ruoyi-springboot通过接口下载文件配置

package com.ruoyi.web.controller.groundwater.monitor;

import cn.hutool.core.io.file.FileReader;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.ruoyi.common.constant.BaseConstant;
import com.ruoyi.common.core.domain.AjaxResult;
import com.ruoyi.common.utils.DownloadFileNotFoundException;
import com.ruoyi.common.utils.MissingRequestParamException;
import com.ruoyi.common.utils.file.FileUtils;
import com.ruoyi.system.domain.groundwater.BzSiteImportTemplate;
import com.ruoyi.system.service.groundwater.IBzSiteImportTemplateService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.Map;

/**
 * <p>
 *     文件下载通用前端控制器
 * </p>
 *
 * @author 
 * @since 2021-8-27 16:01:36
 */
@RestController
@RequestMapping("/common/fileDownload")
public class FileDownloadController {

    @Autowired
    private HttpServletRequest request;

    @Autowired
    private HttpServletResponse response;

    @Autowired
    IBzSiteImportTemplateService templateService;

    /**
     * log
     */
    private static final Logger log = LoggerFactory.getLogger(FileDownloadController.class);

    /**
     * <p>
     * 下载文件 将文件输出到文件流
     * </p>
     *
     * @Param: [fileDownloadParam, bindingResult]
     * @Author: bestitxq
     * @Date: 2019/11/16
     */
    @PostMapping("/download")
    public void download(@Validated @RequestBody Map<String , String> map,
                         BindingResult bindingResult) {

        // 参数校验
        if (bindingResult.hasErrors()) {

            for (FieldError fieldError : bindingResult.getFieldErrors()) {
                throw new MissingRequestParamException(fieldError.getField() + fieldError.getDefaultMessage(), 1);
            }
        }

        response.setContentType("application/json;charset=UTF-8");

        // 获取文件路径
        String filePath = map.get("filePath");
        // 获取文件名称
        String fileName = filePath.substring(filePath.lastIndexOf("/") + 1, filePath.length());

        FileReader fileReader = null;

        // 读取文件流
        try {
            fileReader = new FileReader(
                    BaseConstant.UPLOAD_PATH() + filePath);
        } catch (cn.hutool.core.io.IORuntimeException e) {
            throw new DownloadFileNotFoundException(e.getMessage(), 1);
        }

        // 设置响应头
        response.reset();
        response.setContentType("application/octet-stream;charset=UTF-8");
        try {
            response.setHeader("Content-Disposition", "attachment;filename=" + new String(fileName.getBytes("UTF-8"),
                    "ISO-8859-1"));
        } catch (UnsupportedEncodingException e) {
            log.error(e.getMessage(), e);
            throw new RuntimeException(e.getMessage(), e);
        }

        // 获取输出流
        OutputStream fileOutputStream = null;

        try {
            fileOutputStream = response.getOutputStream();
            fileReader.writeToStream(fileOutputStream);
        } catch (IOException e) {
            log.error(e.getMessage(), e);
            throw new RuntimeException(e.getMessage(), e);
        } finally {
            if (fileOutputStream != null) {
                try {
                    fileOutputStream.close();
                } catch (IOException e) {
                    log.error(e.getMessage(), e);
                    throw new RuntimeException(e.getMessage(), e);
                }
            }
        }

    }

    /**
     * <p>
     * 导入模板下载
     * </p>
     * @deprecated: 导入模板下载
     * @menu 导入模板下载
     */
    @PostMapping("/downTemplate")
    public AjaxResult downTemplate(@RequestBody Map<String, Integer> params ) {
        Integer functionType = params.get("functionType");
        if (functionType == null) {
            return AjaxResult.error("模板下载失败,functionType为空");
        }
        QueryWrapper<BzSiteImportTemplate> query = Wrappers.query();
        BzSiteImportTemplate template = templateService.getById( functionType);

        if(template == null){
            return AjaxResult.error("为查询到模板信息");
        }
        String tempAbsPath = System.getProperty("user.dir") + BaseConstant.templatePath + template.getTemplatePath();

        try {
            // 解决中文乱码问题
            tempAbsPath = URLDecoder.decode(tempAbsPath, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            log.error(e.getMessage(), e);
            throw new RuntimeException(e.getMessage(), e);
        }

