Cookie保存中文用户名报错（500）

在用Cookie保存用户名时候，当用户名是中文的时候服务器报错了。

HTTP Status 500 - An exception occurred processing JSP page /dologin.jsp at line 40

---

type Exception report

message An exception occurred processing JSP page /dologin.jsp at line 40

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 /dologin.jsp at line 40

37:     		Cookie passwordCookie = new Cookie("password",password);
38: 	 		usernameCookie.setMaxAge(86400);
39:     		passwordCookie.setMaxAge(86400);
40:     		response.addCookie(usernameCookie);
41:     		response.addCookie(passwordCookie);
42:     	}else
43:     	{

Stacktrace:
	org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:568)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:470)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

root cause

java.lang.IllegalArgumentException: Control character in cookie value or attribute.
	org.apache.tomcat.util.http.CookieSupport.isHttpSeparator(CookieSupport.java:193)
	org.apache.tomcat.util.http.CookieSupport.isHttpToken(CookieSupport.java:217)
	org.apache.tomcat.util.http.ServerCookie.appendCookieValue(ServerCookie.java:186)
	org.apache.catalina.connector.Response.generateCookieString(Response.java:1070)
	org.apache.catalina.connector.Response.addCookie(Response.java:1012)
	org.apache.catalina.connector.ResponseFacade.addCookie(ResponseFacade.java:380)
	org.apache.jsp.dologin_jsp._jspService(dologin_jsp.java:107)
	org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
	org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
	org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:395)
	org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

note The full stack trace of the root cause is available in the Apache Tomcat/7.0.56 logs.

------------------------------------------------------------------------------分割线------------------------------------------------------------------------------

这里设置request.setCharacterEncoding("utf-8");也改变不了报错

解决方法：Java网络包里面编码和解码的工具类(URLEncoder)

原来的代码

String username = request.getParameter("username");
String password = request.getParameter("password");
Cookie usernameCookie = new Cookie("username",username);
Cookie passwordCookie = new Cookie("password",password);
usernameCookie.setMaxAge(86400);
passwordCookie.setMaxAge(86400);
response.addCookie(usernameCookie);
response.addCookie(passwordCookie);

修改代码

用URLEncoder.encode解决无法在Cookie当中保存中文字符串的问题

String username = URLEncoder.encode(request.getParameter("username"),"utf-8") ;
String password = URLEncoder.encode(request.getParameter("password"),"utf-8");
Cookie usernameCookie = new Cookie("username",username);
Cookie passwordCookie = new Cookie("password",password);
usernameCookie.setMaxAge(86400);
passwordCookie.setMaxAge(86400);
response.addCookie(usernameCookie);
response.addCookie(passwordCookie);

然后还要解码

URLDecoder.decode

注意: 编码解码分别在java.net.URLDecoder 和 java.net.URLEncoder下。记得导入类