com.gargoylesoftware.htmlunit.ScriptException：TypeError：无法调用null

时间：2015-06-11 06:21:10

标签： javascript htmlunit appendchild document.write

使用htmlunit webclient.getPage（）方法打开login.html，并从ajax请求result.html获取html，无法执行body.appendChild。因为document.body为null。例如：

login.html代码： 

<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=GBK" /> 
    </head>
    <script>
    function getContent(){ 
        var url= "result.html"; 
        var xhr=new (window.XMLHttpRequest||window.ActiveXObject)("Microsoft.XMLHTTP");
        xhr.onreadystatechange = function() { 
            if (xhr.readyState == 4 && xhr.status == 200) {
                document.write(xhr.responseText); 
                document.close(); 
            }
        }; 
        xhr.open("GET",url,false); xhr.send(); 
    }
    getContent(); 
    </script>
</html>

result.html代码： 

<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=GBK"/>
        <title>login</title> 
    </head>
    <body>
        <script type="text/javascript"> 
            var d = document, b = d.body; 
            var n = d.createElement("div"); 
            n.innerHTML = "<div> I was appended... </div>"; 
            b.appendChild(n); 
        </script>
    </body>
</html>

测试用例代码： 

@Test public void testExecScript() throws Exception { 
    WebClient client = new WebClient(BrowserVersion.CHROME);
    client.getOptions().setUseInsecureSSL(true);
    client.getOptions().setJavaScriptEnabled(true); 
    client.getOptions().setCssEnabled(false); 
    client.getOptions().setThrowExceptionOnScriptError(false); 
    client.getOptions().setTimeout(10000); 
    String url = "http://localhost/login.html";
    HtmlPage loginPage = client.getPage(url); 
    logger.info("{}\n{}", loginPage.getTitleText(), loginPage.asXml()); 
}

异常输出： 

EcmaError: lineNumber=[1] column=[0] lineSource=[<no source>] name=[TypeError] sourceName=[script in http://localhost/login.html from (1, 1462) to (1, 1780)] message=[TypeError: Cannot call method "appendChild" of null (script in login.html from (1, 1462) to (1, 1780)#1)]
com.gargoylesoftware.htmlunit.ScriptException: TypeError: Cannot call method "appendChild" of null (script in login.html from (1, 1462) to (1, 1780)#1)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:847)
at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:620)
at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:513)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:733)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:708)
at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptIfPossible(HtmlPage.java:982)
at com.gargoylesoftware.htmlunit.html.HtmlScript.executeInlineScriptIfNeeded(HtmlScript.java:351)
at com.gargoylesoftware.htmlunit.html.HtmlScript.executeScriptIfNeeded(HtmlScript.java:411)
at com.gargoylesoftware.htmlunit.html.HtmlScript$3.execute(HtmlScript.java:276)
at com.gargoylesoftware.htmlunit.html.HtmlScript.onAllChildrenAddedToPage(HtmlScript.java:290)
at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.endElement(HTMLParser.java:793)
at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)
at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.endElement(HTMLParser.java:751)
at org.cyberneko.html.HTMLTagBalancer.callEndElement(HTMLTagBalancer.java:1170)
at org.cyberneko.html.HTMLTagBalancer.endElement(HTMLTagBalancer.java:1072)
at org.cyberneko.html.filters.DefaultFilter.endElement(DefaultFilter.java:206)
at org.cyberneko.html.filters.NamespaceBinder.endElement(NamespaceBinder.java:330)
at org.cyberneko.html.HTMLScanner$ContentScanner.scanEndElement(HTMLScanner.java:3126)
at org.cyberneko.html.HTMLScanner$ContentScanner.scan(HTMLScanner.java:2093)
at org.cyberneko.html.HTMLScanner.evaluateInputSource(HTMLScanner.java:608)
at org.cyberneko.html.HTMLConfiguration.evaluateInputSource(HTMLConfiguration.java:342)
at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.pushInputString(HTMLParser.java:420)
at com.gargoylesoftware.htmlunit.html.HtmlPage.writeInParsedStream(HtmlPage.java:2375)
at com.gargoylesoftware.htmlunit.javascript.host.html.HTMLDocument.write(HTMLDocument.java:683)
at com.gargoylesoftware.htmlunit.javascript.host.html.HTMLDocument.write(HTMLDocument.java:569)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at net.sourceforge.htmlunit.corejs.javascript.MemberBox.invoke(MemberBox.java:153)
at net.sourceforge.htmlunit.corejs.javascript.FunctionObject.call(FunctionObject.java:384)
at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpretLoop(Interpreter.java:1531)
at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpret(Interpreter.java:798)
at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.call(InterpretedFunction.java:105)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$4.doRun(JavaScriptEngine.java:772)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:832)
at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:620)
at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:513)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.callFunction(JavaScriptEngine.java:779)
at com.gargoylesoftware.htmlunit.javascript.host.xml.XMLHttpRequest.setState(XMLHttpRequest.java:218)
at com.gargoylesoftware.htmlunit.javascript.host.xml.XMLHttpRequest.doSend(XMLHttpRequest.java:762)
at com.gargoylesoftware.htmlunit.javascript.host.xml.XMLHttpRequest.send(XMLHttpRequest.java:598)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at net.sourceforge.htmlunit.corejs.javascript.MemberBox.invoke(MemberBox.java:153)
at net.sourceforge.htmlunit.corejs.javascript.FunctionObject.call(FunctionObject.java:448)
at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpretLoop(Interpreter.java:1531)
at net.sourceforge.htmlunit.corejs.javascript.Interpreter.interpret(Interpreter.java:798)
at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.call(InterpretedFunction.java:105)
at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.doTopCall(ContextFactory.java:411)
at com.gargoylesoftware.htmlunit.javascript.HtmlUnitContextFactory.doTopCall(HtmlUnitContextFactory.java:309)
at net.sourceforge.htmlunit.corejs.javascript.ScriptRuntime.doTopCall(ScriptRuntime.java:3057)
at net.sourceforge.htmlunit.corejs.javascript.InterpretedFunction.exec(InterpretedFunction.java:115)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$3.doRun(JavaScriptEngine.java:724)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:832)
at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:620)
at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:513)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:733)
at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:708)
at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScriptIfPossible(HtmlPage.java:982)
at com.gargoylesoftware.htmlunit.html.HtmlScript.executeInlineScriptIfNeeded(HtmlScript.java:351)
at com.gargoylesoftware.htmlunit.html.HtmlScript.executeScriptIfNeeded(HtmlScript.java:411)
at com.gargoylesoftware.htmlunit.html.HtmlScript$3.execute(HtmlScript.java:276)
at com.gargoylesoftware.htmlunit.html.HtmlScript.onAllChildrenAddedToPage(HtmlScript.java:290)
at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.endElement(HTMLParser.java:793)
at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)
at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.endElement(HTMLParser.java:751)
at org.cyberneko.html.HTMLTagBalancer.callEndElement(HTMLTagBalancer.java:1170)
at org.cyberneko.html.HTMLTagBalancer.endElement(HTMLTagBalancer.java:1072)
at org.cyberneko.html.filters.DefaultFilter.endElement(DefaultFilter.java:206)
at org.cyberneko.html.filters.NamespaceBinder.endElement(NamespaceBinder.java:330)
at org.cyberneko.html.HTMLScanner$ContentScanner.scanEndElement(HTMLScanner.java:3126)
at org.cyberneko.html.HTMLScanner$ContentScanner.scan(HTMLScanner.java:2093)
at org.cyberneko.html.HTMLScanner.scanDocument(HTMLScanner.java:920)
at org.cyberneko.html.HTMLConfiguration.parse(HTMLConfiguration.java:499)
at org.cyberneko.html.HTMLConfiguration.parse(HTMLConfiguration.java:452)
at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
at com.gargoylesoftware.htmlunit.html.HTMLParser$HtmlUnitDOMBuilder.parse(HTMLParser.java:1017)
at com.gargoylesoftware.htmlunit.html.HTMLParser.parse(HTMLParser.java:248)
at com.gargoylesoftware.htmlunit.html.HTMLParser.parseHtml(HTMLParser.java:194)
at com.gargoylesoftware.htmlunit.DefaultPageCreator.createHtmlPage(DefaultPageCreator.java:268)
at com.gargoylesoftware.htmlunit.DefaultPageCreator.createPage(DefaultPageCreator.java:156)
at com.gargoylesoftware.htmlunit.WebClient.loadWebResponseInto(WebClient.java:471)
at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:345)
at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:410)
at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:395)
at com.aduan.study.test.web.crawler.HtmlUnitTest.testExecScript(HtmlUnitTest.java:186)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
at org.junit.runner.JUnitCore.run(JUnitCore.java:160)
at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:78)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:212)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:68)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:140)

