publicId和systemId之间必须有空格

秦经义

2023-03-14

问题内容：

我试图通过在jsp中编写一些代理代码来从我的计算机本地向其他域进行ajax调用。这是我的jQuery AJAX代码，正在调用proxy.jsp页面。

 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
        });
    };

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，我正在解析的XML文件收到此错误：

<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>

我在这里做什么错..任何建议将不胜感激..

问题答案：

错误消息实际上是正确的，如果不是很明显的话。它说您的DOCTYPE必须具有SYSTEM标识符。我认为您的只有一个公共标识符。

您将获得错误（例如）：

<!DOCTYPE persistence PUBLIC
    "http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd">

您不会：

<!DOCTYPE persistence PUBLIC
    "http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd" "">

请注意""，第二个末尾是系统标识符。该错误消息令人困惑：应该说您需要一个系统标识符，而不是在publicId和（不存在的）systemId之间需要一个空格。

顺便说一句，一个空的系统标识符可能不是理想的选择，但足以让您感动。

publicId和systemId之间必须有空格

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