如何使用Web Service传输文件

2016-12-05 00:00:00嘉辉 J2EE培训

  server对外只开放80端口,并且还需要提供文件上传和下载功能的应用,下面yjbys小编为大家准备了关于如何使用Web Service传输文件的文章,欢迎阅读。

  1. 首先是一个封装了服务器端文件路径,客户端文件路径和要传输的字节数组的MyFile类。

  package com.googlecode.garbagecan.cxfstudy.filetransfer;

  public class MyFile {

  private String clientFile;

  private String serverFile;

  private long position;

  private byte[] bytes;

  public String getClientFile() {

  return clientFile;

  }

  public void setClientFile(String clientFile) {

  this.clientFile = clientFile;

  }

  public String getServerFile() {

  return serverFile;

  }

  public void setServerFile(String serverFile) {

  this.serverFile = serverFile;

  }

  public long getPosition() {

  return position;

  }

  public void setPosition(long position) {

  this.position = position;

  }

  public byte[] getBytes() {

  return bytes;

  }

  public void setBytes(byte[] bytes) {

  this.bytes = bytes;

  }

  }

  2. 文件传输的Web Service接口

  package com.googlecode.garbagecan.cxfstudy.filetransfer;

  import javax.jws.WebMethod;

  import javax.jws.WebService;

  @WebService

  public interface FileTransferService {

  @WebMethod

  void uploadFile(MyFile myFile) throws FileTransferException;

  @WebMethod

  MyFile downloadFile(MyFile myFile) throws FileTransferException;

  }

  3. 文件传输的Web Service接口实现类,主要是一些流的操作

  package com.googlecode.garbagecan.cxfstudy.filetransfer;

  import java.io.File;

  import java.io.FileInputStream;

  import java.io.IOException;

  import java.io.InputStream;

  import java.io.OutputStream;

  import java.util.Arrays;

  import org.apache.commons.io.FileUtils;

  import org.apache.commons.io.IOUtils;

  public class FileTransferServiceImpl implements FileTransferService {

  public void uploadFile(MyFile myFile) throws FileTransferException {

  OutputStream os = null;

  try {

  if (myFile.getPosition() != 0) {

  os = FileUtils.openOutputStream(new File(myFile.getServerFile()), true);

  } else {

  os = FileUtils.openOutputStream(new File(myFile.getServerFile()), false);

  }

  os.write(myFile.getBytes());

  } catch(IOException e) {

  throw new FileTransferException(e.getMessage(), e);

  } finally {

  IOUtils.closeQuietly(os);

  }

  }

  public MyFile downloadFile(MyFile myFile) throws FileTransferException {

  InputStream is = null;

  try {

  is = new FileInputStream(myFile.getServerFile());

  is.skip(myFile.getPosition());

  byte[] bytes = new byte[1024 * 1024];

  int size = is.read(bytes);

  if (size > 0) {

  byte[] fixedBytes = Arrays.copyOfRange(bytes, 0, size);

  myFile.setBytes(fixedBytes);

  } else {

  myFile.setBytes(new byte[0]);

  }

  } catch(IOException e) {

  throw new FileTransferException(e.getMessage(), e);

  } finally {

  IOUtils.closeQuietly(is);

  }

  return myFile;

  }

  }

  4. 一个简单的文件传输异常类

  package com.googlecode.garbagecan.cxfstudy.filetransfer;

  public class FileTransferException extends Exception {

  private static final long serialVersionUID = 1L;

  public FileTransferException() {

  super();

  }

  public FileTransferException(String message, Throwable cause) {

  super(message, cause);

  }

  public FileTransferException(String message) {

  super(message);

  }

  public FileTransferException(Throwable cause) {

  super(cause);

  }

  }

  5. 下面是Server类用来发布web service

  package com.googlecode.garbagecan.cxfstudy.filetransfer;

  import javax.xml.ws.Endpoint;

  public class FileTransferServer {

  public static void main(String[] args) throws Exception {

  Endpoint.publish("http://localhost:9000/ws/jaxws/fileTransferService", new FileTransferServiceImpl());

