Android学习之客户端上传图片到服务器

根据项目需求，需要上传相册和拍照的图片，参考和借鉴了别人的资料和代码，简单地功能实现了。

一、HTTP multipart/form-data——上传报文格式

我们来了解下Android客户端如何通过HTTP协议来将图片上传到服务器。我们先来了解下HTTP multipart/form-data，上传报文格式。

假设接收文件的网页程序是http://172.31.8.6:8080/fileUpload/file_upload。假设我们要发送一个图片文件，文件名为“iamge.jpg”。

首先，客户端成功链接172.31.8.6后，会发送如下的HTTP请求：

POST/http://172.31.8.6:8080/fileUpload/file_upload HTTP/1.1 　　Accept: text/plain, */*
　　Accept-Language: zh-cn
　　Host: 172.31.8.6
　　Content-Type:multipart/form-data;boundary=-----------------------------7db372eb000e2
　　User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)
　　Content-Length: 3693
　　Connection: Keep-Alive　　-------------------------------7db372eb000e2　　Content-Disposition: form-data; name="img"; filename="image.jpg"　　Content-Type: image/jpeg　　(此处省略jpeg文件二进制数据...）　　-------------------------------7db372eb000e2--

此内容必须一字不差，包括最后的回车，红色字体部分就是协议的头。给服务器上传数据时，并非协议头每个字段都得说明，其中，content-type是必须的，它包括一个类似标志性质的名为boundary的标志，它可以是随便输入的字符串。对后面的具体内容也是必须的。它用来分辨一段内容的开始。Content-Length:
3693 ，这里的3693是要上传文件的总长度。绿色字体部分就是需要上传的数据，可以是文本，也可以是图片等。数据内容前面需要有Content-Disposition, Content-Type以及Content-Transfer-Encoding等说明字段。最后的紫色部分就是协议的结尾了。

注意这一行：

　　Content-Type: multipart/form-data; boundary=---------------------------7db372eb000e2　　

　　根据 rfc1867, multipart/form-data是必须的.

　　---------------------------7db372eb000e2 是分隔符，分隔多个文件、表单项。其中b372eb000e2 是即时生成的一个数字，用以确保整个分隔符不会在文件或表单项的内容中出现。Form每个部分用分隔符分割，分隔符之前必须加上"--"着两个字符(即--{boundary})才能被http协议认为是Form的分隔符，表示结束的话用在正确的分隔符后面添加"--"表示结束。

　　前面的 ---------------------------7d 是 IE 特有的标志,Mozila 为---------------------------71.

　　每个分隔的数据的都可以用Content-Type来表示下面数据的类型，可以参考rfc1341(http://www.ietf.org/rfc/rfc1341.txt)

　　例如 ：Contect-Type:image/jpeg 表示下面的数据是jpeg文件数据。

二、客户端源码

MainActivity.java

package com.fg.activity;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import com.fg.util.UploadUtil;
import com.fg.util.UploadUtil.OnUploadProcessListener;

/**
* @author ICQwlj<br>
* Email :wlj250237@126.com<br>
* 说明：主要用于选择文件和上传文件操作
*/
public class MainActivity extends Activity implements OnClickListener,OnUploadProcessListener{
private static final String TAG = "uploadImage";

/**
* 去上传文件
*/
protected static final int TO_UPLOAD_FILE = 1;
/**
* 上传文件响应
*/
protected static final int UPLOAD_FILE_DONE = 2;  //
/**
* 选择文件
*/
public static final int TO_SELECT_PHOTO = 3;
/**
* 上传初始化
*/
private static final int UPLOAD_INIT_PROCESS = 4;
/**
* 上传中
*/
private static final int UPLOAD_IN_PROCESS = 5;
/***
* 这里的这个URL是我服务器的javaEE环境URL
*/
private static String requestURL = "http://172.31.8.6:8080/fileUpload/file_upload";
private Button selectButton,uploadButton;
private ImageView imageView;
private TextView uploadImageResult;

private String picPath = null;
private ProgressDialog progressDialog;

