第6章 Spring MVC的数据转换、格式化和数据校验

2023-07-24 16:30:04

使用ConversionService转换数据

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!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>测试ConversionService</title>

</head>

<body>

<h3>注册页面</h3>

<form action="register" method="post">

    <table>

        <tr>

           <td><label>登录名：</label></td>

           <td><input type="text" id="loginname" name="loginname"></td>

        </tr>

        <tr>

            <td><label>生日：</label></td>

            <td><input type="text" id="birthday" name="birthday"></td>

        </tr>

        <tr>

            <td><input id="submit" type="submit" value="登录"></td>

        </tr>

    </table>

</form>

</body>

</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%>

<!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>测试ConversionService</title>

</head>

<body>

登录名：${requestScope.user.loginname }<br>

生日：<fmt:formatDate value="${requestScope.user.birthday}" pattern="yyyy年MM月dd日"/><br/>

</body>

</html>
package org.fkit.dmain;

import java.io.Serializable;

import java.util.Date;

public class User implements Serializable{

      private String loginname;

      private Date birthday;

      public User() {

        super();

        // TODO Auto-generated constructor stub

      }

    public String getLoginname() {

        return loginname;

    }

    public void setLoginname(String loginname) {

        this.loginname = loginname;

    }

    public Date getBirthday() {

        return birthday;

    }

    public void setBirthday(Date birthday) {

        this.birthday = birthday;

    }

    @Override

    public String toString() {

        return "User [loginname=" + loginname + ", birthday=" + birthday + "]";

    }

}
package org.fkit.converter;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Date;

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

// 实现Converter<S,T>接口

public class StringToDateConverter implements Converter<String, Date>{

   // 日期类型模板：如yyyy--MM-dd

    private String datePattern;

    public void setDatePattern(String datePattern) {

        this.datePattern = datePattern;

    }

    // Converter<S,T>接口的类型转换方法

    public Date convert(String date) {

        try {

        // TODO Auto-generated method stub

        SimpleDateFormat dateFormat = new SimpleDateFormat(this.datePattern);

        // 将日期字符串转换成Date类型返回

            return dateFormat.parse(date);

        } catch (ParseException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

            System.out.println("日期转换失败!");

            return null;

        }

    }

}
package org.fkit.controller;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.fkit.dmain.User;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.web.bind.annotation.ModelAttribute;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

@Controller

public class UserController {

  private static final Log logger = LogFactory.getLog(UserController.class);

  @RequestMapping(value="/{formName}")

  public String loginForm(@PathVariable String formName){

      // 动态跳转页面

      return formName;

  }

  @RequestMapping(value="/register",method=RequestMethod.POST,produces="text/html;charset=UTF-8")

/*  public String register(

          @ModelAttribute User user,

          Model model){*/

  public String register(

          User user,

          Model model){

      logger.info(user);

      System.out.println(user);

      model.addAttribute("user", user);

      System.out.println(user);

      return "success";

  }

}
<?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:p="http://www.springframework.org/schema/p"

    xmlns:mvc="http://www.springframework.org/schema/mvc"

    xmlns:context="http://www.springframework.org/schema/context"

    xsi:schemaLocation="

        http://www.springframework.org/schema/beans

        http://www.springframework.org/schema/beans/spring-beans-4.2.xsd

        http://www.springframework.org/schema/mvc

        http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd

        http://www.springframework.org/schema/context

        http://www.springframework.org/schema/context/spring-context-4.2.xsd">

        <!-- spring可以自动去扫描base-pack下面的包或者子包下面的java文件，

                          如果扫描到有Spring的相关注解的类，则把这些类注册为Spring的bean

         -->

        <context:component-scan base-package="org.fkit.controller"></context:component-scan>

        <!-- 装配自定义的类型转换器 -->

        <mvc:annotation-driven conversion-service="conversionService"></mvc:annotation-driven>

        <!-- 自定义的类型转换器 -->

        <bean id="conversionService"

               class="org.springframework.context.support.ConversionServiceFactoryBean">

               <property name="converters">

                  <list>

                     <bean class="org.fkit.converter.StringToDateConverter"

                     p:datePattern="yyyy-MM-dd"></bean>

                  </list>

               </property>

               </bean>

        <!-- 视图解析器 -->

        <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">

           <!-- 前缀 -->

           <property name="prefix">

              <value>/WEB-INF/content/</value>

           </property>

           <!-- 后缀 -->

           <property name="suffix">

              <value>.jsp</value>

           </property>

        </bean>

        </beans>
<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xmlns="http://xmlns.jcp.org/xml/ns/javaee"

