使用http请求框架实现文件上传到服务器(Android-async-http)

1

准备3个jar包httpcore-4.4.3.jar，android-async-http-1.4.8.jar，httpclient-4.3.6.jar
链接：https://pan.baidu.com/s/1CK1NPfHBtppF-lxR-RcUmQ
密码：f16a

2

导入3个jar包

image.png

MainActivity

package com.example.xeonrnc.upload_demo;
import android.app.Activity;
import android.content.ContentUris;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.net.Uri;
import android.os.Build;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;
import com.loopj.android.http.RequestParams;
import org.apache.http.Header;
import java.io.File;
import java.io.FileNotFoundException;
 
 
public class MainActivity extends AppCompatActivity {
    private Button upload_btn;
    private Button choose_file;
    public static String filePath;
    private static final int REQUEST_EXTERNAL_STORAGE = 1;
    private static String[] PERMISSIONS_STORAGE = {
            "android.permission.READ_EXTERNAL_STORAGE",
            "android.permission.WRITE_EXTERNAL_STORAGE"
    };
    public static void verifyStoragePermissions(Activity activity) {
 
        try {
            //检测是否有写的权限
            int permission = ActivityCompat.checkSelfPermission(activity,
                    "android.permission.WRITE_EXTERNAL_STORAGE");
            if (permission != PackageManager.PERMISSION_GRANTED) {
                // 没有写的权限，去申请写的权限，会弹出对话框
                ActivityCompat.requestPermissions(activity, PERMISSIONS_STORAGE,REQUEST_EXTERNAL_STORAGE);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
 
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        verifyStoragePermissions(this);
        upload_btn=(Button)findViewById(R.id.upload_btn);
        choose_file=(Button)findViewById(R.id.choose_file);
        upload_btn.setOnClickListener(new ButtonClickListener());
        choose_file.setOnClickListener(new ButtonClickListener());
 
    }
 
 
    class ButtonClickListener implements View.OnClickListener{
        @Override
        public void onClick(View v){
            switch (v.getId()){
                case R.id.choose_file:
                    chooseFile();
                    break;
                case R.id.upload_btn:
                    uploadFile();
                    break;
            }
 
        }
    }
 
 
    //选择文件
    public void chooseFile(){
        Intent intent=new Intent(Intent.ACTION_GET_CONTENT);
        intent.setType("*/*");
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        startActivityForResult(intent,1);
    }
    //选择文件完成以后会触发的onActivityResult方法
    @Override
    public void onActivityResult(int requestCode,int resultCode,Intent data){
        switch (requestCode){
            case 1:
                if(resultCode==RESULT_OK){
                    Uri uri=data.getData();
                    //如果API>=19
                    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT){
                        filePath=getRealPathFromUriAboveApi19(this,uri);
                    }else{
                        filePath=getRealPathFromUriBelowAPI19(this,uri);
                    }
                    Log.d("test","filePath:  "+filePath);
                    TextView show_file_path=(TextView)findViewById(R.id.show_file_path);
                    show_file_path.setText("文件路径："+filePath);
 
                }
                break;
        }
 
        super.onActivityResult(requestCode,resultCode,data);
    }
 
    //点击上传按钮会触发的方法
    public void uploadFile(){
        AsyncHttpClient client=new AsyncHttpClient();
        RequestParams params=new RequestParams();
        try {
//                    String path=Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES)+"/c.jpg";
//                        filePath="/storage/emulated/0/Pictures/hz.png";
 
 
            params.put("ui.png",new File(filePath),"image/jpeg");
 
        } catch (FileNotFoundException e){
            e.printStackTrace();
 
        }
        //client.post参数解释：如果用Fragment，那么把this改为getContext(),  params 表示发请求的参数
        //Upload_Servlet是服务器接收端servlet，使用url访问这个servlet
        client.post(this, "http://192.168.43.173:8080/my_upload/servlet/Upload_Servlet", params, new AsyncHttpResponseHandler() {
            @Override
            public void onSuccess(int i, Header[] headers, byte[] bytes) {
                System.out.println(new String(bytes));
            }
 
            @Override
            public void onFailure(int i, Header[] headers, byte[] bytes, Throwable throwable) {
                System.out.println(new String(bytes));
            }
 
 
        });
 
    }
 
 
 
 
 
 
 
