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

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

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前台android与后台Servlet交互---上传文件_第1张图片

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