019 数据绑定流程分析(校验)

一：校验

1.校验的步骤

　　使用JSP 303验证标准

　　加入Hibernate validator的jar

　　在springmvc配置文件中加入<mvc:annotation-driven/>

　　需要在bean的属性上添加@Valid注解

2.添加lib　　

　　hibernate的lib

　　然后需要添加hibernate需要的required中的lib包

3.添加验证的注解

package com.spring.it.enties;

import java.util.Date;

import javax.validation.constraints.Past;

import org.hibernate.validator.constraints.Email;
import org.hibernate.validator.constraints.NotEmpty;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.format.annotation.NumberFormat;

public class Employee {
    
    private Integer id;
    @NotEmpty
    private String lastName;
    @Email
    private String email;
    //1 male, 0 female
    private Integer gender;
    private Department department;
    //birth
    @Past
    @DateTimeFormat(pattern="yyyy-MM-dd")
    private Date birth;
    //salary
    @NumberFormat(pattern="###.#")
    private Float salary;
    
    public Employee(Integer id, String lastName, String email, Integer gender,
            Department department) {
        this.id = id;
        this.lastName = lastName;
        this.email = email;
        this.gender = gender;
        this.department = department;
    }

    public Employee() {
        
    }
    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName =lastName;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public Integer getGender() {
        return gender;
    }

    public void setGender(Integer gender) {
        this.gender = gender;
    }

    public Department getDepartment() {
        return department;
    }

    public void setDepartment(Department department) {
        this.department = department;
    }

    public Date getBirth() {
        return birth;
    }

    public void setBirth(Date birth) {
        this.birth = birth;
    }
//

    public Float getSalary() {
        return salary;
    }

    public void setSalary(Float salary) {
        this.salary = salary;
    }

    @Override
    public String toString() {
        return "Employee [id=" + id + ", lastName=" + lastName + ", email=" + email + ", gender=" + gender
                + ", department=" + department + ", birth=" + birth + ", salary=" + salary + "]";
    }
        
}

4.保存上添加@Valid注解

/**
     * 保存，是submit提交过来的请求，属于Post请求
     */
    @RequestMapping(value="/emp",method=RequestMethod.POST)
    public String save(@Valid Employee employee,BindingResult result) {
        System.out.println(employee);
        if(result.getErrorCount()>0) {
            System.out.println("has error");
            for(FieldError error:result.getFieldErrors()) {
                System.out.println(error.getField()+":"+error.getDefaultMessage());
            }
        }
        employeeDao.save(employee);
        return "redirect:/emps";
    }

二：出错跳转页面

1.程序

　　这个主要的逻辑是save之后的处理。

　　要将department回显，所以save函数中要添加map。

/**
     * 保存，是submit提交过来的请求，属于Post请求
     */
    @RequestMapping(value="/emp",method=RequestMethod.POST)
    public String save(@Valid Employee employee,BindingResult result,Map<String,Object> map) {
        System.out.println(employee);
        if(result.getErrorCount()>0) {
            System.out.println("has error");
            for(FieldError error:result.getFieldErrors()) {
                System.out.println(error.getField()+":"+error.getDefaultMessage());
            }
            //如果出错，则转向定制的页面
            map.put("department", departmentDao.getDepartments());
            return "input";
        }
        employeeDao.save(employee);
        return "redirect:/emps";
    }

2.效果

　　就是提交之后，还是这个页面

　　

三：在页面上显示这个错误信息

1.input程序

　　在每一个要验证的字段后面写上：<form:errors path="birth"></form:errors><br>

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<%@ page import="java.util.Map"%>
<%@ page import="java.util.HashMap"%>
<%@ 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=utf-8">
<title>Insert title here</title>
</head>
<body>
    <form action="testConversionServiceConver" method="POST">
        
        <!-- lastname-email-gender-department.id -->
        <!-- GG-gg@123.com-0-105 -->
        Employee:<input type="text" name="employee"/>
        <input type="submit" values="Submit">
    </form>
    <br><br>
    <br><br><br><br><br><br>


    <!-- id lastName email  gender department -->
    <!-- modelAttribute默认的bean是command，需要改成对应的bean -->
    <form:form action="${pageContext.request.contextPath}/emp" method="POST" modelAttribute="employee">
        <!-- lastName在修改的时候，不能被显示 -->
        <c:if test="${employee.id == null}">
            LastName:<form:input path="lastName"/>
            <form:errors path="lastName"></form:errors><br>
        </c:if>
        <c:if test="${employee.id != null}">
            <form:hidden path="id"/>
            <!-- 不能使用form标签，因为modelAttribute对应的bean中没有_method这个属性，只能使用input -->
            <input type="hidden" name="_method" value="PUT"/>
        </c:if>

        Email:<form:input path="email"/>
        <form:errors path="email"></form:errors><br>
        <%
            Map<String,String> genders=new HashMap();
            genders.put("1", "Male");
            genders.put("0", "Female");
            request.setAttribute("genders", genders);
        %>
        Gender:<form:radiobuttons path="gender" items="${genders}"/><br>
        Department:<form:select path="department.id" 
                        items="${department}" itemLabel="departmentName" itemValue="id"></form:select><br>
                        
        <!-- 演示格式化 -->
        Birth:<form:input path="birth"/>
        <form:errors path="birth"></form:errors><br>
        Salary:<form:input path="salary"/><br>
        <input type="submit" values="Submit">
    </form:form>
</body>
</html>

2.效果

　　

四：国际化资源文件

1.添加I18n.properties

　　注意写法：

　　

NotEmpty.employee.lastName=u4E0Du80FDu4E3Au7A7A
Email.employee.email=u4E0Du662Fu5408u6CD5u7684u90AEu4EF6
Past.employee.birth=u4E0Du80FDu662Fu672Au6765u7684u4E00u4E2Au65F6u95F4

2.springmvc.xml中配置国际化

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
    http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-4.0.xsd
        http://www.springframework.org/schema/mvc 
        http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
    <!-- 配置自定义扫描的包 -->               
    <context:component-scan base-package="com.spring.it" ></context:component-scan>
    
    <!-- 配置视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views/" />
          <property name="suffix" value=".jsp" />
    </bean>    
    
    <mvc:annotation-driven></mvc:annotation-driven>
    
    <!-- 转换器 -->
    <bean id="conversionService" class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
        <property name="converters">
            <set>
                <ref bean="employeeConverter"/>
            </set>
        </property>
    </bean>
    <mvc:annotation-driven conversion-service="conversionService"></mvc:annotation-driven>
    
    <mvc:default-servlet-handler/>
    <mvc:annotation-driven ignore-default-model-on-redirect="true"></mvc:annotation-driven>
    
    <!-- 国家化 -->
    <bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
        <property name="basename" value="i18n"></property>
    </bean>
</beans>

3.效果