Android 通过Base64上传图片到服务器实现实例

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！

来源：http://www.cnblogs.com/cuihongyu3503319/p/5155330.html