Android 通过Base64上传图片到服务器

之前做上传图片是采用HttpServlet上传，不过用了一下Base64上传图片后，感觉比HttpServlet方便很多，大家也可以跟着尝试一下。

前台图片处理：（传Bitmap对象即可）

	/**
	 * 通过Base32将Bitmap转换成Base64字符串
	 * @param bit
	 * @return
	 */
	public String Bitmap2StrByBase64(Bitmap bit){
	   ByteArrayOutputStream bos=new ByteArrayOutputStream();
	   bit.compress(CompressFormat.JPEG, 40, bos);//参数100表示不压缩
	   byte[] bytes=bos.toByteArray();
	   return Base64.encodeToString(bytes, Base64.DEFAULT);
	}

前台发送数据：（調用setImgByStr()方法，第一個參數imgStr 为Bitmap转成Base64的字符串，第二个参数imgName为图片的名字，包含后缀名.jpg）

	public static String host = "http://192.168.1.166:8080/ImageServer/";
	
	public static String getContent(String url) throws Exception {

		StringBuilder sb = new StringBuilder();
 
		HttpClient client = new DefaultHttpClient();
		HttpParams httpParams = client.getParams();
		// 设置网络超时参数
		HttpConnectionParams.setConnectionTimeout(httpParams, 3000);

		HttpConnectionParams.setSoTimeout(httpParams, 5000);
		HttpResponse response = client.execute(new HttpGet(url));
		HttpEntity entity = response.getEntity();
		if (entity != null) {
			BufferedReader reader = new BufferedReader(new InputStreamReader(
					entity.getContent(), "UTF-8"), 8192);

			String line = null;
			while ((line = reader.readLine()) != null) {
				sb.append(line + "\n");
			}
			reader.close();

		}

		return sb.toString();
	}
	public static HttpResponse post(Map<String, Object> params, String url) {

		HttpClient client = new DefaultHttpClient();
		HttpPost httpPost = new HttpPost(url);
		httpPost.addHeader("charset", HTTP.UTF_8);
		httpPost.setHeader("Content-Type",
				"application/x-www-form-urlencoded; charset=utf-8");
		HttpResponse response = null;
		if (params != null && params.size() > 0) {
			List<NameValuePair> nameValuepairs = new ArrayList<NameValuePair>();
			for (String key : params.keySet()) {
				nameValuepairs.add(new BasicNameValuePair(key, (String) params
						.get(key)));
			}
			try {
				httpPost.setEntity(new UrlEncodedFormEntity(nameValuepairs,
						HTTP.UTF_8));
				response = client.execute(httpPost);
			} catch (UnsupportedEncodingException e) {
				e.printStackTrace();
			} catch (ClientProtocolException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			} catch (RuntimeException e) {
				e.printStackTrace();
			}
		} else {
			try {
				response = client.execute(httpPost);
			} catch (ClientProtocolException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}

		return response;

	}
	public static Object getValues(Map<String, Object> params, String url) {
		String token = "";
		HttpResponse response = post(params, url);
		if (response != null) {
			try {
				token = EntityUtils.toString(response.getEntity());
				response.removeHeaders("operator");
			} catch (ParseException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return token;
	}
	public static Object setImgByStr(String imgStr,String imgName){
		String url =  host+"channel-uploadImage.action";
		Map<String,Object> params = new HashMap<String, Object>();
		params.put("imgStr", imgStr);
		params.put("imgName", imgName);
		return getValues(params, url);
	}

后台接收数据：

	public void uploadPhoto() {
		//获取存储路径
		HttpServletRequest request = ServletActionContext.getRequest();
		String path = ServletActionContext.getServletContext().getRealPath("/")+"upload";
		File file = new File(path);
		if(!file.exists()){
			file.mkdir();
		}
		String imgPath  = path + request.getParameter("imgName");
		String imgStr = request.getParameter("imgStr");
		boolean flag = string2Image(imgStr, imgPath);
		JacksonUtil.responseJSON(response, flag);
	}

后台图片处理：

	/**
	 * 通过BASE64Decoder解码，并生成图片
	 * @param imgStr 解码后的string
	 */
	public boolean string2Image(String imgStr, String imgFilePath) {
		// 对字节数组字符串进行Base64解码并生成图片
		if (imgStr == null)
			return false;
		try {
			// Base64解码
			byte[] b = new BASE64Decoder().decodeBuffer(imgStr);
			for (int i = 0; i < b.length; ++i) {
				if (b[i] < 0) {
					// 调整异常数据
					b[i] += 256;
				}
			}
			// 生成Jpeg图片
			OutputStream out = new FileOutputStream(imgFilePath);
			out.write(b);
			out.flush();
			out.close();
			return true;
		} catch (Exception e) {
			return false;
		}
	}	

OK ! 如果成功上传前端会接收到true ，反之失败false。希望对大家有所帮助！