Java WS和二进制数据传送

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(一) 有关介绍二进制数据在WS中传送,可以有两种方式:1 把数据直接作为xml文档中某元素的字节流,作为XML解析器要解析的一部分,很明显这种方式比较低效.2 二进制数据作为附件,作为带外(out of band)数据随同XML发送, 提高了效率.目前这类处理有几个规范:DIME(直接 Internet 消息封装),这个数据包装格式及其处理,只有微软在支持.WSattch.asp" />http://www.microsoft.com/china/msdn/archives/library/dnwebsrv/html/DIMEWSAttch.asphttp://www.zdnet.com.cn/developer/code/story/0,3800066897,39358789,00.htmMTOM(SOAP 消息传输优化机制)和XOP(二进制 XML 优化封装);在Sun规范JAX-RPC1.1中,要求使用SwA(SOAP with Attachments) 支持附件,为此Sun提供了SOAP with Attachments API for Java,带附件的SoapAPI(SAAJ),早期它和jaxm合在一起的,现在已经独立开来形成了soap包,这个API专门用来处理Soap附件的所有操作.JAXRPC 1.1 规范定义了MIME类型到Java类型的影射.mime type Java typeimage/gifJava.awt.imageimage/jpegJava.awt.imagetext/plainJava.lang.stringmultipart/*Javax.mail.internet.mimemultiparttext/xml or application/xmlJavax.xml.transform.sourceJAXRPC 1.1 规范定义了这种情况:当绑定到上表中没有定义的类型影射或者是绑定到备用MIME类型时,它应该影射到 Javax.activation.DataHandler.WScompile工具中的选项-f:用于类型影射的项:datahandleronly,该项指明总是把附件影射到DataHandler类型.(二) 编写例子应用文件清单SEI接口类IImage.Java,实现SEI接口的类IIMageImpl.Java,描述文件信息的值类型类FileInfo.Java,Web应用部署描述文件web.xml,WS发布配置文件jaxrpc-ri.xml,WS编译配置文件config-interface.xml,构建客户端桩的config-WSdl.xml,构建文件build.xml客户端测试类:MainBroWSer.Java,ImageListProvider.Java和ImageLabelProvider.Java,测试使用了SWT和JFace,请适当配置你的Eclipse环境,引入适当的库.这个例子是从SEI开始,绑定样式为 RPC.IImage.Java清单: package com.bin;import Java.rmi.Remote;import Java.rmi.RemoteException;import Javax.activation.*;import Javax.xml.soap.*;import Java.util.*;public interface IImage extends Remote {public DataHandler fetchImg(String sn) throWS RemoteException;public ArrayList fetchImgs(String[] sn) throWS RemoteException;public SOAPMessage construcMsg(String[] fn) throWS RemoteException;public ArrayList fetchFileList() throWS Java.rmi.RemoteException;public FileInfo getFileList(String fn) throWS Java.rmi.RemoteException;}实现类 ImageImpl.Java清单:package com.bin;import Javax.xml.soap.*;import Java.net.*;import Java.util.*;import Java.io.*;import Javax.activation.*;import Java.rmi.*;import Java.awt.*;import Javax.xml.rpc.ServiceException;import Javax.xml.rpc.server.*;import Javax.xml.rpc.handler.soap.SOAPMessageContext;import Javax.xml.rpc.handler.MessageContext;import Javax.servlet.ServletContext;import com.sun.xml.rpc.server.*;public class ImageImpl implements IImage, ServiceLifecycle {ServletEndpointContext servletEndpointContext = null;String binarypath = "";ArrayList al;ServletContext servletContext = null;public void init(Object p0) throWS ServiceException {// Some logic to do upon service creationservletEndpointContext = (ServletEndpointContext) p0;servletContext = servletEndpointContext.getServletContext();binarypath = servletContext.getInitParameter("BinaryPath");}public void destroy() {// Some logic to do on service destruction - e.g. clean up JDBCservletEndpointContext = null;servletContext = null;}public ArrayList fetchFileList() throWS RemoteException {File file = new File(this.binarypath);//System.out.println(this.binarypath);if (al == null)al = new ArrayList();File[] c = file.listFiles();for (int i = 0; i < c.length; i++) {FileInfo fi = new FileInfo();fi.setIsdir(c[i].isDirectory());fi.setFilename(c[i].getName());fi.setFilelength(c[i].length());fi.setFilepath(c[i].getAbsolutePath());fi.setCreatedate(new Date(c[i].lastModified()));al.add(fi);}return al;}public DataHandler fetchImg(String sn) throWS RemoteException {File file = new File(sn);DataHandler dataHandler = null;try {URL url = new URL(file.toURL().toString());dataHandler = new DataHandler(url);} catch (Exception ex) {System.out.println(ex);throw new RemoteException(ex.getMessage());}return dataHandler;}public ArrayList fetchImgs(String[] fn) throWS RemoteException {ArrayList al = new ArrayList();try {for (int i = 0; i < fn.length; i++) {File file = new File(fn[i]);// Create attachment part for imageURL url = new