Android程序使用smartupload上传文件的写法

package com.test;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.UUID;

import org.apache.http.Header;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Application.OnProvideAssistDataListener;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.os.Environment;
import android.view.View;
import android.widget.Toast;

import com.lidroid.xutils.view.annotation.event.OnProgressChanged;
import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;
import com.loopj.android.http.Base64;
import com.loopj.android.http.RequestParams;

public class UploadActivity extends Activity {

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_upload);
	}

	public void upload(View view) {
		String path = Environment.getExternalStorageDirectory().getAbsolutePath();
		File file = new File(path + "/1.txt");
		/* File file = new File("/data/buggreports"); */
		byte[] b = null;
		if (file.exists() && file.length() > 0) {
			Toast.makeText(this, "文件" + path, 1).show();
			InputStream input = null;
			b = new byte[(int) file.length()];
			try {
				input = new FileInputStream(file);
				input.read(b);
				input.close();
			} catch (FileNotFoundException e1) {
				e1.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			}
		} else {
			Toast.makeText(this, "文件不存在", 1).show();
		}

		// Bitmap bm = BitmapFactory.decodeByteArray(b, 0, b.length);
		//Bitmap bm = BitmapFactory.decodeFile("/mnt/sdcard/1.txt");//不是图片，会出错
		Bitmap bm = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
		ByteArrayOutputStream baos = new ByteArrayOutputStream();
		// 将bitmap一字节流输出 Bitmap.CompressFormat.PNG 压缩格式，100：压缩率，baos：字节流
		bm.compress(Bitmap.CompressFormat.PNG, 100, baos);
		try {
			baos.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
		byte[] buffer = baos.toByteArray();
		System.out.println("图片的大小：" + buffer.length);

		// 将图片的字节流数据加密成base64字符输出
		String photo = Base64.encodeToString(b, 0, b.length, Base64.DEFAULT);

		AsyncHttpClient client = new AsyncHttpClient();
		RequestParams params = new RequestParams();

		params.put("file", photo);
		params.put("filename", "zhangsan");

		// client.addHeader("Content-Type",
		// "multipart/form-data;boundary="+UUID.randomUUID());
		client.post("http://10.0.2.2:8080/sharefriend/UploadServlet", params, new AsyncHttpResponseHandler() {

			@Override
			public void onFailure(int arg0, Header[] arg1, byte[] arg2, Throwable arg3) {
				System.out.println(arg3);
			}

			@Override
			public void onSuccess(int arg0, Header[] arg1, byte[] arg2) {
				Toast.makeText(UploadActivity.this, "上传成功", Toast.LENGTH_SHORT).show();				
			}
		});
	}
}

服务端的写法:

package com.test.servlet;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

import Decoder.BASE64Decoder;

import com.google.gson.Gson;


@WebServlet("/UploadServlet")
public class UploadServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	public UploadServlet() {
		super();
	}

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doPost(request, response);
	}

	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException,
			IOException {
		receiveFile(request, response);
	}

	private void receiveFile(HttpServletRequest request, HttpServletResponse response) {
		try {
			request.setCharacterEncoding("utf-8");
		} catch (UnsupportedEncodingException e1) {
			e1.printStackTrace();
		}
		response.setCharacterEncoding("utf-8");
		response.setContentType("text/html");
		String photo = request.getParameter("file");
		String name = request.getParameter("filename");

		try {

			// 对base64数据进行解码 生成 字节数组，不能直接用Base64.decode（）；进行解密
			byte[] photoimg = new BASE64Decoder().decodeBuffer(photo);
			for (int i = 0; i < photoimg.length; ++i) {
				if (photoimg[i] < 0) {
					// 调整异常数据
					photoimg[i] += 256;
				}
			}

			// byte[] photoimg =
			// Base64.decode(photo);//此处不能用Base64.decode（）方法解密，我调试时用此方法每次解密出的数据都比原数据大
			// 所以用上面的函数进行解密，在网上直接拷贝的，花了好几个小时才找到这个错误
			System.out.println("图片的大小：" + photoimg.length);
			File file = new File("e:", "decode.txt");
			File filename = new File("e:\\name.txt");
			if (!filename.exists()) {
				file.createNewFile();
			}
			if (!file.exists()) {
				file.createNewFile();
			}
			FileOutputStream out = new FileOutputStream(file);
			FileOutputStream out1 = new FileOutputStream(filename);
			out1.write(name.getBytes());
			out.write(photoimg);
			out.flush();
			out.close();
			out1.flush();
			out1.close();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

上传在Android端需用到 3 个jar包:    android-async-http-1.4.7.jar,    sun.misc.BASE64Decoder.jar, jspsmartupload.jar