在Android中通过XFire WebService远程上传以及下载图片
有时我们可以看到，图片往往被提交到服务器端，这里我通过XFire框架来实现远程上传以及下载图片的功能。
首先我们来看看从服务器端下载图片的功能：
我用的是KSOAP框架，我之前的文章有讲述过。在这里不要多说，贴上代码。
首先我们看看Acitivity中的代码：
package com.net.connect.app;
import java.io.File;
import java.io.FileInputStream;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import com.base.encry.decry.app.Base64;
import com.base.file.util.FileOperate;
import com.cn.blogs.ksoap.app.MyWebServiceHelper;
public class UpAndDownPicFileActivity extends Activity {
ImageView imageView;
public static final String filename = "xfire.png";
public static final String fileDir = "/sdcard/xmlfile/";
public MyWebServiceHelper myWebServiceHelper = new MyWebServiceHelper();
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.upanddownpic);
imageView = (ImageView) this.findViewById(R.id.imageView1);
// Bitmap
// bitmap=BitmapFactory.decodeFile("/sdcard/xmlfile/"+"xfire.png");
// imageView.setImageBitmap(bitmap);
Button downButton = (Button) findViewById(R.id.downbutton);
downButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
myWebServiceHelper.getTranferFileString(filename);
// 收到服务器端发送过来的图片，然后显现在图片框中
Bitmap bitmap = BitmapFactory.decodeFile(fileDir + filename);
imageView.setImageBitmap(bitmap);
}
});
Button upButton = (Button) findViewById(R.id.upbutton);
upButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
String fileContent = "";
FileOperate.OpenOrCreateFile(filename);
fileContent = FileOperate.bin2XmlString(fileDir+filename);
// Toast.makeText(UpAndDownPicFileActivity.this, fileContent, Toast.LENGTH_LONG).show();
String result=myWebServiceHelper.upToServerOfFileStringWithEncode(filename,
fileContent);
try {
Thread.currentThread().sleep(2000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
Toast.makeText(UpAndDownPicFileActivity.this, result, Toast.LENGTH_LONG).show();
// 收到服务器端发送过来的图片，然后显现在图片框中
//imageView.setImageBitmap(null);
}
});
}
}分别实现了远程上传和下载图片的功能。它的处理类集中在MyWebServiceHelper，它实现了远程获取和上传的细节功能。
这个功能都是通过KSOAP框架实现的。下面贴上它的代码，如下所示：
// WSDL文档中的命名空间
private static final String targetNameSpace = "http://android.googlepages.com/";
// WSDL文档中的URL
private static final String WSDL = "http://10.10.178.71:8888/WSDLApp/services/MyService";
// 需要调用的方法名(获得Myervices中的helloWorld方法)
private static final String getHelloworld = "helloWorld";
//需要调用的方法名(获得Myervices中的login方法)
private static final String getLogin="login";
//获取加密图片的字符串
private static final String getTranferFileStringWithEncode="tranferFileStringWithEncode";
//获取加密图片的字符串
private static final String upToServerOfFileContent="fetchFileStringWithEncode";
public String getTranferFileString(String filename) {
String fileContent = "";
SoapObject soapObject = new SoapObject(targetNameSpace,getTranferFileStringWithEncode);
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
envelope.dotNet = false;
envelope.setOutputSoapObject(soapObject);
HttpTransportSE httpTranstation=new HttpTransportSE(WSDL);
try {
httpTranstation.call(targetNameSpace + getTranferFileStringWithEncode, envelope);
SoapObject result = (SoapObject ) envelope.bodyIn;//getResponse();
fileContent=(String) result.getProperty(0).toString();
//String strFile="downfromserive"+Math.random()+".png";
FileOperate.OpenOrCreateFile(filename);
FileOperate.xmlString2Bin(fileContent, new File(filename));
// 也可以通过下面方式获得str
// SoapPrimitive result = (SoapPrimitive ) envelope.getResponse();
// str=result.toString();
// 直指value字符串值
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (XmlPullParserException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return fileContent;
}
public String upToServerOfFileStringWithEncode(String filename,String fileContent) {
String str = "";
SoapObject soapObject = new SoapObject(targetNameSpace,upToServerOfFileContent);
soapObject.addProperty("filename", filename);
soapObject.addProperty("fileContent", fileContent);
SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(SoapEnvelope.VER11);
envelope.dotNet = false;
envelope.setOutputSoapObject(soapObject);
HttpTransportSE httpTranstation=new HttpTransportSE(WSDL);
try {
httpTranstation.call(targetNameSpace + upToServerOfFileContent, envelope);
SoapObject result = (SoapObject ) envelope.bodyIn;//getResponse();
str=(String) result.getProperty(0).toString();
//返回上传成功0,1标志位
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return e.getMessage();
} catch (XmlPullParserException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return e.getMessage();
}
return str;
}在第二个函数中有：
