从Java写入XML文档 - 简单 [英] Writing from Java to an XML document - Simple

问题描述

我知道在stackoverflow上从Java写到XML有很多问题，但它太复杂了。我觉得我有一个非常简单的问题，我无法理解。

I know there's tons of questions on writing from Java to XML on stackoverflow, but it's all too complex. I feel I have a very simple problem that I just can't figure out.

所以我有一个程序需要大量的用户输入，我现在正在创建它并附上包含结果的文本文档。我将在这里发布我的编写器代码：

So I have a program that takes a bunch of user input and I have it currently creating and appending a text document with the results. I'll just post my writer code here:

 PrintWriter out = null;
         try {
             out = new PrintWriter(new BufferedWriter(new FileWriter("C:/Documents and Settings/blank/My Documents/test/test.txt", true)));
             out.println("");
             out.println("<event title=\""+titleFieldUI+"\"");
             out.println("  start=\""+monthLongUI+" "+dayLongUI+" "+yearLongUI+" 00:00:00 EST"+"\"");            
             out.println("  isDuration=\"true\"");
             out.println("  color=\""+sValue+"\"");
             out.println("  end=\""+monthLong1UI+" "+dayLong1UI+" "+yearLong1UI+" 00:00:00 EST"+"\"");
             out.println("  "+descriptionUI);
             out.println("");
             out.println("</event>");
             out.println("  <!-- Above event added by: " +System.getProperty("user.name")+" " +
                        "on: "+month+"/"+day+"/"+year+" -->");       
         }catch (IOException e) {
             System.err.println(e);
         }finally{
             if(out != null){
                 out.close();
             }
         } 

所以最后，我希望它写到一个已经存在的XML文件（我可以通过简单地改变我的编写器所在的位置来完成）。问题是，这个XML文件有一个根标记，称为< data> 。我需要将我的程序的结果放在XML文件的底部，但是要先到< / data> 。这是唯一的要求。我发现的一切看起来都太复杂了，我无法弄清楚..

So in the end, I want it to write to an already existing XML file (which I can do by simply changing where my writer goes to). Problem is, this XML file has ONE root tag known as <data>. I need the results of my program to go on the bottom of the XML file, but come BEFORE </data>. That's the only requirement. Everything I find seems too complex and I can't figure it out..

非常感谢任何帮助！

推荐答案

您应该使用一个不错的XML API。例如，以下是使用 JDOM 的示例：

You should use a decent XML API. For example, here's an example using JDOM:

import java.io.*;

import org.jdom2.*;
import org.jdom2.input.*;
import org.jdom2.output.*;

public class Test {
    public static void main(String args[]) throws IOException, JDOMException {
        File input = new File("input.xml"); 
        Document document = new SAXBuilder().build(input);
        Element element = new Element("event");
        element.setAttribute("title", "foo");
        // etc...
        document.getRootElement().addContent(element);

        // Java 7 try-with-resources statement; use a try/finally
        // block to close the output stream if you're not using Java 7
        try(OutputStream out = new FileOutputStream("output.xml")) {
            new XMLOutputter().output(document, out);
        }
    }
}

/ em>并不那么难......它会比手动写出更强大，更强大。 （例如，如果您的事件标题包含&，这将做正确的事情 - 而您的代码会产生无效的XML。）

It's really not that hard... and it'll be much, much more robust than writing it out manually. (For example, this will do the right thing if your event title contains "&" - whereas your code would have produced invalid XML.)

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