    //==========================================================================
    //因为直接用手机自带的文件管理器去选择一个文件的话，返回的并不是真实路径
    //所以下面的代码只是用来获取文件的真实路径
    private static String getRealPathFromUriBelowAPI19(Context context, Uri uri) {
        return getDataColumn(context, uri, null, null);
    }
    private static String getRealPathFromUriAboveApi19(Context context, Uri uri) {
        filePath = null;
        if (DocumentsContract.isDocumentUri(context, uri)) {
            // 如果是document类型的 uri, 则通过document id来进行处理
            String documentId = DocumentsContract.getDocumentId(uri);
            if (isMediaDocument(uri)) { // MediaProvider
                // 使用':'分割
                String id = documentId.split(":")[1];
 
                String selection = MediaStore.Images.Media._ID + "=?";
                String[] selectionArgs = {id};
                filePath = getDataColumn(context, MediaStore.Images.Media.EXTERNAL_CONTENT_URI, selection, selectionArgs);
            } else if (isDownloadsDocument(uri)) { // DownloadsProvider
                Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(documentId));
                filePath = getDataColumn(context, contentUri, null, null);
            }
        } else if ("content".equalsIgnoreCase(uri.getScheme())){
            // 如果是 content 类型的 Uri
            filePath = getDataColumn(context, uri, null, null);
        } else if ("file".equals(uri.getScheme())) {
            // 如果是 file 类型的 Uri,直接获取图片对应的路径
            filePath = uri.getPath();
        }
        return filePath;
    }
 
 
 
    private static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {
        String path = null;
 
        String[] projection = new String[]{MediaStore.Images.Media.DATA};
        Cursor cursor = null;
        try {
            cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
            if (cursor != null && cursor.moveToFirst()) {
                int columnIndex = cursor.getColumnIndexOrThrow(projection[0]);
                path = cursor.getString(columnIndex);
            }
        } catch (Exception e) {
            if (cursor != null) {
                cursor.close();
            }
        }
        return path;
    }
 
 
    private static boolean isMediaDocument(Uri uri) {
        return "com.android.providers.media.documents".equals(uri.getAuthority());
    }
 
    private static boolean isDownloadsDocument(Uri uri) {
        return "com.android.providers.downloads.documents".equals(uri.getAuthority());
    }
 
 
 
 
}

activity_main.xml布局文件

配置AndroidManifest.xml

application添加属性 android:usesCleartextTraffic="true"
添加联网和sdcard读写权限

防止android9闪退

3

服务器接收端servlet
新建一个web项目，项目名为my_upload
Upload_Servlet

package upload;
 
import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.UUID;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
 
public class Upload_Servlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
 
    public Upload_Servlet() {
        super();
 
    }
 
 
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 
    }
 
 
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        request.setCharacterEncoding("UTF-8");
        DiskFileItemFactory factory=new DiskFileItemFactory();
        ServletFileUpload sfu=new ServletFileUpload(factory);
        try{
            List list=sfu.parseRequest(request);
            for(FileItem fileItem:list){
                if(fileItem.isFormField()){
                    String fieldName=fileItem.getFieldName();
                    if("description".equals(fieldName)){
                        String desc=new String(fileItem.getString().getBytes("UTF-8"),"GBK");
                        System.out.println("description="+desc);
                    }
                }else {
                    String name=fileItem.getName();
                    //   /pic 表示当前项目所在的路径下的pic文件夹的路径
                    //   相当于：
                    //  C:\apache-tomcat-9.0.20\webapps\my_upload\ upload
                    String path=getServletContext().getRealPath("/upload");
                    System.out.println(path);
                    String extNameString=name.substring(name.lastIndexOf("."));
                    //随机获取uuid ，作为文件上传到服务器以后的文件名
                    String uuid=UUID.randomUUID().toString();
                    //uuid+扩展名
                    name=uuid+extNameString;
                    path=path+"/"+name;
                    System.out.println(path);
                    fileItem.write(new File(path));
                }
            }
        }catch (Exception e) {
            // TODO: handle exception
        }
        doGet(request, response);
    }
 
}

web.xml （设置一下映射）

  upload
  
    index.html
    index.htm
    index.jsp
    default.html
    default.htm
    default.jsp
  
  
    Upload_Servlet
    upload.Upload_Servlet
  
  
    Upload_Servlet
    /servlet/Upload_Servlet
  

4

修改一下tomcat的访问ip地址：
编辑 tomcat 的C:\apache-tomcat-9.0.20\conf 目录下的 server.xml 文件
修改 为本机的 ip地址，我这里用手机热点

image.png

5

如果你的远程服务器，启动tomcat的情况下，那么把项目打包成war包，发布到服务器的tomcat的webapps的目录下就可以了，然后把IP地址改为公网ip