文章目录
一丶 request 对象二丶 request 对象获取数据的常用方法:三丶 中文乱码问题一丶 request 对象
request 对象中保存了用户请求的数据,通过调用相关方法就可以实现请求数据的读取
二丶 request 对象获取数据的常用方法:
getParameter(String name)
返回指定名称参数的值,返回值类型为 String 类型,若无对应名称的参数,返回NULL。
getParameterValues(String name)
返回一组具有相同名称的参数值,返回类型为 String 类型的数组
setCharacterEncoding(“UTF-8”)
设置请求的编码方式
效果图:
index.jsp:
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><base href="<%=basePath%>"><title>My JSP 'index.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--></head><body>//action 点击事件后跳转的链接,method 采用 get 请求方式<form action="loginSuccess.jsp" method="get">用户名:<input type="text" name="username" value="">密 码:<input type="text" name="password" value=""><button type="submit">提交</button></form></body></html>
loginSuccess.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><base href="<%=basePath%>"><title>My JSP 'loginSuccess.jsp' starting page</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--></head><body><%String username=request.getParameter("username");//读取用户名String password = request.getParameter("password");//读取密码并输出out.print("用户名:"+username+"</br>");out.print("密码:"+password+"</br>");%></body></html>
三丶 中文乱码问题
【1】POST 请求
设置请求的编码方式:
request.setCharacterEncoding(“UTF-8”);
设置响应的编码方式:
request.setCharacterEncoding(“UTF-8”);
如果在 JSP 中已经对 page 指令中的 contentType 中的 charset 设置了编码方式为 UTF-8的化,则该句可以省略
【2】GET 请求
new String(s.getBytes(“ISO-8859-1”),“UTF-8”);