DWR 3.0 上传文件

nelsonyang

DWR 3.0 上传文件
关键字: dwr 3.0 无刷新 上传文件 upload file
第一步：需要文件包，其实就是dwr 3.0中例子所需要的包， dwr.jar 、 commons-fileupload-1.2.jar 、 commons-io-1.3.1.jar 。







第二步：编辑web.xml，添加dwr-invoke

Xml代码
<servlet>  
    <display-name>DWR Sevlet</display-name>  
    <servlet-name>dwr-invoker</servlet-name>  
    <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>  
    <init-param>  
        <description>是否打开调试功能</description>  
        <param-name>debug</param-name>  
        <param-value>true</param-value>  
    </init-param>  
    <init-param>  
        <description>日志级别有效值为： FATAL, ERROR, WARN (the default), INFO and DEBUG.</description>  
        <param-name>logLevel</param-name>  
        <param-value>DEBUG</param-value>  
    </init-param>  
    <init-param>  
        <description>是否激活反向Ajax</description>  
        <param-name>activeReverseAjaxEnabled</param-name>  
        <param-value>true</param-value>  
    </init-param>  
    <init-param>     
         <description>在WEB启动时是否创建范围为application的creator</description>     
         <param-name>initApplicationScopeCreatorsAtStartup</param-name>     
         <param-value>true</param-value>     
    </init-param>     
    <init-param>  
        <description>在WEB启动时是否创建范围为application的creator</description>     
        <param-name>preferDataUrlSchema</param-name>  
        <param-value>false</param-value>  
    </init-param>  
        <load-on-startup>1</load-on-startup>     
      
</servlet>  
<servlet-mapping>  
    <servlet-name>dwr-invoker</servlet-name>  
    <url-pattern>/dwr/*</url-pattern>  
</servlet-mapping>  

<servlet>
<display-name>DWR Sevlet</display-name>
<servlet-name>dwr-invoker</servlet-name>
<servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
<init-param>
<description>是否打开调试功能</description>
<param-name>debug</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<description>日志级别有效值为： FATAL, ERROR, WARN (the default), INFO and DEBUG.</description>
<param-name>logLevel</param-name>
<param-value>DEBUG</param-value>
</init-param>
<init-param>
<description>是否激活反向Ajax</description>
<param-name>activeReverseAjaxEnabled</param-name>
<param-value>true</param-value>
</init-param>
<init-param>  
     <description>在WEB启动时是否创建范围为application的creator</description>  
     <param-name>initApplicationScopeCreatorsAtStartup</param-name>  
     <param-value>true</param-value>  
</init-param>  
<init-param>
<description>在WEB启动时是否创建范围为application的creator</description>  
   <param-name>preferDataUrlSchema</param-name>
    <param-value>false</param-value>
    </init-param>
<load-on-startup>1</load-on-startup>  

</servlet>
<servlet-mapping>
<servlet-name>dwr-invoker</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>


第三步：创建上传类FileUpload.java，编辑代码，内容如下：

Java代码
package learn.dwr.upload_download;   
  
import java.awt.Color;   
import java.awt.Font;   
import java.awt.Graphics2D;   
import java.awt.geom.AffineTransform;   
import java.awt.image.AffineTransformOp;   
import java.awt.image.BufferedImage;   
import java.io.File;   
import java.io.FileOutputStream;   
import java.io.InputStream;   
import org.directwebremoting.WebContext;   
import org.directwebremoting.WebContextFactory;   
  
/**  
* title: 文件上传  
* @author Administrator  
* @时间 2009-11-22:上午11:40:22  
*/  
public class FileUpload {   
  
    /**  
     * @param uploadImage 圖片文件流  
     * @param uploadFile 需要用简单的文本文件，如：.txt文件，不然上传会出乱码  
     * @param color  
     * @return  
     */  
    public BufferedImage uploadFiles(BufferedImage uploadImage,   
            String uploadFile, String color) {   
        // uploadImage = scaleToSize(uploadImage);   
        // uploadImage =grafitiTextOnImage(uploadImage, uploadFile, color);   
        return uploadImage;   
    }   
  