/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
initView();
}

/**
* 初始化数据
*/
private void initView() {
selectButton = (Button) this.findViewById(R.id.selectImage);
uploadButton = (Button) this.findViewById(R.id.uploadImage);
selectButton.setOnClickListener(this);
uploadButton.setOnClickListener(this);
imageView = (ImageView) this.findViewById(R.id.imageView);
uploadImageResult = (TextView) findViewById(R.id.uploadImageResult);
progressDialog = new ProgressDialog(this);
}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.selectImage:
Intent intent = new Intent(this,SelectPicActivity.class);
startActivityForResult(intent, TO_SELECT_PHOTO);
break;
case R.id.uploadImage:
if(picPath!=null)
{
handler.sendEmptyMessage(TO_UPLOAD_FILE);
}else{
Toast.makeText(this, "上传的文件路径出错", Toast.LENGTH_LONG).show();
}
break;
default:
break;
}
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(resultCode==Activity.RESULT_OK && requestCode == TO_SELECT_PHOTO)
{
picPath = data.getStringExtra(SelectPicActivity.KEY_PHOTO_PATH);
Log.i(TAG, "最终选择的图片="+picPath);
Bitmap bm = BitmapFactory.decodeFile(picPath);
imageView.setImageBitmap(bm);
//更新图库			Uri localUri = Uri.fromFile(new File(picPath));
Intent localIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, localUri);
sendBroadcast(localIntent);
}
super.onActivityResult(requestCode, resultCode, data);
}

/**
* 上传服务器响应回调
*/
@Override
public void onUploadDone(int responseCode, String message) {
progressDialog.dismiss();
Message msg = Message.obtain();
msg.what = UPLOAD_FILE_DONE;
msg.arg1 = responseCode;
msg.obj = message;
handler.sendMessage(msg);
}

private void toUploadFile()
{
uploadImageResult.setText("正在上传中...");
progressDialog.setMessage("正在上传文件...");
progressDialog.show();
String fileKey = "img";
UploadUtil uploadUtil = UploadUtil.getInstance();
uploadUtil.setOnUploadProcessListener(this);  //设置监听器监听上传状态

Map<String, String> params = new HashMap<String, String>();
params.put("orderId", "11111");
uploadUtil.uploadFile( picPath,fileKey, requestURL,params);
}

@Override
public void onUploadProcess(int uploadSize) {
Message msg = Message.obtain();
msg.what = UPLOAD_IN_PROCESS;
msg.arg1 = uploadSize;
handler.sendMessage(msg);
}

@Override
public void initUpload(int fileSize) {
Message msg = Message.obtain();
msg.what = UPLOAD_INIT_PROCESS;
msg.arg1 = fileSize;
handler.sendMessage(msg );
}

private Handler handler = new Handler(){
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case TO_UPLOAD_FILE:
toUploadFile();
break;
case UPLOAD_INIT_PROCESS:
break;
case UPLOAD_IN_PROCESS:
break;
case UPLOAD_FILE_DONE:
String result = "响应码："+msg.arg1+"\n响应信息："+msg.obj+"\n耗时："+UploadUtil.getRequestTime()+"秒";
uploadImageResult.setText(result);
break;							default:
break;
}
super.handleMessage(msg);
}
};
}

SelectPicActivity.java

package com.fg.activity;

import android.app.Activity;
import android.content.ContentValues;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.provider.MediaStore;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.Toast;

/**
* @author ICQwlj<br>
* Email :wlj250237@126.com<br>
* 说明：主要用于选择文件操作
*/

public class SelectPicActivity extends Activity implements OnClickListener{

/***
* 使用照相机拍照获取图片
*/
public static final int SELECT_PIC_BY_TACK_PHOTO = 1;
/***
* 使用相册中的图片
*/
public static final int SELECT_PIC_BY_PICK_PHOTO = 2;

/***
* 从Intent获取图片路径的KEY
*/
public static final String KEY_PHOTO_PATH = "photo_path";

private static final String TAG = "SelectPicActivity";

private LinearLayout dialogLayout;
private Button takePhotoBtn,pickPhotoBtn,cancelBtn;

/**获取到的图片路径*/
private String picPath;

private Intent lastIntent ;

private Uri photoUri;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.select_pic_layout);
initView();
}
/**
* 初始化加载View
*/
private void initView() {
dialogLayout = (LinearLayout) findViewById(R.id.dialog_layout);
dialogLayout.setOnClickListener(this);
takePhotoBtn = (Button) findViewById(R.id.btn_take_photo);
takePhotoBtn.setOnClickListener(this);
pickPhotoBtn = (Button) findViewById(R.id.btn_pick_photo);
pickPhotoBtn.setOnClickListener(this);
cancelBtn = (Button) findViewById(R.id.btn_cancel);
cancelBtn.setOnClickListener(this);

lastIntent = getIntent();
}

@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.dialog_layout:
finish();
break;
case R.id.btn_take_photo:
takePhoto();
break;
case R.id.btn_pick_photo:
pickPhoto();
break;
default:
finish();
break;
}
}

