【Spring学习笔记-MVC-2】spring导出Excel

说明：

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1.结合Spring MVC实现Excel导出功能；

2. 在MVC配置文件中配置Excel视图解析器；

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需要的jar包

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以poi开头的jar包都是必须的

web.xml

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<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:/conf/applicationContext.xml</param-value>
</context-param>

<listener>
<listener-clas
s>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

<servlet>
<servlet-name>baobaotao</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>baobaotao</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>

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baobaotao-servlet.xml ==>MVC配置文件

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<?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:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:util="http://www.springframework.org/schema/util"
	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
        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
	<context:component-scan base-package="com.baobaotao.web" />
	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"
		p:prefix="/WEB-INF/views/" p:suffix=".jsp" />
	
		<!-- Excel及PDF视图解析器配置 -->
	<bean class="org.springframework.web.servlet.view.BeanNameViewResolver"
		p:order="10" />
	<bean id="userListExcel" class="com.baobaotao.web.UserListExcelView" />
	<!-- <bean id="userListPdf" class="com.baobaotao.web.UserListPdfView" /> -->
</beans>

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说明：Excel视图对应的视图解析器为：BeanNameViewResolver，即根据bean的名称来解析视图，解析到的视图实际上

是一个bean，即上面的<bean id="userListExcel" class="com.baobaotao.web.UserListExcelView" />；

UserController.java

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package com.baobaotao.web;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.List;
import javax.validation.Valid;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.validation.BindingResult;
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;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;
import com.baobaotao.UserService;
import com.baobaotao.domain.User;
@Controller
@RequestMapping("/user")
public class UserController {
	
	@RequestMapping(value = "/showUserListByXls")
	public String showUserListInExcel(ModelMap mm) {
		Calendar calendar = new GregorianCalendar();
		List<User> userList = new ArrayList<User>();
		User user1 = new User();
		user1.setUserName("tom");
		user1.setRealName("汤姆");
		calendar.set(1980, 1, 1);
		user1.setBirthday(calendar.getTime());
		
		User user2 = new User();
		user2.setUserName("john");
		user2.setRealName("约翰");
		user2.setBirthday(calendar.getTime());
		
		userList.add(user1);
		userList.add(user2);
		mm.addAttribute("userList", userList);
		return "userListExcel";
	}
}

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说明：return "userListExcel";

视图解析器BeanNameViewResolver根据返回值userListExcel解析bean名称为userListExcel的bean；

UserListExcelView.java

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package com.baobaotao.web;
import java.util.List;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.lang.time.DateFormatUtils;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.view.document.AbstractExcelView;
import com.baobaotao.domain.User;
public class UserListExcelView extends AbstractExcelView {
	
	@Override
	protected void buildExcelDocument(Map<String, Object> model,
			HSSFWorkbook workbook, HttpServletRequest request,
			HttpServletResponse response) throws Exception {		
		response.setHeader("Content-Disposition", "inline; filename="+ 
				new String("用户列表".getBytes(), "iso8859-1"));    //iso8899-1：解决Excel文档名称出现中文乱码的问题 
		List<User> userList = (List<User>) model.get("userList");
		
		HSSFSheet sheet = workbook.createSheet("users");
		HSSFRow header = sheet.createRow(0);   //第0行
		for(int i=0;i<3;i++){
			header.createCell((short) i);
			sheet.getRow(0).getCell((short)i).setEncoding(HSSFCell.ENCODING_UTF_16);  //解决Excel单元格出现中文乱码的问题
			sheet.getRow(0).getCell((short)i).setCellValue((i==0)?"账号":((i==1)?"姓名":"生日"));
		}
		
		int rowNum = 1;
		for (int i=0;i<userList.size();i++) {
			HSSFRow row = sheet.createRow(rowNum++);  //创建行
			User user = userList.get(i);      
			
			row.createCell((short) 0).setCellValue(user.getUserName());	
			
			row.createCell((short) 1);
			row.getCell((short)1).setEncoding(HSSFCell.ENCODING_UTF_16);  //解决Excel单元格出现中文乱码的问题
			row.getCell((short)1).setCellValue(user.getRealName());
			
			String createDate = DateFormatUtils.format(user.getBirthday(),
					"yyyy-MM-dd");
			row.createCell((short) 2).setCellValue(createDate);
		}
	}
}

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访问：

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在浏览器中输入：http://localhost:8080/springQs/user/showUserListByXls 

执行流程如下：

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1. user/showUserListByXls 请求到UserController.java类中的public String showUserListInExcel(ModelMap mm)方法；

2. 方法 String showUserListInExcel(ModelMap mm)显示的将userList添加到模型属性中，即：mm.addAttribute("userList", userList);

3. showUserListInExcel方法返回“userListExcel”，即：return "userListExcel";

4. 视图解析器BeanNameViewResolver：

<bean class="org.springframework.web.servlet.view.BeanNameViewResolver"
		p:order="10" />

根据返回值userListExcel找到名称为userListExcel的bean，即：

<bean id="userListExcel" class="com.baobaotao.web.UserListExcelView" />

5. UserListExcelView.java类实现了AbstractExcelView类中的buildExcelDocument接口，

因此会生成Excel文档；

结果

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会出现提示下载Excel，打开之后：

 

来自为知笔记(Wiz)