SpringMVC 5.0.4集成easyexcel读取excel文档

Posted 2023-05-01

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参考技术A

Java解析、生成Excel比较有名的框架有Apache poi、jxl。但他们都存在一个严重的问题就是非常的耗内存，poi有一套SAX模式的API可以一定程度的解决一些内存溢出的问题，但POI还是有一些缺陷，比如07版Excel解压缩以及解压后存储都是在内存中完成的，内存消耗依然很大。Easyexcel重写了poi对07版Excel的解析，能够原本一个3M的excel用POI sax依然需要100M左右内存降低到KB级别，并且再大的excel不会出现内存溢出，03版依赖POI的sax模式。在上层做了模型转换的封装，让使用者更加简单方便。Easyexcel的Github地址：https://github.com/alibaba/easyexcel。

EasyExcel优势

· 注解式自定义操作。

· 输入输出简单，提供输入输出过程的接口

· 支持一定程度的单元格合并等灵活化操作

EasyExcel劣势

· 框架不成熟，1.1.0版本后提供灵活接口的只剩beta版本

· 依然存在一些bug

· 没有一套完整的api

第一步：pom.xml添加依赖，引入jar包：

版本依赖:

第二步：POJO对象编写：

Student.java实体对象继承BaseRowModel，编写如下:

第三步：编写监听器，实现对导入的excel文档的处理，实例如下：

注：具体数据库入库业务代码本文略过，请对应实现业务。

第四步：控制类中调用，进入导入页JSP页addBatchArchivesUser.jsp方法为toAddBatchArchivesUser（String backFlag），保存数据方法为：addBatchArchivesUser(@RequestParam("file") MultipartFile mfile,String orgId,String carCategory)代码如下：

注核心要点：一、根据上传文件后缀为xls、xlsx对ExcelReader中传对应的枚举参数，实现对office 2003 以前的版本和之后版本的区分处理；二、通过监听器的构造函数，从控制类传要调用的服务类（userService）；三、通过监听器相关的get方法，将处理结果返回，如本文中的listener.getResult();以上三点，对于初次使用者容易出错。

SpringMVC

文章目录

Spring MVC多动作控制器

MultiActionController类用于在单个控制器中分别映射多个URL到对应的方法。

package com.yiibai.springmvc;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.multiaction.MultiActionController;

public class UserController extends MultiActionController{

   public ModelAndView home(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("home");
      model.addObject("message", "Home");
      return model;
   }

   public ModelAndView add(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("user");
      model.addObject("message", "Add");
      return model;
   }

   public ModelAndView remove(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("user");
      model.addObject("message", "Remove");
      return model;
   }
}

URL映射配置文件

<bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
   <bean name="/home.html" class="com.yiibai.springmvc.UserController" /> 
   <bean name="/user/*.html" class="com.yiibai.springmvc.UserController" />

对于/home.html请求，DispatcherServlet将请求转发到UserController类的 home()方法。
对于user/add.html，DispatcherServlet将请求转发到UserController类的 add()方法。
对于user/remove.html，DispatcherServlet将请求转发到UserController类的 remove()方法。

Spring MVC多动作控制器样例

创建一个名称为 MultiActionController的动态WEB项目
在 com.yiibai.springmvc包下创建一个Java类UserController。
在jsp子文件夹下创建两个视图文件：home.jsp 和 user.jsp

UserController.java

package com.yiibai.springmvc;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.multiaction.MultiActionController;

public class UserController extends MultiActionController{

   public ModelAndView home(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("home");
      model.addObject("message", "Home");
      return model;
   }

   public ModelAndView add(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("user");
      model.addObject("message", "Add");
      return model;
   }

   public ModelAndView remove(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("user");
      model.addObject("message", "Remove");
      return model;
   }
}

MultiActionController-servlet.xml

<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:context="http://www.springframework.org/schema/context"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="
   http://www.springframework.org/schema/beans     
   http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
   http://www.springframework.org/schema/context 
   http://www.springframework.org/schema/context/spring-context-3.0.xsd">

   <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
      <property name="prefix" value="/WEB-INF/jsp/"/>
      <property name="suffix" value=".jsp"/>
   </bean>

