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：https://www.cnblogs.com/codefeng/p/8975037.html