下载任意类型文件

下载任意类型文件

package com.example.jpame.controller;


import lombok.SneakyThrows;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpRequest;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URI;
import java.net.URLEncoder;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;

@RestController
public class HttpTestController {

    @SneakyThrows
    @RequestMapping(value = "/down", method = RequestMethod.GET, produces = "application/json;charset=UTF-8")
    public String downExcel(HttpServletResponse response)  {
        LocalDate end = LocalDate.now();
        LocalDate start = end.minusDays(14);
        String filename = "稿源抓取周报-" + end.format(DateTimeFormatter.ISO_DATE) + ".pdf";
//        String filepath = "files/" + filename;
        String filepath = "C:\\Users\\MING\\Desktop\\文件分享\\Java开发常见错误.pdf";
//        writeExcelFile(start, end, filepath);
        // 如果文件名不为空，则进行下载
        if (filename != null) {
            File file = new File(filepath);
            // 如果文件存在，则进行下载
            if (file.exists()) {
                // 配置文件下载
                response.setHeader("content-type", "application/octet-stream");
                response.setContentType("application/octet-stream");
                // 下载文件能正常显示中文
                response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(filename, "UTF-8"));
                // 实现文件下载
                byte[] buffer = new byte[1024];
                FileInputStream fis = null;
                BufferedInputStream bis = null;
                try {
                    fis = new FileInputStream(file);
                    bis = new BufferedInputStream(fis);
                    OutputStream os = response.getOutputStream();
                    int i = bis.read(buffer);
                    while (i != -1) {
                        os.write(buffer, 0, i);
                        i = bis.read(buffer);
                    }
                    System.out.println("Download  successfully!");
                    return "successfully";

                } catch (Exception e) {
                    System.out.println("Download  failed!");
                    return "failed";

                } finally {
                    if (bis != null) {
                        try {
                            bis.close();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }
                    if (fis != null) {
                        try {
                            fis.close();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }
                }
            }
        }
        return "";
    }

}