Silverlight技术调查(4)——完成的调查结果

客户端使用Silverlight+DXperience，可以在线编辑各种常见文本及富文本文档（doc、docx、rtf、txt、html……），Silverlight使用了异步提交和响应（通过WebClient和WebRequest），提交时，自行编排HTTP请求格式（请参见相应RFC标准）；编辑的数据流上传至Servlet后，Servlet使用commons-fileupload-1.2.2解包数据，获取附加的请求参数及附件内容。

程序效果：

下面为客户端和服务器端程序：

（一）客户端Silverlight由部分组成：

1、主程序画面Layout部分MainPage.xaml：

<UserControl x:Class="RichEdit.MainPage"    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"    mc:Ignorable="d"    d:DesignHeight="300" d:DesignWidth="400" xmlns:dxre="http://schemas.devexpress.com/winfx/2008/xaml/richedit" xmlns:dxb="http://schemas.devexpress.com/winfx/2008/xaml/bars" xmlns:dx="http://schemas.devexpress.com/winfx/2008/xaml/core" xmlns:dxr="http://schemas.devexpress.com/winfx/2008/xaml/ribbon">    <UserControl.Resources>        <ResourceDictionary>            <dxre:RichEditUICommand x:Key="commands" />            <dxre:RichEditStringIdConverter x:Key="stringIdConverter" />        </ResourceDictionary>    </UserControl.Resources>    <Grid x:Name="LayoutRoot" Background="White">        <dxb:BarManager Name="barManager1" ToolbarGlyphSize="Small">            <dxb:BarManager.Items>                <dxb:BarButtonItem Command="{Binding Path=FileNew, Mode=OneTime, Source={StaticResource commands}}" Name="biFileNew" />                <dxb:BarButtonItem Command="{Binding Path=FileSaveAs, Mode=OneTime, Source={StaticResource commands}}" Name="biFileSaveAs" />                <dxb:BarButtonItem Command="{Binding Path=FilePrint, Mode=OneTime, Source={StaticResource commands}}" Name="biFilePrint" />                <dxb:BarButtonItem Command="{Binding Path=FilePrintPreview, Mode=OneTime, Source={StaticResource commands}}" Name="biFilePrintPreview" />                <dxb:BarButtonItem Command="{Binding Path=FileBrowserPrint, Mode=OneTime, Source={StaticResource commands}}" Name="biFileBrowserPrint" />                <dxb:BarButtonItem Command="{Binding Path=FileBrowserPrintPreview, Mode=OneTime, Source={StaticResource commands}}" Name="biFileBrowserPrintPreview" />                <dxb:BarButtonItem Command="{Binding Path=EditUndo, Mode=OneTime, Source={StaticResource commands}}" Name="biEditUndo" />                <dxb:BarButtonItem Command="{Binding Path=EditRedo, Mode=OneTime, Source={StaticResource commands}}" Name="biEditRedo" />                <dxb:BarButtonItem Content="LoadFromWeb" Name="barButtonItemLoad" Glyph="/RichEdit;component/Images/Chrysanthemum.jpg" ItemClick="barButtonItemLoad_ItemClick" GlyphAlignment="Top" GlyphSize="Default" />                <dxb:BarButtonItem Name="barButtonItemSave" Glyph="/RichEdit;component/Images/Desert.jpg" Content="SaveToWeb" ItemClick="barButtonItemSave_ItemClick" />                <dxb:BarStaticItem Content="message..." Name="barStaticItemMsg" />            </dxb:BarManager.Items>            <dx:DockPanel>                <dxr:RibbonControl dx:DockPanel.Dock="Top" Name="ribbonControl1">                    <dxr:RibbonControl.ApplicationMenu>                        <dxr:ApplicationMenuInfo />                    </dxr:RibbonControl.ApplicationMenu>                    <dxr:RibbonDefaultPageCategory>                        <dxr:RibbonPage Caption="{Binding Source={StaticResource stringIdConverter}, ConverterParameter=Caption_PageFile, Converter={StaticResource stringIdConverter}, Mode=OneTime}" Name="pageFile">                            <dxr:RibbonPageGroup Caption="{Binding Source={StaticResource stringIdConverter}, ConverterParameter=Caption_GroupCommon, Converter={StaticResource stringIdConverter}, Mode=OneTime}" Name="grpCommon" ShowCaptionButton="False">                                <dxb:BarButtonItemLink BarItemName="biFileNew" />                                <dxb:BarButtonItemLink BarItemName="biFileSaveAs" />                                <dxb:BarButtonItemLink BarItemName="biFilePrint" />                                <dxb:BarButtonItemLink BarItemName="biFilePrintPreview" />                                <dxb:BarButtonItemLink BarItemName="biFileBrowserPrint" />                                <dxb:BarButtonItemLink BarItemName="biFileBrowserPrintPreview" />                                <dxb:BarButtonItemLink BarItemName="biEditUndo" />                                <dxb:BarButtonItemLink BarItemName="biEditRedo" />                            </dxr:RibbonPageGroup>                            <dxr:RibbonPageGroup Caption="Ribbon Page Group 1" Name="ribbonPageGroup1">                                <dxb:BarButtonItemLink BarItemName="barButtonItemLoad" />                                <dxb:BarButtonItemLink BarItemName="barButtonItemSave" />                            </dxr:RibbonPageGroup>                            <dxr:RibbonPageGroup Caption="Ribbon Page Group 2" Name="ribbonPageGroup2">                                <dxb:BarStaticItemLink BarItemName="barStaticItemMsg" />                            </dxr:RibbonPageGroup>                        </dxr:RibbonPage>                    </dxr:RibbonDefaultPageCategory>                </dxr:RibbonControl>                <dxre:RichEditControl Name="richEditControl1" BarManager="{Binding ElementName=barManager1, Mode=OneTime}" Ribbon="{Binding ElementName=ribbonControl1, Mode=OneTime}" />            </dx:DockPanel>        </dxb:BarManager>    </Grid></UserControl>

