getParameterMap()返回参数需要对应实体类类型，否则收不到----打卡
getParameterMap()返回参数需要对应实体类类型，否则收不到----打卡
呱
发布于 2020-10-23 10:39:42
发布于 2020-10-23 10:39:42
1.在jsp页面传到controller许多参数，使用getParameterMap()获得
1.1register.jsp页面
<%--
Created by IntelliJ IDEA.
User: 49841
Date: 2020/9/18
Time: 11:49
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>注册页面</title>
</head>
<body>
<form method="post" action="usersController?method=register">
<input type="text" name="uname" placeholder="请输入你的用户名"/>
<input type="text" name="upassword" placeholder="请输入你的密码"/>
<input type="text" name="uemail" placeholder="请输入你的邮箱"/>
<input type="text" name="usex" placeholder="请输入你的性别"/>
<input type="submit" value="提交"/>
</form>
<%-- <span style="color:red">${msg}</span>--%>
</body>
</html>1.2.controller(Servlet),因为后面还写了BaseController，方法就没写在doget、dopost里面
//注册
public String register(HttpServletRequest request, HttpServletResponse response) throws Exception{
User user = new User();
//得到参数并封装到user,并为其中为null的属性赋值
BeanUtils.populate(user, request.getParameterMap());
user.setUstatus(SysConstant.NOT_ACTIVE);//激活状态为0
user.setUcode(ActiveCodeUtils.getActiveCode());
user.setUrole(SysConstant.CUSTOMER);
//添加进数据库-->邮箱-->（emailActivate）点击激活
int i = userService.register(user);
request.setAttribute("url",userService.getUrl());
//已经激活的状态
if(i>0){
//注册成功
return SysConstant.FORWARD+SysConstant.FLAG+"registerSuccess.jsp";
}else{
//注册失败
request.setAttribute("registerMsg", "注册失败");
return SysConstant.FORWARD+SysConstant.FLAG+"register.jsp";
}
}1.3User实体类
public class User {
private int uid;
private String uname;
private String upassword;
private String uemail;
private String usex;
private int ustatus;
private String ucode;
private int urole;
@Override
public String toString() {
return "User{" +
"uid=" + uid +
", uname='" + uname + '\'' +
", upassword='" + upassword + '\'' +
", uemail='" + uemail + '\'' +
", usex='" + usex + '\'' +
", ustatus=" + ustatus +
", ucode='" + ucode + '\'' +
", urole=" + urole +
'}';
}
public int getUid() {
return uid;
}
public void setUid(int uid) {
this.uid = uid;
}
public String getUname() {
return uname;
}
public void setUname(String uname) {
this.uname = uname;
}
public String getUpassword() {
return upassword;
}
public void setUpassword(String upassword) {
this.upassword = upassword;
}
public String getUemail() {
return uemail;
}
public void setUemail(String uemail) {
this.uemail = uemail;
}
public String getUsex() {
return usex;
}
public void setUsex(String usex) {
this.usex = usex;
}
public int getUstatus() {
return ustatus;
}
public void setUstatus(int ustatus) {
this.ustatus = ustatus;
}
public String getUcode() {
return ucode;
}
public void setUcode(String ucode) {
this.ucode = ucode;
}
public int getUrole() {
return urole;
}
public void setUrole(int urole) {
this.urole = urole;
}
}2.说明：
&nbus之前图方便，使用getParameterMap()加 BeanUtils.populate(),得到参数就直接封装到user对象里面了，没有使用request.setAttribute(),一个名一个值的这样一个个参数的获取，再new user放进去。
所有采坑了，因为jsp页面input标签里面名称和实体类定义的属性名不一样，所以获取不到值，最后得到了一个空的user对象。呱~
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原始发表：2020-09-19 ，如有侵权请联系 cloudcommunity@tencent.com 删除
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