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springboot apache.commons 上传和导出csv

上善若水2021-01-14 18:31:39【java技术交流】 5481人已围观

简介csv是一种常用的表格数据,一般相比excel更加高效,在工作中大量使用,最近尝试了下使用commons-csv导出csv文件,我只是搬运工! 准备工作首先搭建一个简单springboot项目

csv是一种常用的表格数据,一般相比excel更加高效,在工作中大量使用,最近尝试了下使用commons-csv导出csv文件,我只是搬运工!

准备工作

首先搭建一个简单springboot项目

<?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>2.4.1</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.my</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>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-csv</artifactId>
            <version>1.8</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

配置文件application.yml

spring:
  mvc:
    view:
      suffix: .html
    static-path-pattern: /**

在static里添加index.html

<!DOCTYPE html>
<html lang="zh-cn">
<head>
    <meta charset="UTF-8">
    <title>测试上传demo</title>
</head>
<body>
<form method="post" enctype="multipart/form-data">
    <input type="file" name="file">
    <input type="submit" value="提交">
</form>
<a href="/uploadCsv?name=中文.jpg">导出csv</a>
</body>
</html>

控制器代码

package com.my.demo.controller;

import com.my.demo.controller.util.CSVUtils;
import org.apache.commons.csv.CSVFormat;
import org.apache.commons.csv.CSVParser;
import org.apache.commons.csv.CSVRecord;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.util.ArrayList;
import java.util.List;

@Controller
public class IndexController {

    @GetMapping("/")
    public String index() {
        return "index";
    }

    @PostMapping("/")
    @ResponseBody
    public List index(@RequestParam(value = "file") MultipartFile file) throws IOException {
        InputStream inputStream = file.getInputStream();
        InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
//        InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "GBK");
        BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
        CSVParser parser = CSVFormat.DEFAULT.parse(bufferedReader);
        List<List<String>> values = new ArrayList<>();
        for (CSVRecord record : parser.getRecords()) {
            List<String> value = new ArrayList<>();
            for (int i = 0; i < record.size(); i++) {
                value.add(record.get(i));
            }
            values.add(value);
        }
        return values;
    }

    @GetMapping("/uploadCsv")
    public String uploadCsv(HttpServletResponse response) throws IOException {
        String[] head ={"头1","头1","头3"};
        List<String[]> values =new ArrayList<>();
        for (int i=0;i<10;i++){
            values.add(new String[]{"php最好的语言"+i, "java天下第一"+i, "python我年轻我骄傲"+i});
        }
        String fileName = "temp";
        File file = CSVUtils.makeTempCSV(fileName, head, values);
        response.setCharacterEncoding("utf-8");
        response.setContentType("multipart/form-data");
        response.setHeader("Content-Disposition", "attachment;fileName=" + fileName +".csv");
        CSVUtils.downloadFile(response, file);
        return null;
    }

}

工具类

产考:https://blog.csdn.net/u013620635/article/details/96877700

package com.my.demo.controller.util;

import org.apache.commons.csv.CSVFormat;
import org.apache.commons.csv.CSVParser;
import org.apache.commons.csv.CSVPrinter;
import org.apache.commons.csv.CSVRecord;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

/**
 * @Author: Denebola
 * @Date: 2019/7/18-16:48
 * @Description: CSV工具类
 **/

public class CSVUtils {
    private static Logger logger = LoggerFactory.getLogger(CSVUtils.class);
    //行尾分隔符定义
    private final static String NEW_LINE_SEPARATOR = "\n";
    //上传文件的存储位置
    private final static String PATH = "E:/blog/";

    /**
     * @return File
     * @Description 创建CSV文件
     * @Param fileName 文件名，head 表头，values 表体
     **/
    public static File makeTempCSV(String fileName, String[] head, List<String[]> values) throws IOException {
//        创建文件
        File file = File.createTempFile(fileName, ".csv", new File(PATH));
        CSVFormat formator = CSVFormat.DEFAULT.withRecordSeparator(NEW_LINE_SEPARATOR);

