Android上传图片到服务器(使用base64字节流的形式)

2017-01-11 15:33:36来源:http://www.jianshu.com/p/9d0548302133作者:东方以北东方少年人点击

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Android端图片处理:(传Bitmap对象)
/** 
* 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);
}

Android端发送数据:
/**
* 调用setImgByStr()方法,第一个参数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://192.168.1.96:8080/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;
}
}

最后 ! 如果上传成功Android端会收到true ,上传失败会收到false。


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