        // 获取文件名称
        String fileName = tempAbsPath.substring(tempAbsPath.lastIndexOf("/") + 1, tempAbsPath.length());

        FileReader fileReader = null;

        // 读取文件流
        try {
            fileReader = new FileReader(tempAbsPath);
        } catch (cn.hutool.core.io.IORuntimeException e) {
            throw new DownloadFileNotFoundException(e.getMessage(), 1);
        }

        // 设置响应头
        response.reset();
        response.setContentType("application/octet-stream;charset=UTF-8");
        try {
            response.setHeader("Content-Disposition", "attachment;filename=" + new String(fileName.getBytes("UTF-8"),
                    "ISO-8859-1"));
        } catch (UnsupportedEncodingException e) {
            log.error(e.getMessage(), e);
            throw new RuntimeException(e.getMessage(), e);
        }

        // 获取输出流

        try {
            response.setContentType(MediaType.APPLICATION_OCTET_STREAM_VALUE);
            FileUtils.setAttachmentResponseHeader(response, fileName);
            FileUtils.writeBytes(tempAbsPath, response.getOutputStream());
        } catch (IOException e) {
            log.error(e.getMessage(), e);
            throw new RuntimeException(e.getMessage(), e);
        }
        return null;
    }
}

package com.ruoyi.common.constant;

import cn.hutool.system.SystemUtil;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

/**
 * <p>
 *   系统基础常量
 * </p>
 *
 * @author 
 * @since 2021-8-27 16:06:38
 */
@Component
public class BaseConstant {

    /**
     * windows路径
     */
    private static String windowsPath;
    /**
     * linux路径
     */
    private static String linuxPath;
    /**
     * template路径
     */
    public static String templatePath;

    @Value("${path.windowsPath}")
    public void setWindowsPath(String windowsPath) {
        BaseConstant.windowsPath = windowsPath;
    }

    @Value("${path.linuxPath}")
    public void setLinuxPath(String linuxPath) {
        BaseConstant.linuxPath = linuxPath;
    }

    @Value("${path.templatePath}")
    public void setTemplatePath(String templatePath) {
        BaseConstant.templatePath = templatePath;
    }



    /**
     * 上传的文件相对路径前缀
     */
    public final static String UPLOAD_FILE_RELATIVE_BASEPATH_PREFIX = "attachment/";

    /**
     * 服务器上默认的上传文件路径
     * TODO 默认配置文件路径
     */
//    public final static String UPLOAD_PATH = SystemUtil.getOsInfo().isWindows() ?
//            "F:/site/" : "/usr/local/site/";

    public final static String UPLOAD_PATH() {
        return SystemUtil.getOsInfo().isWindows() ?
                windowsPath : linuxPath;
    }
}

# 文件上传，下载路径, excel模板路径(测试环境在 /src/main/resources/ 部署环境在 config 下)
path:
  windowsPath: D:/java_file_upload/soil_site/
  linuxPath: /work/shcs-jar/java_file_upload/soil_site/
  templatePath: /ruoyi-admin/src/main/resources/

package com.ruoyi.system.domain.groundwater;

import com.ruoyi.common.annotation.Excel;
import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import lombok.Data;

import java.io.Serializable;


/**
 * (SiteImportTemplate)表实体类
 *
 * @author 
 * @since 2019-12-20 10:12:42
 */
@Data
@ApiModel("模板实体类对象")
public class BzSiteImportTemplate implements Serializable {
    private static final long serialVersionUID=1L;

    @ApiModelProperty("主键")
    private Integer id;
        
    /**
     * 模板在项目中的相对路径
     */
    @ApiModelProperty("模板在项目中的相对路径")
    private String templatePath;
}

原文链接：https://blog.csdn.net/qq_40580129/article/details/120031963

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