下面的代码用于显示来自服务器文件夹的图像，但列表显示的是无法解析的类型。使用servlet代码“private static final String UPLOAD_DIRECTORY = "upload";”将图像上传到文件夹中 现在我想将所有图像显示到 jsp 页面。请帮忙
<%@ page import ="java.io.*"%>;
<%@ page import ="java.io.File.*"%>;
<%@ page import="java.sql.*"%>
<%@ page import="javax.sql.*"%>
<%@ page import ="java.util.ArrayList.*"%>
<%@ page import ="java.util.List.*"%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>File Upload Example</title>
</head>
<body>
<div id="result">
<h3>${requestScope["message"]}</h3>
</div>
<%
List imageUrlList = new ArrayList(); //List cannot be resolved type
File imageDir = new File("Upload");
for (File imageFile : imageDir.listFiles()) {
String imageFileName = imageFile.getName();
// add this images name to the list we are building up
imageUrlList.add(imageFileName);
}
request.setAttribute("imageUrlList", imageUrlList);
%>
<c:forEach var="img" items="${imageUrlList}">
<img src="${imageUrlList}"/>
</c:forEach>
</body>
</html>
您的导入是错误的，List/ArrayList 是类而不是包，因此您需要删除 .*
<%@ page import ="java.util.ArrayList"%>
<%@ page import ="java.util.List"%>