DWR 文件上傳 Failed to find parameter: scriptSessionId
出現這種錯誤 ， 是由於 dwr 在發送 request 的時候， 其被 Struts2的 filter 攔截了
一般情況下是由於在 web.xml 中 Struts 的 url-pattern 寫成 /* 了
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping
正確的寫法是如下： Struts 只是攔截指定類型的請求
在 web.xml 中：
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>*.action</url-pattern>
</filter-mapping>
<servlet-mapping>
<servlet-name>dwr-invoker</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>
java
public String upload(InputStream inputStream, String filename)
throws Exception {
WebContext wc = WebContextFactory.get();
HttpServletRequest req = wc.getHttpServletRequest();
String realpath = req.getSession().getServletContext()
.getRealPath("upload");
String fn = FilenameUtils.getName(filename);
String filepath = realpath + "/" + fn;
FileUtils.copyInputStreamToFile(inputStream, new File(filepath));
return filepath;
}
jsp和 js
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
<script type="text/javascript" src="dwr/engine.js"></script>
<script type="text/javascript" src="dwr/util.js"></script>
<script type="text/javascript" src="dwr/interface/booksManage.js"></script>
<script type="text/javascript" src="js/myjavascript.js"></script>
<script type="text/javascript">
//使用dwr實現Ajax上傳圖片
function uploadImg() {
var file = dwr.util.getValue("imgFile");
alert(file.value);
alert(file);
booksManage.upload(file,file.value,function(data){
alert(data);
$("img").src = "upload/"+file.value ;
});
}
</script>
</head>
<body>
選擇圖片<input type="file" id="imgFile"/><br/>
<input type="button" id="uploadImgButton" value="上傳" οnclick="uploadImg()"/><br/>
<img alt="" src="onepice.jpg" style="margin: 100px,auto; width: 100px;" id="img"/>
</body>
</html>