Android 上传图片到服务器(单文件上传)
【摘要】
Android 上传图片到服务器
一、Android端选择图片并显示1.设计item2.设计数据类3.编写适配器，将数据装配到视图上4.核心代码4.1打开相册的方式4.2打开拍照的方式4.2.1兼容7.0后的拍照 4.3获取图片4.4.单文件上传图片核心代码4.5.多文件上传图片核心代码
二、服务器端
一、Android端选择图片并显示
1.设...
一、Android端选择图片并显示
1.设计item
我们将使用RecyclerView来展示我们选择好的图片。因此我们首先要设计item，item有两种：添加按钮、图片。
添加按钮item：add_image_button_item.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="110dp" android:layout_height="115dp"> <ImageView android:id="@+id/iv_img" android:layout_width="match_parent" android:layout_height="100dp" android:scaleType="centerCrop" android:src="@mipmap/img_pick" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" app:layout_constraintBottom_toBottomOf="parent"/>
</androidx.constraintlayout.widget.ConstraintLayout>
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图片：image_item.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:layout_width="110dp" android:layout_height="110dp"> <ImageView android:id="@+id/iv_img" android:layout_width="match_parent" android:layout_height="100dp" android:scaleType="centerCrop" android:src="@mipmap/img_pick" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" app:layout_constraintBottom_toBottomOf="parent"/> <ProgressBar android:id="@+id/pb_bar" android:layout_width="match_parent" android:layout_height="100dp" app:layout_constraintTop_toTopOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintBottom_toBottomOf="parent"/> <ImageView android:id="@+id/iv_delete" android:layout_width="35dp" android:layout_height="35dp" android:layout_alignParentRight="true" android:src="@mipmap/delete" app:layout_constraintTop_toTopOf="parent" app:layout_constraintEnd_toEndOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
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这个item包括了显示图片的ImageView，带一个右上角的删除按钮，底部带一个进度条。
当item显示图片时，删除按钮，进度条都应该设置为可见。当item是一个添加按钮时，它们就要隐藏。图片与添加按钮本来是可以分开的，但是为了方便，我将其写在一起。
activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <androidx.recyclerview.widget.RecyclerView android:id="@+id/rv_img" android:layout_width="wrap_content" android:layout_height="match_parent" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintLeft_toLeftOf="parent" app:layout_constraintRight_toRightOf="parent" app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
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2.设计数据类
数据类中有我们的图片数据：ImageFileBean.java。
public class ImageFileBean { private File file; // 图片文件 private boolean isUpload = false; //标识该文件是否上传 private Bitmap bitmap;// 图片 private boolean startUpload; // 标识图片是否开始上传，以此控件ProgressBar的显示 public ImageFileBean(File file, int pg) { this.file = file; } public ImageFileBean(File file, Bitmap bitmap,boolean isUpload) { this.file = file; this.isUpload = isUpload; this.bitmap = bitmap; }
...
}
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将图片数据与添加按钮统一处理的数据类：ItemBean.java。
public class ItemBean { private boolean isButton; // 是否是添加图片的按钮 private ImageFileBean imageFileBean; public ItemBean(){} public ItemBean(ImageFileBean bean,boolean isButton){ this.imageFileBean = bean; this.isButton = isButton; }
...
