非常方便之dwr上传文件。

项目结构图

加入所需的 jar 包。

commons-logging-1.1.1.jar

dwr.jar

这两个是 dwr 环境所必须的。

commons-fileupload-1.3.1.jar

commons-io-2.4.jar

这两个是上次文件所必须的。

web.xml 配置 dwr

<servlet>
<servlet-name>dwr-invoker</servlet-name>
<servlet-class>
org.directwebremoting.servlet.DwrServlet
</servlet-class>
<init-param>
<param-name>debug</param-name>
<param-value>true</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>dwr-invoker</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>

2. 创建 Upload.java

packagecom.service;

importjava.io.File;
importjava.io.IOException;
importjava.io.InputStream;

importjavax.servlet.http.HttpServletRequest;

importorg.apache.commons.io.FileUtils;
importorg.apache.commons.io.FilenameUtils;
importorg.directwebremoting.WebContext;
importorg.directwebremoting.WebContextFactory;


publicclassUpload{
	
	publicStringupload(InputStreamis,StringfileName)throwsIOException{
		//dwr通过WebContext取得HttpServletRequest
		WebContextwc=WebContextFactory.get();
		HttpServletRequestreq=wc.getHttpServletRequest();
		
		Stringrealpath=req.getSession().getServletContext().getRealPath("upload");//获取根目录下upload文件下路径
		Stringfn=FilenameUtils.getName(fileName);//获取上传的文件的名称
		Stringfilepath=realpath+"/"+fn;//文件上传存放的路径
		FileUtils.copyInputStreamToFile(is,newFile(filepath));//将输入流直接copy成文件
		
		returnfilepath;
	}

}

3. 创建 dwr.xml,配置 Upload.java 映射

<dwr>
	<allow>
		<createcreator="new"javascript="Upload">
			<paramname="class"value="com.service.Upload"/>
		</create>
	</allow>
</dwr>

4. 创建upload.jsp

<%@pagelanguage="java"import="java.util.*"pageEncoding="utf-8"%>
<%
Stringpath=request.getContextPath();
StringbasePath=request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.01Transitional//EN">
<html>
<head>
<basehref="<%=basePath%>">
<title>dwr上传文件</title>
</head>
<scripttype='text/javascript'src='dwr/engine.js'></script>
<scripttype='text/javascript'src='dwr/util.js'></script>
<scripttype="text/javascript"src="dwr/interface/Upload.js"></script>

<scripttype="text/javascript">
	functionupload(){
		varfile=dwr.util.getValue("myfile");
		Upload.upload(file,file.value,function(data){
			alert(data);
		});
	}
</script>
<body>

<inputtype="file"id="myfile"/>
<inputtype="button"value="上传"onclick="upload();"/>

</body>
</html>

upload.jsp 中，需要引入

<scripttype='text/javascript'src='dwr/engine.js'></script>
<scripttype='text/javascript'src='dwr/util.js'></script>
<scripttype="text/javascript"src="dwr/interface/Upload.js"></script>

其中

<scripttype="text/javascript"src="dwr/interface/Upload.js"></script>

是我们配置的 Upload.java

直接Upload.upload(file，fileName); 即可调用Upload.java 中的 upload 方法执行上传操作。

上传成功后，可以到部署路径下upload文件夹下查看所上传的文件。

有需要源码的：源码

非常方便之dwr上传文件。

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