getOutputStream()和getWriter()不能同时用

getOutputStream 和 getWriter方法不能同时共用，具体原因不详。估计是不能同时有两个输出流，不然电脑就爆炸了。

 

-------JAVA DOCS---------------------------------------------------

 

getOutputStream

public ServletOutputStream getOutputStream()   throws java.io.IOException
Returns a ServletOutputStream suitable for writing binary data in the response. The servlet container does not encode the binary data.
Calling flush() on the ServletOutputStream commits the response. Either this method or getWriter() may be called to write the body, not both.

Returns:
a ServletOutputStream for writing binary data
Throws:
java.lang.IllegalStateException - if the getWriter method has been called on this response
java.io.IOException - if an input or output exception occurred
See Also:
getWriter()

getWriter

public java.io.PrintWriter getWriter() throws java.io.IOException
Returns a PrintWriter object that can send character text to the client. The character encoding used is the one specified in the charset= property of the setContentType(java.lang.String) method, which must be called before calling this method for the charset to take effect.
If necessary, the MIME type of the response is modified to reflect the character encoding used.
Calling flush() on the PrintWriter commits the response.
Either this method or getOutputStream() may be called to write the body, not both.

Returns:
a PrintWriter object that can return character data to the client
Throws:
java.io.UnsupportedEncodingException - if the charset specified in setContentType cannot be used
java.lang.IllegalStateException - if the getOutputStream method has already been called for this response object
java.io.IOException - if an input or output exception occurred
See Also:
getOutputStream(), setContentType(java.lang.String)

 

评论

1 楼 strangeromo 2009-12-01  

引用

getOutputStream 和 getWriter方法不能同时共用，具体原因不详。估计是不能同时有两个输出流，不然电脑就爆炸了。

我猜也是两个输出流的原因，这样就没法判断到底是使用哪个输出流作为结果了。
ps，爆炸的应该是服务器吧？