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   源码介绍

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package com.tangcco.fileupload_client;

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.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.os.StrictMode;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class PhotoUploadActivity extends Activity {
	private String newName = "image.jpg";
	private String uploadFile = "/storage/sdcard/Pictures/e1.png";// 要上传的文件
	private String actionUrl = "http://192.168.56.1:8080/fileupload_server/UploadServlet";
	private TextView mText1;
	private TextView mText2;
	private Button mButton;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_upload_file);

		/**
		 * 强制在线程模式下进行网络操作
		 */
		StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
				.detectDiskReads().detectDiskWrites().detectNetwork()
				.penaltyLog().build());
		StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()
				.detectLeakedSqlLiteObjects().detectLeakedClosableObjects()
				.penaltyLog().penaltyDeath().build());

		mText1 = (TextView) findViewById(R.id.myText2);
		// 文件路径：
		mText1.setText(uploadFile);
		mText2 = (TextView) findViewById(R.id.myText3);
		// 上传网址：
		mText2.setText(actionUrl);
		/* 设置mButton的onClick事件处理 */
		mButton = (Button) findViewById(R.id.myButton);
		mButton.setOnClickListener(new View.OnClickListener() {
			public void onClick(View v) {
				// TODO Auto-generated method stub
				uploadFile();
			}
		});

	}

	/* 上传文件至Server的方法 */
	private void uploadFile() {
		String end = "\r\n";
		String twoHyphens = "--";
		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);

			// 设置http连接属性
			con.setRequestMethod("POST");
			con.setRequestProperty("Connection", "Keep-Alive");
			con.setRequestProperty("Charset", "UTF-8");
			con.setRequestProperty("Content-Type",
					"multipart/form-data;boundary="   boundary);

			DataOutputStream ds = new DataOutputStream(con.getOutputStream());
			ds.writeBytes(twoHyphens   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);
			/* 设置每次写入1024bytes */
			int bufferSize = 1024;
			byte[] buffer = new byte[bufferSize];
			int length = -1;
			/* 从文件读取数据至缓冲区 */
			while ((length = fStream.read(buffer)) != -1) {
				/* 将资料写入DataOutputStream中 */
				ds.write(buffer, 0, length);
			}
			ds.writeBytes(end);
			ds.writeBytes(twoHyphens   boundary   twoHyphens   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);
			}
			/* 将Response显示于Dialog */
			showDialog("上传成功\r\n"
					  new String(b.toString().trim().getBytes("UTF-8")));
			/* 关闭DataOutputStream */
			ds.close();
		} catch (Exception e) {
			showDialog("上传失败"   e);
		}
	}

	/* 显示Dialog的method */
	private void showDialog(String mess) {
		new AlertDialog.Builder(PhotoUploadActivity.this).setTitle("Message")
				.setMessage(mess)
				.setNegativeButton("确定", new DialogInterface.OnClickListener() {
					public void onClick(DialogInterface dialog, int which) {
					}
				}).show();
	}

}