测试开发进阶——spring boot——MVC——下载文件

控制器：

package com.awaimai.web;

import org.hibernate.validator.constraints.Range;
import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.validation.Valid;
import javax.validation.constraints.Max;
import javax.validation.constraints.Min;
import java.io.*;
import java.nio.file.Paths;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;


@Controller
@Validated
public class kzq
{



    @RequestMapping(value="/test10")
    public String test10(HttpServletRequest request, HttpServletResponse response)
    {

        File file = new File("C:\Users\del\IdeaProjects\helloweb\src\main\resources\uploadFiles\", "12345.pdf");
        if (file.exists()) {

            //设置响应类型，这里是下载pdf文件
            response.setContentType("application/pdf");

            //设置Content-Disposition，设置attachment，浏览器会激活文件下载框；filename指定下载后默认保存的文件名
            //不设置Content-Disposition的话，文件会在浏览器内打卡，比如txt、img文件
            response.addHeader("Content-Disposition",
                    "attachment; filename=12345.pdf");

            byte[] buffer = new byte[1024];
            FileInputStream fis = null;
            BufferedInputStream bis = null;
            // if using Java 7, use try-with-resources
            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);
                }
            } catch (IOException ex) {
                // do something,
                // probably forward to an Error page
            } finally {
                if (bis != null) {
                    try {
                        bis.close();
                    } catch (IOException e) {
                    }
                }
                if (fis != null) {
                    try {
                        fis.close();
                    } catch (IOException e) {
                    }
                }
            }
        }
        return  "index";
    }






}

　　

下载：

 

postman访问：