java - 为什么 getBuffer() 会出错？

Question

我有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 重新编译以获取详细信息。1 个错误"**

有人知道为什么吗？

Answer 1

该方法getBuffer未定义java.io.Writer。声明为StringWriter：

StringWriter outWriter = new StringWriter();