將內容存儲在String變量而不是文件中

Question

我有一個XML轉換過程，其中將輸出的轉換XML寫入文件。 但是，我不想將其存儲在文件中，而是將其存儲在字符串變量中。 我已經創建了一個字符串變量，請告知如何將生成的XML存儲在字符串變量中（msgxml而不是編寫文件）。

String msgxml;  

System.setProperty("javax.xml.transform.TransformerFactory",
                "org.apache.xalan.processor.TransformerFactoryImpl"); 

FileInputStream xml = new FileInputStream(xmlInput);
FileInputStream xsl = new FileInputStream(xslInput);
FileOutputStream os = new FileOutputStream(outputXmlFile);

TransformerFactory tFactory = TransformerFactory.newInstance();
// Use the TransformerFactory to process the stylesheet source and produce a Transformer 
StreamSource styleSource = new StreamSource(xsl);
Transformer transformer = tFactory.newTransformer(styleSource);


StreamSource xmlSource = new StreamSource(xml);
StreamResult result = new StreamResult(os);

//here we are storing it in a file , 
try {
    transformer.transform(xmlSource, result);
} catch (TransformerException e) {
    e.printStackTrace();
} 

Answer 1

一種方法是使用ByteArrayOutputStream而不是FileOutputStream ：

ByteArrayOutputStream baos = new ByteArrayOutputStream();
TransformerFactory tFactory = TransformerFactory.newInstance();

...

StreamSource xmlSource = new StreamSource(xml);
StreamResult result = new StreamResult(baos);  // write to the byte array stream

//here we are storing it in a file , 
try {
    transformer.transform(xmlSource, result);
}
...

msgxml = baos.toString("UTF-8");  // get contents of stream using UTF-8 encoding

另一種解決方案是使用java.io.StringWriter ：

StringWriter stringWriter = new StringWriter();
StreamResult result = new StreamResult(stringWriter);

...

msgxml = stringWriter.toString();