}
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3.编写适配器，将数据装配到视图上
LoadImageAdapter.java:
package com.wong.imageupload;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.ProgressBar;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import java.util.List;
public class LoadImageAdapter extends RecyclerView.Adapter<LoadImageAdapter.ButtonViewHolder> { private final static int BUTTON_TYPE = 100; private final static int IMAGE_TYPE = 200; private List<ItemBean> list = null; private OnImageItemClickListener onImageItemClickListener; public LoadImageAdapter(List<ItemBean> list) { this.list = list; } @NonNull @Override public ButtonViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) { switch (viewType) { case BUTTON_TYPE: View buttonView = LayoutInflater.from(parent.getContext()).inflate(R.layout.add_image_button_item, parent, false); return new ButtonViewHolder(buttonView); default: View imageView = LayoutInflater.from(parent.getContext()).inflate(R.layout.image_item, parent, false); return new ImageViewHolder(imageView); } } @Override public void onBindViewHolder(@NonNull ButtonViewHolder holder, final int position) { if (!list.get(position).isButton()) { ImageViewHolder imageViewHolder = (ImageViewHolder)holder; // 显示图片 imageViewHolder.mIVImg.setImageBitmap(list.get(position).getImageFileBean().getBitmap()); boolean startUpload = list.get(position).getImageFileBean().isStartUpload(); boolean isUpload = list.get(position).getImageFileBean().isUpload(); if(startUpload && !isUpload){ imageViewHolder.mPB.setVisibility(View.VISIBLE); }else{ imageViewHolder.mPB.setVisibility(View.GONE); } // 点击删除按钮 imageViewHolder.mIVDel.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (onImageItemClickListener != null) { onImageItemClickListener.onDelete(v, list.get(position), position); } } }); } holder.mIVImg.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (onImageItemClickListener != null) { onImageItemClickListener.onClick(v, list.get(position), position); } } }); } @Override public int getItemCount() { return list.size(); } @Override public int getItemViewType(int position) { if (list.get(position).isButton()) { return BUTTON_TYPE; } else { return IMAGE_TYPE; } } public void setOnImageItemClickListener(OnImageItemClickListener onImageItemClickListener) { this.onImageItemClickListener = onImageItemClickListener; } static class ButtonViewHolder extends RecyclerView.ViewHolder { ImageView mIVImg; View view; public ButtonViewHolder(@NonNull View itemView) { super(itemView); view = itemView; mIVImg = itemView.findViewById(R.id.iv_img); } } static class ImageViewHolder extends ButtonViewHolder { ImageView mIVDel; ProgressBar mPB; public ImageViewHolder(@NonNull View itemView) { super(itemView); mIVDel = itemView.findViewById(R.id.iv_delete); mPB = itemView.findViewById(R.id.pb_bar); } } public interface OnImageItemClickListener { void onClick(View view, ItemBean itemBean, int position); void onDelete(View view, ItemBean itemBean, int position); }
}
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4.核心代码
4.1打开相册的方式
// 这种方式是通过action方式打开android的其他app来完成的
Intent galleryIntent = new Intent(Intent.ACTION_PICK); // 系统默认的图片选择程序
galleryIntent.setType("image/*");
startActivityForResult(galleryIntent,REQUEST_GALLERY);
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获取选中的图片：
Uri uri = data.getData();
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4.2打开拍照的方式
// 这种方式是通过action方式打开android的其他app来完成的