URL(file.toURL().toString());DataHandler dataHandler = new DataHandler(url);al.add(dataHandler);}} catch (Exception ex) {System.out.println(ex);throw new RemoteException(ex.getMessage());}return al;}public SOAPMessage construcMsg(String[] fn) throWS RemoteException {FileReader fr = null;BufferedReader br = null;String line = "";SOAPMessage message = null;try {// Create message factoryMessageFactory messageFactory = MessageFactory.newInstance();// Create a messagemessage = messageFactory.createMessage();// Get the SOAP header and body from the message// and remove the headerSOAPHeader header = message.getSOAPHeader();SOAPBody body = message.getSOAPBody();header.detachNode();for (int i = 0; i < fn.length; i++) {File file = new File(fn[i]);// Create attachment part for imageURL url = new URL(file.toURL().toString());DataHandler dataHandler = new DataHandler(url);AttachmentPart attachment2 = message.createAttachmentPart(dataHandler);attachment2.setContentId(file.getName());message.addAttachmentPart(attachment2);}} catch (IOException e) {System.out.println("I/O exception: " + e.toString());throw new RemoteException(e.getMessage());} catch (Exception ex) {ex.printStackTrace();throw new RemoteException(ex.getMessage());}return message;}public FileInfo getFileList(String fn) throWS RemoteException {// TODO Auto-generated method stubFile file = new File(fn);FileInfo fi = new FileInfo();fi.setFilename(file.getName());fi.setFilelength(file.length());fi.setFilepath(file.getAbsolutePath());fi.setCreatedate(new Date(file.lastModified()));return fi;}}FileInfo.Java清单:package com.bin;import Java.util.Date;/*** 这是一个值类型,既然是值类型,它满足:1 必须有缺省构造器. 2 必须没有实现Remote(直接的或是间接的). 3属性类型必须是JAX-RPC支持的类型.*/public class FileInfo {private String filename;private String filepath;private long filelength;private Date createdate;private boolean isdir = false;public FileInfo() {}public Date getCreatedate() {return createdate;}public void setCreatedate(Date createdate) {this.createdate = createdate;}public long getFilelength() {return filelength;}public void setFilelength(long filelength) {this.filelength = filelength;}public String getFilename() {return filename;}public void setFilename(String filename) {this.filename = filename;}public String getFilepath() {return filepath;}public void setFilepath(String filepath) {this.filepath = filepath;}public String toString() {return this.filename + this.getFilepath() + this.getFilelength();}public boolean isIsdir() {return isdir;}public void setIsdir(boolean isdir) {this.isdir = isdir;}}web.xml清单:http://Java.sun.com/xml/ns/j2ee"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="Java.sun.com/xml/ns/j2ee" />http://Java.sun.com/xml/ns/j2ee Java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" />http://Java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"version="2.4">BinaryPath更改成你的本地文件路径index.htmindex.jspindex.jWSconfig-interface.xml清单:http://Java.sun.com/xml/ns/jax-rpc/ri/config">config-WSdl.xml清单:http://Java.sun.com/xml/ns/jax-rpc/ri/config"><WSdl location="WSdl" />http://localhost:8080/skysoft/binary?WSDL"packageName="com.binary" />jaxrpc-ri.xml清单:http://Java.sun.com/xml/ns/jax-rpc/ri/dd"version="1.0"targetNamespaceBase="Java.sun.com/xml/ns/jax-rpc/WSi/WSdl" />http://Java.sun.com/xml/ns/jax-rpc/WSi/WSdl"typeNamespaceBase="Java.sun.com/xml/ns/jax-rpc/WSi/types" />http://Java.sun.com/xml/ns/jax-rpc/WSi/types"urlPatternBase="/WS">构建文件build.xml:依次运行build,create-war,deploy,genstaticstub等任务,这样本例中的WS所需要的文件全部生成.WSdp-1.5/jaxrpc/lib">WSdp-1.6/jaxrpc/lib">WSdp-1.6/saaj/lib">WSdp-1.6/jaxrpc/lib">WSdp-1.6/jWSdp-shared/lib">WSdp-1.6/jWSdp-shared/lib">WSdp-1.6/jaxrpc/lib">WSdp-1.6/saaj/lib">WScompile" classpathref="jaxrpc-classpath" classname="com.sun.xml.rpc.tools.ant.WScompile">WSdeploy" classpathref="jaxrpc-classpath" classname="com.sun.xml.rpc.tools.ant.WSdeploy">WS classes"><WScompile help="true">WScompile>WS