2、主程序逻辑部分MainPage.xaml.cs：

using System;using System.Collections.Generic;using System.Linq;using System.Net;using System.Windows;using System.Windows.Controls;using System.Windows.Documents;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Animation;using System.Windows.Shapes;using System.IO;using DevExpress.XtraRichEdit;using System.Threading;namespace RichEdit{    public partial class MainPage : UserControl    {        public MainPage()        {            InitializeComponent();        }        String uri = "http://localhost:8888/upload/UploadServlet";        private void barButtonItemLoad_ItemClick(object sender, DevExpress.Xpf.Bars.ItemClickEventArgs e)        {            MessageBox.Show("Load Begin");            ServerStreamLoad ssl = new ServerStreamLoad();            ssl.Rp = new ShowLoadResultDelegate(ShowLoadResult);            ssl.Load(uri);        }        private void barButtonItemSave_ItemClick(object sender, DevExpress.Xpf.Bars.ItemClickEventArgs e)        {            MessageBox.Show("Save Begin");            WebRequest request = WebRequest.Create(new Uri(uri));            Dictionary<String, String> nvc = new Dictionary<String, String>();            nvc.Add("name", "value");            nvc.Add("name1", "value1");            ServerStreamSave sss = new ServerStreamSave();            sss.Rp = new ShowSaveResultDelegate(ShowSaveResult);            Stream stream = new MemoryStream();            this.richEditControl1.SaveDocument(stream, DocumentFormat.Rtf);            sss.Save(request, nvc, stream);        }        // 处理Load结果        public void ShowLoadResult(Stream stream)        {            String msg = "OK";            if (this.barStaticItemMsg.CheckAccess())            {                this.barStaticItemMsg.Content = msg;            }            else            {                Dispatcher.BeginInvoke(() =>                {                    this.barStaticItemMsg.Content = msg;                });            }            using (stream)            {                if (this.richEditControl1.CheckAccess())                {                    this.richEditControl1.LoadDocument(stream, DocumentFormat.Rtf);                }                else                {                    Dispatcher.BeginInvoke(() =>                    {                        this.richEditControl1.LoadDocument(stream, DocumentFormat.Rtf);                    });                }            }        }        // 处理Save结果        public void ShowSaveResult(String msg)        {            if (this.barStaticItemMsg.CheckAccess())            {                this.barStaticItemMsg.Content = msg;            }            else            {                Dispatcher.BeginInvoke(() =>                {                    this.barStaticItemMsg.Content = msg;                });            }        }    }    // 处理结果的委托    public delegate void ShowLoadResultDelegate(Stream stream);    public delegate void ShowSaveResultDelegate(String s);}

