EasyExcel使用的正确姿势，工具类封装

项目中很可能用到导出excel文件的需求。

easyexcel代码量较小，使用简单，而且性能较佳，是一个非常好的选择。

源码地址：https://github.com/alibaba/easyexcel

工具类使用方法很简单：

1、maven依赖

<!-- https://mvnrepository.com/artifact/com.alibaba/easyexcel -->
<dependency><groupId>com.alibaba</groupId><artifactId>easyexcel</artifactId><version>1.1.1</version>
</dependency>

2、工具类

package com.chujianyun.libs.excelpdf.easyexcel;import com.alibaba.excel.ExcelWriter;
import com.alibaba.excel.metadata.BaseRowModel;
import com.alibaba.excel.metadata.Sheet;
import com.alibaba.excel.support.ExcelTypeEnum;
import org.apache.commons.io.Charsets;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.lang.Validate;
import org.apache.commons.lang3.ObjectUtils;import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;/*** EasyExcel工具类** @author liuwangyanghdu@163.com* @date 2018/11/19*/
public class EasyExcelUtil {/*** 下载EXCEL文件2007版本** @throws IOException IO异常*/public static void exportExcel2007Format(EasyExcelParams excelParams) throws IOException {exportExcel(excelParams, ExcelTypeEnum.XLSX);}/*** 下载EXCEL文件2003版本** @throws IOException IO异常*/public static void exportExcel2003Format(EasyExcelParams excelParams) throws IOException {exportExcel(excelParams, ExcelTypeEnum.XLS);}/*** 根据参数和版本枚举导出excel文件** @param excelParams 参数实体* @param typeEnum    excel类型枚举* @throws IOException*/private static void exportExcel(EasyExcelParams excelParams, ExcelTypeEnum typeEnum) throws IOException {Validate.isTrue(excelParams.isValid(), "easyExcel params is not valid");HttpServletResponse response = excelParams.getResponse();ServletOutputStream out = response.getOutputStream();ExcelWriter writer = new ExcelWriter(out, typeEnum, excelParams.isNeedHead());prepareResponds(response, excelParams.getExcelNameWithoutExt(), typeEnum);Sheet sheet1 = new Sheet(1, 0, excelParams.getDataModelClazz());if (StringUtils.isNotBlank(excelParams.getSheetName())) {sheet1.setSheetName(excelParams.getSheetName());}writer.write(excelParams.getData(), sheet1);writer.finish();out.flush();}/*** 将文件输出到浏览器（导出文件）* @param response 响应* @param fileName 文件名（不含拓展名）* @param typeEnum excel类型*/private static void prepareResponds(HttpServletResponse response, String fileName, ExcelTypeEnum typeEnum) {String fileName2Export = new String((fileName).getBytes(Charsets.UTF_8), Charsets.ISO_8859_1);response.setContentType("multipart/form-data");response.setHeader("Content-disposition", "attachment;filename=" + fileName2Export + typeEnum.getValue());}public static class EasyExcelParams {/*** excel文件名（不带拓展名)*/private String excelNameWithoutExt;/*** sheet名称*/private String sheetName;/*** 是否需要表头*/private boolean needHead = true;/*** 数据*/private List<? extends BaseRowModel> data;/*** 数据模型类型*/private Class<? extends BaseRowModel> dataModelClazz;/*** 响应*/private HttpServletResponse response;public EasyExcelParams() {}/*** 检查不允许为空的属性*/public boolean isValid() {return ObjectUtils.allNotNull(excelNameWithoutExt, data, dataModelClazz, response);}public String getExcelNameWithoutExt() {return excelNameWithoutExt;}public void setExcelNameWithoutExt(String excelNameWithoutExt) {this.excelNameWithoutExt = excelNameWithoutExt;}public String getSheetName() {return sheetName;}public void setSheetName(String sheetName) {this.sheetName = sheetName;}public boolean isNeedHead() {return needHead;}public void setNeedHead(boolean needHead) {this.needHead = needHead;}public List<? extends BaseRowModel> getData() {return data;}public void setData(List<? extends BaseRowModel> data) {this.data = data;}public Class<? extends BaseRowModel> getDataModelClazz() {return dataModelClazz;}public void setDataModelClazz(Class<? extends BaseRowModel> dataModelClazz) {this.dataModelClazz = dataModelClazz;}public HttpServletResponse getResponse() {return response;}public void setResponse(HttpServletResponse response) {this.response = response;}}}

其中数据模型的范例：

package com.chujianyun.libs.excelpdf.easyexcel;import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.metadata.BaseRowModel;/*** @author liuwangyanghdu@163.com 明明如月* @date 2018/11/19*/
public class ExportInfo extends BaseRowModel {@ExcelProperty(value = "姓名" ,index = 0)private String name;@ExcelProperty(value = "年龄",index = 1)private String age;@ExcelProperty(value = "邮箱",index = 2)private String email;@ExcelProperty(value = "地址",index = 3)private String address;public String getName() {return name;}public void setName(String name) {this.name = name;}public String getAge() {return age;}public void setAge(String age) {this.age = age;}public String getEmail() {return email;}public void setEmail(String email) {this.email = email;}public String getAddress() {return address;}public void setAddress(String address) {this.address = address;}
}

使用时构造参数对象，调用导出excel的函数即可。

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