// MediaStore.ACTION_IMAGE_CAPTURE 即android.media.action.IMAGE_CAPTURE
Intent cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);// 系统的相机程序
// 准备图片名称
String imageName = UUID.randomUUID().toString().replace("-","")+".jpg";
// 创建应用内缓存目录cache/images
CacheUtils.createImagesCacheFolder(MainActivity.this);
File cameraFile = new File(CacheUtils.getCacheImagesFolder(MainActivity.this).getPath()+"/"+imageName);
// 创建好图片文件接收拍照的数据
if(!cameraFile.exists()){
try {
cameraFile.createNewFile(); } catch (IOException e) { e.printStackTrace(); }
}
if(Build.VERSION.SDK_INT > Build.VERSION_CODES.M) {
// 在官方7.0的以上的系统中，尝试传递 file://URI可能会触发FileUriExposedException。7.0以上的系统需要使用FileProvider兼容拍照
cameraUri = FileProvider.getUriForFile(MainActivity.this, "com.wong.camera.fileprovider", cameraFile);
}else{ cameraUri = Uri.fromFile(cameraFile);
}
cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT,cameraUri);
startActivityForResult(cameraIntent,REQUEST_CAMERA);
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4.2.1兼容7.0后的拍照
在官方7.0的以上的系统中，尝试传递 file://URI可能会触发FileUriExposedException。7.0以上的系统需要使用FileProvider兼容拍照：
第一步：在AndroidManifest.xml加入以下内容。
<provider
android:authorities="com.wong.camera.fileprovider" android:name="androidx.core.content.FileProvider" android:exported="false" android:grantUriPermissions="true"> <meta-data android:name="android.support.FILE_PROVIDER_PATHS" android:resource="@xml/fileprovider"/>
</provider>
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第二步：新建资源目录xml，并配置FileProvider的资源目录。
fileprovider.xml:
<?xml version="1.0" encoding="utf-8"?>
<paths xmlns:android="http://schemas.android.com/apk/res/android"> <!--name,此值会隐藏您要共享的子目录的名称,path,实际的子目录名称--> <!--设备根目录new File("/")--> <root-path name="root" path="" /> <!--代表context.getFilesDir()--> <files-path name="my_files" path="files" /> <!--代表context.getCacheDir()--> <cache-path name="cache" path="images" /> <!--代表Environment.getExternalStorageDirectory(),如下代表的目录即为：Environment.getExternalStorageDirectory()/upload，其他同理。--> <external-path name="external" path="upload" /> <!--代表context.getExternalFilesDirs()--> <external-files-path name="name1" path="path1" /> <!--代表getExternalCacheDirs()--> <external-cache-path name="name2" path="path2" />
</paths>
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通过URI获取图片：
Bitmap bitmap = null;
if(uri != null){ try { BitmapFactory.Options options = new BitmapFactory.Options(); options.inSampleSize = 2; // 图片宽高都为原来的二分之一，即图片为原来的四分之一 bitmap = BitmapFactory.decodeStream(this.getContentResolver().openInputStream(uri), null, options); String filePath = uri.getEncodedPath();; File file = new File(filePath); }catch (Exception e){ }
}
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4.3获取图片
/** * 将Uri图片类型转换成File，BitMap类型 * 在界面上显示BitMap图片，以防止内存溢出 * 上传可选择File文件上传 * * @param uri */ private void saveUriToFile(Uri uri,int from) { Bitmap bitmap = null; if (uri != null) { try { BitmapFactory.Options options = new BitmapFactory.Options(); options.inSampleSize = 2; // 图片宽高都为原来的二分之一，即图片为原来的四分之一 bitmap = BitmapFactory.decodeStream(this.getContentResolver().openInputStream(uri), null, options); File file = null; switch (from){ case REQUEST_GALLERY: String filePath = FileUtils.getRealFilePath(this,uri); File oldFile = new File(filePath); // 修改文件名 String newFileName = UUID.randomUUID().toString().replace("-","")+".jpg"; String newFilePath = oldFile.getParent()+"/"+newFileName; file = new File(newFilePath); oldFile.renameTo(file); break; case REQUEST_CAMERA: file = cameraFile; break; } if(file == null || !file.exists()){ Log.i("异常：","文件不存在！"); } list.remove(addImgButton); // 先删除 if (list.size() < DEFAULT_NUM) { ItemBean itemBean = new ItemBean(new ImageFileBean(file, bitmap, false), false); list.add(itemBean); if (list.size() < DEFAULT_NUM) { // 如果图片数量还没有达到最大值，则将添加按钮添加到list后面 list.add(addImgButton); } } adapter.notifyDataSetChanged(); } catch (Exception e) { } } }
