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getOutputStream() has already been called for this

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tomcat5下jsp出现getOutputStream() has already been called for this response异常的原因和解决方法
【标  题】:tomcat5下jsp出现getOutputStream() has already been called for this response异常的原因和解决方法
【关键字】:tomcat5,jsp,getOutputStream,has,already,been,called,for,this,response
【来  源】:http://blog.csdn.net/alexwan/archive/2007/02/13/1508871.aspx

tomcat5下jsp出现getOutputStream() has already been called for this response异常的原因和解决方法

在tomcat5下jsp中出现此错误一般都是在jsp中使用了输出流(如输出图片验证码,文件下载等),
没有妥善处理好的原因。

具体的原因就是
在tomcat中jsp编译成servlet之后在函数_jspService(HttpServletRequest request, HttpServletResponse response)的最后
有一段这样的代码
finally {
      if (_jspxFactory != null) _jspxFactory.releasePageContext(_jspx_page_context);
    }
这里是在释放在jsp中使用的对象,会调用response.getWriter(),因为这个方法是和
response.getOutputStream()相冲突的!所以会出现以上这个异常。

然后当然是要提出解决的办法,其实挺简单的(并不是和某些朋友说的那样--
将jsp内的所有空格和回车符号所有都删除掉),

在使用完输出流以后调用以下两行代码即可:
out.clear();
out = pageContext.pushBody();
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