一、内置对象介绍

内置对象在JSP生成的.Java代码中(_jspService)的内部.

二、内置对象方法

String value = request.getParameter("key");// 获取请求携带的参数信息
request.setCharacterEncoding("UTF-8");// 设置接受请求参数时的字符集(POST请求)
request.setAttribute("key",Object);// 存值
Object = request.getAttribute("key");// 取值
RequestDispatcher rd= request.getRequestDispatcher("path");// 设置转发的资源位置
rd.forward(request,response);
Enumeration en = request.getParameterNames();
while(en.hasMoreElements()){
    String key = (String)en.nextElement();
    String value = request.getParameter(key);
}
String[] values = request.getParameterValues("key");// 获取key一致的一组value值(复选框)
for(String value:values){
}
StringBuffer buffer = request.getRequestURL();
String value = request.getRequestURI();
request.getHeader();
HttpSession = request.getSession();

response.setCharacterEncoding("UTF-8");
PrintWriter pw = response.getWriter();// 获取
pw.write();
int statusNumber = response.getStatus();
response.setStatus();// 设置状态响应码
response.addCookie();// 添加cookie
new Cookie("key","value");//key不能为空，且长度不能为零
response.sendRedirect("path");

session.setAttribute("key","Object");
Object = session.getAttribute("key");
session.removeAttribute("key")
Enumeration en = session.getAttributeNames();
session.setMaxinactiveinterval();// 设置最大session不活跃时间(秒)
session.invalidate();//设置session对象失效时间
session.getid();

application.setAttribute();
application.getAttribute();
application.removeAttribute();
application.getAttributeNames();
application.getInitParameter();
application.getRequestDispatcher("").forward(request,response);
application.getRealPath("");

config.getInitParamter();
config.getInitParamterNames();
config.getServletName();
config.getServletContext();

isErrorPage="true";
errorPage=".jsp";