    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee

    http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"

    id="WebApp_ID" version="3.1">

        <filter>

       <filter-name>characterEncodingFilter</filter-name>

       <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>

       <init-param>

          <param-name>encoding</param-name>

           <param-value>UTF-8</param-value>

       </init-param>

       <init-param>

           <param-name>forceEncoding</param-name>

           <param-value>true</param-value>

       </init-param>

    </filter>

    <filter-mapping>

        <filter-name>characterEncodingFilter</filter-name>

        <url-pattern>/*</url-pattern>

    </filter-mapping>

    <!-- 定义Spring MVC的前端控制器 -->

    <servlet>

    <servlet-name>springmvc</servlet-name>

    <servlet-class>

    org.springframework.web.servlet.DispatcherServlet

    </servlet-class>

    <init-param>

       <param-name>contextConfigLocation</param-name>

       <param-value>/WEB-INF/springmvc-config.xml</param-value>

    </init-param>

    <load-on-startup>1</load-on-startup>

    </servlet>

    <!-- 让Spring MVC的前端控制器拦截所有请求 -->

    <servlet-mapping>

      <servlet-name>springmvc</servlet-name>

      <url-pattern>/</url-pattern>

    </servlet-mapping>

</web-app>

使用@InitBinder添加自定义编辑器转换数据

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!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>测试@InitBinder</title>

</head>

<body>

<h3>测试@InitBinder</h3>

<form action="register" method="post">

      <table>

         <tr>

            <td><label>登录名：</label></td>

            <td><input type="text" id="loginname" name="loginname"></td>

         </tr>

         <tr>

            <td><label>生日：</label></td>

            <td><input type="text" id="birthday" name="birthday"></td>

         </tr>

         <tr>

             <td><input id="submit" type="submit" value="登录"></td>

         </tr>

      </table>

</form>

</body>

</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%>

<!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>测试@InitBinder</title>

</head>

<body>

登录名：${requestScope.user.loginname}<br>

生日：<fmt:formatDate value="${requestScope.user.birthday}" pattern="yyyy年MM月dd日"/><br>

</body>

</html>
package org.fkit.domain;

import java.io.Serializable;

import java.util.Date;

public class User implements Serializable{

      private String loginname;

      private Date birthday;

    public User() {

        super();

        // TODO Auto-generated constructor stub

    }

    public String getLoginname() {

        return loginname;

    }

    public void setLoginname(String loginname) {

        this.loginname = loginname;

    }

    public Date getBirthday() {

        return birthday;

    }

    public void setBirthday(Date birthday) {

        this.birthday = birthday;

    }

    @Override

    public String toString() {

        return "User [loginname=" + loginname + ", birthday=" + birthday + "]";

    }

}
package org.fkit.converter;

import java.beans.PropertyEditorSupport;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Date;

//自定义属性编辑器

public class DateEditor extends PropertyEditorSupport{

    // 将传入的字符串数据转换成Date类型

    @Override

    public void setAsText(String text) throws IllegalArgumentException {

        // TODO Auto-generated method stub

        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");

        try {

            Date date = dateFormat.parse(text);

            setValue(date);

        } catch (ParseException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }

}
package org.fkit.controller;

import java.util.Date;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.fkit.converter.DateEditor;

import org.fkit.domain.User;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.web.bind.WebDataBinder;

import org.springframework.web.bind.annotation.InitBinder;

import org.springframework.web.bind.annotation.ModelAttribute;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

@Controller

public class UserController {

    private static final Log logger = LogFactory.getLog(UserController.class);

    @RequestMapping(value="/{formName}")

    public String loginForm(@PathVariable String formName){

        // 动态跳转页面

        return formName;

    }

    // 在控制器初始化时注册属性编辑器

    @InitBinder

      public void initBinder(WebDataBinder binder){

        //注册自定义编辑器

        binder.registerCustomEditor(Date.class, new DateEditor());