3、数据流异步下载部分ServerStreamLoad.cs：

using System;using System.Net;using System.Windows;using System.Windows.Controls;using System.Windows.Documents;using System.Windows.Ink;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Animation;using System.Windows.Shapes;using System.IO;namespace RichEdit{    public class ServerStreamLoad    {        ShowLoadResultDelegate rp;        public ShowLoadResultDelegate Rp        {            get { return rp; }            set { rp = value; }        }        public void Load(String uri)        {            WebClient webClient = new WebClient();            webClient.OpenReadCompleted += new OpenReadCompletedEventHandler(LoadCompletedCallBack);            webClient.OpenReadAsync(new Uri(uri));        }        private void LoadCompletedCallBack(object sender, OpenReadCompletedEventArgs e)        {            using (Stream stream = e.Result)            {                // read stream here                rp(stream);            }        }    }}

4、数据流异步提交部分：

using System;using System.Net;using System.Windows;using System.Windows.Controls;using System.Windows.Documents;using System.Windows.Ink;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Animation;using System.Windows.Shapes;using System.IO;using System.Collections.Generic;using System.Windows.Threading;namespace RichEdit{    public class ServerStreamSave    {        static ShowSaveResultDelegate rp;        public ShowSaveResultDelegate Rp        {            get { return rp; }            set { rp = value; }        }        public void Save(WebRequest request, Dictionary<String, String> nvc, Stream stream)        {            request.Method = "POST";            UploadState us = new UploadState();            us.Req = request;            us.Nvc = nvc;            us.Stream = stream;            request.BeginGetRequestStream(new AsyncCallback(SaveRequestReadyCallBack), us);        }        private void SaveRequestReadyCallBack(IAsyncResult asyncResult)        {            string boundary = "---------------------------" + DateTime.Now.Ticks.ToString("x");            byte[] boundarybytes = System.Text.Encoding.UTF8.GetBytes("\r\n--" + boundary + "\r\n");            WebRequest request = ((UploadState)(asyncResult.AsyncState)).Req as WebRequest;            request.ContentType = "multipart/form-data; boundary=" + boundary;            request.UseDefaultCredentials = true;            Stream rs = request.EndGetRequestStream(asyncResult);            // 1.write boundery and key-value pairs            string formdataTemplate = "Content-Disposition: form-data; name=\"{0}\"\r\n\r\n{1}";            IDictionary<String, String> nvc = ((UploadState)(asyncResult.AsyncState)).Nvc as IDictionary<String, String>;            foreach (string key in nvc.Keys)            {                rs.Write(boundarybytes, 0, boundarybytes.Length);                string formitem = string.Format(formdataTemplate, key, nvc[key]);                byte[] formitembytes = System.Text.Encoding.UTF8.GetBytes(formitem);                rs.Write(formitembytes, 0, formitembytes.Length);            }            rs.Write(boundarybytes, 0, boundarybytes.Length);            // 2.write head            string file = "file";            string paramName = "file";            string contentType = "unknown";            string headerTemplate = "Content-Disposition: form-data; name=\"{0}\"; filename=\"{1}\"\r\nContent-Type: {2}\r\n\r\n";            string header = string.Format(headerTemplate, paramName, file, contentType);            byte[] headerbytes = System.Text.Encoding.UTF8.GetBytes(header);            rs.Write(headerbytes, 0, headerbytes.Length);            // 3.write stream here，the stream will be closed by invoker            using (Stream stream = ((UploadState)(asyncResult.AsyncState)).Stream as Stream)            {                stream.Position = 0;                //byte[] buffer = System.Text.Encoding.UTF8.GetBytes("aaa我11");                byte[] data = new byte[4096];                int count = stream.Read(data, 0, 4096);                while (count > 0)                {                    rs.Write(data, 0, count);                    count = stream.Read(data, 0, 4096);                }            }            //rs.Write(buffer, 0, buffer.Length);            // 4.write trailer            byte[] trailer = System.Text.Encoding.UTF8.GetBytes("\r\n--" + boundary + "--\r\n");            rs.Write(trailer, 0, trailer.Length);            rs.Flush();            rs.Close();            request.BeginGetResponse(new AsyncCallback(SaveResponseReadyCallBack), request);        }        private void SaveResponseReadyCallBack(IAsyncResult asyncResult)        {            WebRequest request = asyncResult.AsyncState as WebRequest;            WebResponse response = request.EndGetResponse(asyncResult);            using (Stream responseStream = response.GetResponseStream())            {                StreamReader reader = new StreamReader(responseStream);                // check response result by return msg.                String msg = reader.ReadToEnd();                rp(msg);            }        }    }}