/**
* 拍照获取图片
*/
private void takePhoto() {
//执行拍照前，应该先判断SD卡是否存在
String SDState = Environment.getExternalStorageState();
if(SDState.equals(Environment.MEDIA_MOUNTED))
{

Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);//"android.media.action.IMAGE_CAPTURE"
/***
* 需要说明一下，以下操作使用照相机拍照，拍照后的图片会存放在相册中的
* 这里使用的这种方式有一个好处就是获取的图片是拍照后的原图
* 如果不实用ContentValues存放照片路径的话，拍照后获取的图片为缩略图不清晰
*/
ContentValues values = new ContentValues();
photoUri = this.getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, values);
intent.putExtra(android.provider.MediaStore.EXTRA_OUTPUT, photoUri);
/**-----------------*/
startActivityForResult(intent, SELECT_PIC_BY_TACK_PHOTO);
}else{
Toast.makeText(this,"内存卡不存在", Toast.LENGTH_LONG).show();
}
}

/***
* 从相册中取图片
*/
private void pickPhoto() {
Intent intent = new Intent();
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(intent, SELECT_PIC_BY_PICK_PHOTO);
}

@Override
public boolean onTouchEvent(MotionEvent event) {
finish();
return super.onTouchEvent(event);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if(resultCode == Activity.RESULT_OK)
{
doPhoto(requestCode,data);
}
super.onActivityResult(requestCode, resultCode, data);
}

/**
* 选择图片后，获取图片的路径
* @param requestCode
* @param data
*/
private void doPhoto(int requestCode,Intent data)
{
if(requestCode == SELECT_PIC_BY_PICK_PHOTO )  //从相册取图片，有些手机有异常情况，请注意
{
if(data == null)
{
Toast.makeText(this, "选择图片文件出错", Toast.LENGTH_LONG).show();
return;
}
photoUri = data.getData();
if(photoUri == null )
{
Toast.makeText(this, "选择图片文件出错", Toast.LENGTH_LONG).show();
return;
}
}
String[] pojo = {MediaStore.Images.Media.DATA};
Cursor cursor = managedQuery(photoUri, pojo, null, null,null);
if(cursor != null )
{
int columnIndex = cursor.getColumnIndexOrThrow(pojo[0]);
cursor.moveToFirst();
picPath = cursor.getString(columnIndex);
cursor.close();
}
Log.i(TAG, "imagePath = "+picPath);
if(picPath != null && ( picPath.endsWith(".png") || picPath.endsWith(".PNG") ||picPath.endsWith(".jpg") ||picPath.endsWith(".JPG")  ))
{
lastIntent.putExtra(KEY_PHOTO_PATH, picPath);
setResult(Activity.RESULT_OK, lastIntent);
finish();
}else{
Toast.makeText(this, "选择图片文件不正确", Toast.LENGTH_LONG).show();
}
}
}

UploadUtil.java

package com.fg.util;

import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Iterator;
import java.util.Map;
import java.util.UUID;

import android.util.Log;

/**
*
* 上传工具类
* @author ICQwlj<br>
* Email :wlj250237@126.com<br>
* 支持上传文件和参数
*/
public class UploadUtil {
private static UploadUtil uploadUtil;
private static final String BOUNDARY =  UUID.randomUUID().toString(); // 边界标识 随机生成
private static final String PREFIX = "--";
private static final String LINE_END = "\r\n";
private static final String CONTENT_TYPE = "multipart/form-data"; // 内容类型
private UploadUtil() {

}

/**
* 单例模式获取上传工具类
* @return
*/
public static UploadUtil getInstance() {
if (null == uploadUtil) {
uploadUtil = new UploadUtil();
}
return uploadUtil;
}

private static final String TAG = "UploadUtil";
private int readTimeOut = 10 * 1000; // 读取超时
private int connectTimeout = 10 * 1000; // 超时时间

/***
* 请求使用多长时间
*/
private static int requestTime = 0;

private static final String CHARSET = "utf-8"; // 设置编码

/***
* 上传成功
*/
public static final int UPLOAD_SUCCESS_CODE = 1;

/**
* 文件不存在
*/
public static final int UPLOAD_FILE_NOT_EXISTS_CODE = 2;