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4.4.单文件上传图片核心代码
在form表单中enctype属性规定了form表单在发送到服务器时候编码方式，它有如下的三个值：
①application/x-www-form-urlencoded：默认的编码方式。但是在用文本的传输和MP3等大型文件的时候，使用这种编码就显得 效率低下。
②multipart/form-data：指定传输数据为二进制类型，比如图片、mp3、文件。
③text/plain：纯文体的传输。空格转换为 “+” 加号，但不对特殊字符编码。
private void uploadImage(final ImageFileBean fileBean) { File file = fileBean.getFile(); if (file == null) return; if(!file.exists()){ Toast.makeText(this, "文件不存在！", Toast.LENGTH_SHORT).show(); return; } viewHolder.mTVText.setText("HashCode#"+SHA256.getSHA256(file)); Log.i("文件HashCode:",SHA256.getSHA256(file)); // 准备Body RequestBody requestBody = new MultipartBody.Builder() .setType(MultipartBody.FORM) .addFormDataPart("name",file.getName())// 其他信息 .addFormDataPart("id","12,13,14")// 其他信息 .addFormDataPart("type","2")// 其他信 .addFormDataPart("file", file.getName(), RequestBody.create(MediaType.parse("multipart/form-data"), file))//文件 .build(); Request request = new Request.Builder() .url(Global.UPLOAD_URL).post(requestBody) .addHeader("user-agent", "PDA") .addHeader("x-userid", "752332")// 添加x-userid请求头 .addHeader("x-sessionkey", "kjhsfjkaskfashfuiwf")// 添加x-sessionkey请求头 .addHeader("x-tonce", Long.valueOf(System.currentTimeMillis()).toString())// 添加x-tonce请求头 .addHeader("x-timestamp", Long.valueOf(System.currentTimeMillis()).toString())// 添加x-timestamp请求头 .build(); OkHttpClient okHttpClient = new OkHttpClient(); final Message msg = myHandler.obtainMessage(); okHttpClient.newCall(request).enqueue(new Callback() { @Override public void onFailure(@NotNull Call call, @NotNull IOException e) { msg.obj = fileBean; msg.what =0; myHandler.sendMessage(msg); } @Override public void onResponse(@NotNull Call call, @NotNull Response response) throws IOException { String result = response.body().string(); Log.i("上传图片结果：", result); msg.obj = fileBean; if (!response.isSuccessful()) { Log.i("响应失败：", response.code() + ""); msg.what =1; return; } msg.what = 3; myHandler.sendMessage(msg); } }); }
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4.5.多文件上传图片核心代码
二、服务器端
服务端我们选择用SpringBoot来实现，非常简单：
/** * 单文件上传 * * @param file * @param model * @param request * @return */ @PostMapping("/api/upload") public String fileUpload(@RequestParam(value = "file") MultipartFile file, Model model, HttpServletRequest request, @RequestParam(value = "type") int type, @RequestHeader(value = "user-agent") String userAgent) { if (file.isEmpty()) { System.out.println("文件为空空"); } logger.info("获得的其他参数type=" + type); logger.info("获得的Header user-agent=" + userAgent.toString()); // 如果参数比较少可以直接在方法上使用注解@RequestParam来映射到不同的名称上获得，当然如果不用此注解，也可以定义一个与传过来的参数名一样的形参来获得 // 蒜从客户端传过来的其他参数 Enumeration names = request.getParameterNames(); while (names.hasMoreElements()) { String key = names.nextElement().toString(); logger.info("客户端传过来的参数＃key＝" + key + ",value=" + request.getParameterValues(key).toString()); } Enumeration headers = request.getHeaderNames(); while (headers.hasMoreElements()) { String key = headers.nextElement().toString(); String info = "客户端传过来的Header参数:key＝" + key + ",value=" + request.getHeader(key); logger.info(info); } // BMP、JPG、JPEG、PNG、GIF String fileName = file.getOriginalFilename(); // 文件名 logger.info("上传文件名：" + fileName); String suffixName = fileName.substring(fileName.lastIndexOf(".")); // 后缀名 // 验证上传的文件是否图片 if (!".bmp".equalsIgnoreCase(suffixName) && !".jpg".equalsIgnoreCase(suffixName) && !".jpeg".equalsIgnoreCase(suffixName) && !".png".equalsIgnoreCase(suffixName) && !".gif".equalsIgnoreCase(suffixName)) { return "上传失败，请选择BMP、JPG、JPEG、PNG、GIF文件！"