Android上传图片至java服务器

这几天有做到一个小的案例，手机拍照、相册照片上传到服务器。客户端和服务器的代码都贴出来：

客户端
AndroidManifest.xml添加以下权限

<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"/>

客户端的上传图片activity_upload.xml布局文件

<?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>

UploadActivity.java界面代码

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();        }    }}

服务端
这里用是Intellij Idea 2016.3.1+Tomcat 搭建的本地服务器，前篇文章有介绍具体的搭建步骤。
服务端项目结构：UploadImage.javauploadimg.jsp`、lib库

UploadImage.java 类

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);        }    }}

uploadimg.jsp 文件

<%@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>

运行结果：

客户端

服务端

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