JSR303实现数据校验案例

jr303_01

jr303_02

1、导包

<!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-validator -->
    <dependency>
      <groupId>org.hibernate</groupId>
      <artifactId>hibernate-validator</artifactId>
      <version>5.4.1.Final</version>
    </dependency>

2、实体类

package com.yl.bean;

import lombok.Data;
import lombok.NoArgsConstructor;
import org.hibernate.validator.constraints.NotEmpty;
import org.springframework.format.annotation.DateTimeFormat;

import javax.validation.constraints.NotNull;
import java.io.Serializable;
import java.util.Date;

/**
 * 图书实体类
 */
@Data
@NoArgsConstructor
public class Book implements Serializable {
    private Integer id;
    @NotEmpty(message = "书名不能为空")
    private String name;
    private String author;
    private Date date;
    private Float price;
}

3、表单

<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %>
<%--
  Created by IntelliJ IDEA.
  User: aq
  Date: 2020/10/26
  Time: 21:10
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>

<html>
<head>
    <title>Add</title>
</head>
<body>
<form:form modelAttribute="book" action="${pageContext.servletContext.contextPath}/book/add" method="post">
    书名：<form:input path="name"/><form:errors path="name" cssStyle="color: red"></form:errors><br>
    作者：<form:input  path="author"/><br>
    出版日期：<form:input path="date"/><br>
    价格：<form:input path="price"/><br>
    <button type="submit">添加</button>
</form:form>
</body>
</html>

4、控制器

package com.yl.controller;

import com.github.pagehelper.PageInfo;
import com.yl.bean.Book;
import com.yl.service.IBookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.validation.Errors;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.SessionAttributes;
import org.springframework.web.bind.support.SessionStatus;
import org.springframework.web.servlet.ModelAndView;

import javax.validation.Valid;
import java.util.List;

/**
 * 图书控制器类
 */
@Controller
@RequestMapping("/book")
@SessionAttributes(value = {"pageBook","queryBook"}, types = {PageInfo.class, String.class, Book.class})
public class BookController {
    @Autowired
    private IBookService bookService;//图书业务层对象

    /**
     * 添加图书
     */
    @RequestMapping("/add")
    public ModelAndView add(@Valid Book book, Errors errors,SessionStatus sessionStatus) {
        ModelAndView modelAndView=new ModelAndView();

        if (errors.hasErrors()){
            modelAndView.setViewName("add");
            return modelAndView;
        }
        //调用业务层添加图书方法
        bookService.add(book);

        return queryByCondition(null,1);
    }

    /**
     *添加图书跳转页面
     */
    @RequestMapping("/addSkip")
    public ModelAndView addSkip(){
        ModelAndView modelAndView=new ModelAndView();
        modelAndView.addObject("book",new Book());
        modelAndView.setViewName("add");
        return modelAndView;
    }
    
}

注意：表单的modelAttribute属性值是从requsetScope中传过来的，即必须先请求控制器，在控制器中给modelAttribute赋值才能使用；默认是command的属性值，也可以自己赋值。

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