处理表单
一、首先写一个表单
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h1>Register</h1>
<form method="post">
First Name: <input type="text" name="firstName"/><br/>
last Name: <input type="text" name="lastName"/><br/>
UserName: <input type="text" name="userName"/>
Password: <input type="text" name="password"/>
<input type="submit" value="register"/>
</form>
</body>
</html>
注意这里的 form 标签并没有设置 action 属性，这种情况下当表单提交时他会提交到与展现时相同的url路径上，即它会提交到 /spitter/register 上。 所以我们在该Controller中添加一个处理POST请求的 register 方法
二、然后编写对应的控制器
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import data.Repository;
import entity.Spittle;
@Controller
@RequestMapping("/spitter")
public class SpitterController {
private Repository repository;
@Autowired
public SpitterController(Repository repository) {
this.repository = repository;
}
@RequestMapping(value="/register", method=RequestMethod.GET)
public String showRegistrationForm() {
return "registerForm";
}
@RequestMapping(value="/register", method=RequestMethod.POST)
public String processRegistration(Spittle spittle) {
repository.save(spittle);
return "redirect:/spitter/" + spittle.getUserName();
}
@RequestMapping(value="/{userName}", method=RequestMethod.GET)
public String redirectPage(@PathVariable String userName, Model model) {
System.out.println("6666666666666");
Spittle spittle = repository.findByUserName(userName);
model.addAttribute(spittle);
return "profile";
}
}
profile.jsp 页面
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h1>Your Profile</h1>
<c:out value="${spitter.username}"/><br/>
<c:out value="${spitter.username}"/><br/>
<c:out value="${spitter.username}"/><br/>
</body>
</html>
校验表单
使用JSR-303 Validation 来校验
(1)首先改造实体类
.... @NotNull
@Size(min=5, max=16) //非空，5到16个字符
private String userName;
@NotNull
@Size(min=5, max=16) //非空，5到16个字符
private String firstName;
@NotNull
@Size(min=5, max=16) //非空，5到16个字符
private String lastName;
@NotNull
@Size(min=5, max=25) //非空，5到25个字符
private String password;
....
(2)然后改造控制器中的方法
..... @RequestMapping(value="/register", method=RequestMethod.POST)
public String processRegistration(@Valid Spittle spittle, Errors errors) {
System.out.println(errors.hasErrors()+"");
if (errors.hasErrors()) {
return "registerForm";
}
repository.save(spittle);
return "redirect:/spitter/" + spittle.getUserName();
} ......
需要的jar包有 classmate-1.0.0、hibernate-jpa-2.1-api-1.0.2.Final、hibernate-validator-5.1.0.Final、jboss-logging-3.3.2.Final、joda-time-2.1、jsoup-1.7.1、paranamer-2.5.5、validation-api-2.0.1.Final
当参数校验不通过的时候会返回到registerForm页面
原文地址：https://www.cnblogs.com/codefeng/p/8975037.html
时间： 2024-11-07 21:48:24