Android 实现文件上传功能(upload)

文件上传在B/S应用中是一种十分常见的功能，那么在Android平台下是否可以实现像B/S那样的文件上传功能呢？答案是肯定的。下面是一个模拟网站程序上传文件的例子。这里只写出了Android部分的代码，服务器的代码没有贴出来，有需要完整上传功能代码的朋友可以跟我联系哟…

首先新建一个Android工程，新建主启动Activity：

MainActivity.java：

packagecom.xzq.upload;

importjava.io.DataOutputStream;

importjava.io.FileInputStream;

importjava.io.InputStream;

importjava.net.HttpURLConnection;

importjava.net.URL;

importandroid.app.Activity;

importandroid.os.Bundle;

importandroid.view.View;

importandroid.widget.Button;

importandroid.widget.TextView;

importandroid.widget.Toast;

publicclassMainActivityextendsActivity

{

privateStringnewName="htys.mp3";

//要上传的本地文件路径

privateStringuploadFile="/data/data/com.xzq/htys.mp3";

//上传到服务器的指定位置

privateStringactionUrl="http://192.168.100.100:8080/upload/upload.jsp";

privateTextViewmTextView1;

privateTextViewmTextView2;

privateButtonmButton1;

@Override

publicvoidonCreate(Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

mTextView1= (TextView) findViewById(R.id.myText2);

mTextView1.setText("FilePath：/n"+uploadFile);

mTextView2= (TextView) findViewById(R.id.myText3);

mTextView2.setText("UploadPath：/n"+actionUrl);

/*设定mButton的onClick事件处理*/

mButton1= (Button) findViewById(R.id.myButton);

mButton1.setOnClickListener(newView.OnClickListener()

{

publicvoidonClick(View v)

{

uploadFile();

}

});

}

privatevoiduploadFile()

{

String end ="/r/n";

String Hyphens ="--";

String boundary ="*****";

try

{

URL url =newURL(actionUrl);

HttpURLConnection con = (HttpURLConnection) url.openConnection();

/*允许Input、Output，不使用Cache */

con.setDoInput(true);

con.setDoOutput(true);

con.setUseCaches(false);

/*设定传送的method=POST */

con.setRequestMethod("POST");

/* setRequestProperty */

con.setRequestProperty("Connection","Keep-Alive");

con.setRequestProperty("Charset","UTF-8");

con.setRequestProperty("Content-Type",

"multipart/form-data;boundary="+ boundary);

/*设定DataOutputStream */

DataOutputStream ds =newDataOutputStream(con.getOutputStream());

ds.writeBytes(Hyphens + boundary + end);

ds.writeBytes("Content-Disposition: form-data; "

+"name=/"file1/";filename=/""+newName+"/""+ end);

ds.writeBytes(end);

/*取得文件的FileInputStream */

FileInputStream fStream =newFileInputStream(uploadFile);

/*设定每次写入1024bytes */

intbufferSize = 1024;

byte[] buffer =newbyte[bufferSize];

intlength = -1;

/*从文件读取数据到缓冲区*/

while((length = fStream.read(buffer)) != -1)

{

/*将数据写入DataOutputStream中*/

ds.write(buffer, 0, length);

}

ds.writeBytes(end);

ds.writeBytes(Hyphens + boundary + Hyphens + end);

fStream.close();

ds.flush();

/*取得Response内容*/

InputStream is = con.getInputStream();

intch;

StringBuffer b =newStringBuffer();

while((ch = is.read()) != -1)

{

b.append((char) ch);

}

System.out.println("上传成功");

Toast.makeText(MainActivity.this,"上传成功", Toast.LENGTH_LONG)

.show();

ds.close();

}catch(Exception e)

{

System.out.println("上传失败"+ e.getMessage());

Toast.makeText(MainActivity.this,"上传失败"+ e.getMessage(),

Toast.LENGTH_LONG).show();

}

最后别忘了在AndroidManifest.xml中设置访问Internet的权限：

<uses-permission android:name="android.permission.INTERNET" />

在Android中上传文件的原理跟在web中上传文件基本是一致的，代码比较简单，就不多做解释了。

有问题的可留言或发送邮件zhongnan09@gmail.com。

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