Android端上传文件到Web服务器

本文中主要就Android端上传文件到Web服务器，做出的一个简单的Demo

1、Tomcat上部署的服务端的实现
2、Android端的代码实现

1、Tomcat服务器上面项目的部署与实现
创建一个Web Project
创建FileUploadServlet.java，当然，一下两个重要的Jar包不能够忘记！
commons-fileupload-1.2.2.jar
commons-io-2.0.1.jar

FileUploadServlet.java

import java.io.File;import java.io.IOException;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.FileItemFactory;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;public class FileUpLoadServlet extends HttpServlet {    private static final long serialVersionUID = 1L;    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        doPost(request, response);    }    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {         boolean isMultipart = ServletFileUpload.isMultipartContent(request);         if (isMultipart) {         String realpath = request.getSession().getServletContext()                 .getRealPath("/files");         System.out.println(realpath);         File dir = new File(realpath);         if (!dir.exists())             dir.mkdirs();         FileItemFactory factory = new DiskFileItemFactory();         ServletFileUpload upload = new ServletFileUpload(factory);         upload.setHeaderEncoding("UTF-8");         try {             @SuppressWarnings("unchecked")            List<FileItem> items = upload.parseRequest(request);             for (FileItem item : items) {                 if (item.isFormField()) {                     String name1 = item.getFieldName();// 得到请求参数的名称                     String value = item.getString("UTF-8");// 得到参数值                     System.out.println(name1 + "=" + value);                 } else {                     item.write(new File(dir, System.currentTimeMillis()                             + item.getName().substring(                                     item.getName().lastIndexOf("."))));                 }             }         } catch (Exception e) {             e.printStackTrace();         }     }    }}

Web.xml的配置

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">  <display-name></display-name>  <servlet>    <servlet-name>FileUpLoadServlet</servlet-name>    <servlet-class>com.fileupload.FileUpLoadServlet</servlet-class>  </servlet>  <servlet-mapping>    <servlet-name>FileUpLoadServlet</servlet-name>    <url-pattern>/FileUpLoadServlet</url-pattern>  </servlet-mapping>  <welcome-file-list>    <welcome-file>index.jsp</welcome-file>  </welcome-file-list></web-app>

2、Android端的代码实现
AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.fileuploadtoserver"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="16"        android:targetSdkVersion="21" />    <uses-permission android:name="android.permission.INTERNET"/>    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <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>    </application></manifest>

activity_main.xml

<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" >    <EditText        android:id="@+id/et_uploadpath"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:hint="请输入上传的文件路径" />    <Button         android:onClick="upload"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="上传文件"/></LinearLayout>

导入开源项目：com.loopj.android.http；可以再Github上下载
Git地址：https://github.com/loopj/android-async-http

MainActivity.java

import java.io.File;import java.io.FileNotFoundException;import org.apache.http.Header;import com.loopj.android.http.AsyncHttpClient;import com.loopj.android.http.AsyncHttpResponseHandler;import com.loopj.android.http.RequestParams;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.EditText;import android.widget.Toast;public class MainActivity extends Activity {    private EditText et_path;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        et_path = (EditText) this.findViewById(R.id.et_uploadpath);    }    public void upload(View view) throws FileNotFoundException {        String path = et_path.getText().toString().trim();        String server_upload_path = "http://192.168.3.36:8080/AndroidWebServerDemo1/FileUpLoadServlet";        File file = new File(path);        if(file.exists() && file.length() > 0) {            AsyncHttpClient client = new AsyncHttpClient();             RequestParams params = new RequestParams();            params.put("tempfile", file);            client.post(server_upload_path, params, new AsyncHttpResponseHandler() {                @Override                public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {                    Toast.makeText(getApplicationContext(), "上传成功", 0).show();                }                @Override                public void onFailure(int statusCode, Header[] headers,                        byte[] responseBody, Throwable error) {                    Toast.makeText(getApplicationContext(), "上传失败", 0).show();                }            });        } else {            Toast.makeText(getApplicationContext(), "无效路径", 0).show();        }    }}

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