简介
由于Android给我们提供的Http请求方式之一 ：HttpURLConnection，使用起来非常麻烦，所以一般我们实际开发并不会用HttpURLConnection和HttpClient，而是会使用别人封装好的第三方网络请求框架，诸如：Volley，android-async-http，loopj,OkHttp等，因为网络操作涉及到 异步以及多线程，自己动手写的话，很麻烦，所以实际开发还是直接用第三方。这里我们选择的是近来最火的开源HTTP框架——OKHttp，来实现Android客户端的工作。GitHub地址：https://github.com/square/okhttp上传功能包含了一个简单的文件选择器下载功能目前做得极不完善，几乎等于没做，后续还会改进
准备工作
新建一个安卓工程从官方网站上下载okhttp和okio的jar包
okhttp的下载地址：http://square.github.io/okhttp/
okio的下载地址：
https://repo1.maven.org/maven2/com/squareup/okio/okio/1.11.0/okio-1.11.0.jar
okio的jar包的下载地址其实就在okhttp的官网上，不一定用我给的链接去下载。
PS.也可以通过Maven或者Gradle来导入，但因为速度太慢，所以我直接下了jar包
3.将这两个jar包导入到工程中，放在libs目录下
右键点击jar包，选择Add As Library就行了，两个包都要添加。
下面是具体代码
package com.example.ywy.mycloud1;
import java.io.FileOutputStream;
import java.io.IOException;
import android.Manifest;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Build;
import android.os.Environment;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.util.concurrent.TimeUnit;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.Interceptor;
import okhttp3.MediaType;
import okhttp3.MultipartBody;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;
import okhttp3.ResponseBody;
import okio.Buffer;
import okio.BufferedSink;
import okio.BufferedSource;
import okio.ForwardingSink;
import okio.ForwardingSource;
import okio.Okio;
import okio.Sink;
import okio.Source;
public class MainActivity extends AppCompatActivity {
private OkHttpClient okHttpClient;
private TextView textView;
private File tempFile;
private File targetFile;
private String path;
private Button button1;
private Button button2;
private Button button3;
private Button button4;
private static final int REQUEST_EXTERNAL_STORAGE =
1;
private static final int FILE_SELECT_CODE =
1;
private static String[] PERMISSIONS_STORAGE = {
Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setTitle(
"上传文件并显示进度");
textView = (TextView) findViewById(R.id.tv1);
button1 = (Button) findViewById(R.id.btn_choose);
button2 = (Button) findViewById(R.id.btn_upload);
button3 = (Button) findViewById(R.id.btn_download);
button4 = (Button) findViewById(R.id.btn_display);
path =
"";
okHttpClient =
new OkHttpClient.Builder()
.readTimeout(
60, TimeUnit.SECONDS)
.connectTimeout(
10, TimeUnit.SECONDS)
.writeTimeout(
120, TimeUnit.SECONDS)
.build();
button1.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
showFileChooser();
}
});
button2.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
startUploadClick();
}
});
button3.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
startDownloadClick();
}
});
button4.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent =
new Intent(MainActivity.
this,DisplayActivity.class);
startActivity(intent);
}
});
}
private void showFileChooser() {
Intent intent =
new Intent(Intent.ACTION_GET_CONTENT);
intent.setType(
"*/*");
intent.addCategory(Intent.CATEGORY_OPENABLE);
try {
startActivityForResult( Intent.createChooser(intent,
"Select a File to Upload"), FILE_SELECT_CODE);
}
catch (android.content.ActivityNotFoundException ex) {
Toast.makeText(
this,
"Please install a File Manager.", Toast.LENGTH_SHORT).show();
}
}
@Override
protected void onActivityResult(
int requestCode,
int resultCode, Intent data) {
switch (requestCode) {
case FILE_SELECT_CODE:
if (resultCode == RESULT_OK) {
Uri uri = data.getData();
path = FileUtils.getPath(
this, uri);
}
break;
}
super.onActivityResult(requestCode, resultCode, data);
}
public String
getFileName(String pathandname){
int start=pathandname.lastIndexOf(
"/");
if(start!=-
1 ){
return pathandname.substring(start+
1);
}
else{
return null;
}
}
public void startUploadClick() {
String fileName =
"";
tempFile =
new File(path);
if (tempFile.getName() ==
null){
Toast.makeText(MainActivity.