5、异步请求提交，回调封装参数部分UploadState.cs：

using System;using System.Net;using System.Windows;using System.Windows.Controls;using System.Windows.Documents;using System.Windows.Ink;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Animation;using System.Windows.Shapes;using System.Collections;using System.Collections.Generic;using System.IO;namespace RichEdit{    public class UploadState    {        IDictionary<String, String> nvc = null;        public IDictionary<String, String> Nvc        {            get { return nvc; }            set { nvc = value; }        }        WebRequest req = null;        public WebRequest Req        {            get { return req; }            set { req = value; }        }        Stream stream;        public Stream Stream        {            get { return stream; }            set { stream = value; }        }    }}

（二）服务器端使用commons-fileupload-1.2.2.jar实现上传：

1、web.xml配置：

<servlet><display-name>UploadServlet</display-name><servlet-name>UploadServlet</servlet-name><servlet-class>com.liyj.upload.servlet.UploadServlet</servlet-class></servlet><servlet-mapping><servlet-name>UploadServlet</servlet-name><url-pattern>/UploadServlet</url-pattern></servlet-mapping>

2、UploadServlet.java（取打包的参数和附件）

package com.liyj.upload.servlet;import java.io.*;import java.util.List;import javax.servlet.*;import javax.servlet.http.*;import org.apache.commons.fileupload.FileItem;import org.apache.commons.fileupload.FileUploadException;import org.apache.commons.fileupload.disk.DiskFileItemFactory;import org.apache.commons.fileupload.servlet.ServletFileUpload;public class UploadServlet extends HttpServlet {public void init(ServletConfig config) throws ServletException {super.init(config);}public void doGet(HttpServletRequest request, HttpServletResponse response) {ServletOutputStream out = null;System.out.println("into doGet..");try {out = response.getOutputStream();FileInputStream fis = new FileInputStream("D:\\file");byte[] data = new byte[4096];int count = fis.read(data);while(count > 0) {out.write(data, 0, count);count = fis.read(data);}fis.close();out.flush();out.close();} catch (Exception e){e.printStackTrace();}}public void doPost(HttpServletRequest request, HttpServletResponse response) {ServletOutputStream out = null;System.out.println("into doPost..");DiskFileItemFactory factory = new DiskFileItemFactory();        String path = "D:\\";        factory.setRepository(new File(path));        factory.setSizeThreshold(1024 * 1024);        ServletFileUpload upload = new ServletFileUpload(factory);                try {        out = response.getOutputStream();                    List<FileItem> list = upload.parseRequest(request);            for (FileItem item : list) {                if (item.isFormField()) {                    String name = item.getFieldName();                    String value = item.getString("gbk");                    out.println(name + ":" + value);                } else {                    String name = item.getFieldName();                    String value = item.getName();                    int start = value.lastIndexOf("\\");                    String fileName = value.substring(start + 1);                    //request.setAttribute(name, fileName);                                        OutputStream os = new FileOutputStream(new File(path, fileName));                    InputStream is = item.getInputStream();                    byte[] buffer = new byte[1024];                    int length = 0;                    int fileLen = 0;                    while ((length = is.read(buffer)) > 0) {                        os.write(buffer, 0, length);                        fileLen += length;                    }                    out.println("OK");                    os.close();                    is.close();                }            }        } catch (Exception e) {        try {out.println("NG");} catch (IOException e1) {// TODO Auto-generated catch blocke1.printStackTrace();}            e.printStackTrace();        }}}

---------- THE END-----------