JAVA web錯誤-獲取Cookie報錯An invalid character [32] was present in the Cookie value

問題描述：在響應中添加cookie的過程當中出現如下異常

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)

代碼以下所示：

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);

因爲我是在嘗試sql注入，因此輸入的內容包含特殊字符，我覺得是特殊字符惹的禍，而後我就用正則去除了特殊字符，可是依然報這個錯誤，在網上查找資料的過程當中看到說是空格的影響，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);

而後，就沒有報錯啦~

參考連接：https://blog.csdn.net/allan_liu_/article/details/74990162