利用orm思想实现java读取Excel文件

本博文使用工具https://github.com/nvenky/excel-parser，其思想类似orm，数据源来于Excel文件，Excel文件
中的每一行对应java中的类实例，此工具使用注解绑定Excel每一行的中某列对应类的哪个属性（Hibernate也是这样做的，不过根据名字yin’s， myabtis使用的是配置的方式）。

拿某公司的差表规则Excel文件举例：

我们可以实现其对应的java类：

package com.beaver.drools.exampl.travel.rule;import org.javafunk.excelparser.annotations.ExcelField;
import org.javafunk.excelparser.annotations.ExcelObject;
import org.javafunk.excelparser.annotations.ParseType;/*** Created by beaver on 2017/5/20.*/
@ExcelObject(parseType = ParseType.ROW, start = 2, end = 61)
public class TravelRule {//公司名称@ExcelField(position = 1)private String companyName;//费用类型@ExcelField(position = 2)private String expenseType;//规则应用场景@ExcelField(position = 3)private String applyPoint;//规则结果@ExcelField(position = 4)private String ruleAction;//规则内容@ExcelField(position = 7)private String rule;//提示信息@ExcelField(position = 9)private String alertMessage;//规则ID@ExcelField(position = 11)private String ruleId;//解析出的drools规则内容private String droolsRule;public String getCompanyName() {return companyName;}public void setCompanyName(String companyName) {this.companyName = companyName;}public String getExpenseType() {return expenseType;}public void setExpenseType(String expenseType) {this.expenseType = expenseType;}public String getRule() {return rule;}public void setRule(String rule) {this.rule = rule;}public String getApplyPoint() {return applyPoint;}public void setApplyPoint(String applyPoint) {this.applyPoint = applyPoint;}public String getRuleAction() {return ruleAction;}public void setRuleAction(String ruleAction) {this.ruleAction = ruleAction;}public String getAlertMessage() {return alertMessage;}public void setAlertMessage(String alertMessage) {this.alertMessage = alertMessage;}public String getRuleId() {return ruleId;}public void setRuleId(String ruleId) {this.ruleId = ruleId;}public String getDroolsRule() {return droolsRule;}public void setDroolsRule(String droolsRule) {this.droolsRule = droolsRule;}@Overridepublic String toString() {return "TravelRule{" +"companyName='" + companyName + '\'' +", expenseType='" + expenseType + '\'' +", applyPoint='" + applyPoint + '\'' +", ruleAction='" + ruleAction + '\'' +", rule='" + rule + '\'' +", alertMessage='" + alertMessage + '\'' +", ruleId='" + ruleId + '\'' +", droolsRule='" + droolsRule + '\'' +'}';}
}

利用此工具转换：

在package com.beaver.drools.exampl.travel.rule;import com.beaver.drools.util.KieSessionUtil;
import com.google.gson.Gson;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.javafunk.excelparser.SheetParser;
import org.kie.api.io.ResourceType;import java.io.IOException;
import java.io.InputStream;
import java.util.*;
import java.util.stream.Collectors;/*** Created by beaver on 2017/5/20.*/
public class TravleRuelTest {static String packageName = "package com.beaver.drools.exampl.travel.rule";static List<String> importPackages = Arrays.asList("import java.math.*", "import com.beaver.drools.common.model.*");static String sheetName = "工作表1";static String fileName = "腾讯差标规则1.xlsx";static String objectType = "MatchInvoiceTravelRuleRequestDto";static String objectVar = "$invoice";static String resultPropertyName = "result";static String alertMessagePropertyName = "remarkMessage";//规则内容属性别名，如{EXP_LEVEL}IN[一般员工]，EXP_LEVEL 可以起别名static Map<String, String> rulePropertyNameAlias = new HashMap<>();static {rulePropertyNameAlias.put("\\{.*LEVEL.*\\}", "EXPENSE_LEVEL");rulePropertyNameAlias.put("\\{.*LOCATION.*\\}", "city");rulePropertyNameAlias.put("\\{.*FEE.*\\}", "INVOICE_AMOUNT");rulePropertyNameAlias.put("\\{.*DAYS.*\\}", "days");}public static void main(String[] args) throws IOException {//Get the sheet using POI API.SheetParser parser = new SheetParser();InputStream inputStream = TravleRuelTest.class.getClassLoader().getResourceAsStream(fileName);Sheet sheet = new XSSFWorkbook(inputStream).getSheet(sheetName);//Invoke the Sheet parser.List<TravelRule> entityList = parser.createEntity(sheet, TravelRule.class, t -> t.printStackTrace());//entityList = entityList.stream().filter(t -> t.getCompanyName() != null && !t.getCompanyName().isEmpty()).collect(Collectors.toList());System.out.println(new Gson().toJson(entityList));}}

