前台android与后台Servlet交互---上传文件

android使用开源项目 https://github.com/loopj/android-async-http 发送文件给后台Servlet

前台Android代码：

activity_main.xml文件

<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <EditText
        android:id="@+id/editText"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />
    
    <Button 
		android:onClick="click"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="上传"/>

</LinearLayout>

MainActivity.java文件

import java.io.File;

import org.apache.http.Header;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;
import com.loopj.android.http.RequestParams;

public class MainActivity extends Activity {

	private EditText editText = null;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
	
		editText = (EditText) findViewById(R.id.editText);
	}
	
	public void click(View view){
		
		AsyncHttpClient client = new AsyncHttpClient();
		
		String url = "http://192.168.120.1:8080/AndroidFileUpload/UpLoadServlet";
		
		String path = editText.getText().toString().trim();
		File file = new File(path);
		
		if(file.exists() && file.length() > 0){
			RequestParams params = new RequestParams();
			try {
				params.put("profile_picture", file);
			} catch (Exception e) {
				e.printStackTrace();
			}
			
			client.post(url, params, new AsyncHttpResponseHandler(){

				@Override
				public void onSuccess(int statusCode, Header[] headers,
						byte[] responseBody) {
					Toast.makeText(MainActivity.this, "上传成功", 0).show();
					
				}

				@Override
				public void onFailure(int statusCode, Header[] headers,
						byte[] responseBody, Throwable error) {
					Toast.makeText(MainActivity.this, "上传失败", 0).show();
					
				}
			});
		}else {
			Toast.makeText(MainActivity.this, "文件不存在", 0).show();
			
		}
	}
}

后台Servlet代码：

import java.io.File;
import java.io.IOException;
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.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class UpLoadServlet extends HttpServlet {


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

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		boolean isMultipart = ServletFileUpload.isMultipartContent(request);
		if(isMultipart){
			String realPath = this.getServletContext().getRealPath("upload");
			
			System.out.println(realPath);
			
			File dir = new File(realPath);
			
			if(!dir.exists()){
				dir.mkdir();
			}
			
			DiskFileItemFactory factory = new DiskFileItemFactory();
			ServletFileUpload upload = new ServletFileUpload(factory);
			
			upload.setHeaderEncoding("utf-8");
			
			try {
				List<FileItem> items = upload.parseRequest(request);
				 
				for(FileItem item : items){
					if(item.isFormField()){	//username="username"
						String name = item.getFieldName();
						String value = item.getString("utf-8");
						
						System.out.println(name + " = " + value);
					} else { //文件
						String name = item.getName();
						item.write(new File(dir, System.currentTimeMillis() + name.substring(name.lastIndexOf("."))));
						
					}
					
				}
				
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
}

至于后台若使用Struts2接收文件，该怎样编写代码，还未测试成功......求指教