springboot-src/main/resource-资源文件读取下载

springboot-src/main/resource-资源文件读取下载

一、读取 src/main/resource 目录下的文件

写的是单元测试，项目上用代码一样。

目录结构

java

    ResourceUtilsTest.java

resources

    text.txt


ResourceUtilsTest.java 代码


package com.mytest;

import org.junit.Test;

import org.springframework.core.io.ClassPathResource;

import org.springframework.core.io.Resource;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;


public class ResourceUtilTest {

    @Test

    public void testReadFile() throws IOException {

        Resource resource = new ClassPathResource("test.txt");

        try(InputStream is = resource.getInputStream()){

            try(InputStreamReader isr = new InputStreamReader(is)) {

                BufferedReader br = new BufferedReader(isr);

                String data = null;

                while ((data = br.readLine()) != null) {

                    System.out.println(data);

                }

                br.close();

            }

        }

    }

}

二、springboot下载资源文件

 @GetMapping(value = "/testdownload")

    public void priceTemplateDownload(HttpServletRequest request, HttpServletResponse response){

        try {

            String path = "test.txt";

            ClassPathResource resource = new ClassPathResource(path)

            // 读到流中

            try(InputStream inputStream = resource.getInputStream()) {

                response.reset();

                response.setContentType("application/octet-stream");

                String filename = new File(path).getName();

                response.addHeader("Content-Disposition"

                        , "attachment; filename=" + URLEncoder.encode(filename, "UTF-8"));

                ServletOutputStream outputStream = response.getOutputStream();

                byte[] b = new byte[1024];

                int len;

                //从输入流中读取一定数量的字节，并将其存储在缓冲区字节数组中，读到末尾返回-1

                while ((len = inputStream.read(b)) > 0) {

                    outputStream.write(b, 0, len);

                }

            }

        }catch (Exception ex){

            System.out.println(ex.toString());

        }

    }