Spring Boot导出EXCEL 文件

本文介绍: java导出excel

主要功能:实现java导出excel到本地

JDK版本：openJDK 20.0.1

依赖pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.2.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.joker</groupId>
    <artifactId>export</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>export</name>
    <description>export</description>
    <properties>
        <java.version>17</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>


        <dependency>
            <groupId>cn.afterturn</groupId>
            <artifactId>easypoi-base</artifactId>
            <version>4.1.0</version>
        </dependency>
        <dependency>
            <groupId>cn.afterturn</groupId>
            <artifactId>easypoi-web</artifactId>
            <version>4.1.0</version>
        </dependency>
        <dependency>
            <groupId>cn.afterturn</groupId>
            <artifactId>easypoi-annotation</artifactId>
            <version>4.1.0</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

主要核心代码

package com.joker.export.Controller;

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.fasterxml.jackson.databind.ObjectMapper;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import java.io.*;
import java.util.Iterator;
import java.util.List;

import java.util.Map;

@RestController
public class ExportExcelController {

    @RequestMapping("/")
    public String home(){
        System.out.println("hello world");
        return "Hello World for Spring Boot by Joker！";
    }
    @RequestMapping("/Export2Excel")
    public String Export2Excel() throws IOException {
        // you should get the filename from the input data
        String filename = "ExportDataByJoker"  +".xlsx";


        // Parse the JSON string into a JSON object.
        String jsonData = "[{"ZHC_ZZ":"20001118","ZHR_ID_JD":"20001118","ZHC_ZZ_DESC":"","ZHC_ZZ_LEVEL":"21","ZHC_ZZ_LEVEL_DESC":"二级部门","ZHC_PLAN":0,"ZHC_PLAN_ACTUAL":0,"ZHC_PLAN_AVAILABLE_AC":0,"ZHC_PLAN_RATE":0.0000,"ZHC_PLAN_RATE_CHAR":"","ZHC_PLAN_LOCK":0,"ZHC_PLAN_RELEASE":0,"ZHC_PLAN_AVAILABLE_AD":0,"ZHC_FREEZE":"","ZORG_FULLNAME":""},{"ZHC_ZZ":"20001342","ZHR_ID_JD":"20001342","ZHC_ZZ_DESC":"测试组织20230915","ZHC_ZZ_LEVEL":"21","ZHC_ZZ_LEVEL_DESC":"二级部门","ZHC_PLAN":0,"ZHC_PLAN_ACTUAL":0,"ZHC_PLAN_AVAILABLE_AC":0,"ZHC_PLAN_RATE":0.0000,"ZHC_PLAN_RATE_CHAR":"","ZHC_PLAN_LOCK":0,"ZHC_PLAN_RELEASE":0,"ZHC_PLAN_AVAILABLE_AD":0,"ZHC_FREEZE":"","ZORG_FULLNAME":"华中区\/测试组织20230915"},{"ZHC_ZZ":"10000127","ZHR_ID_JD":"01010603","ZHC_ZZ_DESC":"长沙区","ZHC_ZZ_LEVEL":"21","ZHC_ZZ_LEVEL_DESC":"二级部门","ZHC_PLAN":0,"ZHC_PLAN_ACTUAL":374,"ZHC_PLAN_AVAILABLE_AC":-374,"ZHC_PLAN_RATE":0.0000,"ZHC_PLAN_RATE_CHAR":"","ZHC_PLAN_LOCK":0,"ZHC_PLAN_RELEASE":2,"ZHC_PLAN_AVAILABLE_AD":-372,"ZHC_FREEZE":"","ZORG_FULLNAME":"华中区\/长沙区"},{"ZHC_ZZ":"10006019","ZHR_ID_JD":"0154","ZHC_ZZ_DESC":"南昌区","ZHC_ZZ_LEVEL":"21","ZHC_ZZ_LEVEL_DESC":"二级部门","ZHC_PLAN":0,"ZHC_PLAN_ACTUAL":2,"ZHC_PLAN_AVAILABLE_AC":-2,"ZHC_PLAN_RATE":0.0000,"ZHC_PLAN_RATE_CHAR":"","ZHC_PLAN_LOCK":0,"ZHC_PLAN_RELEASE":1,"ZHC_PLAN_AVAILABLE_AD":-1,"ZHC_FREEZE":"","ZORG_FULLNAME":"华中区\/南昌区"},{"ZHC_ZZ":"10000009","ZHR_ID_JD":"01010602","ZHC_ZZ_DESC":"武汉区","ZHC_ZZ_LEVEL":"21","ZHC_ZZ_LEVEL_DESC":"二级部门","ZHC_PLAN":0,"ZHC_PLAN_ACTUAL":333,"ZHC_PLAN_AVAILABLE_AC":-333,"ZHC_PLAN_RATE":0.0000,"ZHC_PLAN_RATE_CHAR":"","ZHC_PLAN_LOCK":0,"ZHC_PLAN_RELEASE":3,"ZHC_PLAN_AVAILABLE_AD":-330,"ZHC_FREEZE":"","ZORG_FULLNAME":"华中区\/武汉区"},{"ZHC_ZZ":"20000365","ZHR_ID_JD":"20000365","ZHC_ZZ_DESC":"电商部","ZHC_ZZ_LEVEL":"21","ZHC_ZZ_LEVEL_DESC":"二级部门","ZHC_PLAN":0,"ZHC_PLAN_ACTUAL":36,"ZHC_PLAN_AVAILABLE_AC":-36,"ZHC_PLAN_RATE":0.0000,"ZHC_PLAN_RATE_CHAR":"","ZHC_PLAN_LOCK":0,"ZHC_PLAN_RELEASE":0,"ZHC_PLAN_AVAILABLE_AD":-36,"ZHC_FREEZE":"","ZORG_FULLNAME":"华中区\/电商部"},{"ZHC_ZZ":"20000366","ZHR_ID_JD":"20000366","ZHC_ZZ_DESC":"业务支持部","ZHC_ZZ_LEVEL":"21","ZHC_ZZ_LEVEL_DESC":"二级部门","ZHC_PLAN":0,"ZHC_PLAN_ACTUAL":28,"ZHC_PLAN_AVAILABLE_AC":-28,"ZHC_PLAN_RATE":0.0000,"ZHC_PLAN_RATE_CHAR":"","ZHC_PLAN_LOCK":0,"ZHC_PLAN_RELEASE":1,"ZHC_PLAN_AVAILABLE_AD":-27,"ZHC_FREEZE":"","ZORG_FULLNAME":"华中区\/业务支持部"},{"ZHC_ZZ":"20000367","ZHR_ID_JD":"20000367","ZHC_ZZ_DESC":"市场品牌部","ZHC_ZZ_LEVEL":"21","ZHC_ZZ_LEVEL_DESC":"二级部门","ZHC_PLAN":0,"ZHC_PLAN_ACTUAL":15,"ZHC_PLAN_AVAILABLE_AC":-15,"ZHC_PLAN_RATE":0.0000,"ZHC_PLAN_RATE_CHAR":"","ZHC_PLAN_LOCK":0,"ZHC_PLAN_RELEASE":0,"ZHC_PLAN_AVAILABLE_AD":-15,"ZHC_FREEZE":"","ZORG_FULLNAME":"华中区\/市场品牌部"},{"ZHC_ZZ":"20000559","ZHR_ID_JD":"20000559","ZHC_ZZ_DESC":"成本中心测试","ZHC_ZZ_LEVEL":"21","ZHC_ZZ_LEVEL_DESC":"二级部门","ZHC_PLAN":0,"ZHC_PLAN_ACTUAL":0,"ZHC_PLAN_AVAILABLE_AC":0,"ZHC_PLAN_RATE":0.0000,"ZHC_PLAN_RATE_CHAR":"","ZHC_PLAN_LOCK":0,"ZHC_PLAN_RELEASE":0,"ZHC_PLAN_AVAILABLE_AD":0,"ZHC_FREEZE":"","ZORG_FULLNAME":"华中区\/成本中心测试"}]";