2 个答案:

答案 0 :(得分：0)

如果没有

的result.html 
cd $HOME; nohup sh child.sh &

或在login.html中添加body标记

<head>
    <meta http-equiv="Content-Type" content="text/html; charset=GBK"/>
    <title>login</title> 
</head>

将会成功。谁能告诉我为什么？

result.html javascript add 

<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=GBK" /> 
</head>
<body>
<script>
function getContent(){ 
    var url= "result.html"; 
    var xhr=new (window.XMLHttpRequest||window.ActiveXObject)("Microsoft.XMLHTTP");
    xhr.onreadystatechange = function() { 
        if (xhr.readyState == 4 && xhr.status == 200) {
            document.write(xhr.responseText); 
            document.close(); 
        }
    }; 
    xhr.open("GET",url,false); xhr.send(); 
}
getContent(); 
</script>
</body>
</html>

输出中：

d.write("d:" + d + "<br/>");
d.write("b:" + b + "<br/>");

答案 1 :(得分：0)

使用WebConnectionWrapper添加insert标签可以解决问题。

client.setWebConnection(
        new WebConnectionWrapper(client) {
            public WebResponse getResponse(WebRequest request) throws IOException {
                WebResponse response = super.getResponse(request);
                String content = response.getContentAsString("UTF-8");
                if(content != null) {
                    if(!content.contains("<body>") && content.contains("</head>")) {
                        content = content.replace("</head>", "</head>\n<body>");
                        if(!content.contains("</body>") && content.contains("</html>")) {
                            content = content.replace("</html>", "</body>\n</html>");
                        }
                    }
                }
                logger.info("response: {}", content);
                WebResponseData data = new WebResponseData(content.getBytes("UTF-8"),
                        response.getStatusCode(), response.getStatusMessage(), response.getResponseHeaders());
                response = new WebResponse(data, request, response.getLoadTime());
                return response;
            }
        });
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