Question

所以，我有一个XHTML文档报告框架，我希望通过获取某些ID的元素并设置其内容来填充。

我尝试了getElementById（），并返回null（因为，我发现，id不是隐式“id”，需要在模式中声明）。

panel.setDocument(Main.class.getResource("/halreportview/DefaultSiteDetails.html").toString());
panel = populateDefaultReport(panel);

Element header1 = panel.getDocument().getElementById("header1");
header1.setTextContent("<span class=\"b\">Instruction Type:</span> Example<br/><span class=\"b\">Allocated To:</span> "+employee.toString()+"<br/><span class=\"b\">Scheduled Date:</span> "+dateFormat.format(scheduledDate));

所以，我尝试了一些解决方法，因为我不想验证我的XHTML文档。我尝试将快速DTD添加到相关文件的顶部，如此;

<?xml version="1.0"?>
<!DOCTYPE foo [<!ATTLIST bar id ID #IMPLIED>]>

但是getElementById（）仍然返回null。所以尝试在XHTML文档中使用xml:id代替id，希望它得到支持，但再次没有运气。所以我尝试使用getElementsByTagName（）并遍历结果检查ID。这工作，并找到正确的元素（由输出打印“发现它”确认），但当我尝试在此元素上调用setTextContent时，我仍然得到一个NullPointException。代码如下;

    Element header1;
    NodeList sections = panel.getDocument().getElementsByTagName("p");
    for (int i = 0; i < sections.getLength(); ++i) {
         if (((Element)sections.item(i)).getAttribute("id").equals("header1")) {
            System.out.println("Found it");
            header1 = (Element) sections.item(i);
            header1.setTextContent("<span class=\"b\">Instruction Type:</span> Example<br/><span class=\"b\">Allocated To:</span> "+employee.toString()+"<br/><span class=\"b\">Scheduled Date:</span> "+dateFormat.format(scheduledDate));
        }
    }

我对这个问题感到失望。我必须遭受某种根本的误解，认为这应该如何发挥作用。有什么想法吗？

编辑;下面摘录了我的XHTML文件，删除了CSS。

<html>
<head>
    <title>Site Details</title>
    <style type="text/css">
    </style>
</head>
<body>
    <div class="header">
        <p></p>
        <img src="#" alt="Logo" height="81" width="69"/>
        <p id="header1"><span class="b">Instruction Type:</span> Example<br/><span class="b">Allocated To:</span> Example<br/><span class="b">Scheduled Date:</span> Example</p> 
    </div>
</body>
</html>

Answer 1

我不确定为什么它不起作用，但我已经为你做了一个例子，它有效！

注意：我的示例使用以下库

Apache Commons IO（Link）
Jsoup HTML Parser（Jsoup link)
Apache Commons Lang（Link）

我的输入xhtml文件，

<html>
<head>
<title>Site Details</title>
<style type="text/css">
</style>
</head>
<body>
    <div class="header">
        <p></p>
        <img src="#" alt="Logo" height="81" width="69" />
        <p id="header1">
            <span class="b">Instruction Type:</span> Example<br />
            <span class="b">Allocated To:</span> Example<br />
            <span class="b">Scheduled Date:</span> Example
        </p>
    </div>
</body>
</html>

有效的java代码！ [所有评论，阅读]

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Date;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.StringEscapeUtils;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;

public class Test {

    /**
     * @param args
     * @throws IOException
     * @throws InterruptedException
     */
    public static void main(String[] args) throws IOException, InterruptedException {
        //loading file from project
        //When it is exported as JAR the files inside jar are not files but they are stream
        InputStream stream = Test.class.getResourceAsStream("/test.xhtml");

        //convert stream to file
        File xhtmlfile = File.createTempFile("xhtmlFile", ".tmp");
        FileOutputStream fileOutputStream = new FileOutputStream(xhtmlfile);
        IOUtils.copy(stream, fileOutputStream);
        xhtmlfile.deleteOnExit();

        //get html string from file
        String htmlString = FileUtils.readFileToString(xhtmlfile);

        //parse using jsoup
        Document doc = Jsoup.parse(htmlString);

        //get all elements
        Elements allElements = doc.getAllElements();


        for (Element el : allElements) {
            //if element id is header 1
            if (el.id().equals("header1")) {

                //dummy emp name
                String employeeName = "dummyEmployee";
                //update text
                el.text("<span class=\"b\">Instruction Type:</span> Example<br/><span class=\"b\">Allocated To:</span> "
                        + employeeName.toString() + "<br/><span class=\"b\">Scheduled Date:</span> " + new Date());
                //dont loop further
                break;
            }
        }

        //now get html from the updated document
        String html = doc.html();

        //we need to unscape html 
        String escapeHtml4 = StringEscapeUtils.unescapeHtml4(html);

        //print html 
        System.out.println(escapeHtml4);

    }

}

* 输出*

<html>
 <head> 
  <title>Site Details</title> 
  <style type="text/css">
</style> 
 </head> 
 <body> 
  <div class="header"> 
   <p></p> 
   <img src="#" alt="Logo" height="81" width="69" /> 
   <p id="header1"><span class="b">Instruction Type:</span> Example<br/><span class="b">Allocated To:</span> dummyEmployee<br/><span class="b">Scheduled Date:</span> Sat Nov 02 07:37:12 GMT 2013</p> 
  </div>  
 </body>
</html>

Java getElementById（）或Alternative

1 个答案: