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getQueryString()方法

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#1 Created at ... [Delete] [Delete and Lock User] 
	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		resp.setContentType("text/html");
		PrintWriter pw = resp.getWriter();
		if("name=Bob".equals(req.getQueryString())) {
			pw.write("<h1>Hello, Bob!</h1>");
		}else {
		pw.write("<h1>Hello, world!</h1>");
		}
		pw.flush();
	}
}

这边才回顾起老师以前讲的一些知识的作用：

1. 字符串不要用`==` 比较

2. 变量可能为null不要放在equals前面会报错

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