/**
* 服务器出错
*/
public static final int UPLOAD_SERVER_ERROR_CODE = 3;
protected static final int WHAT_TO_UPLOAD = 1;
protected static final int WHAT_UPLOAD_DONE = 2;

/**
* android上传文件到服务器
*
* @param filePath
*            需要上传的文件的路径
* @param fileKey
*            在网页上<input type=file name=xxx/> xxx就是这里的fileKey
* @param RequestURL
*            请求的URL
*/
public void uploadFile(String filePath, String fileKey, String RequestURL, Map<String, String> param) {
if (filePath == null) {
sendMessage(UPLOAD_FILE_NOT_EXISTS_CODE,"文件不存在");
return;
}
try {
File file = new File(filePath);
uploadFile(file, fileKey, RequestURL, param);
} catch (Exception e) {
sendMessage(UPLOAD_FILE_NOT_EXISTS_CODE,"文件不存在");
e.printStackTrace();
return;
}
}

/**
* android上传文件到服务器
*
* @param file
*            需要上传的文件
* @param fileKey
*            在网页上<input type=file name=xxx/> xxx就是这里的fileKey
* @param RequestURL
*            请求的URL
*/
public void uploadFile(final File file, final String fileKey, final String RequestURL, final Map<String, String> param) {
if (file == null || (!file.exists())) {
sendMessage(UPLOAD_FILE_NOT_EXISTS_CODE,"文件不存在");
return;
}

Log.i(TAG, "请求的URL=" + RequestURL);
Log.i(TAG, "请求的fileName=" + file.getName());
Log.i(TAG, "请求的fileKey=" + fileKey);
new Thread(new Runnable() {  //开启线程上传文件
@Override
public void run() {
toUploadFile(file, fileKey, RequestURL, param);
}
}).start();

}

private void toUploadFile(File file, String fileKey, String RequestURL, Map<String, String> param) {
String result = null;
requestTime= 0;

long requestTime = System.currentTimeMillis();
long responseTime = 0;

try {
URL url = new URL(RequestURL);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(readTimeOut);
conn.setConnectTimeout(connectTimeout);
conn.setDoInput(true); // 允许输入流
conn.setDoOutput(true); // 允许输出流
conn.setUseCaches(false); // 不允许使用缓存
conn.setRequestMethod("POST"); // 请求方式
conn.setRequestProperty("Charset", CHARSET); // 设置编码
conn.setRequestProperty("connection", "keep-alive");
conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");
conn.setRequestProperty("Content-Type", CONTENT_TYPE + ";boundary=" + BOUNDARY);

/**
* 当文件不为空，把文件包装并且上传
*/
DataOutputStream dos = new DataOutputStream(conn.getOutputStream());
StringBuffer sb = null;
String params = "";

/***
* 以下是用于上传参数
*/
if (param != null && param.size() > 0) {
Iterator<String> it = param.keySet().iterator();
while (it.hasNext()) {
sb = null;
sb = new StringBuffer();
String key = it.next();
String value = param.get(key);
sb.append(PREFIX).append(BOUNDARY).append(LINE_END);
sb.append("Content-Disposition: form-data; name=\"").append(key).append("\"").append(LINE_END).append(LINE_END);
sb.append(value).append(LINE_END);
params = sb.toString();
Log.i(TAG, key+"="+params+"##");
dos.write(params.getBytes());
}
}

sb = null;
params = null;
sb = new StringBuffer();
/**
* 这里重点注意： name里面的值为服务器端需要key 只有这个key 才可以得到对应的文件
* filename是文件的名字，包含后缀名的 比如:abc.png
*/
sb.append(PREFIX).append(BOUNDARY).append(LINE_END);
sb.append("Content-Disposition:form-data; name=\"" + fileKey
+ "\"; filename=\"" + file.getName() + "\"" + LINE_END);
sb.append("Content-Type:image/pjpeg" + LINE_END); // 这里配置的Content-type很重要的 ，用于服务器端辨别文件的类型的
sb.append(LINE_END);
params = sb.toString();
sb = null;