    /**  
     * 文件上传时使用InputStream类进行接收，在DWR官方例中是使用String类接收简单内容  
     *   
     * @param uploadFile  
     * @return  
     */  
    public String uploadFile(InputStream uploadFile, String filename)   
            throws Exception {   
        WebContext webContext = WebContextFactory.get();   
        String realtivepath = webContext.getContextPath() + "/upload/";   
        String saveurl = webContext.getHttpServletRequest().getSession()   
                .getServletContext().getRealPath("/upload");   
        File file = new File(saveurl + "/" + filename);   
        // if (!file.exists()) {   
        // file.mkdirs();   
        // }   
        int available = uploadFile.available();   
        byte[] b = new byte[available];   
        FileOutputStream foutput = new FileOutputStream(file);   
        uploadFile.read(b);   
        foutput.write(b);   
        foutput.flush();   
        foutput.close();   
        uploadFile.close();   
        return realtivepath + filename;   
    }   
  
    private BufferedImage scaleToSize(BufferedImage uploadImage) {   
        AffineTransform atx = new AffineTransform();   
        atx   
                .scale(200d / uploadImage.getWidth(), 200d / uploadImage   
                        .getHeight());   
        AffineTransformOp atfOp = new AffineTransformOp(atx,   
                AffineTransformOp.TYPE_BILINEAR);   
        uploadImage = atfOp.filter(uploadImage, null);   
        return uploadImage;   
    }   
  
    private BufferedImage grafitiTextOnImage(BufferedImage uploadImage,   
            String uploadFile, String color) {   
        if (uploadFile.length() < 200) {   
            uploadFile += uploadFile + " ";   
        }   
        Graphics2D g2d = uploadImage.createGraphics();   
        for (int row = 0; row < 10; row++) {   
            String output = "";   
            if (uploadFile.length() > (row + 1) * 20) {   
                output += uploadFile.substring(row * 20, (row + 1) * 20);   
            } else {   
                output = uploadFile.substring(row * 20);   
            }   
            g2d.setFont(new Font("SansSerif", Font.BOLD, 16));   
            g2d.setColor(Color.blue);   
            g2d.drawString(output, 5, (row + 1) * 20);   
        }   
        return uploadImage;   
    }   
}  

package learn.dwr.upload_download;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;
import java.awt.image.AffineTransformOp;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import org.directwebremoting.WebContext;
import org.directwebremoting.WebContextFactory;

/**
* title: 文件上传
* @author Administrator
* @时间 2009-11-22:上午11:40:22
*/
public class FileUpload {

/**
* @param uploadImage 圖片文件流
* @param uploadFile 需要用简单的文本文件，如：.txt文件，不然上传会出乱码
* @param color
* @return
*/
public BufferedImage uploadFiles(BufferedImage uploadImage,
String uploadFile, String color) {
// uploadImage = scaleToSize(uploadImage);
// uploadImage =grafitiTextOnImage(uploadImage, uploadFile, color);
return uploadImage;
}

/**
* 文件上传时使用InputStream类进行接收，在DWR官方例中是使用String类接收简单内容
*
* @param uploadFile
* @return
*/
public String uploadFile(InputStream uploadFile, String filename)
throws Exception {
WebContext webContext = WebContextFactory.get();
String realtivepath = webContext.getContextPath() + "/upload/";
String saveurl = webContext.getHttpServletRequest().getSession()
.getServletContext().getRealPath("/upload");
File file = new File(saveurl + "/" + filename);
// if (!file.exists()) {
// file.mkdirs();
// }
int available = uploadFile.available();
byte[] b = new byte[available];
FileOutputStream foutput = new FileOutputStream(file);
uploadFile.read(b);
foutput.write(b);
foutput.flush();
foutput.close();
uploadFile.close();
return realtivepath + filename;
}

private BufferedImage scaleToSize(BufferedImage uploadImage) {
AffineTransform atx = new AffineTransform();
atx
.scale(200d / uploadImage.getWidth(), 200d / uploadImage
.getHeight());
AffineTransformOp atfOp = new AffineTransformOp(atx,
AffineTransformOp.TYPE_BILINEAR);
uploadImage = atfOp.filter(uploadImage, null);
return uploadImage;
}

private BufferedImage grafitiTextOnImage(BufferedImage uploadImage,
String uploadFile, String color) {
if (uploadFile.length() < 200) {
uploadFile += uploadFile + " ";
}
Graphics2D g2d = uploadImage.createGraphics();
for (int row = 0; row < 10; row++) {
String output = "";
if (uploadFile.length() > (row + 1) * 20) {
output += uploadFile.substring(row * 20, (row + 1) * 20);
} else {
output = uploadFile.substring(row * 20);
}
g2d.setFont(new Font("SansSerif", Font.BOLD, 16));
g2d.setColor(Color.blue);
g2d.drawString(output, 5, (row + 1) * 20);
}
return uploadImage;
}
}
第四步：添加到dwr.xml