classes"><WScompile import="false" define="true" gen="false" features="WSi,documentliteral" keep="true" base="${classes.dir}" sourceBase="${src.dir}" classpath="./classes" nonClassDir="${nonclass.dir}" model="model.xml.gz" xPrintStackTrace="true" config="config-interface.xml" verbose="true">WScompile>WS"><WSdeploy keep="false" verbose="true" tmpDir="${tmp.dir}" outWarFile="skysoft.war" inWarFile="hello_raw.war">WSdeploy>WSdl, **/*mapping.xml" />WSdl, **/*mapping.xml" /><WScompile client="true" keep="true" base="./staticstub" sourceBase="./staticstub" xPrintStackTrace="true" config="config-WSdl.xml" verbose="true">WScompile>接下来,发布skysoft.war到你的web服务环境,本例使用的是Tomcat5,检查WSdl" />http://localhost:8080/skysoft/binary?WSDL是否装入.发布成功后,用Eclipse新建一个Java项目,把静态桩文件悉数拷贝到该项目的src下,然后编写以下类:MainBroWSer窗口类,显示图文件.package swtui;import Java.io.IOException;import Java.rmi.RemoteException;import Java.util.ArrayList;import Javax.xml.rpc.Stub;import org.eclipse.jface.resource.ImageDescriptor;import org.eclipse.jface.viewers.ISelectionChangedListener;import org.eclipse.jface.viewers.IStructuredSelection;import org.eclipse.jface.viewers.SelectionChangedEvent;import org.eclipse.jface.viewers.TableViewer;import org.eclipse.jface.window.ApplicationWindow;import org.eclipse.swt.SWT;import org.eclipse.swt.custom.SashForm;import org.eclipse.swt.graphics.Image;import org.eclipse.swt.graphics.ImageData;import org.eclipse.swt.widgets.*;import com.binary.BinaryService_Impl;import com.binary.FileInfo;import com.binary.IImage;import com.binary.IImage_Stub;public class MainBroWSer extends ApplicationWindow {Label label;ImageLabelProvider canvas;Image image;public MainBroWSer(Shell arg0) {super(arg0);// TODO Auto-generated constructor stub}public MainBroWSer() {super(null);addStatusLine();// TODO Auto-generated constructor stub}/** * ImageLoader Currently supported image formats are: * * BMP (WindoWS Bitmap) ICO (WindoWS Icon) JPEG GIF PNG */protected Control createContents(Composite parent) {getShell().setText("JFace File Explorer");SashForm sash_form = new SashForm(parent, SWT.HORIZONTAL | SWT.NULL);TableViewer tbv = new TableViewer(sash_form, SWT.BORDER| SWT.FULL_SELECTION | SWT.MULTI);ImageListProvider img = new ImageListProvider();tbv.setContentProvider(img);tbv.setInput(getFileInfo());tbv.addSelectionChangedListener(new ISelectionChangedListener() {public void selectionChanged(SelectionChangedEvent event) {IStructuredSelection selection = (IStructuredSelection) event.getSelection();FileInfo fi = (FileInfo) selection.getFirstElement();if (!fi.isIsdir()) {showImage(fi.toString());canvas.adjustSize();// canvas.redraw();}setStatus(fi.toString());}});canvas = new ImageLabelProvider(sash_form, SWT.SHELL_TRIM| SWT.NO_BACKGROUND | SWT.NO_REDRAW_RESIZE | SWT.V_SCROLL| SWT.H_SCROLL | SWT.CENTER);return sash_form;}public static void main(String[] args) {MainBroWSer w = new MainBroWSer();w.setBlockOnOpen(true);w.open();}public void showImage(String fn) {IImage_Stub stub = (IImage_Stub) createProxy();IImage hello = (IImage) stub;ImageData idata = null;try {idata = new ImageData(hello.fetchImg(fn).getInputStream());} catch (RemoteException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}ImageDescriptor id = ImageDescriptor.createFromImageData(idata);if (image != null)image.dispose();image = id.createImage();// label.setImage(id.createImage());// canvas.setData(image);canvas.setImage(image);}public Object getFileInfo() {IImage_Stub stub = (IImage_Stub) createProxy();IImage hello = (IImage) stub;ArrayList al = null;try {al = hello.fetchFileList();} catch (RemoteException e) {// TODO Auto-generated catch blocke.printStackTrace();}return al;}private Stub createProxy() {return (Stub) (new BinaryService_Impl().getIImagePort());}}ImageLabelProvider标签类,能滚动图象的组件.package swtui;import org.eclipse.swt.graphics.GC;import org.eclipse.swt.graphics.Image;import org.eclipse.swt.graphics.Point;import org.eclipse.swt.graphics.Rectangle;import org.eclipse.swt.widgets.Canvas;import org.eclipse.swt.widgets.Composite;import org.eclipse.swt.widgets.Event;import org.eclipse.swt.widgets.Listener;import org.eclipse.swt.widgets.ScrollBar;import org.eclipse.swt.