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通过Web服务从服务器向客户端发送PDF文件

javaandroidweb-servicesjakarta-ee
9

作为一个新手，我想请问一个问题。

我想实现一个Web服务，客户端调用此Web服务时可以发送PDF文件给客户端。

请有经验的人提供一些代码或解释。

现在，请有经验的人帮我解决错误。

12-23 09:42:48.429: DEBUG/installd(32): DexInv: --- BEGIN '/data/app/vmdl33143.tmp' --- 12-23 09:42:51.708: DEBUG/dalvikvm(328): DexOpt: 'Lorg/xmlpull/v1/XmlPullParser;'有早期定义；阻塞 12-23 09:42:51.730: DEBUG/dalvikvm(328): DexOpt: 'Lorg/kxml2/io/KXmlParser;'有早期定义；阻塞 12-23 09:42:51.749: DEBUG/dalvikvm(328): DexOpt: 'Lorg/xmlpull/v1/XmlSerializer;'有早期定义；阻塞 12-23 09:42:51.759: DEBUG/dalvikvm(328): DexOpt: 'Lorg/kxml2/io/KXmlSerializer;'有早期定义；阻塞 12-23 09:42:51.779: DEBUG/dalvikvm(328): DexOpt: 'Lorg/kxml2/kdom/Node;'有早期定义；阻塞 12-23 09:42:51.779: DEBUG/dalvikvm(328): DexOpt: 'Lorg/kxml2/kdom/Document;'有早期定义；阻塞 12-23 09:42:51.819: DEBUG/dalvikvm(328): DexOpt: 'Lorg/kxml2/kdom/Element;'有早期定义；阻塞 12-23 09:42:51.830: DEBUG/dalvikvm(328): DexOpt: 'Lorg/kxml2/wap/Wbxml;'有早期定义；阻塞 12-23 09:42:51.840: DEBUG/dalvikvm(328): DexOpt: 'Lorg/kxml2/wap/WbxmlParser;'有早期定义；阻塞 12-23 09:42:51.900: DEBUG/dalvikvm(328): DexOpt: 'Lorg/kxml2/wap/WbxmlSerializer;'有早期定义；阻塞 12-23 09:42:51.910: DEBUG/dalvikvm(328): DexOpt: 'Lorg/kxml2/wap/syncml/SyncML;'有早期定义；阻塞 12-23 09:42:51.910: DEBUG/dalvikvm(328): DexOpt: 'Lorg/kxml2/wap/wml/Wml;'有早期定义；阻塞 12-23 09:42:51.929: DEBUG/dalvikvm(328): DexOpt: 'Lorg/kxml2/wap/wv/WV;'有早期定义；阻塞 12-23 09:42:51.929: DEBUG/dalvikvm(328): DexOpt: 'Lorg/xmlpull/v1/XmlPullParserException;'有早期定义；阻塞 12-23 09:42:51.949: DEBUG/dalvikvm(328): DexOpt: 'Lorg/xmlpull/v1/XmlPullParserFactory;'有早期定义；阻塞 12-23 09:42:53.299: INFO/dalvikvm(328): DexOpt: 不解决模糊类'Lorg/xmlpull/v1/XmlPullParser;' 12-23 09:42:53.319: INFO/dalvikvm(328): DexOpt: 不解决模糊类'Lorg/xmlpull/v1/XmlPullParser;' 12-23 09:42:53.329: INFO/dalvikvm(328): DexOpt: 不解决模糊类'Lorg/xmlpull/v1/XmlPullParser;' 12-23 09:42:53.350: INFO/dalvikvm(328): DexOpt: 不解决模糊类'Lorg/xmlpull/v1/XmlPullParser;' 12-23 09:42:53.350: INFO/dalvikvm(328): DexOpt: 不解决模糊类'Lorg/xmlpull/v1/XmlPullParser;' 12-23 09:42:53.370: INFO/dalvikvm(328): DexOpt: 不解决模糊类'Lorg/xmlpull/v1/XmlPullParser;' 12-23 09:42:53.499: INFO/dalvikvm(328): DexOpt:
这是Android模拟器DDMS中的错误。
现在我的网络服务和代码看起来像这样。
代码：-
package com.uks.webservice;

import java.io.FileNotFoundException;  
import java.io.IOException;  
import java.rmi.Remote;  

public interface SendPDF extends Remote {

    public String[] sendPDF() throws FileNotFoundException, IOException,
            Exception;
}

创建了 Web 服务的主类：

package com.uks.webservice;

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

import javax.activation.DataHandler;  
import javax.activation.FileDataSource;  

import sun.misc.BASE64Encoder;  

public class SendPDFImpl implements SendPDF {

@Override
public String[] sendPDF() {

    String[] pdfFile = new String[2];
    BASE64Encoder encoder = new BASE64Encoder();
    File file = new File(
            "C:/eclipse/workspace/AIPWebService/src/test.pdf");
    DataHandler dh = new DataHandler(new FileDataSource(file));
    String readLine = null;
    byte[] data = new byte[(int) file.length()];
    int offset = 0;
    int numRead = 0;
    InputStream stream = null;
    try {
        System.out.println("Web Service Called Successfully");
        stream = dh.getInputStream();
        // BufferedReader bufferedReader = new BufferedReader(
        // new InputStreamReader(stream));
        while (offset < data.length
                && (numRead = stream.read(data, offset, data.length
                        - offset)) >= 0) {
            offset += numRead;
        }
        readLine = encoder.encode(data);
        // while ((readLine = bufferedReader.readLine()) != null) {
        System.out.println("'Reading File............................");
        System.out.println("\n");
        System.out.println("Data Reading Successful");

        pdfFile[0] = file.getName();
        pdfFile[1] = readLine;

        stream.close();