        // Convert JSON to a list of maps
        ObjectMapper mapper = new ObjectMapper();
        List<Map<String, Object>> dataList = mapper.readValue(jsonData, new TypeReference<List<Map<String, Object>>>() {});

        // Create an Excel workbook
        Workbook workbook = new XSSFWorkbook();

        // Create a sheet
        Sheet sheet = workbook.createSheet("Sheet1");

        // Create a header row
        Row headerRow = sheet.createRow(0);

        // Get the column names from the first map entry,
        // get the column names from the input data is better
        Map<String, Object> firstData = dataList.get(0);
        Iterator<Map.Entry<String, Object>> iterator = firstData.entrySet().iterator();
        int columnCount = 0;
        while (iterator.hasNext()) {
            Map.Entry<String, Object> entry = iterator.next();
            String columnName = entry.getKey();
            headerRow.createCell(columnCount).setCellValue(columnName);
            columnCount++;
        }

        // Create data rows
        int rowIndex = 1;
        for (Map<String, Object> data : dataList) {
            Row dataRow = sheet.createRow(rowIndex);
            int dataColumnCount = 0;
            for (Map.Entry<String, Object> entry : data.entrySet()) {
                Object value = entry.getValue();
                Cell cell = dataRow.createCell(dataColumnCount);
                if (value instanceof String) {
                    cell.setCellValue((String) value);
                } else if (value instanceof Number) {
                    cell.setCellValue(((Number) value).doubleValue());
                } else {
                    cell.setCellValue(value.toString());
                }
                dataColumnCount++;
            }
            rowIndex++;
        }

        // Auto-size the columns
        for (int i = 0; i < columnCount; i++) {
            sheet.autoSizeColumn(i);
        }

        // Write the workbook to a file
        try (FileOutputStream out = new FileOutputStream(filename)) {
            workbook.write(out);
        }

        // change the return to file stream
        return "download file is ready";

    }
}