模板

下载后的效果

项目结构

pom

<?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>2.3.1.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>net.sf.jxls</groupId>
            <artifactId>jxls-core</artifactId>
            <version>1.0.3</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

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

</project>

TestController

package com.example.demo;

import net.sf.jxls.transformer.XLSTransformer;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.text.SimpleDateFormat;
import java.util.*;

@RestController
@RequestMapping("/excel")
public class TestController {

    @RequestMapping("/export")
    private void export(HttpServletRequest request, HttpServletResponse response) throws Exception {

        //region 数据源
        List<Model> resultList = new ArrayList<>();

        Model model = new Model();
        model.setCode("01");
        model.setName("测试1");
        resultList.add(model);

        model = new Model();
        model.setCode("02");
        model.setName("测试2");
        resultList.add(model);
        //endregion

        //获得模版
        File directory = new File("src/main/resources/templates");
        String templatePath = directory.getCanonicalPath();
        String templateFile = templatePath + "\template.xls";

        //导出文件名
        SimpleDateFormat simpl = new SimpleDateFormat("yyyyMMddHHmmss");
        String currntTime = simpl.format(new Date());
        String fileName = currntTime + "报表.xls";

        //将结果放入
        Map beans = new HashMap();
        List values = new ArrayList();

        values.add(resultList);
        beans.put("values", values);
        beans.put("title", "测试title");

        //文件名称统一编码格式
        fileName = URLEncoder.encode(fileName, "utf-8");

        //生成的导出文件
        File destFile = File.createTempFile(fileName, ".xls");

        //transformer转到Excel
        XLSTransformer transformer = new XLSTransformer();

        BufferedInputStream bis = null;
        BufferedOutputStream bos = null;
        try {
            //将数据添加到模版中生成新的文件
            transformer.transformXLS(templateFile, beans, destFile.getAbsolutePath());
            //将文件输入
            InputStream inputStream = new FileInputStream(destFile);
            //设置response参数，可以打开下载页面
            response.reset();
            //设置响应文本格式
            response.setContentType("application/vnd.ms-excel;charset=utf-8");
            response.setHeader("Content-Disposition",
                    "attachment;filename=" + new String((fileName + ".xls").getBytes(), "iso-8859-1"));
            //将文件输出到页面
            ServletOutputStream out = response.getOutputStream();
            bis = new BufferedInputStream(inputStream);
            bos = new BufferedOutputStream(out);
            byte[] buff = new byte[2048];
            int bytesRead;
            //读取并写入
            while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {
                bos.write(buff, 0, bytesRead);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            //使用完成后关闭流
            try {
                if (bis != null)
                    bis.close();
                if (bos != null)
                    bos.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

}

model

package com.example.demo;

public class Model {

    private String code;
    private String name;

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

Demo下载