AJAX+JSP时，out.write('content')之后，如果后面还有代码，无法被执行到，会报 错，java.lang.IllegalStateException: Cannot call sendRedirect() after the response has been committed。

可以在out.write('content');这句代码后面加：return;令下面的代码sendRedirect不再执行。后台就不会报错了

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