JavaWeb-----ServletRequest、ServletResponse和HttpServletRequest、HttpServletResponse
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内容图文
JSP页面
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="${pageContext.request.contextPath}/login" method="post">
<span>用户名：</span><input type="text" name="userName"> <span>密码：</span><input
type="text" name="userPwd"> <input type="submit" value="提交">
</form>
</body>
</html>
Web.xml配置
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
id="WebApp_ID" version="3.1">
<display-name>JspAndServlet</display-name>
<welcome-file-list>
<welcome-file>login.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>loginServlet</servlet-name>
<servlet-class>com.servlet.LoginServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>loginServlet</servlet-name>
<url-pattern>/login</url-pattern>
</servlet-mapping>
</web-app>
1. ServletRequest、ServletResponse
Servlet类实现Servlet接口
- ServletRequest: 封装了请求信息. 可以从中获取到任何的请求信息
- ServletResponse: 封装了响应信息, 如果想给用户什么响应, 具体可以使用该接口的方法实现
package com.servlet;
import java.io.IOException;
import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* 实现Servlet接口
*
* @author yyx 2019年9月1日
*/
public class LoginServlet implements Servlet {
@Override
public void service(ServletRequest servletRequest, ServletResponse servletResponse)
throws ServletException, IOException {
// servletRequest需要强制转换成HttpServletRequest才能获取Http相关信息
HttpServletRequest req = (HttpServletRequest) servletRequest;
String userName = req.getParameter("userName");
String userPwd = req.getParameter("userPwd");
System.out.println(userName + " " + userPwd);
String requestURI = req.getRequestURI();
System.out.println(requestURI);
String method = req.getMethod();
System.out.println(method);
String queryString = req.getQueryString();
System.out.println(queryString);
String servletPath = req.getServletPath();
System.out.println(servletPath);
// 设置响应的内容类型
HttpServletResponse resp = (HttpServletResponse) servletResponse;
resp.setCharacterEncoding("UTF-8");
}
@Override
public void destroy() {
}
@Override
public ServletConfig getServletConfig() {
return null;
}
@Override
public String getServletInfo() {
return null;
}
@Override
public void init(ServletConfig arg0) throws ServletException {
}
}
2. HttpServletRequest、HttpServletResponse
Servlet类实现继承HttpServlet
- HttpServletRequest继承自ServletRequest
- HttpServletResponse继承自ServletResponse
package com.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* 继承HttpServlet类
* @author yyx 2019年9月1日
*/
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
String userName=req.getParameter("userName");
String userPwd=req.getParameter("userPwd");
System.out.println(userName+" "+userPwd);
String requestURI = req.getRequestURI();
System.out.println(requestURI);
String method = req.getMethod();
System.out.println(method);
String queryString = req.getQueryString();
System.out.println(queryString);
String servletPath = req.getServletPath();
System.out.println(servletPath);
//设置响应的内容类型
resp.setCharacterEncoding("UTF-8");
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
doGet(req, resp);
}
}
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