struts2中getOutputStream() has already been called for this response异常解决方法
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struts2写了个生成随机验证码的Action类，将生成的验证码图片输出到jsp页面，浏览器能够正常显示验证码图片，但是后台抛出了如下异常：
getOutputStream() has already been called for this response
网上搜了下，如果代码在jsp上，有解决办法，利用了jsp内置对象out的一些方法。
但是代码在action中，无法使用jsp内置对象，上面方法也就无效了。
那么代码在action中的解决办法是：正常action中执行方法都会返回一个字符串，我们把返回值返回为null就后台就不会报错了。原理不明。。。
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