Log.i(TAG, file.getName()+"=" + params+"##");
dos.write(params.getBytes());
/**上传文件*/
InputStream is = new FileInputStream(file);
onUploadProcessListener.initUpload((int)file.length());
byte[] bytes = new byte[1024];
int len = 0;
int curLen = 0;
while ((len = is.read(bytes)) != -1) {
curLen += len;
dos.write(bytes, 0, len);
onUploadProcessListener.onUploadProcess(curLen);
}
is.close();

dos.write(LINE_END.getBytes());
byte[] end_data = (PREFIX + BOUNDARY + PREFIX + LINE_END).getBytes();
dos.write(end_data);
dos.flush();
/**
* 获取响应码 200=成功 当响应成功，获取响应的流
*/
int res = conn.getResponseCode();
responseTime = System.currentTimeMillis();
this.requestTime = (int) ((responseTime-requestTime)/1000);
Log.e(TAG, "response code:" + res);
if (res == 200) {
Log.e(TAG, "request success");
InputStream input = conn.getInputStream();
StringBuffer sb1 = new StringBuffer();
int ss;
while ((ss = input.read()) != -1) {
sb1.append((char) ss);
}
result = sb1.toString();
Log.e(TAG, "result : " + result);
sendMessage(UPLOAD_SUCCESS_CODE, "上传结果："
+ result);
return;
} else {
Log.e(TAG, "request error");
sendMessage(UPLOAD_SERVER_ERROR_CODE,"上传失败：code=" + res);
return;
}
} catch (MalformedURLException e) {
sendMessage(UPLOAD_SERVER_ERROR_CODE,"上传失败：error=" + e.getMessage());
e.printStackTrace();
return;
} catch (IOException e) {
sendMessage(UPLOAD_SERVER_ERROR_CODE,"上传失败：error=" + e.getMessage());
e.printStackTrace();
return;
}
}

/**
* 发送上传结果
* @param responseCode
* @param responseMessage
*/
private void sendMessage(int responseCode,String responseMessage)
{
onUploadProcessListener.onUploadDone(responseCode, responseMessage);
}

/**
* 下面是一个自定义的回调函数，用到回调上传文件是否完成
*
* @author shimingzheng
*
*/
public static interface OnUploadProcessListener {
/**
* 上传响应
* @param responseCode
* @param message
*/
void onUploadDone(int responseCode, String message);
/**
* 上传中
* @param uploadSize
*/
void onUploadProcess(int uploadSize);
/**
* 准备上传
* @param fileSize
*/
void initUpload(int fileSize);
}
private OnUploadProcessListener onUploadProcessListener;

public void setOnUploadProcessListener(
OnUploadProcessListener onUploadProcessListener) {
this.onUploadProcessListener = onUploadProcessListener;
}

public int getReadTimeOut() {
return readTimeOut;
}

public void setReadTimeOut(int readTimeOut) {
this.readTimeOut = readTimeOut;
}

public int getConnectTimeout() {
return connectTimeout;
}

public void setConnectTimeout(int connectTimeout) {
this.connectTimeout = connectTimeout;
}
/**
* 获取上传使用的时间
* @return
*/
public static int getRequestTime() {
return requestTime;
}

public static interface uploadProcessListener{
}
}

AndroidMainfest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.fg.activity"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="10" />
<!-- 权限赋予 -->
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS" />
<uses-permission android:name="android.permission.READ_LOGS" />

<application android:icon="@drawable/logo" android:label="@string/app_name">
<activity android:name=".MainActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".SelectPicActivity" android:theme="@style/DialogStyleBottom"/>

</application>
</manifest>

三、服务器源码
FileUpload.java

package com.zhangke.action;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.text.DecimalFormat;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

/***
* 文件上传例子   resource code encoding is utf-8
* <br>主要为了android客户端实现功能   代码写的乱   请大家见谅
* @author ICQwlj<br>
* Email :wlj250237@126.com<br>
*
*/
public class FileUpload extends ActionSupport {

private String savePath;
/**这里的名字和html的名字必须对称*/
private File img;
/**要上传的文件类型*/
private String imgContentType;
/**文件的名称*/
private String imgFileName;

private String orderId;
public String getSavePath() {
return ServletActionContext.getServletContext().getRealPath(savePath);
}

public File getImg() {
return img;
}

public String getImgFileName() {
return imgFileName;
}

public void setSavePath(String value) {
this.savePath = value;
}

public void setImgFileName(String imgFileName) {
this.imgFileName = imgFileName;
}

public void setImg(File img) {
this.img = img;
}

public String getImgContentType() {
return imgContentType;
}

public void setImgContentType(String imgContentType) {
this.imgContentType = imgContentType;
}

public String getOrderId() {
return orderId;
}

public void setOrderId(String orderId) {
this.orderId = orderId;
}
/**
* 指定的上传类型zip和图片格式的文件
*/
private static final String[] types = { "application/x-zip-compressed",
"ZIP", "image/pjpeg","image/x-png","image/jpeg","image/png" };  //"application/octet-stream; charset=utf-8",

