使用EasyExcel从Excel表格读取链接地址下载文件

使用easyExcel读取excel表格，再读取excel表格中的链接地址下载文件到本地。

1、引入easyexcel依赖

<dependency>
	   <groupId>com.alibaba</groupId>
	   <artifactId>easyexcel</artifactId>
	   <version>2.1.1</version>
</dependency>

2、新建与excel对应的实体类

import com.alibaba.excel.annotation.ExcelProperty;
import lombok.Data;

@Data
public class ContractData {

    @ExcelProperty("contract_name")
    private String contractName;

    @ExcelProperty("url")
    private String url;
}

3、下载文件到本地

import com.alibaba.excel.EasyExcel;
import org.apache.commons.lang3.StringUtils;

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

public class DownloadFile {

    /**
     * 从网络Url中下载文件
     * @param urlStr
     * @param fileName
     * @param savePath
     * @throws IOException
     */
    public static void downLoadByUrl(String urlStr,String fileName,String savePath) throws IOException{
        URL url = new URL(urlStr);
        HttpURLConnection conn = (HttpURLConnection)url.openConnection();
        //设置超时间为3秒
        conn.setConnectTimeout(5*1000);
        //防止屏蔽程序抓取而返回403错误
        conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
        //得到输入流
        InputStream inputStream = conn.getInputStream();
        //获取自己数组
        byte[] getData = readInputStream(inputStream);
        //文件保存位置
        File saveDir = new File(savePath);
        if(!saveDir.exists()){
            saveDir.mkdir();
        }
        File file = new File(saveDir+File.separator+fileName);
        FileOutputStream fos = new FileOutputStream(file);
        fos.write(getData);
        if(fos!=null){
            fos.close();
        }
        if(inputStream!=null){
            inputStream.close();
        }
        System.out.println("info:"+url+" download success");

    }


    /**
     * 从输入流中获取字节数组
     * @param inputStream
     * @return
     * @throws IOException
     */
    public static  byte[] readInputStream(InputStream inputStream) throws IOException {
        byte[] buffer = new byte[1024];
        int len = 0;
        ByteArrayOutputStream bos = new ByteArrayOutputStream();
        while((len = inputStream.read(buffer)) != -1) {
            bos.write(buffer, 0, len);
        }
        bos.close();
        return bos.toByteArray();
    }

    public static void main(String[] args) {
        try{
            String fileName = "E:/upload/文件名.xls";
            // 读取到的数据
            List<ContractData> list = EasyExcel.read(fileName)
                    .head(ContractData.class)
                    .sheet()
                    .doReadSync();
            for (ContractData data : list) {
            	// 判空
                if (StringUtils.isBlank(data.getUrl())) {
                    continue;
                }
                if (StringUtils.isBlank(data.getContractName())) {
                    continue;
                }
                String url = data.getUrl();
                String name = data.getContractName() + ".pdf";
                downLoadByUrl(url, name, "E:/contract");
            }
        }catch (Exception e) {
            e.printStackTrace();
        }
    }
}

借鉴了其他博主的代码，一时找不到博主地址在哪，请见谅。如有错误之处，请指出，谢谢。