    }

    @RequestMapping(value="/register",method=RequestMethod.POST)

    public String register(

                  @ModelAttribute User user,

                  Model mode){

        logger.info(user);

        mode.addAttribute("user", user);

        return "success";

    }

}
<?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:p="http://www.springframework.org/schema/p"

    xmlns:mvc="http://www.springframework.org/schema/mvc"

    xmlns:context="http://www.springframework.org/schema/context"

    xsi:schemaLocation="

        http://www.springframework.org/schema/beans

        http://www.springframework.org/schema/beans/spring-beans-4.2.xsd

        http://www.springframework.org/schema/mvc

        http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd

        http://www.springframework.org/schema/context

        http://www.springframework.org/schema/context/spring-context-4.2.xsd">

        <!-- spring可以自动去扫描base-pack下面的包或者子包下面的java文件，

                          如果扫描到有Spring的相关注解的类，则把这些类注册为Spring的bean

         -->

        <context:component-scan base-package="org.fkit.controller"></context:component-scan>

        <!-- 视图解析器 -->

          <bean id="viewResolver"

               class="org.springframework.web.servlet.view.InternalResourceViewResolver">

               <!-- 前缀 -->

               <property name="prefix">

                  <value>/WEB-INF/content/</value>

               </property>

               <!-- 后缀 -->

               <property name="suffix">

                   <value>.jsp</value>

               </property>

               </bean>

        </beans>
<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xmlns="http://xmlns.jcp.org/xml/ns/javaee"

    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee

    http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"

    id="WebApp_ID" version="3.1">

    <!-- 定义Spring MVC的前端控制器 -->

    <servlet>

    <servlet-name>springmvc</servlet-name>

    <servlet-class>

       org.springframework.web.servlet.DispatcherServlet

    </servlet-class>

    <init-param>

       <param-name>contextConfigLocation</param-name>

       <param-value>/WEB-INF/springmvc-config.xml</param-value>

    </init-param>

    <load-on-startup>1</load-on-startup>

    </servlet>

    <!-- 让Spring MVC的前端控制器拦截所有请求 -->

    <servlet-mapping>

       <servlet-name>springmvc</servlet-name>

       <url-pattern>/</url-pattern>

    </servlet-mapping>

    <!-- 编码过滤器 -->

    <filter>

       <filter-name>characterEncodingFilter</filter-name>

       <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>

       <init-param>

          <param-name>encoding</param-name>

          <param-value>UTF-8</param-value>

       </init-param>

    </filter>

    <filter-mapping>

       <filter-name>characterEncodingFilter</filter-name>

       <url-pattern>/*</url-pattern>

    </filter-mapping>

</web-app>

示例：使用WebBindingInitializer注册全局自定义编辑器转换数据

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<!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>测试WebBindingInitializer</title>

</head>

<body>

<h3>测试WebBindingInitializer</h3>

<form action="register" method="post">

   <table>

      <tr>

         <td><label>登录名：</label></td>

         <td><input type="text" id="loginname" name="loginname"></td>

      </tr>

      <tr>

         <td><label>生日：</label></td>

         <td><input type="text" id="birthday" name="birthday"></td>

      </tr>

      <tr>

         <td><input id="submit" type="submit" value="登录"></td>

      </tr>

   </table>

</form>

</body>

</html>
<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%>

<!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>测试WebBindingInitializer</title>

</head>

<body>

登录名：${requestScope.user.loginname}<br>

生日： <fmt:formatDate value="${requestScope.user.birthday}" pattern="yyyy年MM月dd日"/><br>

</body>

</html>
<?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:p="http://www.springframework.org/schema/p"

    xmlns:mvc="http://www.springframework.org/schema/mvc"

    xmlns:context="http://www.springframework.org/schema/context"

    xsi:schemaLocation="

        http://www.springframework.org/schema/beans

        http://www.springframework.org/schema/beans/spring-beans-4.2.xsd

        http://www.springframework.org/schema/mvc

        http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd

        http://www.springframework.org/schema/context

        http://www.springframework.org/schema/context/spring-context-4.2.xsd">

        <!-- spring可以自动去扫描base-pack下面的包或者子包下面的java文件，

                                      如果扫描到有Spring的相关注解的类，则把这些类注册为Spring的bean

         -->

        <context:component-scan base-package="org.fkit.controller"></context:component-scan>

