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我是Google App Engine的新手,所以希望能幫到我。Google App Engine:獲取實體媒體資源的源代碼鏈接
我想獲得一個實體的屬性(想下載一個JSON)的源鏈接,但無法弄清楚如何。
這是代碼:
<%-- //[START all]--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page import="com.google.appengine.api.users.User" %>
<%@ page import="com.google.appengine.api.users.UserService" %>
<%@ page import="com.google.appengine.api.users.UserServiceFactory" %>
<%-- //[START imports]--%>
<%@ page import="com.google.appengine.api.datastore.DatastoreService" %>
<%@ page import="com.google.appengine.api.datastore.DatastoreServiceFactory" %>
<%@ page import="com.google.appengine.api.datastore.Entity" %>
<%@ page import="com.google.appengine.api.datastore.FetchOptions" %>
<%@ page import="com.google.appengine.api.datastore.Key" %>
<%@ page import="com.google.appengine.api.datastore.KeyFactory" %>
<%@ page import="com.google.appengine.api.datastore.Query" %>
<%-- //[END imports]--%>
<%@ page import="java.util.List" %>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
<html>
<head>
<link type="text/css" rel="stylesheet" href="/stylesheets/main.css"/>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<title>Mandatory Assigment 2</title>
</head>
<body>
<h1>Mandatory Assignment 2</h1>
<p>This page shows the CSV files uploaded</p>
<h2>Uploaded CSV files</h2>
<%-- //[START datastore]--%>
<%
DatastoreService datastore = DatastoreServiceFactory.getDatastoreService();
Key guestbookKey = KeyFactory.createKey("Guestbook", "guestbookName");
// Run an ancestor query to ensure we see the most up-to-date
// view of the Greetings belonging to the selected Guestbook.
Query query = new Query("Greeting", guestbookKey).addSort("date", Query.SortDirection.DESCENDING);
List<Entity> greetings = datastore.prepare(query).asList(FetchOptions.Builder.withLimit(5));
if (greetings.isEmpty()) {
%>
<p>There are no CSV files. Please refresh to reload</p>
<%
} else {
%>
<p>CSV files: </p>
<%
for (Entity greeting : greetings) {
pageContext.setAttribute("greeting_content",
greeting.getProperty("content"));
if (greeting.getProperty("user") == null) {
%>
<p>An anonymous person wrote:</p>
<%
} else {
pageContext.setAttribute("greeting_user",
greeting.getProperty("user"));
%>
<p>json string: ${fn:escapeXml(greeting_content)}</a></a></p>
<%
}
%>
<blockquote></blockquote>
<%
}
}
%>
</body>
</html>
<%-- //[END all]--%>
的「$ {FN:將escapeXml(greeting_content)}」代碼輸出JSON作爲一個字符串,但我希望能夠下載JSON,而不是像這樣:
<p><a href="${fn:escapeXml(greeting_content)}">download JSON</a></a></p>
有人可以幫我嗎?我會很感激!
考慮加入一些解釋,以提高你的答案質量的格式。 –
對不起,添加下載屬性,您可以使用您指定的格式下載內容。 –
好的,謝謝。但是這裏出現了一個天真的問題:下載=「name.json」怎麼知道在哪裏找到正確的json? –