将文件(XML文件)写入字符串/内存
下面的方法可以将一个文件中的所有内容写入一个字符串中
public String file2String() throws TransformerException, IOException {BufferedReader br = new BufferedReader(new FileReader("C://4test//test.xml"));Writer writer = new StringWriter();String str = "";while ((str = br.readLine()) != null) {writer.write(str + "\n");writer.flush();}String reValue = writer.toString();System.out.println(reValue);return reValue;}