JSP Response addCookie 错误处理

1、错误堆栈：

java.lang.IllegalArgumentException: An invalid character [32] was present in the Cookie value

2、根本原因：cookie中不接受非法字符，非法字符，如堆栈中所述，[32],可以查询32对应的ASCII码，如此处是：空格。

3、解决方案：找到了根本原因，就要解决它。那么我们就要将Cookie中的非法字符去掉。如此处：可以考虑：

String str = " hello world ";
str.trim().replaceAll(" ","");

4、附：全部错误信息：

type Exception report

message An exception occurred processing JSP page /ResponseForCookie.jsp at line 37

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: An exception occurred processing JSP page /ResponseForCookie.jsp at line 37

34: }else{
35:     cookie_response = new Cookie(user_name+"_cookie_info",currenTime);
36: }
37: response.addCookie(cookie_response);
38: response.setContentType("text/html");
39: response.flushBuffer();
40:

Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:588)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:481)
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:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
root cause

java.lang.IllegalArgumentException: An invalid character [32] was present in the Cookie value
org.apache.tomcat.util.http.Rfc6265CookieProcessor.validateCookieValue(Rfc6265CookieProcessor.java:162)
org.apache.tomcat.util.http.Rfc6265CookieProcessor.generateHeader(Rfc6265CookieProcessor.java:111)
org.apache.catalina.connector.Response.generateCookieString(Response.java:989)
org.apache.catalina.connector.Response.addCookie(Response.java:937)
org.apache.catalina.connector.ResponseFacade.addCookie(ResponseFacade.java:384)
org.apache.jsp.ResponseForCookie_jsp._jspService(ResponseForCookie_jsp.java:154)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
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:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
note The full stack trace of the root cause is available in the Apache Tomcat/9.0.0.M15 logs.

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