Java-springMVC服务端数据校验如何实现?

新建一个动态web工程命名 demo_springMVC_validate
导入对应的jar包并添加到内路径

导入对应的配置文件

springmvc-servlet.xml





    
        
          
    

    

    
    
        
        
    


    
        
            
                classpath:customerValidationMessages

web.xml



  demo_springMVC_helloworld
  
    springmvc
    org.springframework.web.servlet.DispatcherServlet
  
  
    springmvc
    *.do
  
  
    index.html
    index.htm
    index.jsp
    default.html
    default.htm
    default.jsp

新建包 net.ptcs.demo.controller
新建Jsp页面 add_book.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>




添加图书页面


    

        
            
                ${e.defaultMessage}

            
        


        bookId:
 bookName:
 intoStoreTime:
 publishName:
 price:

此时报错信息如下：

Multiple annotations found at this line:
    - The superclass "javax.servlet.http.HttpServlet" was not found on the Java 
     Build Path
    - Line breakpoint:add_book.jsp [line: 1]

解决方法：
项目右键 ----> Configure Build Path -----> Java Build Path ---> Add Library ---> Server RunTime ----> Next ---> Apache Tomcat v8.0 ---> Finish ---> Apply ---> Apply and close

最后成功解决咯报错，如图所示

新建一个 Book 实体类

package net.ptcs.demo.entity;

import java.util.Date;

import javax.validation.constraints.DecimalMin;
import javax.validation.constraints.Digits;
import javax.validation.constraints.NotBlank;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Pattern;
import javax.validation.constraints.Size;

public class Book {
    /*bookId:非空校验，整数校验，大于0的校验
     * bookName:非空校验，不能有非法字符（符合书名的正则表达式规范）
     * intoStoreTime：非空校验
     * publishName：非空校验，不能有非法字符（符合出版社名的正则表达式规范）
     * price：非空校验，大于0，小数校验*/
    
    @NotNull(message="{book.bookId.isNull}")
    private Integer bookId;
    @NotBlank(message="{book.bookName.isNull}")
    @Size(min=3,max=40,message="{book.bookName.size}")
    private String bookName;
    @NotNull(message="{book.intoStoreTime.isNull}")
    private Date intoStoreTime;
    @NotBlank(message="{book.publishName.isNull}")
    private String publishName;
    
    
    @Pattern(regexp = "^1(3|4|5|7|8)\\d{9}$",message = "手机号码格式错误")
    @NotBlank(message = "手机号码不能为空")
    private String phone;
    
    
    @NotNull(message="{book.price.isNull}")//对于数字校验是否为空使用@NotNull,String类型使用@NotBlank list类型使用@NotEmpty
    @Digits(fraction = 2, integer = 100, message="{book.price.error}")//对于小数进行校验，限定整数数位integer和小数数位fraction
    @DecimalMin(value = "0", message="{book.price.value}")//对值进行校验，必须大于等于value的值
    private Double price;

    public Book() {
        super();
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    @Override
    public String toString() {
        return "Book [bookId=" + bookId + ", bookName=" + bookName
                + ", intoStoreTime=" + intoStoreTime + ", publishName="
                + publishName + ", price=" + price + "]";
    }

    public Book(Integer bookId, String bookName, Date intoStoreTime,
            String publishName, Double price) {
        super();
        this.bookId = bookId;
        this.bookName = bookName;
        this.intoStoreTime = intoStoreTime;
        this.publishName = publishName;
        this.price = price;
    }

    public Integer getBookId() {
        return bookId;
    }

    public void setBookId(Integer bookId) {
        this.bookId = bookId;
    }

    public String getBookName() {
        return bookName;
    }

    public void setBookName(String bookName) {
        this.bookName = bookName;
    }

    public Date getIntoStoreTime() {
        return intoStoreTime;
    }

    public void setIntoStoreTime(Date intoStoreTime) {
        this.intoStoreTime = intoStoreTime;
    }

    public String getPublishName() {
        return publishName;
    }

    public void setPublishName(String publishName) {
        this.publishName = publishName;
    }

    public Double getPrice() {
        return price;
    }

    public void setPrice(Double price) {
        this.price = price;
    }
}

在 net.ptcs.demo.controller 内下新建 BookController类

package net.ptcs.demo.controller;

import java.util.List;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.validation.BindingResult;
import org.springframework.validation.ObjectError;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.RequestMapping;

import net.ptcs.demo.entity.Book;