        BufferedWriter bufferedWriter =
                new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file), "UTF-8"));
        CSVPrinter printer = new CSVPrinter(bufferedWriter, formator);

//        写入表头
        printer.printRecord(head);

//        写入内容
        for (String[] value : values) {
            printer.printRecord(value);
        }

        printer.close();
        bufferedWriter.close();
        return file;
    }

    /**
     * @return boolean
     * @Description 下载文件
     * @Param response，file
     **/
    public static boolean downloadFile(HttpServletResponse response, File file) {
        FileInputStream fileInputStream = null;
        BufferedInputStream bufferedInputStream = null;
        OutputStream os = null;
        try {
            fileInputStream = new FileInputStream(file);
            bufferedInputStream = new BufferedInputStream(fileInputStream);
            os = response.getOutputStream();
            //MS产本头部需要插入BOM
            //如果不写入这几个字节，会导致用Excel打开时，中文显示乱码
            os.write(new byte[]{(byte) 0xEF, (byte) 0xBB, (byte) 0xBF});
            byte[] buffer = new byte[1024];
            int i = bufferedInputStream.read(buffer);
            while (i != -1) {
                os.write(buffer, 0, i);
                i = bufferedInputStream.read(buffer);
            }
            return true;
        } catch (IOException e) {
            e.printStackTrace();

        } finally {
            //关闭流
            if (os != null) {
                try {
                    os.flush();
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (bufferedInputStream != null) {
                try {
                    bufferedInputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (fileInputStream != null) {
                try {
                    fileInputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            file.delete();
        }
        return false;
    }

    /**
     * @return File
     * @Description 上传文件
     * @Param multipartFile
     **/
    public static File uploadFile(MultipartFile multipartFile) {
        String path = PATH + multipartFile.getOriginalFilename();
        try {
            File file = new File(path);
            if (!file.getParentFile().exists()) {
                file.getParentFile().mkdirs();
            }
            multipartFile.transferTo(file);
            logger.info("上传文件成功，文件名===>" + multipartFile.getOriginalFilename() + ", 路径===>" + file.getPath());
            return file;
        } catch (IOException e) {
            logger.error("上传文件失败" + e.getMessage(), e);
            return null;
        }

    }

    /**
     * @return List<List < String>>
     * @Description 读取CSV文件的内容（不含表头）
     * @Param filePath 文件存储路径，colNum 列数
     **/
    public static List<List<String>> readCSV(String filePath, int colNum) {
        BufferedReader bufferedReader = null;
        InputStreamReader inputStreamReader = null;
        FileInputStream fileInputStream = null;

        try {
            fileInputStream = new FileInputStream(filePath);
            inputStreamReader = new InputStreamReader(fileInputStream);
            bufferedReader = new BufferedReader(inputStreamReader);

            CSVParser parser = CSVFormat.DEFAULT.parse(bufferedReader);
//          表内容集合，外层List为行的集合，内层List为字段集合
            List<List<String>> values = new ArrayList<>();
            int rowIndex = 0;

            for (CSVRecord record : parser.getRecords()) {
//              跳过表头
                if (rowIndex == 0) {
                    rowIndex++;
                    continue;
                }
//              每行的内容
                List<String> value = new ArrayList<>(colNum + 1);
                for (int i = 0; i < colNum; i++) {
                    value.add(record.get(i));
                }
                values.add(value);
                rowIndex++;
            }
            return values;
        } catch (IOException e) {
            logger.error("解析CSV内容失败" + e.getMessage(), e);
        } finally {
            //关闭流
            if (bufferedReader != null) {
                try {
                    bufferedReader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (inputStreamReader != null) {
                try {
                    inputStreamReader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (fileInputStream != null) {
                try {
                    fileInputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return null;
    }
}

最后看看结果

下载

导出

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