*;public class ImageLabelProvider extends Canvas {ScrollBar hBar = null;ScrollBar vBar = null;private Image image;public Image getImage() {return image;}public void setImage(Image image) {this.image = image;setData(image);}public ImageLabelProvider() {this(null, SWT.CENTER);// TODO Auto-generated constructor stub}public ImageLabelProvider(Composite arg0, int arg1) {super(arg0, arg1);hBar = getHorizontalBar();vBar = getVerticalBar();setListener();// TODO Auto-generated constructor stub}public void adjustSize() {if(image==null)return;final Point origin = new Point(0, 0);Rectangle rect = image.getBounds();Rectangle client = getClientArea();hBar.setMaximum(rect.width);vBar.setMaximum(rect.height);hBar.setThumb(Math.min(rect.width, client.width));vBar.setThumb(Math.min(rect.height, client.height));int hPage = rect.width - client.width;int vPage = rect.height - client.height;int hSelection = hBar.getSelection();int vSelection = vBar.getSelection();if (hSelection >= hPage) {if (hPage <= 0)hSelection = 0;origin.x = -hSelection;}if (vSelection >= vPage) {if (vPage <= 0)vSelection = 0;origin.y = -vSelection;}redraw();}private void setListener() {final Point origin = new Point(0, 0);hBar.addListener(SWT.Selection, new Listener() {public void handleEvent(Event e) {int hSelection = hBar.getSelection();int destX = -hSelection - origin.x;Rectangle rect = image.getBounds();scroll(destX, 0, 0, 0, rect.width, rect.height, false);origin.x = -hSelection;}});vBar.addListener(SWT.Selection, new Listener() {public void handleEvent(Event e) {int vSelection = vBar.getSelection();int destY = -vSelection - origin.y;Rectangle rect = getBounds();scroll(0, destY, 0, 0, rect.width, rect.height, false);origin.y = -vSelection;}});addListener(SWT.Resize, new Listener() {public void handleEvent(Event e) {Rectangle rect = image.getBounds();Rectangle client = getClientArea();hBar.setMaximum(rect.width);vBar.setMaximum(rect.height);hBar.setThumb(Math.min(rect.width, client.width));vBar.setThumb(Math.min(rect.height, client.height));int hPage = rect.width - client.width;int vPage = rect.height - client.height;int hSelection = hBar.getSelection();int vSelection = vBar.getSelection();if (hSelection >= hPage) {if (hPage <= 0)hSelection = 0;origin.x = -hSelection;}if (vSelection >= vPage) {if (vPage <= 0)vSelection = 0;origin.y = -vSelection;}redraw();}});addListener(SWT.Paint, new Listener() {public void handleEvent(Event e) {GC gc = e.gc;gc.drawImage(image, origin.x, origin.y);Rectangle rect = image.getBounds();Rectangle client = getClientArea();int marginWidth = client.width - rect.width;if (marginWidth > 0) {gc.fillRectangle(rect.width, 0, marginWidth, client.height);}int marginHeight = client.height - rect.height;if (marginHeight > 0) {gc.fillRectangle(0, rect.height, client.width,marginHeight);}}});}}ImageListProvider.Java代码清单:package swtui;import Java.io.File;import Java.rmi.RemoteException;import Java.util.ArrayList;import Javax.xml.rpc.Stub;import org.eclipse.jface.viewers.IStructuredContentProvider;import org.eclipse.jface.viewers.Viewer;import com.binary.*;public class ImageListProvider implements IStructuredContentProvider{public Object[] getElements1(Object element) {Object[] kids = ((ArrayList) element).toArray();return kids == null ? new Object[0] : kids;}private Stub createProxy() {return (Stub) (new BinaryService_Impl().getIImagePort());}public void dispose() {}public void inputChanged(Viewer arg0, Object arg1, Object arg2) {}}到此,例子结束,应该说使用Eclipse,借助于插件,开发一个web服务还是相当快捷的. 本例可通过扩展客户端以处理其它格式的文件.下一篇将介绍如何在C#中调用这个服务.