Struts2 getOutputStream() has already been called for this response 错误

最新推荐文章于 2021-05-06 10:33:24 发布

Eason_hoo

最新推荐文章于 2021-05-06 10:33:24 发布

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分类专栏： JavaEE

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Struts2 报出 getOutputStream() has already been called for this response 错误，因为我们设置了返回值，应该设置为空因为ServletActionContext.getResponse().getOutputStream(); 中Response已经是action 的内置对象了！！

/**
	 * 套餐统计表柱状图
	 * @return
	 */
	public String DrawPackBar(){
		DefaultCategoryDataset dp = new DefaultCategoryDataset();
		int VIP = packService.countPackbyName("VIP");
		int phone = packService.countPackbyName("电话");
		int sms = packService.countPackbyName("短信");
		int data = packService.countPackbyName("流量");
		int erre = packService.countPackbyName("0");
		dp.addValue(VIP, "", "VIP套餐");
		dp.addValue(phone, "", "电话套餐");
		dp.addValue(sms, "", "电话套餐");
		dp.addValue(data, "", "流量套餐");
		dp.addValue(erre, "", "0套餐");
		JFreeChart chart = ChartServer.DrawBar(dp);
				try {
					ServletOutputStream writer  = ServletActionContext.getResponse().getOutputStream();
					ChartUtilities.writeChartAsJPEG(writer, chart, 800, 600);
				} catch (IOException e) {
					e.printStackTrace();
				}
		return null;//<span style="color:#ff0000;">response 已经是action 的内置对象了</span>
	}