Android实现上传图片至java服务器

<uses-permission android:name="android.permission.INTERNET"/><uses-permission android:name="android.permission.CAMERA"/><uses-permissionandroid:name="android.permission.WRITE_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/activity_main" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <ImageView  android:id="@+id/imageView"  android:layout_width="match_parent"  android:layout_height="300dp"/> <EditText  android:id="@+id/editText"  android:layout_width="match_parent"  android:layout_height="42dp"  android:layout_margin="16dp"  android:background="@drawable/edit_text_bg"/> <Button  android:id="@+id/choose_image"  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:text="选择图片"/> <Button  android:id="@+id/upload_image"  android:layout_width="match_parent"  android:layout_height="wrap_content"  android:text="上传图片"/></LinearLayout>

package com.eric.uploadimage;import android.annotation.SuppressLint;import android.app.ProgressDialog;import android.content.Intent;import android.database.Cursor;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.net.Uri;import android.os.AsyncTask;import android.provider.MediaStore;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.util.Base64;import android.view.View;import android.widget.EditText;import android.widget.ImageView;import android.widget.Toast;import com.loopj.android.http.AsyncHttpClient;import com.loopj.android.http.AsyncHttpResponseHandler;import com.loopj.android.http.RequestParams;import java.io.ByteArrayOutputStream;import cz.msebera.android.httpclient.Header;@SuppressLint("NewApi")public class UploadActivity extends AppCompatActivity implements View.OnClickListener { private EditText editTextName; private ProgressDialog prgDialog; private int RESULT_LOAD_IMG = 1; private RequestParams params = new RequestParams(); private String encodedString; private Bitmap bitmap; private String imgPath; @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_main);  prgDialog= new ProgressDialog(this);  prgDialog.setCancelable(false);  editTextName = (EditText) findViewById(R.id.editText);  findViewById(R.id.choose_image).setOnClickListener(this);  findViewById(R.id.upload_image).setOnClickListener(this); } @Override public void onClick(View view) {  switch (view.getId()) {   case R.id.choose_image:    loadImage();    break;   case R.id.upload_image:    uploadImage();    break;  } } public void loadImage() {  //这里就写了从相册中选择图片，相机拍照的就略过了  Intent galleryIntent = new Intent(Intent.ACTION_PICK,  android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);  startActivityForResult(galleryIntent, RESULT_LOAD_IMG); } //当图片被选中的返回结果 @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) {  super.onActivityResult(requestCode, resultCode, data);  try {   if (requestCode == RESULT_LOAD_IMG && resultCode == RESULT_OK && null != data) {    Uri selectedImage = data.getData();    String[] filePathColumn = { MediaStore.Images.Media.DATA };    // 获取游标    Cursor cursor = getContentResolver().query(selectedImage, filePathColumn, null, null, null);    cursor.moveToFirst();    int columnIndex = cursor.getColumnIndex(filePathColumn[0]);    imgPath = cursor.getString(columnIndex);    cursor.close();    ImageView imgView = (ImageView) findViewById(R.id.imageView);    imgView.setImageBitmap(BitmapFactory.decodeFile(imgPath));    } else {    Toast.makeText(this, "You haven't picked Image",      Toast.LENGTH_LONG).show();   }  } catch (Exception e) {   Toast.makeText(this, "Something went wrong", Toast.LENGTH_LONG).show();  } } //开始上传图片 private void uploadImage() {  if (imgPath != null && !imgPath.isEmpty()) {   prgDialog.setMessage("Converting Image to Binary Data");   prgDialog.show();   encodeImagetoString();  } else {   Toast.makeText(getApplicationContext(), "You must select image from gallery before you try to upload",     Toast.LENGTH_LONG).show();  } } public void encodeImagetoString() {  new AsyncTask<Void, Void, String>() {   protected void onPreExecute() {   };   @Override   protected String doInBackground(Void... params) {    BitmapFactory.Options options = null;    options = new BitmapFactory.Options();    options.inSampleSize = 3;    bitmap = BitmapFactory.decodeFile(imgPath,      options);    ByteArrayOutputStream stream = new ByteArrayOutputStream();    // 压缩图片    bitmap.compress(Bitmap.CompressFormat.PNG, 50, stream);    byte[] byte_arr = stream.toByteArray();    // Base64图片转码为String    encodedString = Base64.encodeToString(byte_arr, 0);    return "";   }   @Override   protected void onPostExecute(String msg) {    prgDialog.setMessage("Calling Upload");    // 将转换后的图片添加到上传的参数中    params.put("image", encodedString);    params.put("filename", editTextName.getText().toString());    // 上传图片    imageUpload();   }  }.execute(null, null, null); } public void imageUpload() {  prgDialog.setMessage("Invoking JSP");  String url = "http://172.18.2.73:8080/upload/uploadimg.jsp";  AsyncHttpClient client = new AsyncHttpClient();  client.post(url, params, new AsyncHttpResponseHandler() {   @Override   public void onSuccess(int statusCode, Header[] headers, byte[] bytes) {    prgDialog.hide();    Toast.makeText(getApplicationContext(), "upload success", Toast.LENGTH_LONG).show();   }   @Override   public void onFailure(int statusCode, Header[] headers, byte[] bytes, Throwable throwable) {    prgDialog.hide();    if (statusCode == 404) {     Toast.makeText(getApplicationContext(),       "Requested resource not found", Toast.LENGTH_LONG).show();    }    // 当 Http 响应码'500'    else if (statusCode == 500) {     Toast.makeText(getApplicationContext(),       "Something went wrong at server end", Toast.LENGTH_LONG).show();    }    // 当 Http 响应码 404, 500    else {     Toast.makeText(       getApplicationContext(), "Error Occured n Most Common Error: n1. Device " +         "not connected to Internetn2. Web App is not deployed in App servern3." +         " App server is not runningn HTTP Status code : "         + statusCode, Toast.LENGTH_LONG).show();    }   }  }); } @Override protected void onDestroy() {  super.onDestroy();  if (prgDialog != null) {   prgDialog .dismiss();  } }}

public class UploadImage { public static void convertStringtoImage(String encodedImageStr, String fileName) {  try {   // Base64解码图片   byte[] imageByteArray = Base64.decodeBase64(encodedImageStr);   //   FileOutputStream imageOutFile = new FileOutputStream("D:/uploads/" + fileName+".jpg");   imageOutFile.write(imageByteArray);   imageOutFile.close();   System.out.println("Image Successfully Stored");  } catch (FileNotFoundException fnfe) {   System.out.println("Image Path not found" + fnfe);  } catch (IOException ioe) {   System.out.println("Exception while converting the Image " + ioe);  } }}

<%@page import="com.eric.UploadImage"%><%@ page contentType="text/html;charset=UTF-8" language="java" %><html><head> <title>图片上传</title></head><body><% String imgEncodedStr = request.getParameter("image"); String fileName = request.getParameter("filename"); System.out.println("Filename: "+ fileName); if(imgEncodedStr != null){  UploadImage.convertStringtoImage(imgEncodedStr, fileName);  out.print("Image upload complete, Please check your directory"); } else{  out.print("Image is empty"); }%></body></html>