Android实现上传文件到服务器实例详解

本实例实现每隔5秒上传一次，通过服务器端获取手机上传过来的文件信息并做相应处理；采用Android+Struts2技术。

一、Android端实现文件上传
1)、新建一个Android项目命名为androidUpload，目录结构如下：

2)、新建FormFile类，用来封装文件信息

package com.ljq.utils;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;


public class FormFile {
  
  private byte[] data;
  private InputStream inStream;
  private File file;
  
  private String filname;
  
  private String parameterName;
  
  private String contentType = "application/octet-stream";
  
  public FormFile(String filname, byte[] data, String parameterName, String contentType) {
    this.data = data;
    this.filname = filname;
    this.parameterName = parameterName;
    if(contentType!=null) this.contentType = contentType;
  }
  
  public FormFile(String filname, File file, String parameterName, String contentType) {
    this.filname = filname;
    this.parameterName = parameterName;
    this.file = file;
    try {
      this.inStream = new FileInputStream(file);
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    }
    if(contentType!=null) this.contentType = contentType;
  }
  
  public File getFile() {
    return file;
  }

  public InputStream getInStream() {
    return inStream;
  }

  public byte[] getData() {
    return data;
  }

  public String getFilname() {
    return filname;
  }

  public void setFilname(String filname) {
    this.filname = filname;
  }

  public String getParameterName() {
    return parameterName;
  }

  public void setParameterName(String parameterName) {
    this.parameterName = parameterName;
  }

  public String getContentType() {
    return contentType;
  }

  public void setContentType(String contentType) {
    this.contentType = contentType;
  }
  
}

3）、新建SocketHttpRequester类，封装上传文件到服务器代码

package com.ljq.utils;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.Socket;
import java.net.URL;
import java.util.Map;


public class SocketHttpRequester {
  
  public static boolean post(String path, Map params, FormFile[] files) throws Exception{   
    final String BOUNDARY = "---------------------------7da2137580612"; //数据分隔线
    final String endline = "--" + BOUNDARY + "--rn";//数据结束标志
    
    int fileDataLength = 0;
    for(FormFile uploadFile : files){//得到文件类型数据的总长度
      StringBuilder fileExplain = new StringBuilder();
fileExplain.append("--");
fileExplain.append(BOUNDARY);
fileExplain.append("rn");
fileExplain.append("Content-Disposition: form-data;name=""+ uploadFile.getParameterName()+"";filename=""+ uploadFile.getFilname() + ""rn");
fileExplain.append("Content-Type: "+ uploadFile.getContentType()+"rnrn");
fileExplain.append("rn");
fileDataLength += fileExplain.length();
      if(uploadFile.getInStream()!=null){
 fileDataLength += uploadFile.getFile().length();
}else{
  fileDataLength += uploadFile.getData().length;
}
    }
    StringBuilder textEntity = new StringBuilder();
    for (Map.Entry entry : params.entrySet()) {//构造文本类型参数的实体数据
      textEntity.append("--");
      textEntity.append(BOUNDARY);
      textEntity.append("rn");
      textEntity.append("Content-Disposition: form-data; name=""+ entry.getKey() + ""rnrn");
      textEntity.append(entry.getValue());
      textEntity.append("rn");
    }
    //计算传输给服务器的实体数据总长度
    int dataLength = textEntity.toString().getBytes().length + fileDataLength + endline.getBytes().length;
    
    URL url = new URL(path);
    int port = url.getPort()==-1 ? 80 : url.getPort();
    Socket socket = new Socket(InetAddress.getByName(url.getHost()), port);      
    OutputStream outStream = socket.getOutputStream();
    //下面完成HTTP请求头的发送
    String requestmethod = "POST "+ url.getPath()+" HTTP/1.1rn";
    outStream.write(requestmethod.getBytes());
    String accept = "Accept: image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, *
  public static boolean post(String path, Map params, FormFile file) throws Exception{
    return post(path, params, new FormFile[]{file});
  }
}

4)、新建MainActivity类，实现每隔5秒上传一次

package com.ljq.activity;

import java.io.File;
import java.util.HashMap;
import java.util.Map;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.util.Log;

import com.ljq.utils.FormFile;
import com.ljq.utils.SocketHttpRequester;

public class MainActivity extends Activity {
  private File file;
  private Handler handler;
  private static final String TAG="MainActivity";

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    Log.i(TAG, "onCreate");
    
    file = new File(Environment.getExternalStorageDirectory(), "123.rmvb");
    Log.i(TAG, "照片文件是否存在："+file);
    handler=new Handler();
    handler.post(runnable);
  }
  