; } fileName = UUID.randomUUID() + suffixName; // 新文件名 File dest = new File(fileName); // 如果文件的父路径不存在，则创建 if (fileName.startsWith("/") && !dest.getParentFile().exists()) { dest.getParentFile().mkdirs(); } // 开始存放文件到指定目录去 try { file.transferTo(dest); return "上传成功"; } catch (IOException e) { e.printStackTrace(); return "上传失败"; } }
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同时在application.yml配置文件配置上传的目录：
spring:
servlet: multipart: location: /home/kyun/Downloads/recFiles
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附：HTTP请求报文
用WireShark软件对Android发起请求时的数据进行拦截，得到的HTTP请求的报文：
Hypertext Transfer Protocol POST /api/upload HTTP/1.1\r\n [Expert Info (Chat/Sequence): POST /api/upload HTTP/1.1\r\n] [POST /api/upload HTTP/1.1\r\n] [Severity level: Chat] [Group: Sequence] Request Method: POST Request URI: /api/upload Request Version: HTTP/1.1 user-agent: PDA\r\n x-userid: 752332\r\n x-sessionkey: kjhsfjkaskfashfuiwf\r\n x-tonce: 1591980645278\r\n x-timestamp: 1591980645278\r\n Content-Type: multipart/form-data; boundary=27fba8d3-a15a-40f6-8880-e0af1932914b\r\n Content-Length: 48558\r\n [Content length: 48558] Host: 192.168.43.120:8080\r\n Connection: Keep-Alive\r\n Accept-Encoding: gzip\r\n \r\n [Full request URI: http://192.168.43.120:8080/api/upload] [HTTP request 1/1] [Response in frame: 334] File Data: 48558 bytes
MIME Multipart Media Encapsulation, Type: multipart/form-data, Boundary: "27fba8d3-a15a-40f6-8880-e0af1932914b" [Type: multipart/form-data] First boundary: --27fba8d3-a15a-40f6-8880-e0af1932914b\r\n Encapsulated multipart part: Content-Disposition: form-data; name="name"\r\n Content-Length: 36\r\n\r\n Data (36 bytes) Data: 353636386333306432636638346534613834323364383837… [Length: 36] Boundary: \r\n--27fba8d3-a15a-40f6-8880-e0af1932914b\r\n Encapsulated multipart part: Content-Disposition: form-data; name="id"\r\n Content-Length: 8\r\n\r\n Data (8 bytes) Data: 31322c31332c3134 [Length: 8] Boundary: \r\n--27fba8d3-a15a-40f6-8880-e0af1932914b\r\n Encapsulated multipart part: Content-Disposition: form-data; name="type"\r\n Content-Length: 1\r\n\r\n Data (1 byte) Data: 32 [Length: 1] Boundary: \r\n--27fba8d3-a15a-40f6-8880-e0af1932914b\r\n Encapsulated multipart part: (multipart/form-data) Content-Disposition: form-data; name="file"; filename="5668c30d2cf84e4a8423d887527fd069.jpg"\r\n Content-Type: multipart/form-data\r\n Content-Length: 47952\r\n\r\n The multipart dissector could not find a required parameter. [Expert Info (Error/Protocol): The multipart dissector could not find a required parameter.] [The multipart dissector could not find a required parameter.] [Severity level: Error] [Group: Protocol] Data (47952 bytes) Data: ffd8ffe12ee245786966000049492a00080000000b001001… [Length: 47952] Last boundary: \r\n--27fba8d3-a15a-40f6-8880-e0af1932914b--\r\n
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文章来源: blog.csdn.net，作者：WongKyunban，版权归原作者所有，如需转载，请联系作者。
原文链接：blog.csdn.net/weixin_40763897/article/details/106511067
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