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：
