使用struts2上载出错getOutputStream() has already been ca

2012-09-09

使用struts2下载出错getOutputStream() has already been ca报错: java.lang.IllegalStateException: getO

使用struts2下载出错getOutputStream() has already been ca
报错: java.lang.IllegalStateException: getOutputStream() has already been called for this response的错误. Struts方法之间调用引起的。
因为：每个方法都返回的是一个ActionForward对象，而response是ActionForward对象参数，所以就会使response冲突！故,将最后的return "SUCCESS"改为 return null .不将其交由sturts管理.
如：

/** * 查看图片 * @return * @throws Exception */public String view() throws Exception {    png= workFlowManager.getPngByte(workFlow.getPdID());response.reset();response.setContentType("image/png");response.getOutputStream().write(png.getFileData());response.getOutputStream().flush();response.getOutputStream().close();return null;}

调用页面

<a href="#" onclick="openWin('workFlow!view?workFlow.pdID=<s:property value="#wf.pdID" />','updateorg',700,500);">查看定义图</a>

显示页面

<img src="'workFlow!view?workFlow.pdID=<s:property value="#wf.pdID" />" style="position:absolute;left:0px;top:0px;">

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使用struts2上载出错getOutputStream() has already been ca