Controller接受请求参数的常见方法:
1、通过Bean接受请求参数:
创建POJO实体类
创建pojo包,并在该包中创建实体类UserForm,代码:
packagepojo;
publicclassUserForm{
privateString uname;//与请求参数名称相同
private String upass;
private String reupass;
public String getUname() {
return uname;
}
public void setUname(String uname) {
this.uname = uname;
}
public String getUpass() {
return upass;
}
public void setUpass(String upass) {
this.upass = upass;
}
public String getReupass() {
return reupass;
}
public void setReupass(String reupass) {
this.reupass = reupass;
}
}
创建控制器类,在controller包中创建控制器类IndexController和UserController
其中@RequestMapping注解的作用个人浅显的理解就是将方法或类注解为一个“路径”的名称,以便在HTML,JSP(视图)向控制器发送请求时寻找到。
IndexController代码:
packagecontroller;
import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;@Controller//在这里@Controller相当于@Controller(“indexController”)@RequestMapping("/index")
public class IndexController { @RequestMapping("/login")
public String login() {return"login";//跳转到“/WEB-INF/jsp/login.jsp”
} @RequestMapping("/register")
public String register() {return"register";
}}
UserController代码:
packagecontroller;
import javax.servlet.http.HttpSession;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.web.bind.annotation.ModelAttribute;import org.springframework.web.bind.annotation.RequestMapping;import pojo.UserForm;import service.UserService;@Controller//在这里@Controller相当于@Controller(“userController”)@RequestMapping("/user")
public class UserController {//得到一个用来记录日志的对象,这样打印信息的时候能够标记打印的是那个类的信息
private static final Log logger = LogFactory.getLog(UserController.class);//将服务依赖注入到属性userService
@Autowired public UserService userService;/**
* 处理登录
*/
@RequestMapping("/login")
public String login(UserForm user, HttpSession session, Model model) {if(userService.login(user)){
session.setAttribute("u", user);
logger.info("成功");
return"main";//登录成功,跳转到main.jsp
}else{
logger.info("失败");
model.addAttribute("messageError","用户名或密码错误");
return"login";
} } /** *处理注册 */
@RequestMapping("/register")
public String register(@ModelAttribute("user") UserForm user) {
if(userService.register(user)){
logger.info("成功");
return "login";//注册成功,跳转到login.jsp
}else{
logger.info("失败");
//使用@ModelAttribute("user")与model.addAttribute("user", user)功能相同
//在register.jsp页面上可以使用EL表达式${user.uname}取出ModelAttribute的uname值
return "register";//返回register.jsp
}
}
}
创建页面视图,结合视图中更能理解@RequestMapping注解的作用,其中关于本次知识的核心代码为<body>标签中的内容:
创建register.jsp代码:
<%@pagelanguage="java"contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%>
.textSize{
width:100pt;
height:15pt
}
注册画面
//注册时检查输入项
function allIsNull(){
var name=document.registForm.uname.value;
var pwd=document.registForm.upass.value;
var repwd=document.registForm.reupass.value;
if(name==""){
alert("请输入姓名!");
document.registForm.uname.focus();
return false;
}
if(pwd==""){
alert("请输入密码!");
document.registForm.upass.focus();
return false;
}
if(repwd==""){
alert("请输入确认密码!");
document.registForm.reupass.focus();
return false;
}
if(pwd!=repwd){
alert("2次密码不一致,请重新输入!");
document.registForm.upass.value="";
document.registForm.reupass.value="";
document.registForm.upass.focus();
return false;
}
document.registForm.submit();
return true;
}
border=1
bgcolor="lightblue"
align="center">
姓名:
密码:
确认密码:
创建login.jsp代码:
<%@pagelanguage="java"contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%>
后台登录
table{
text-align: center;
}
.textSize{
width:120px;
height:25px;
}
* {
margin:0px;
padding:0px;
}
body{
font-family: Arial, Helvetica, sans-serif;
font-size:12px;
margin:10px10pxauto;
background-image:url(${pageContext.request.contextPath }/images/bb.jpg);
}
//确定按钮
function gogo(){
document.forms[0].submit();
}
//取消按钮
function cancel(){
document.forms[0].action = "";
}
姓名:
密码:
${messageError }
2、通过处理方法的形参接收请求参数
即将控制类UserConttroller中的register方法的代码修改如下:
@RequestMapping("/register")
/**
*通过形参的计收请求参数,形参名称与请求参数名称完全相同
*/
publicStringregister(Stringuname,Stringupass,Model model) {
if(userService.equals(uname)&&userService.equals(upass)){
logger.info("成功");
return"login";//注册成功,跳转到login.jsp
}else{
logger.info("失败");
return "register";//返回register.jsp
}
}
3、通过HttpServetRequest接受请求参数(推荐使用):
即将控制类UserConttroller中的register方法的代码修改如下:
@RequestMapping("/register")
public String register(HttpServletRequest request,Model model) { String uname = request.getParameter("uname");
String upass = request.getParameter("upass");
if(userService.equals(uname)&&userService.equals(upass)){
logger.info("成功");
return"login";//注册成功,跳转到login.jsp
}else{
logger.info("失败");
return"register";//返回register.jsp
} }
其他@PathVariable、@RequestParam等不多赘述,原理相同。
作者:阿波罗的手
链接:https://www.cnblogs.com/linchenguang/p/11243444.html
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