输出内容：

[{"companyName": "微民","expenseType": "住宿费","applyPoint": "ER_SUBMIT","ruleAction": "REJECT","rule": "{EXP_LEVEL}IN[1] AND {ER_EXP_FEE}>{ER_DAYS} *600","alertMessage": "您的房费高于公司标准","ruleId": "8a24ef78-d1c4-4c7c-924f-f199fa3c5eb1"},{"companyName": "微民","expenseType": "住宿费","applyPoint": "ER_SUBMIT","ruleAction": "REJECT","rule": "{EXP_LEVEL}IN[2] AND {ER_EXP_FEE}>{ER_DAYS}*700","alertMessage": "您的房费高于公司标准","ruleId": "f9b17610-7917-4f71-b369-602224fdd20d"},{"companyName": "微民","expenseType": "住宿费","applyPoint": "ER_SUBMIT","ruleAction": "REJECT","rule": "{EXP_LEVEL}IN[3] AND {ER_EXP_FEE}>{ER_DAYS}*800","alertMessage": "您的房费高于公司标准","ruleId": "128e621a-832a-4876-81c8-a5a9624b6ca7"},{"companyName": "微民","expenseType": "差旅补贴","applyPoint": "ER_SUBMIT","ruleAction": "REJECT","rule": "{ER_LOCATION_COUNTRY}IN[中国] AND {ER_EXP_FEE}>{ER_DAYS}*140","alertMessage": "您的补贴高于公司标准","ruleId": "06d1afc9-4a0e-4ad6-b0b1-01af068997fe"},{"companyName": "微民","expenseType": "差旅补贴","applyPoint": "ER_SUBMIT","ruleAction": "REJECT","rule": "{ER_LOCATION_COUNTRY}NOT IN[中国] AND {ER_EXP_FEE}>{ER_DAYS}*400","alertMessage": "您的补贴高于公司标准","ruleId": "922d99ff-c5bc-4f26-a365-d8b6e8a9a999"},{"companyName": "腾南","expenseType": "住宿费","applyPoint": "ER_SUBMIT","ruleAction": "REJECT","rule": "{EXP_LEVEL}IN[一般员工] AND {ER_EXP_FEE}>{ER_DAYS}*400","alertMessage": "您的房费高于公司标准","ruleId": "7c170ce0-080e-499a-9046-0dc7d226b86c"},{"companyName": "腾南","expenseType": "住宿费","applyPoint": "ER_SUBMIT","ruleAction": "REJECT","rule": "{EXP_LEVEL}IN[一般员工] AND {ER_LOCATION}NOT IN[北京/上海/深圳] AND {ER_EXP_FEE}>{ER_DAYS}*300","alertMessage": "您的房费高于公司标准","ruleId": "6135e677-867b-41ed-8d00-7512b5ec5c2a"},{"companyName": "腾南","expenseType": "住宿费","applyPoint": "ER_SUBMIT","ruleAction": "REJECT","rule": "{EXP_LEVEL}IN[总监] AND {ER_EXP_FEE}>{ER_DAYS}*550","alertMessage": "您的房费高于公司标准","ruleId": "636ebfda-6d78-4ec7-a441-234ff931fa57"},{"companyName": "腾南","expenseType": "住宿费","applyPoint": "ER_SUBMIT","ruleAction": "REJECT","rule": "{EXP_LEVEL}IN[总监] AND {ER_LOCATION}NOT IN[北京/上海/深圳] AND {ER_EXP_FEE}>{ER_DAYS}*400","alertMessage": "您的房费高于公司标准","ruleId": "b236a113-e547-4f65-9ddc-3b9549efa6ce"},{"companyName": "腾南","expenseType": "住宿费","applyPoint": "ER_SUBMIT","ruleAction": "REJECT","rule": "{EXP_LEVEL}IN[总裁] AND {ER_EXP_FEE}>{ER_DAYS}*700","alertMessage": "您的房费高于公司标准","ruleId": "8bb7e480-bf94-4c24-a46e-963ae60bee7e"},{"companyName": "腾南","expenseType": "住宿费","applyPoint": "ER_SUBMIT","ruleAction": "REJECT","rule": "{EXP_LEVEL}IN[总裁] AND {ER_LOCATION}NOT IN[北京/上海/深圳] AND {ER_EXP_FEE}>{ER_DAYS}*500","alertMessage": "您的房费高于公司标准","ruleId": "f74d0d7c-d31d-49d9-84ff-c0889bf37771"},{"companyName": "腾南","expenseType": "差旅补贴","applyPoint": "ER_SUBMIT","ruleAction": "REJECT","rule": "{ER_EXP_FEE}>{ER_DAYS}*80","alertMessage": "您的补贴高于公司标准","ruleId": "154866b0-fdc5-433f-9c3f-640e9a812564"},{"companyName": "腾新","expenseType": "住宿费","applyPoint": "ER_SUBMIT","ruleAction": "REJECT","rule": "{EXP_LEVEL}IN[总裁] AND {ER_EXP_FEE}>{ER_DAYS}*600","alertMessage": "您的房费高于公司标准","ruleId": "e4ece4c7-f9ca-46fc-bb7b-2a4443513daf"},{"companyName": "腾新","expenseType": "住宿费","applyPoint": "ER_SUBMIT","ruleAction": "REJECT","rule": "{EXP_LEVEL}NOT IN[总裁] AND {ER_EXP_FEE}>{ER_DAYS}*500","alertMessage": "您的房费高于公司标准","ruleId": "51768055-8a13-4d44-9c61-e261bcb74149"},{"companyName": "腾新","expenseType": "住宿费","applyPoint": "ER_SUBMIT","ruleAction": "REJECT","rule": "{EXP_LEVEL}NOT IN[总裁] AND {ER_LOCATION}NOT IN[北京/上海/深圳/成都/广州/杭州] AND {ER_EXP_FEE}>{ER_DAYS}*400","alertMessage": "您的房费高于公司标准","ruleId": "0d3f86b6-f937-4544-916d-8fac5061c479"},{"companyName": "腾新","expenseType": "差旅补贴","applyPoint": "ER_SUBMIT","ruleAction": "REJECT","rule": "{ER_EXP_FEE}>{ER_DAYS}*100","alertMessage": "您的补贴高于公司标准","ruleId": "a9c0f423-7880-4f86-a761-ba2f2ec83c66"}
]

excel-parser的具体使用文档见官方地址。不过，此工具利用orm思想大大简化了我们的Excel文件向java实体类转换的工作量，也带有点小瑕疵。不过，知道其背后原理（excel读取，java反射）我们可以自己实现。

感谢作者的小工具

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