JAVA web错误-获取Cookie报错An invalid character [32] was present in the Cookie value

问题描述：在响应中添加cookie的过程当中出现如下异常

java.lang.IllegalArgumentException: An invalid character [32] was present in the Cookie value
	org.apache.tomcat.util.http.Rfc6265CookieProcessor.validateCookieValue(Rfc6265CookieProcessor.java:182)
	org.apache.tomcat.util.http.Rfc6265CookieProcessor.generateHeader(Rfc6265CookieProcessor.java:115)
	org.apache.catalina.connector.Response.generateCookieString(Response.java:1010)
	org.apache.catalina.connector.Response.addCookie(Response.java:962)
	org.apache.catalina.connector.ResponseFacade.addCookie(ResponseFacade.java:385)
	org.apache.jsp.deal_jsp._jspService(deal_jsp.java:126)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:443)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:385)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:329)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)

代码以下所示：

Cookie cookie1 = new Cookie("username", m.replaceAll("").trim());
cookie1.setPath("/");
cookie1.setMaxAge(60 * 60 * 3);
resp.addCookie(cookie1);
req.getRequestDispatcher("/loginsuccess.jsp").forward(req, resp);

因为我是在尝试sql注入，因此输入的内容包含特殊字符，我觉得是特殊字符惹的祸，而后我就用正则去除了特殊字符，可是依然报这个错误，在网上查找资料的过程当中看到说是空格的影响，因此去除了空格。

Cookie cookie1 = new Cookie("username", m.replaceAll("").replace(" ",""));
cookie1.setPath("/");
cookie1.setMaxAge(60 * 60 * 3);
resp.addCookie(cookie1);
req.getRequestDispatcher("/loginsuccess.jsp").forward(req, resp);

而后，就没有报错啦~

参考连接：https://blog.csdn.net/allan_liu_/article/details/74990162