   <bean class="org.springframework.web.servlet.handler.BeanNameUrlHandlerMapping"/>
   <bean name="/home.html" 
      class="com.yiibai.springmvc.UserController" /> 
   <bean name="/user/*.html" 
      class="com.yiibai.springmvc.UserController" />    
</beans>

home.jsp

<%@ page contentType="text/html; charset=UTF-8" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Home</title>
</head>
<body>
<body>
<a href="user/add.html" >add()方法</a> <br>
<a href="user/remove.html" >remove()方法</a>
</body>
</html>

user.jsp

<%@ page contentType="text/html; charset=UTF-8" %>
<html>
<head>
<title>User.jsp Page</title>
</head>
<body>
   <h2>${message}</h2>  
</body>
</html>

Spring MVC属性方法名称解析器

MultiActionController类可在单个控制器中分别映射多个URL到对应的方法

package com.yiibai.springmvc;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.multiaction.MultiActionController;

public class UserController extends MultiActionController{

   public ModelAndView home(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("user");
      model.addObject("message", "主页面(Home方法)");
      return model;
   }

   public ModelAndView add(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("user");
      model.addObject("message", "添加(Add方法)");
      return model;
   }

   public ModelAndView remove(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("user");
      model.addObject("message", "删除(Remove方法)");
      return model;
   }
}

URL映射配置文件

<bean class="com.yiibai.springmvc.UserController">
   <property name="methodNameResolver">
      <bean class="org.springframework.web.servlet.mvc.multiaction.PropertiesMethodNameResolver">
         <property name="mappings">
            <props>
               <prop key="/user/home.html">home</prop>
               <prop key="/user/add.html">add</prop>
               <prop key="/user/update.html">update</prop>      
            </props>
         </property>
      </bean>
   </property>
</bean>

对于/user/home.html请求，DispatcherServlet将请求转发到UserController类的 home()方法
对于user/add.html，DispatcherServlet将请求转发到UserController类的add()方法。
对于user/remove.html，DispatcherServlet将请求转发到UserController类的 remove()方法

Spring MVC属性方法名称解析器样例

创建一个名称为 PropertiesMethodNameResolver 的动态WEB项目。
在 com.yiibai.springmvc 包下创建一个Java类UserController。
在jsp子文件夹下创建一个视图文件：user.jsp。

UserController.java

package com.yiibai.springmvc;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.multiaction.MultiActionController;

public class UserController extends MultiActionController{

   public ModelAndView home(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("user");
      model.addObject("message", "主页面(Home方法)");
      return model;
   }

   public ModelAndView add(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("user");
      model.addObject("message", "添加(Add方法)");
      return model;
   }

   public ModelAndView remove(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("user");
      model.addObject("message", "删除(Remove方法)");
      return model;
   }
}

PropertiesMethodNameResolver-servlet.xml

<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:context="http://www.springframework.org/schema/context"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="
   http://www.springframework.org/schema/beans     
   http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
   http://www.springframework.org/schema/context 
   http://www.springframework.org/schema/context/spring-context-3.0.xsd">

   <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
      <property name="prefix" value="/WEB-INF/jsp/"/>
      <property name="suffix" value=".jsp"/>
   </bean>

   <bean class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping"> 
      <property name="caseSensitive" value="true" />
   </bean>
   <bean class="com.yiibai.springmvc.UserController">
      <property name="methodNameResolver">
      <bean class="org.springframework.web.servlet.mvc.multiaction.PropertiesMethodNameResolver">
         <property name="mappings">
            <props>
               <prop key="/user/home.html">home</prop>
               <prop key="/user/add.html">add</prop>
               <prop key="/user/remove.html">remove</prop>
            </props>
         </property>
      </bean>
      </property>
   </bean>  
</beans>

user.jsp

<%@ page contentType="text/html; charset=UTF-8" %>
<html>
<head>
<title>User.jsp Page</title>
</head>
<body>
   <h2>${message}</h2>  
</body>
</html>

