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云代码 - android代码库

android 上传文件到服务器

2012-09-27 作者:小蜜锋举报

[android]代码库

Android客户端
package com.example.testandroid;

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.view.View;
import android.widget.Button;
import android.widget.TextView;

public class PhotoUpload extends Activity {
	private String newName = "image.jpg";
	private String uploadFile = "/sdcard/image.JPG";// 要上传的文件
	private String actionUrl = "http://192.168.0.1:8080/PhotoUpload/servlet/UploadServlet";
	private TextView mText1;
	private TextView mText2;
	private Button mButton;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		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) {
				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" + b.toString().trim());
			/* 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(PhotoUpload.this).setTitle("Message")
				.setMessage(mess)
				.setNegativeButton("确定", new DialogInterface.OnClickListener() {
					public void onClick(DialogInterface dialog, int which) {
					}
				}).show();
	}
}


服务器端servlet
package com.demo;

import java.io.File;
import java.io.IOException;
import java.util.Date;
import java.util.Iterator;
import java.util.List;

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

import org.apache.commons.fileupload.DiskFileUpload;
import org.apache.commons.fileupload.FileItem;

public class UploadServlet extends HttpServlet {
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		String temp = request.getSession().getServletContext().getRealPath("/")
				+ "temp"; // 临时目录
		System.out.println("temp=" + temp);
		String loadpath = request.getSession().getServletContext()
				.getRealPath("/")
				+ "Image"; // 上传文件存放目录
		System.out.println("loadpath=" + loadpath);
		DiskFileUpload fu = new DiskFileUpload(); // 需要导入commons-fileupload-1.2.2.jar
													// http://commons.apache.org/fileupload/
		fu.setSizeMax(1 * 1024 * 1024); // 设置允许用户上传文件大小,单位:字节
		fu.setSizeThreshold(4096); // 设置最多只允许在内存中存储的数据,单位:字节
		fu.setRepositoryPath(temp); // 设置一旦文件大小超过getSizeThreshold()的值时数据存放在硬盘的目录

		// 开始读取上传信息
		int index = 0;
		List fileItems = null;

		try {
			fileItems = fu.parseRequest(request);
			System.out.println("fileItems=" + fileItems);
		} catch (Exception e) {
			e.printStackTrace();
		}

		Iterator iter = fileItems.iterator(); // 依次处理每个上传的文件
		while (iter.hasNext()) {
			FileItem item = (FileItem) iter.next();// 忽略其他不是文件域的所有表单信息
			if (!item.isFormField()) {
				String name = item.getName();// 获取上传文件名,包括路径
				name = name.substring(name.lastIndexOf("\\") + 1);// 从全路径中提取文件名
				long size = item.getSize();
				if ((name == null || name.equals("")) && size == 0)
					continue;
				int point = name.indexOf(".");
				name = (new Date()).getTime()
						+ name.substring(point, name.length()) + index;
				index++;
				File fNew = new File(loadpath, name);
				try {
					item.write(fNew);
				} catch (Exception e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}

			} else// 取出不是文件域的所有表单信息
			{
				String fieldvalue = item.getString();
				// 如果包含中文应写为:(转为UTF-8编码)
				// String fieldvalue = new
				// String(item.getString().getBytes(),"UTF-8");
			}
		}
		String text1 = "11";
		response.sendRedirect("result.jsp?text1=" + text1);
	}
}

activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <EditText
        android:id="@+id/myText2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="116dp"
        android:ems="10"
        android:inputType="textPersonName" />

    <EditText
        android:id="@+id/myText3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/myText2"
        android:layout_below="@+id/myText2"
        android:layout_marginTop="45dp"
        android:ems="10" />

    <Button
        android:id="@+id/myButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/myText3"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="61dp"
        android:text="上传" />

</RelativeLayout>




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