Request_获取请求头数据：
获取请求头数据
方法：
1.(*)String getHeader(String name)：通过请求头的名称获取请求头的值
2.Enumeration<String> getHeaderNames()：获取所有的请求头名称
代码实现：
@WebServlet("/requestDemo1")
public class RequestDemo1 extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//演示获取请求头数据
//1、获取所有请求头名称
Enumeration<String> headerNames = request.getHeaderNames();
//2、遍历
while (headerNames.hasMoreElements()){
String name = headerNames.nextElement();
//根据名称获取请求头
String value = request.getHeader(name);
System.out.println(name+"-----"+value);
}
//获取请求头数据：user-agent
String header = request.getHeader("user-agent");
//判断header的浏览器版本
if(header.contains("Chrome")){
//谷歌
System.out.println("谷歌");
}else if (header.contains("Firofox")){
//火狐
System.out.println("火狐");
}
//演示获取请求头数据：referer
String referer = request.getHeader("referer");
System.out.println(referer);
//防盗链
if (referer!=null){
if (referer.contains("/")){
//正常访问
// System.out.println("播放");
response.setContentType("text/html;charset=utf-8");
response.getWriter().write("播放");
}else {
//盗链
System.out.println("去首页");
response.setContentType("text/html;charset=utf-8");
response.getWriter().write("播放");
}
}
}
}
login.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form action="/demo3" method="post">
<input name="username">
<input type="submit" value="提交">
</form>
<hr>
<a href="/requestDemo1">requestdemo1</a>
</body>
</html>
Request_获取请求体数据：
获取请求体数据：
请求体：只有POST请求方式，才有请求体，在请求体中封装了POST请求的请求参数
步骤：
1.获取流对象
BufferedReader getReader()：获取字符输入流，只能操作字符数据
ServletInputStream getInputSream()：获取字符输入流，可以操作所有类型的数据
1.在文件上传知识后讲解
代码实现：
@WebServlet(name = "RequestDemo5", value = "/RequestDemo5")
public class RequestDemo5 extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//获取请求消息体--请求参数
//1.获取字符流
BufferedReader br = request.getReader();
//2.读取数据
String line = null;
while ((line = br.readLine())!= null){
System.out.println(line);
}
}
}
regist.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form action="RequestDemo5" method="post">
<input type="text" placeholder="请输入用户名" name="username"><br>
<input type="text" placeholder="请输入密码" name="password"><br>
<input type="submit" value="注册">
</form>
</body>
</html>
标签：请求,Request,request,System,获取,println,response From： https://www.cnblogs.com/hungui/p/16988209.html