Spring MVC参数方法名称解析器

MultiActionController类可在单个控制器中分别映射多个URL到对应的方法

package com.yiibai.springmvc;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.multiaction.MultiActionController;

public class UserController extends MultiActionController{

   public ModelAndView home(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("user");
      model.addObject("message", "Home");
      return model;
   }

   public ModelAndView add(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("user");
      model.addObject("message", "Add");
      return model;
   }

   public ModelAndView remove(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("user");
      model.addObject("message", "Remove");
      return model;
   }
}

URL映射配置文件

<bean class="com.yiibai.springmvc.UserController">
   <property name="methodNameResolver">
      <bean class="org.springframework.web.servlet.mvc.multiaction.ParameterMethodNameResolver">
         <property name="paramName" value="action"/>
      </bean>
   </property>
</bean>

对于/user/*.html?action=home请求，DispatcherServlet将请求转发到UserController类的 home()方法。
对于/user/*.html?action=add，DispatcherServlet将请求转发到UserController类的 add()方法。
对于/user/*.html?action=remove，DispatcherServlet将请求转发到UserController类的 remove()方法

Spring MVC参数方法名称解析器样例

创建一个名称为 ParameterMethodNameResolver 的动态WEB项目
在 com.yiibai.springmvc 包下创建一个Java类UserController
在jsp子文件夹下创建一个视图文件：user.jsp

UserController.java

package com.yiibai.springmvc;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.multiaction.MultiActionController;

public class UserController extends MultiActionController{

   public ModelAndView home(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("user");
      model.addObject("message", "主页面(Home)");
      return model;
   }

   public ModelAndView add(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("user");
      model.addObject("message", "添加(Add方法)");
      return model;
   }

   public ModelAndView remove(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("user");
      model.addObject("message", "删除(Remove方法)");
      return model;
   }
}

ParameterMethodNameResolver-servlet.xml

<beans xmlns="http://www.springframework.org/schema/beans"
   xmlns:context="http://www.springframework.org/schema/context"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="
   http://www.springframework.org/schema/beans     
   http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
   http://www.springframework.org/schema/context 
   http://www.springframework.org/schema/context/spring-context-3.0.xsd">

   <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
      <property name="prefix" value="/WEB-INF/jsp/"/>
      <property name="suffix" value=".jsp"/>
   </bean>

   <bean class="org.springframework.web.servlet.mvc.support.ControllerClassNameHandlerMapping"> 
      <property name="caseSensitive" value="true" />
   </bean>
   <bean class="com.yiibai.springmvc.UserController">
      <property name="methodNameResolver">
         <bean class="org.springframework.web.servlet.mvc.multiaction.ParameterMethodNameResolver">
            <property name="paramName" value="action"/>
         </bean>
      </property>
   </bean>
</beans>

user.jsp

<%@ page contentType="text/html; charset=UTF-8" %>
<html>
<head>
<title>User.jsp Page</title>
</head>
<body>
   <h2>${message}</h2>  
</body>
</html>

Spring MVC可参数化的视图控制器

可参数化视图允许将请求映射到网页。

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.multiaction.MultiActionController;

public class UserController extends MultiActionController{

   public ModelAndView home(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("user");
      model.addObject("message", "Home");
      return model;
   } 
}

URL映射配置文件

<bean class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
   <property name="mappings">
      <value>
         index.html=userController
      </value>
   </property>
</bean>
<bean id="userController" class="org.springframework.web.servlet.mvc.ParameterizableViewController">
   <property name="viewName" value="index"/>
</bean>

对于/index.html请求，DispatcherServlet会将请求转发到UserController控制器，并将viewName设置为index.jsp。

Spring MVC可参数化的视图控制器样例

创建一个名称为 ParameterizableViewController 的动态WEB项目
在 com.yiibai.springmvc 包下创建一个Java类UserController
在jsp子文件夹下创建一个视图文件：index.jsp

UserController.java

package com.yiibai.springmvc;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.multiaction.MultiActionController;

public class UserController extends MultiActionController{

   public ModelAndView home(HttpServletRequest request,
      HttpServletResponse response) throws Exception {
      ModelAndView model = new ModelAndView("user");
      model.addObject("message", "Home");
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