/**
 * 图书管理模块的控制器，也叫做处理器
* Title: BookController  
* Description:   
* @author xianxian 
* @date 2019年6月25日
*/

@Controller
@RequestMapping("book")
public class BookController {
    /**
     * use:处理页面添加图书的请求
     * 
     * 今天我们的需求：
     * 1.在处理添加图书请求前对book对象中的属性进行校验：
     * bookId:非空校验，整数校验，大于0的校验
     * bookName:非空校验，不能有非法字符（符合书名的正则表达式规范）
     * intoStoreTime：非空校验
     * publishName：非空校验，不能有非法字符（符合出版社名的正则表达式规范）
     * price：非空校验，大于0，小数校验
     * 
     * 2.校验的时机：addBook方法调用之前校验，如果校验通过那么继续，没有通过那么返回页面，提示出错信息
     * 
     * @param book
     * @return
     */
    @RequestMapping("addBook.do")
    public String addBook(@Validated Book book,BindingResult bindingResult,Model model)
    {
        List errors=bindingResult.getAllErrors();
        
        if(errors.size()>0)
        {
            //校验失败
//          把出错信息传给页面
            model.addAttribute("errors", errors);
            model.addAttribute("book", book);
            return "add_book";//   /+add_book+.jsp
        }else
        {
            //校验成功
            System.out.println("into addBook()方法。。。。。");
            System.out.println("book:"+book);
            return "";
        }
    }
}

src 目录下新建一个 customerValidationMessages.properties

book.bookId.isNull=\u56FE\u4E66\u7F16\u53F7\u4E0D\u80FD\u4E3A\u7A7A
book.bookName.isNull=\u56FE\u4E66\u540D\u79F0\u4E0D\u80FD\u4E3A\u7A7A
book.intoStoreTime.isNull=\u5165\u5E93\u65F6\u95F4\u4E0D\u80FD\u4E3A\u7A7A
book.publishName.isNull=\u51FA\u7248\u793E\u540D\u79F0\u4E0D\u80FD\u4E3A\u7A7A
book.price.isNull=\u4EF7\u683C\u4E0D\u80FD\u4E3A\u7A7A
book.bookName.size=\u56FE\u4E66\u540D\u79F0\u957F\u5EA6\u6700\u5C0F\u662F3\uFF0C\u6700\u5927\u662F40
book.price.isNull=\u4E66\u7684\u4EF7\u683C\u4E0D\u80FD\u4E3A\u7A7A
book.price.error=\u4E66\u7684\u4EF7\u683C\u683C\u5F0F\u9519\u8BEF
book.price.value=\u4E66\u7684\u4EF7\u683C\u5FC5\u987B\u5927\u4E8E0

新建 net.ptcs.demo.converter 包下的 CustomerDateConverter 类

package net.ptcs.demo.converter;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.springframework.core.convert.converter.Converter;

public class CustomerDateConverter implements Converter {
    @Override
    public Date convert(String source) {
        Date date=null;
        if(source!=null && !"".equals(source))
        {
            SimpleDateFormat sdf=new SimpleDateFormat("yyyy-MM-dd");
            try {
                date=sdf.parse(source);
            } catch (ParseException e) {
                e.printStackTrace();
            }
        }
        return date;
    }
}

运行并测试

出现如下报错：

原因：

springmvc-servlet.xml 中的 value 值与配置文件名不一致

解决：

将这两名字更改为统一

如图所示，测试成功

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Java-springMVC服务端数据校验如何实现?

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