java - 为什么 getBuffer() 会出现错误？

Question

为什么我收到这些代码的错误消息:

TransformerFactory tf = TransformerFactory.newInstance();
Transformer t = tf.newTransformer();
DOMSource source = new DOMSource(doc);
Writer outWriter = new StringWriter();
StreamResult result = new StreamResult( outWriter );
t.transform(source, result);
StringBuffer sb = outWriter .getBuffer();     //with this line,complet error message down
return sb.toString();

        } catch (Exception e) {
            System.out.println(e.getMessage());
        }
        return null;

    }

**down: "StringBuffer sb = outWriter .getBuffer(); 
  symbol:   method getBuffer()
  location: variable outWriter of type Writer

注意:C:\Users\Desktop\BikeShop FINALE\src\bikeshop\orej.java 使用未经检查或不安全的操作。 注意:使用 -Xlint:unchecked 重新编译以了解详细信息。 1 个错误“**

有人知道为什么吗？

Answer 1

getBuffer 方法未为 java.io.Writer 定义。声明为 StringWriter:

StringWriter outWriter = new StringWriter();