  }

  }

  6. 最后是Client类,用来发送文件上传和下载请求。

  package com.googlecode.garbagecan.cxfstudy.filetransfer;

  import java.io.File;

  import java.io.FileInputStream;

  import java.io.IOException;

  import java.io.InputStream;

  import java.io.OutputStream;

  import java.util.Arrays;

  import org.apache.commons.io.FileUtils;

  import org.apache.commons.io.IOUtils;

  import org.apache.cxf.jaxws.JaxWsProxyFactoryBean;

  public class FileTransferClient {

  private static final String address = "http://localhost:9000/ws/jaxws/fileTransferService";

  private static final String clientFile = "/home/fkong/temp/client/test.zip";

  private static final String serverFile = "/home/fkong/temp/server/test.zip";

  public static void main(String[] args) throws Exception {

  long start = System.currentTimeMillis();

  // uploadFile();

  // downloadFile();

  long stop = System.currentTimeMillis();

  System.out.println("Time: " + (stop - start));

  }

  private static void uploadFile() throws FileTransferException {

  InputStream is = null;

  try {

  MyFile myFile = new MyFile();

  is = new FileInputStream(clientFile);

  byte[] bytes = new byte[1024 * 1024];

  while (true) {

  int size = is.read(bytes);

  if (size <= 0) {

  break;

  }

  byte[] fixedBytes = Arrays.copyOfRange(bytes, 0, size);

  myFile.setClientFile(clientFile);

  myFile.setServerFile(serverFile);

  myFile.setBytes(fixedBytes);

  uploadFile(myFile);

  myFile.setPosition(myFile.getPosition() + fixedBytes.length);

  }

  } catch(IOException e) {

  throw new FileTransferException(e.getMessage(), e);

  } finally {

  IOUtils.closeQuietly(is);

  }

  }

  private static void uploadFile(MyFile myFile) throws FileTransferException {

  JaxWsProxyFactoryBean factoryBean = new JaxWsProxyFactoryBean();

  factoryBean.setAddress(address);

  factoryBean.setServiceClass(FileTransferService.class);

  Object obj = factoryBean.create();

  FileTransferService service = (FileTransferService) obj;

  service.uploadFile(myFile);

  }

  private static void downloadFile() throws FileTransferException {

  MyFile myFile = new MyFile();

  myFile.setServerFile(serverFile);

  long position = 0;

  while (true) {

  myFile.setPosition(position);

  myFile = downloadFile(myFile);

  if (myFile.getBytes().length <= 0) {

  break;

  }

  OutputStream os = null;

  try {

  if (position != 0) {

  os = FileUtils.openOutputStream(new File(clientFile), true);

  } else {

  os = FileUtils.openOutputStream(new File(clientFile), false);

  }

  os.write(myFile.getBytes());

  } catch(IOException e) {

  throw new FileTransferException(e.getMessage(), e);

  } finally {

  IOUtils.closeQuietly(os);

  }

  position += myFile.getBytes().length;

  }

  }

  private static MyFile downloadFile(MyFile myFile) throws FileTransferException {

  JaxWsProxyFactoryBean factoryBean = new JaxWsProxyFactoryBean();

  factoryBean.setAddress(address);

  factoryBean.setServiceClass(FileTransferService.class);

  Object obj = factoryBean.create();

  FileTransferService service = (FileTransferService) obj;

  return service.downloadFile(myFile);

  }

  }

  首先需要准备一个大一点的文件,然后修改代码中的clientFile和serverFile路径,然后分别打开uploadFile和downloadFile注释,运行程序,检查目标文件查看结果。

  这个程序还是比较简单的,但基本生完成了文件上传下载功能,如果需要,也可以对这个程序再做点修改使其支持断点续传。

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