Android 上传文件到服务器
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代码库
Android客户端
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[*]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;
[*] 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
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