        <!-- 视图解析器 -->

        <bean id="viewResolver"

              class="org.springframework.web.servlet.view.InternalResourceViewResolver">

          <!-- 前缀 -->

          <property name="prefix">

              <value>/WEB-INF/content/</value>

          </property>

          <!-- 后缀 -->

          <property name="suffix">

              <value>.jsp</value>

          </property>

          </bean>

        <!-- 通过AnnotationMethodHandlerAdapter装配自定义编辑器 -->

        <bean

             class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">

               <property name="webBindingInitializer">

                  <bean class="org.fkjava.binding.DateBindingInitializer"></bean>

               </property>

             </bean>

        </beans>
<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">

  <!-- 定义Spring MVC的前端控制器 -->

    <servlet>

       <servlet-name>springmvc</servlet-name>

       <servlet-class>

           org.springframework.web.servlet.DispatcherServlet

       </servlet-class>

       <init-param>

          <param-name>contextConfigLocation</param-name>

          <param-value>/WEB-INF/springmvc-config.xml</param-value>      

       </init-param>

       <load-on-startup>1</load-on-startup>

    </servlet>

    <!-- 让Spring MVC的前端控制器拦截所有请求 -->

    <servlet-mapping>

       <servlet-name>springmvc</servlet-name>

       <url-pattern>/</url-pattern>

    </servlet-mapping>

    <!-- 编码过滤器 -->

    <filter>

        <filter-name>characterEncodingFilter</filter-name>

        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>

        <init-param>

           <param-name>encoding</param-name>

           <param-value>UTF-8</param-value>

        </init-param>

    </filter>

    <filter-mapping>

       <filter-name>characterEncodingFilter</filter-name>

       <url-pattern>/*</url-pattern>    

    </filter-mapping>

</web-app>
package org.fkit.controller;

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

import org.fkit.domain.User;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.web.bind.annotation.ModelAttribute;

import org.springframework.web.bind.annotation.PathVariable;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

/**

 * UserController是一个基于注解的控制器,

 * 可以同时处理多个请求动作，并且无须实现任何接口。

 * org.springframework.stereotype.Controller注解用于指示该类是一个控制器

 * @author ZHONGZHENHUA

 *

 */

@Controller

public class UserController {

     private static final Log logger = LogFactory.getLog(UserController.class);

     @RequestMapping(value="/{formName}")

      public String loginForm(@PathVariable String formName){

         // 动态跳转页面

         return formName;

     }

     @RequestMapping(value="/register",method=RequestMethod.POST)

     public String register(

             @ModelAttribute User user,

             Model model) {

         logger.info(user);

         model.addAttribute("user", user);

        return "success";

     }

}
package org.fkit.converter;

import java.beans.PropertyEditorSupport;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Date;

public class DateEditor extends PropertyEditorSupport{

    // 将传入的字符串数据转换成Date类型

    @Override

    public void setAsText(String text) throws IllegalArgumentException {

        // TODO Auto-generated method stub

        SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");

        try {

            Date date = dateFormat.parse(text);

            setValue(date);

        } catch (ParseException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

    }

}
package org.fkit.domain;

import java.io.Serializable;

import java.util.Date;

public class User implements Serializable{

   private String loginname;

   private Date birthday;

   public User() {

      super();

    // TODO Auto-generated constructor stub

   }

   public String getLoginname() {

      return loginname;

   }

   public void setLoginname(String loginname) {

      this.loginname = loginname;

   }

   public Date getBirthday() {

      return birthday;

   }

   public void setBirthday(Date birthday) {

     this.birthday = birthday;

   }

}
package org.fkjava.binding;

import java.util.Date;

import org.fkit.converter.DateEditor;

import org.springframework.web.bind.WebDataBinder;

import org.springframework.web.bind.support.WebBindingInitializer;

import org.springframework.web.context.request.WebRequest;

// 实现WebBindingInitializer接口

public class DateBindingInitializer implements WebBindingInitializer{

    @Override

    public void initBinder(WebDataBinder binder, WebRequest request) {

        // TODO Auto-generated method stub

        // 注册自定义编辑器

        binder.registerCustomEditor(Date.class, new DateEditor());

    }

}
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