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：
package com.xzq.upload;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity
{
private String newName = "htys.mp3";
//要上传的本地文件路径
private String uploadFile = "/data/data/com.xzq/htys.mp3";
//上传到服务器的指定位置
private String actionUrl = "http://192.168.100.100:8080/upload/upload.jsp";
private TextView mTextView1;
private TextView mTextView2;
private Button mButton1;
@Override
public void onCreate(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(new View.OnClickListener()
{
public void onClick(View v)
{
uploadFile();
}
});
}
private void uploadFile()
{
String end = "/r/n";
String Hyphens = "--";
String boundary = "*****";
try
{
URL url = new URL(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 = new DataOutputStream(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 = new FileInputStream(uploadFile);
/* 设定每次写入1024bytes */
int bufferSize = 1024;
byte[] buffer = new byte[bufferSize];
int length = -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();
int ch;
StringBuffer b = new StringBuffer();
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。