Java代码
<create creator="new">   
    <param name="class" value="learn.dwr.upload_download.FileUpload" />   
</create>  

<create creator="new">
<param name="class" value="learn.dwr.upload_download.FileUpload" />
</create> 第五步：添加前台html代码

Html代码
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">  
<html xmlns="http://www.w3.org/1999/xhtml">  
<head>  
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />  
<title>二进制文件处理，文件上传</title>  
<script type='text/javascript' src='/learnajax/dwr/interface/FileUpload.js'></script>  
<script type='text/javascript' src='/learnajax/dwr/engine.js'></script>  
<script type='text/javascript' src='/learnajax/dwr/util.js'></script>  
<script type='text/javascript' >  
function uploadFiles(){   
    var uploadImage = dwr.util.getValue("uploadImage");   
     FileUpload.uploadFiles(uploadImage, "", "", function(imageURL) {   
        alert(imageURL);   
        dwr.util.setValue('image', imageURL);   
  });   
  
}   
function uploadFile(){   
    var uploadFile = dwr.util.getValue("uploadFile");   
    //var uploadFile =document.getElementById("uploadFile").value;   
    var uploadFileuploadFile_temp = uploadFile.value.replace("\\","/");   
    var filenames = uploadFile.value.split("/");   
    var filename = filenames[filenames.length-1];   
    //var eextension = e[e.length-1];   
    FileUpload.uploadFile(uploadFile,filename,function(data){   
        var file_a= document.getElementById("file_a");   
        file_a.href=data;   
        file_a.innerHTML=data;   
        document.getElementById("filediv").style.display="";   
    });   
}   
      
</script>  
</head>  
  
<body>  
<table border="1" cellpadding="3" width="50%">  
    <tr>  
        <td>Image</td>  
        <td><input type="file" id="uploadImage" /></td>  
        <td><input type="button"  value="upload"/><div id="image.container"> </div></td>  
    </tr>  
    <tr>  
        <td>File</td>  
        <td><input type="file" id="uploadFile" /></td>  
        <td><input type="button"  value="upload"/><div id="file.container"> </div></td>  
    </tr>  
    <tr>  
        <td colspan="3"></td>  
    </tr>  
</table>  
<img id="image" src="javascript:void(0);"/>  
<div id="filediv" style="display:none;">  
<a href="" id="file_a">上传的文件</a>  
</div>  
</body>  
</html>  

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>二进制文件处理，文件上传</title>
<script type='text/javascript' src='/learnajax/dwr/interface/FileUpload.js'></script>
<script type='text/javascript' src='/learnajax/dwr/engine.js'></script>
<script type='text/javascript' src='/learnajax/dwr/util.js'></script>
<script type='text/javascript' >
function uploadFiles(){
var uploadImage = dwr.util.getValue("uploadImage");
FileUpload.uploadFiles(uploadImage, "", "", function(imageURL) {
alert(imageURL);
    dwr.util.setValue('image', imageURL);
  });

}
function uploadFile(){
var uploadFile = dwr.util.getValue("uploadFile");
//var uploadFile =document.getElementById("uploadFile").value;
var uploadFile_temp = uploadFile.value.replace("\\","/");
var filenames = uploadFile.value.split("/");
var filename = filenames[filenames.length-1];
//var extension = e[e.length-1];
FileUpload.uploadFile(uploadFile,filename,function(data){
var file_a= document.getElementById("file_a");
file_a.href=data;
file_a.innerHTML=data;
document.getElementById("filediv").style.display="";
});
}

</script>
</head>

<body>
<table border="1" cellpadding="3" width="50%">
<tr>
    <td>Image</td>
        <td><input type="file" id="uploadImage" /></td>
        <td><input type="button"  value="upload"/><div id="image.container"> </div></td>
    </tr>
    <tr>
    <td>File</td>
        <td><input type="file" id="uploadFile" /></td>
        <td><input type="button"  value="upload"/><div id="file.container"> </div></td>
    </tr>
    <tr>
    <td colspan="3"></td>
    </tr>
</table>
<img id="image" src="javascript:void(0);"/>
<div id="filediv" style="display:none;">
<a href="" id="file_a">上传的文件</a>
</div>
</body>
</html>
  
添加进度条么，就需要用reverse ajax 进行配合使用了。