android上传图片到服务器

compile 'com.zhy:okhttputils:2.4.1'

class FileUpdateCallBack implements Callback {

@Override
public void onFailure(Call call, IOException e) {
}

@Override
public void onResponse(Call call, final Response responseR) throws IOException {
}
}

public void updateImage(String url,Map<String,String> params,List<String> imagePaths){
final OkHttpClient client = new OkHttpClient();

MultipartBody.Builder builder = new MultipartBody.Builder().setType(MultipartBody.FORM);
//遍历map中所有参数到builder
for (String key : params.keySet()) {
builder.addFormDataPart(key, params.get(key));
}
//遍历paths中所有图片绝对路径到builder，并约定key如“upload”作为后台接受多张图片的key
for (String path : imagePaths) {
builder.addFormDataPart("images", FileUtil.getFileName(path), RequestBody.create(MediaType.parse("image/" + FileUtil.getFileType(path)), new File(path)));
}
//构建请求体
RequestBody requestBody = builder.build();
//构建请求
Request request = new Request.Builder()
.url(url)//地址
.post(requestBody)//添加请求体
.build();
client.newCall(request).enqueue(new FileUpdateCallBack());

}

public static String getFileType(String path){
return path.substring(path.lastIndexOf(".") + 1);
}