    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return pdfFile;
}
}

Web服务：

<?xml version="1.0" encoding="UTF-8"?>
<wsdl:definitions targetNamespace="http://webservice.uks.com"
    xmlns:apachesoap="http://xml.apache.org/xml-soap" xmlns:impl="http://webservice.uks.com"
    xmlns:intf="http://webservice.uks.com" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"
    xmlns:wsdlsoap="http://schemas.xmlsoap.org/wsdl/soap/" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <!--
        WSDL created by Apache Axis version: 1.4 Built on Apr 22, 2006
        (06:55:48 PDT)
    -->
    <wsdl:types>
        <schema elementFormDefault="qualified" targetNamespace="http://webservice.uks.com"
            xmlns="http://www.w3.org/2001/XMLSchema">
            <element name="sendPDF">
                <complexType />
            </element>
            <element name="sendPDFResponse">
                <complexType>
                    <sequence>
                        <element maxOccurs="unbounded" name="sendPDFReturn" type="xsd:String" />
                    </sequence>
                </complexType>
            </element>
        </schema>
    </wsdl:types>

    <wsdl:message name="sendPDFRequest">

        <wsdl:part element="impl:sendPDF" name="parameters" />

    </wsdl:message>

    <wsdl:message name="sendPDFResponse">

        <wsdl:part element="impl:sendPDFResponse" name="parameters" />

    </wsdl:message>

    <wsdl:portType name="SendPDFImpl">

        <wsdl:operation name="sendPDF">

            <wsdl:input message="impl:sendPDFRequest" name="sendPDFRequest" />

            <wsdl:output message="impl:sendPDFResponse" name="sendPDFResponse" />

        </wsdl:operation>

    </wsdl:portType>

    <wsdl:binding name="SendPDFImplSoapBinding" type="impl:SendPDFImpl">

        <wsdlsoap:binding style="document"
            transport="http://schemas.xmlsoap.org/soap/http" />

        <wsdl:operation name="sendPDF">

            <wsdlsoap:operation soapAction="" />

            <wsdl:input name="sendPDFRequest">

                <wsdlsoap:body use="literal" />

            </wsdl:input>

            <wsdl:output name="sendPDFResponse">

                <wsdlsoap:body use="literal" />

            </wsdl:output>

        </wsdl:operation>

    </wsdl:binding>

    <wsdl:service name="SendPDFImplService">

        <wsdl:port binding="impl:SendPDFImplSoapBinding" name="SendPDFImpl">

            <wsdlsoap:address
                location="http://localhost:8080/AIPWebService/services/SendPDFImpl" />

        </wsdl:port>

    </wsdl:service>

</wsdl:definitions>

现在是我的Android代码。

package com.uks.android.webservice;

import android.app.Activity;  
import android.os.Bundle;  
import android.widget.TextView;  

import org.ksoap2.SoapEnvelope;  
import org.ksoap2.serialization.SoapObject;  
import org.ksoap2.serialization.SoapSerializationEnvelope;  
import org.ksoap2.transport.AndroidHttpTransport;  

public class PDFActivity extends Activity {  
    private final String METHOD_NAME = "sendPDF";  
    private final String NAMESPACE = "http://webservice.uks.com/";  
    private final String SOAP_ACTION = NAMESPACE + METHOD_NAME;  
    private final String URL = "http://192.168.1.123:8080/AIPWebService/services/SendPDFImpl";  

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        TextView textViewOne = (TextView) findViewById(R.id.textViewOne);
        TextView textViewTwo = (TextView) findViewById(R.id.textViewTwo);
        try {
            SoapObject soapObject = new SoapObject(NAMESPACE, METHOD_NAME);

            SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(
                    SoapEnvelope.VER11);
            envelope.setOutputSoapObject(soapObject);

            textViewOne.setText("Web Service Started");
            AndroidHttpTransport httpTransport = new AndroidHttpTransport(URL);

            httpTransport.call(SOAP_ACTION, envelope);

            SoapObject result = (SoapObject) envelope.getResponse();
            textViewTwo.setText(result.toString());
            // Object result = envelope.getResponse();
            // FileOutputStream outputStream = openFileOutput(name, mode)

        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

请帮助我。

提前致谢。

2个回答
4
你需要将文件转换为字节数组并传递给服务器上的服务，然后反转以获取文件。请使用JAXWS来完成此操作，请参考这篇非常好的文章。
请告诉我如何在 Apache Axis 中使用它。 - Shashank_Itmaster
抱歉耽搁了，我正在忙于编写这个网络服务。感谢您的回答。 - Shashank_Itmaster
Shashank，你好吗？ - Mehul Mistri
1
http://geemonkb.blogspot.com/2009/01/jax-wx-streaming-soap-attachments.html现在已经无法访问。我找到了另一篇文章：http://middlewaremagic.com/weblogic/?p=6888 - Evi Song
2
这是更好、更正式的内容：https://blogs.oracle.com/milan/entry/jax_ws_tutorial_working_with - Evi Song
显示剩余2条评论
0
你可以使用 Java EE 6 技术，它非常适合你的需求。只需要创建一个 Web-service，在 GET 请求中返回字节数组即可。
请参阅 this 手册。
抱歉，我有点困惑于使用哪个Web服务API。因为我正在使用具有Apache Axis内置支持的Eclipse。你能告诉我更多关于它的信息吗？或者请让我了解Web服务技术中使用的不同API。 - Shashank_Itmaster
这里并不那么重要IDE，更重要的是你的服务器，它真正支持JEE 6吗？ - Vladimir Ivanov
我确切地不知道，但可以肯定地说是的，因为我正在使用Apache Tomcat 6.0.20。 - Shashank_Itmaster
@VladimirIvanov 给出的链接无效。 - Kasun Siyambalapitiya
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