我正在尝试通过在 jsp 中编写一些代理代码，从我的计算机本地对其他域进行 ajax 调用。这是我调用 proxy.jsp 页面的 jQuery AJAX 代码。
var metadata = 'https://rest-search.host.com/machine/search/meta?id=';
var on_show_info= function() {
var AjaxCall = data + current_doc_info.id;
alert(AjaxCall);
request_meta_info = $.ajax({
url: "proxy.jsp?url=" + AjaxCall,
type: 'GET',
success: check,
error: error
});
};
而我的 JSP 文件是:-
<%@ page language="java" import="org.w3c.dom.*,javax.xml.parsers.DocumentBuilder,javax.xml.parsers.DocumentBuilderFactory,java.net.*,java.io.*" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%
String urlToQuery = request.getParameter("url");
System.out.println("rj " +urlToQuery);
URL url = new URL(urlToQuery);
final String login ="user";
final String password ="pass";
Authenticator.setDefault(new Authenticator() {
protected PasswordAuthentication getPasswordAuthentication() {
return new PasswordAuthentication (login, password.toCharArray());
}
});
URLConnection conn = url.openConnection();
InputStream in = conn.getInputStream();
DocumentBuilderFactory dbf=DocumentBuilderFactory.newInstance();
DocumentBuilder db =dbf.newDocumentBuilder();
Document doc=db.parse(urlToQuery);
NodeList nl= doc.getElementsByTagName("attr");
%>
<%= nl.item(0).getFirstChild().getNodeValue() %>
当我检查响应时，我收到它正在解析的 XML 文件的错误:
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"/>
<title>Error 500 White spaces are required between publicId and systemId.</title>
</head>
<body><h2>HTTP ERROR 500</h2>
<p>Problem accessing /proxy.jsp. Reason:
<pre> White spaces are required between publicId and systemId.</pre></p><h3>Caused by:</h3><pre>org.xml.sax.SAXParseException: White spaces are required between publicId and systemId.
at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)
at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source)
at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:180)
at org.apache.jsp.proxy_jsp._jspService(org.apache.jsp.proxy_jsp:70)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:109)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:389)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:486)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:380)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:390)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:327)
at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:126)
at org.tuckey.web.filters.urlrewrite.NormalRewrittenUrl.doRewrite(NormalRewrittenUrl.java:213)
at org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:171)
at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:145)
at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:92)
at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:381)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:67)
at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:122)
at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:110)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:230)
at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
at org.mortbay.jetty.Server.handle(Server.java:326)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:536)
at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:915)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:539)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:405)
at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
</pre>
<hr /><i><small>Powered by Jetty://</small></i><br/>
</body>
</html>
XML 文件是这样的:-
<results><result><attr value="HW/SW" name="Line"/><attr value="ASIC" name="Description"/><attr value="CD" name="Number"/><attr value="AS" name="DocumentType"/><attr value="" name="Date"/><</result></results>
我在这里做错了什么..任何建议将不胜感激..
最佳答案
如果不明显，错误消息实际上是正确的。它说你的 DOCTYPE 必须有一个 SYSTEM 标识符。我假设你的只有一个公共(public)标识符。
你会得到错误(例如):
<!DOCTYPE persistence PUBLIC
"http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">
你不会:
<!DOCTYPE persistence PUBLIC
"http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" "">
注意第二个末尾的 "" -- 那是系统标识符。错误消息令人困惑:它应该说您需要一个系统标识符，而不是您需要在 publicId 和(不存在的)systemId 之间有一个空格。
顺便说一句，一个空的系统标识符可能并不理想，但它可能足以让你动起来。
关于java - publicId 和 systemId 之间需要空格，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/6514158/