/***
* 判断文件的类型是否为指定的文件类型
* @return
*/
public boolean filterType() {
boolean isFileType = false;
String fileType = getImgContentType();
System.out.println(fileType);
for (String type : types) {
if (type.equals(fileType)) {
isFileType = true;
break;
}
}
return isFileType;
}

/**
* 取得文件夹大小
*
* @param f
* @return
* @throws Exception
*/
public long getFileSize(File f) throws Exception {
return f.length();
}

public String FormetFileSize(long fileS) {// 转换文件大小
DecimalFormat df = new DecimalFormat("#.00");
String fileSizeString = "";
if (fileS < 1024) {
fileSizeString = df.format((double) fileS) + "B";
} else if (fileS < 1048576) {
fileSizeString = df.format((double) fileS / 1024) + "K";
} else if (fileS < 1073741824) {
fileSizeString = df.format((double) fileS / 1048576) + "M";
} else {
fileSizeString = df.format((double) fileS / 1073741824) + "G";
}
return fileSizeString;
}

/**
* 上传文件操作
*
* @return
* @throws Exception
*/
public String upload() throws Exception {

String ct  =  ServletActionContext.getRequest().getHeader("Content-Type");
System.out.println("Content-Type="+ct);
String result = "unknow error";
System.out.println("orderId="+getOrderId());
PrintWriter out = ServletActionContext.getResponse().getWriter();
if (!filterType()) {
System.out.println("文件类型不正确");
ServletActionContext.getRequest().setAttribute("typeError",
"您要上传的文件类型不正确");

result = "error:" + getImgContentType() + " type not upload file type";
} else {
System.out.println("当前文件大小为："
+ FormetFileSize(getFileSize(getImg())));
FileOutputStream fos = null;
FileInputStream fis = null;
try {
// 保存文件那一个路径
fos = new FileOutputStream(getSavePath() + "\\"
+ getImgFileName());
fis = new FileInputStream(getImg());
byte[] buffer = new byte[1024];
int len = 0;
while ((len = fis.read(buffer)) > 0) {
fos.write(buffer, 0, len);
}
result = "upload file success !";
} catch (Exception e) {
result = "upload file failed ! ";
e.printStackTrace();
} finally {
fos.close();
fis.close();
}
}
out.print(result);
return null;
}
}

struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
<constant name="struts.custom.i18n.resources" value="globalMessages"/>
<constant name="struts.i18n.encoding" value="utf-8"/>
<!-- 服务器指定一个临时的路径，这里使用了绝对路径，大家根据自己的Tomcat路径自行设置，否则会上传失败 -->
<constant name="struts.multipart.saveDir" value="D:\apache-tomcat-6.0.35/temp"/>
<constant name="struts.multipart.maxSize" value="30000000"></constant>
<package name="lee" extends="struts-default">
<action name="file_*" class="com.zhangke.action.FileUpload" method="{1}">
<interceptor-ref name="fileUpload">
<!--<param name="allowedTypes">application/zip,application/octet-stream</param>-->
<param name="maximumSize">524288000</param>
</interceptor-ref>
<interceptor-ref name="defaultStack"/>
<!-- 保存路径为当前项目WebRoot/upload -->
<param name="savePath">/upload</param>
<result name="success">index.jsp</result>
<result name="input">index.jsp</result>
</action>
</package>
</struts>

四、效果图





五、完整的代码：http://download.csdn.net/detail/wlj142/7594879。其中，代码参考借鉴了蛮多人，在此就不一一例举了。
PS：如果是在本地服务器上调试代码，个人有以下几点建议：

1、最好拿真机来跑Android程序，因为有些时候，模拟器上报错是因为模拟器的某些硬件不支持，毕竟最后要拿到真机上运行。而且，用真机运行程序还有一个好处，就是运行速度快，加载模拟器的时间实在是不敢恭维；

2、如果自身的服务器没有对外IP，则需要通过将本地服务器与真机同时连接到一个无线路由里面，由路由器统一分配IP，然后再在客户端里面的访问HTTP的URL中，将IP改为服务器所获得到的IP地址即可。当然，也可以使用10.0.2.2来访问本地服务器，不过得通过USB线连接真机。

以上是个人看法，仅供参考。