".getBytes();/** * 文本参数 */private final byte[] BIT_ENCODING = "Content-Transfer-Encoding: 8bit\r\n\r\n".getBytes();/** * 分隔符 */private String mBoundary = null;/** * 输出流 */private ByteArrayOutputStream mOutputStream = new ByteArrayOutputStream();public MultipartEntity() {    this.mBoundary = generateBoundary();}/** * 生成分隔符 * * @return */private String generateBoundary() {    final StringBuffer buf = new StringBuffer();    final Random rand = new Random();    for (int i = 0; i < 30; i++) {        buf.append(MULTIPART_CHARS[rand.nextInt(MULTIPART_CHARS.length)]);    }    return buf.toString();}/** * 参数开头的分隔符 * * @throws IOException */private void writeFirstBoundary() throws IOException {    mOutputStream.write(("--" + mBoundary + "\r\n").getBytes());}/** * 添加文本参数 * * @param paramName * @param value */public void addStringPart(final String paramName, final String value) {    writeToOutputStream(paramName, value.getBytes(), TYPE_TEXT_CHARSET, BIT_ENCODING, "");}/** * 将数据写入到输出流中 * * @param paramName * @param rawData * @param type * @param encodingBytes * @param fileName */private void writeToOutputStream(String paramName, byte[] rawData, String type,                                 byte[] encodingBytes,                                 String fileName) {    try {        writeFirstBoundary();        mOutputStream.write((CONTENT_TYPE + type + NEW_LINE_STR).getBytes());        mOutputStream                .write(getContentDispositionBytes(paramName, fileName));        mOutputStream.write(encodingBytes);        mOutputStream.write(rawData);        mOutputStream.write(NEW_LINE_STR.getBytes());    } catch (final IOException e) {        e.printStackTrace();    }}/** * 添加二进制参数, 例如Bitmap的字节流参数 * * @param paramName * @param rawData */public void addBinaryPart(String paramName, final byte[] rawData,String fileName) {    writeToOutputStream(paramName, rawData, TYPE_OCTET_STREAM, BINARY_ENCODING, fileName);}/** * 添加文件参数,可以实现文件上传功能 * * @param key * @param file */public void addFilePart(final String key, final File file) {    FileInputStream fin = null;    try {        fin = new FileInputStream(file);        writeFirstBoundary();        final String type;        String fileName = file.getName();        boolean isGzip=fileName.endsWith(".gz");        if (isGzip) {            type = CONTENT_TYPE + TYPE_GZIP + NEW_LINE_STR;        }else{            type = CONTENT_TYPE + TYPE_OCTET_STREAM + NEW_LINE_STR;        }        mOutputStream.write(getContentDispositionBytes(key, file.getName()));        mOutputStream.write(type.getBytes());        mOutputStream.write(BINARY_ENCODING);        final byte[] tmp = new byte[4096];        int len = 0;        while ((len = fin.read(tmp)) != -1) {            mOutputStream.write(tmp, 0, len);        }        if(isGzip){            mOutputStream.write(NEW_LINE_STR.getBytes());        }        mOutputStream.flush();    } catch (final IOException e) {        e.printStackTrace();    } finally {        closeSilently(fin);    }}private void closeSilently(Closeable closeable) {    try {        if (closeable != null) {            closeable.close();        }    } catch (final IOException e) {        e.printStackTrace();    }}private byte[] getContentDispositionBytes(String paramName, String fileName) {    StringBuilder stringBuilder = new StringBuilder();    stringBuilder.append(CONTENT_DISPOSITION + "form-data; name=\"" + paramName + "\"");    // 文本参数没有filename参数,设置为空即可    if (!TextUtils.isEmpty(fileName)) {        stringBuilder.append("; filename=\""                + fileName + "\"");    }       return stringBuilder.append(NEW_LINE_STR).toString().getBytes();}public String getContentType() {    return "multipart/form-data; boundary=" + mBoundary;//        return new BasicHeader("Content-Type", "multipart/form-data; boundary=" + mBoundary);}public void writeTo(final OutputStream outstream) throws IOException {    // 参数最末尾的结束符    final String endString = "--" + mBoundary + "--\r\n";    // 写入结束符    mOutputStream.write(endString.getBytes());    //    outstream.write(getOutputBytes());}public InputStream getContent() {    return new ByteArrayInputStream(getOutputBytes());}private byte[] getOutputBytes() {    return mOutputStream.toByteArray();    }}

上传图片工具类:

public class FileImageUpload {private static final String TAG = FileImageUpload.class.getSimpleName();public static String uploadFile(File file, String requestURL, String cookie) {    LogUtils.d(TAG, "updateAvatar requestURL = " + requestURL + "; \n cookie = " + cookie);    String result = "";    MultipartEntity multiPart = new MultipartEntity();    HttpURLConnection conn = null;    OutputStream output;    try {        URL url = new URL(requestURL);        conn = (HttpURLConnection) url.openConnection();        conn.setReadTimeout(30 * 1000);        conn.setDoInput(true);// 允许输入        conn.setDoOutput(true);// 允许输出        conn.setUseCaches(false); // 不允许使用缓存        conn.setRequestMethod("POST");        conn.addRequestProperty("Cookie", cookie);        conn.addRequestProperty("Content-Type", multiPart.getContentType());        conn.connect();        output = conn.getOutputStream();        Bitmap bitmap = BitmapFactory.decodeFile(file.getAbsolutePath());        ByteArrayOutputStream bao = new ByteArrayOutputStream();        bitmap.compress(Bitmap.CompressFormat.JPEG, 100, bao);        multiPart.addBinaryPart("file", bao.toByteArray(), "abc.jpg");        multiPart.addStringPart("appid", "100106");        // 写入multipart        multiPart.writeTo(output);        output.flush();        int res = conn.getResponseCode();        if (res == 200) {            InputStream in = conn.getInputStream();            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(in, "UTF-8"));            StringBuffer buffer = new StringBuffer();            String line;            while ((line = bufferedReader.readLine()) != null) {                buffer.append(line);            }            result = buffer.toString();            in.close();        }        output.close();    } catch (Exception e) {        LogUtils.d(TAG, "uploadAvatar ClientProtocolException = " + e.toString());        result = e.getMessage();    } finally {        if (conn != null) {            conn.disconnect();        }    }    return result;    }}

Relate：
android upload image using MultipartEntity
Android使用post方式上传图片到服务器的方法