  Runnable runnable=new Runnable() {
  
    public void run() {
      Log.i(TAG, "runnable run");
      uploadFile(file);
      handler.postDelayed(runnable, 5000);
    }
  
  };
  
  
  public void uploadFile(File imageFile) {
    Log.i(TAG, "upload start");
    try {
      String requestUrl = "http://192.168.1.101:8083/upload/upload/execute.do";
      //请求普通信息
      Map params = new HashMap();
      params.put("username", "张三");
      params.put("pwd", "zhangsan");
      params.put("age", "21");
      params.put("fileName", imageFile.getName());
      //上传文件
      FormFile formfile = new FormFile(imageFile.getName(), imageFile, "image", "application/octet-stream");
      
      SocketHttpRequester.post(requestUrl, params, formfile);
      Log.i(TAG, "upload success");
    } catch (Exception e) {
      Log.i(TAG, "upload error");
      e.printStackTrace();
    }
    Log.i(TAG, "upload end");
  }
}

5)、修改清单文件

启动模拟器，运行如下：

二、服务器端用来获取Android端上传过来的文件信息

1)、新建一个web项目命名为upload，目录结构如下

注意：记得加入struts2 jar包，需加入的jar如下

2)、新建action类，命名为UploadAction，内容如下

package com.ljq.action;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;


@SuppressWarnings("serial")
public class UploadAction extends ActionSupport {
  // 上传文件域
  private File image;
  // 上传文件类型
  private String imageContentType;
  // 封装上传文件名
  private String imageFileName;
  // 接受依赖注入的属性
  private String savePath;

  @Override
  public String execute() {
    HttpServletRequest request=ServletActionContext.getRequest();
    FileOutputStream fos = null;
    FileInputStream fis = null;
    try {
      System.out.println("获取Android端传过来的普通信息：");
      System.out.println("用户名："+request.getParameter("username"));
      System.out.println("密码："+request.getParameter("pwd"));
      System.out.println("年龄："+request.getParameter("age"));
      System.out.println("文件名："+request.getParameter("fileName"));
      System.out.println("获取Android端传过来的文件信息：");
      System.out.println("文件存放目录: "+getSavePath());
      System.out.println("文件名称: "+imageFileName);
      System.out.println("文件大小: "+image.length());
      System.out.println("文件类型: "+imageContentType);
      
      fos = new FileOutputStream(getSavePath() + "/" + getImageFileName());
      fis = new FileInputStream(getImage());
      byte[] buffer = new byte[1024];
      int len = 0;
      while ((len = fis.read(buffer)) != -1) {
 fos.write(buffer, 0, len);
      }
      System.out.println("文件上传成功");
    } catch (Exception e) {
      System.out.println("文件上传失败");
      e.printStackTrace();
    } finally {
      close(fos, fis);
    }
    return SUCCESS;
  }

  
  public String getSavePath() throws Exception{
    return ServletActionContext.getServletContext().getRealPath(savePath); 
  }

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

  public File getImage() {
    return image;
  }

  public void setImage(File image) {
    this.image = image;
  }

  public String getImageContentType() {
    return imageContentType;
  }

  public void setImageContentType(String imageContentType) {
    this.imageContentType = imageContentType;
  }

  public String getImageFileName() {
    return imageFileName;
  }

  public void setImageFileName(String imageFileName) {
    this.imageFileName = imageFileName;
  }

  private void close(FileOutputStream fos, FileInputStream fis) {
    if (fis != null) {
      try {
 fis.close();
 fis=null;
      } catch (IOException e) {
 System.out.println("FileInputStream关闭失败");
 e.printStackTrace();
      }
    }
    if (fos != null) {
      try {
 fos.close();
 fis=null;
      } catch (IOException e) {
 System.out.println("FileOutputStream关闭失败");
 e.printStackTrace();
      }
    }
  }

}

3)、配置struts.xml

  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
    
      
      /image
      /WEB-INF/page/message.jsp
    
  

4)、配置web.xml

  
    struts2
    
      org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter
    
  
  
    struts2
    /*
  
  
  
    strutsCleanup
    
      org.apache.struts2.dispatcher.ActionContextCleanUp
    
  
  
    strutsCleanup
    /*
  
  
  
    index.jsp
  

运行结构如下：

获取Android端传过来的普通信息：
用户名：张三
密码：zhangsan
年龄：21
文件名：123.rmvb
获取Android端传过来的文件信息：
文件存放目录: D:apache-tomcat-6.0.18webappsuploadimage
文件名称: 123.rmvb
文件大小: 3962649
文件类型: application/octet-stream
文件上传成功

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