一、笔记
1.
2.请求参数乱码问题
3.实现重定向的方式
二、撸代码
- 获取请求信息
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
//获取请求头的所有信息
Enumeration<String> en = request.getHeaderNames();
while(en.hasMoreElements())
{
String name = en.nextElement();
String value = request.getHeader(name);
response.getWriter().print(name+": "+value+"<br/>");
}
/**
//1.获取请求的方式
String method = request.getMethod();
System.out.println("请求方式为:"+method);
//2.获取请求的协议
String proto = request.getProtocol();
System.out.println("请求协议为:"+proto);
//3.获取项目路径
String contextPath = request.getContextPath();
System.out.println("项目路径为"+contextPath);
//4.获取servlet路径
String servletPath = request.getServletPath();
System.out.println("servlet路径为:"+servletPath);
//5.获取请求的路径
String URI = request.getRequestURI();
String URL = request.getRequestURL().toString();
System.out.println("URI:"+URI);
System.out.println("URL:"+URL);
**/
}
- 防盗链案例
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
/**
* 做一个防盗链案例,根据request请求头来做
*/
String referer = request.getHeader("Referer");
//获取服务器的名称
String serverName = request.getServerName();
response.setContentType("text/html;charset=UTF-8");
//判断是否是本网站发起的下载请求
if(referer != null && referer.contains(serverName))
{
response.getWriter().print("download……………………"+serverName);
}
else
{
response.sendRedirect("/servletPractice/download.html");
}
}
- doGet请求乱码
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// TODO Auto-generated method stub
String number = req.getParameter("number");
String newN = new String(number.getBytes("ISO8859-1"),"utf-8");
resp.getWriter().print("number: "+newN);
}
- doPost请求乱码
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// TODO Auto-generated method stub
//请求乱码问题
req.setCharacterEncoding("utf-8");
//响应中文乱码问题
resp.setContentType("text/html;charset=utf-8");
String number = req.getParameter("number");
System.out.println(number);
resp.getWriter().print("number: "+number);
}
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