SoapObject soapObject = new SoapObject(targetNameSpace,upToServerOfFileContent);
soapObject.addProperty("filename", filename);
soapObject.addProperty("fileContent", fileContent);这个是android客户端传送服务器端的参数参数。
而里面有个FileOperate.java类，这个类负责对文件操作。我封装在这个类中，方便集中处理以及调用。
下面贴上代码。如下所示：
package com.base.file.util;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import com.base.encry.decry.app.Base64;
public class FileOperate {
//在SD卡中创建文件
public static void OpenOrCreateFile(String filename){
// 获取扩展SD卡设备状态
String sDStateString = android.os.Environment
.getExternalStorageState();
if (sDStateString.equals(android.os.Environment.MEDIA_MOUNTED)) {
// String strFile="downfromserive"+Math.random()+".png";
// 获取扩展存储设备的文件目录
File SDFile = android.os.Environment
.getExternalStorageDirectory();
File destDir = new File("/sdcard/xmlfile");
// File destDir = new File(SDFile.getAbsolutePath() +
// destDirStr);
if (!destDir.exists())
destDir.mkdir();
// Toast.makeText(SDCardTest., text, duration)
// 打开文件
File myFile = new File(destDir + File.separator + filename);
// 判断是否存在,不存在则创建
if (!myFile.exists()) {
try {
myFile.createNewFile();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
//删除指定文件，比如临时文件
public static void removeFile(String filename){
if(new File(filename).exists())
new File(filename).delete();
}
//解密，并将内容写入至指定文件中
public static boolean xmlString2Bin(String base64String, File file) {
byte[] data;
FileOutputStream output = null;
boolean ret = false;
try {
data = Base64.decode(base64String);
output = new FileOutputStream(file);
output.write(data);
output.close();
ret = true;
} catch (Exception e) {
e.printStackTrace();
}
return ret;
}
//将文件内容加密
public static String bin2XmlString(String filename) {
byte[] data = null;
FileInputStream input = null;
String ret = null;
int n;
try {
data = new byte[(int) new File(filename).length()];
input = new FileInputStream(new File(filename));
n = input.read(data);//这个就是一个文件读取过程。没有写while，一次性读完
input.close();
ret = new String(Base64.encode(data));
} catch (Exception e) {
e.printStackTrace();
}
return ret;
}
}当然，我们还在看看这个Activity.java中的布局文件。
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /> <Button android:id="@+id/downbutton" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="下载" /> <Button android:id="@+id/upbutton" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="上传" /> <ImageView android:id="@+id/imageView1" android:layout_width="fill_parent" android:layout_height="wrap_content" /> </LinearLayout>
而服务器端用的是XFire框架，这在之前的文章中讲过。不必多说。
看下面的代码：
在AccountImp.java中实现IAccount.java方法。
public String tranferFileStringWithEncode() {
// TODO Auto-generated method stub
return FileOperate.bin2XmlString("E://Workspaces//workspace//WSDLApp//"+"girl.png");
}
public String fetchFileStringWithEncode(String filename, String fileContent) {
// TODO Auto-generated method stub
//创建该新文件，并返回成功
try {
//打开并创建文件
FileOperate.OpenOrCreateFile(filename);
String pathFile="E://Workspaces//workspace//WSDLApp";
//解密，并将内容添加至该文件中
FileOperate.xmlString2Bin(fileContent, new File("E://Workspaces//workspace//WSDLApp//xfire.png"));
return "上传成功";
} catch (Exception e) {
// TODO: handle exception
return "上传失败";
}
}IAccount.java
//将 POJO 发布成 Web 服务:有两种方法，接口和实现类是其中之一
public interface IAccount {
public int account(int x,int y);
public String helloWorld(String str);
//访问mysql数据库
public int login(String username,String password);
//传送图片字符串
public String tranferFileStringWithEncode();
//接收远程传送过来的图片字符串
public String fetchFileStringWithEncode(String username,String filename);
}而这个XFIRE要在web.xml中注册.
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.4" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
<servlet>
<servlet-name>XFireServlet</servlet-name>
<servlet-class>org.codehaus.xfire.transport.http.XFireConfigurableServlet</servlet-class>
<load-on-startup>0</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>XFireServlet</servlet-name>
<url-pattern>/services/*</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>这样Web服务就用去查找services目录下。所以还要在WebServices目录下（在该服务器端要目录下）创建
services.xml文件。如下所示：
<!-- 服务一:简单计算，直接输出 --> <service> <name>MyService</name> <serviceClass>test.IAccount</serviceClass> <implementationClass>test.AccountImp</implementationClass> <mce:style><!-- wrapped --></mce:style><style mce_bogus="1">wrapped</style> <use>literal</use> <scope>application</scope> <namespace>http://android.googlepages.com/</namespace> </service>
最终实现效果如下所示：
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