this,
"找不到该文件!", Toast.LENGTH_SHORT).show();
}
else {
fileName = getFileName(path);
}
RequestBody requestBody =
new MultipartBody.Builder()
.setType(MultipartBody.FORM)
.addFormDataPart(
"file", fileName, RequestBody.create(MediaType.parse(
"image/jpg"), tempFile))
.build();
Request request =
new Request.Builder()
.url(
"http://xxx.xxx.xxx.xx/receive_file.php")
.post(requestBody)
.build();
okHttpClient.newCall(request).enqueue(callback_upload);
}
public void startDownloadClick() {
targetFile =
new File(
"/data/data/com.example.ywy.mycloud1/cache/" +
"test1.jpg");
Request request =
new Request.Builder()
.url(
"http://xxx.xxx.xxx.xx/downloads/woman.jpg")
.build();
okHttpClient.newCall(request).enqueue(callback_download);
}
private Callback callback_upload =
new Callback() {
@Override
public void onFailure(Call call, IOException e) {
setResult(e.getMessage(),
false);
}
@Override
public void onResponse(Call call, Response response)
throws IOException {
setResult(response.body().string(),
true);
}
};
private Callback callback_download =
new Callback() {
@Override
public void onFailure(Call call, IOException e) {
setResult(e.getMessage(),
false);
}
@Override
public void onResponse(Call call, Response response)
throws IOException {
if(response !=
null) {
InputStream is = response.body().byteStream();
FileOutputStream fos =
new FileOutputStream(targetFile);
byte[] buf =
new byte[
1024];
int hasRead =
0;
while((hasRead = is.read(buf)) >
0) {
fos.write(buf,
0, hasRead);
}
fos.close();
is.close();
setResult(
"下载成功",
true);
}
}
};
private void setResult(
final String msg,
final boolean success) {
runOnUiThread(
new Runnable() {
@Override
public void run() {
if (success) {
Toast.makeText(MainActivity.
this,
"请求成功", Toast.LENGTH_SHORT).show();
}
else {
Toast.makeText(MainActivity.
this,
"请求失败", Toast.LENGTH_SHORT).show();
}
textView.setText(msg);
}
});
}
}
FileUtils.java 用来辅助以获取所选文件的目录
package com.example.ywy.mycloud1;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
/**
* Created by YWY on 2016/11/9.
*/
public class FileUtils {
public static String
getPath(Context context, Uri uri) {
if (
"content".equalsIgnoreCase(uri.getScheme())) {
String[] projection = {
"_data" };
Cursor cursor =
null;
try {
cursor = context.getContentResolver().query(uri, projection,
null,
null,
null);
int column_index = cursor.getColumnIndexOrThrow(
"_data");
if (cursor.moveToFirst()) {
return cursor.getString(column_index);
}
}
catch (Exception e) {
}
}
else if (
"file".equalsIgnoreCase(uri.getScheme())) {
return uri.getPath();
}
return null;
}
}
DisplayActivity.java 展示下载内容的一个Activity，没什么用
package com.example.ywy.mycloud1;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ImageView;
public class DisplayActivity extends AppCompatActivity {
private ImageView imageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_display);
imageView = (ImageView)findViewById(R.id.iv);
Bitmap bitmap = BitmapFactory.decodeFile(
"/data/data/com.example.ywy.mycloud1/cache/test1.jpg");
imageView.setImageBitmap(bitmap);
}
}
还有两个布局文件就不贴了，很简单，自己写一下就行，无非是一些Button和TextView。
另外，不要忘了在AndroidManifest文件中添加读写存储以及联网的权限
<uses-permission Android:name="android.permission.INTERNET" /> <uses-permission android:name="android.permission.MOUNT_FORMAT_FILESYSTEMS" /> <uses-permission android:name="androd.permission.WRITE_EXTERNAL_STORAGE" /> <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
