springboot单文件下载和多文件打包下载

package com.qlzx.utils;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

import javax.servlet.http.HttpServletResponse;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**

• 多附件打包下载 可以用
• 单文件下载
• @author Liang Qizhao

*/

@RestController
public class DownloadZip {

@RequestMapping("/down")
public String down(HttpServletResponse response) throws Exception {

	List files = new ArrayList();
	File file1 = new File("C:\\Users\\Liang Qizhao\\Desktop\\劳动合同.doc");
	File file2 = new File("C:\\Users\\Liang Qizhao\\Desktop\\数据库设计.doc");

	files.add(file1);
	files.add(file2);
	downLoadFiles(files, response);

	return "成功";
}

public static HttpServletResponse downLoadFiles(List<File> files, HttpServletResponse response) throws Exception {

	try {
		// List<File> 作为参数传进来，就是把多个文件的路径放到一个list里面
		// 创建一个临时压缩文件

		// 临时文件可以放在CDEF盘中，但不建议这么做，因为需要先设置磁盘的访问权限，最好是放在服务器上，方法最后有删除临时文件的步骤

		String zipFilename = "D:/tempFile.zip";
		File file = new File(zipFilename);
		file.createNewFile();
		if (!file.exists()) {
			file.createNewFile();
		}
		response.reset();
		// response.getWriter()
		// 创建文件输出流
		FileOutputStream fous = new FileOutputStream(file);
		ZipOutputStream zipOut = new ZipOutputStream(fous);
		zipFile(files, zipOut);
		zipOut.close();
		fous.close();
		return downloadZip(file, response);
	} catch (Exception e) {
		e.printStackTrace();
	}
	return response;
}

/**
 * 把接受的全部文件打成压缩包
 * 
 * @param List<File>;
 * @param org.apache.tools.zip.ZipOutputStream
 */
public static void zipFile(List files, ZipOutputStream outputStream) {
	int size = files.size();
	for (int i = 0; i < size; i++) {
		File file = (File) files.get(i);
		zipFile(file, outputStream);
	}
}

/**
 * 根据输入的文件与输出流对文件进行打包
 * 
 * @param File
 * @param org.apache.tools.zip.ZipOutputStream
 */
public static void zipFile(File inputFile, ZipOutputStream ouputStream) {
	try {
		if (inputFile.exists()) {
			if (inputFile.isFile()) {
				FileInputStream IN = new FileInputStream(inputFile);
				BufferedInputStream bins = new BufferedInputStream(IN, 512);
				ZipEntry entry = new ZipEntry(inputFile.getName());
				ouputStream.putNextEntry(entry);
				// 向压缩文件中输出数据
				int nNumber;
				byte[] buffer = new byte[512];
				while ((nNumber = bins.read(buffer)) != -1) {
					ouputStream.write(buffer, 0, nNumber);
				}
				// 关闭创建的流对象
				bins.close();
				IN.close();
			} else {
				try {
					File[] files = inputFile.listFiles();
					for (int i = 0; i < files.length; i++) {
						zipFile(files[i], ouputStream);
					}
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		}
	} catch (Exception e) {
		e.printStackTrace();
	}
}

public static HttpServletResponse downloadZip(File file, HttpServletResponse response) {
	if (file.exists() == false) {
		System.out.println("待压缩的文件目录：" + file + "不存在.");
	} else {
		try {
			// 以流的形式下载文件。
			InputStream fis = new BufferedInputStream(new FileInputStream(file.getPath()));
			byte[] buffer = new byte[fis.available()];
			fis.read(buffer);
			fis.close();
			// 清空response
			response.reset();

			OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
			response.setContentType("application/octet-stream");

			// 如果输出的是中文名的文件，在此处就要用URLEncoder.encode方法进行处理
			response.setHeader("Content-Disposition",
					"attachment;filename=" + new String(file.getName().getBytes("GB2312"), "ISO8859-1"));
			toClient.write(buffer);
			toClient.flush();
			toClient.close();
		} catch (Exception ex) {
			ex.printStackTrace();
		} finally {
			try {
				File f = new File(file.getPath());
				f.delete();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
	return response;
}


@RequestMapping("/downlo")
public void downLoad(HttpServletResponse response){
    String filename="劳动合同.doc";
    String filePath = "C:\\Users\\Liang Qizhao\\Desktop\\" ;
    File file = new File(filePath + "/" + filename);
    if(file.exists()){ //判断文件父目录是否存在
    	try {
		filename = java.net.URLEncoder.encode(filename, "UTF-8");
		filename = new String(filename.getBytes(), "iso-8859-1");
        response.setContentType("application/force-download");
        response.setHeader("Content-Disposition", "attachment;fileName=" + filename);
        
        byte[] buffer = new byte[1024];
        FileInputStream fis = null; //文件输入流
        BufferedInputStream bis = null;
        
        OutputStream os = null; //输出流
       
            os = response.getOutputStream();
            fis = new FileInputStream(file); 
            bis = new BufferedInputStream(fis);
            int i = bis.read(buffer);
            while(i != -1){
                os.write(buffer);
                i = bis.read(buffer);
            }
            bis.close();
            fis.close();
            
        } catch (Exception e) {
            e.printStackTrace();
        }
        System.out.println("----------file download" + filename);
    }
}

}

可以在application.proerties中设置上传文件的大小限制
spring.http.multipart.maxFileSize=200MB
spring.http.multipart.maxRequestSize=200MB