springmvc文件下载

文件下载

使用NIO完成文件夹在几步轻松搞定

package com.sz.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

@Controller
@RequestMapping("/download")
public class FileDownloadController {

    private String downloadPath = "D:" + File.separator;

    // 下载D盘的reposi.rar
    @RequestMapping("/m1")
    public String m1(HttpServletResponse response){
        String fileName = "reposi.rar";
//        if()
        // 构建FIle
        // 构建一个Path对象
        Path path = Paths.get(downloadPath,fileName);

        if(Files.exists(path)){
            // 如果路径对象存在，可以下载
            // 通过response响应出去
            // 设置好文件类型
            response.setContentType("application/rar");
            // 添加头信息，指定浏览器行为
            response.addHeader("Content-Disposition",
                    "attachment; filename=像我这么帅的人当然是主角.rar");
            // 准备拷贝
            try {
                Files.copy(path,response.getOutputStream());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
 
        return null;
    }
}

注意，如果是英文名称当然没问题，中文就尴尬了，必须要额外处理下

先以U8解开，然后以ISO8859-1重组

package com.sz.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

@Controller
@RequestMapping("/download")
public class FileDownloadController {

    private String downloadPath = "D:" + File.separator;

    // 下载D盘的reposi.rar
    @RequestMapping("/m1")
    public String m1(HttpServletResponse response){
        String fileName = "reposi.rar";
//        if()
        // 构建FIle
        // 构建一个Path对象
        Path path = Paths.get(downloadPath,fileName);
        if(Files.exists(path)){
            // 如果路径对象存在，可以下载
            // 通过response响应出去
            // 设置好文件类型
            response.setContentType("application/rar");
            // 添加头信息，指定浏览器行为
            response.setCharacterEncoding("UTF-8");
            String newName = null;
            try {
                newName = new String("像我这么帅的人当然是主角".getBytes("UTF-8"),"ISO8859-1");
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            }
            response.addHeader("Content-Disposition",
                    "attachment; filename=" +
                            newName+".rar");
            // 准备拷贝
            try {
                Files.copy(path,response.getOutputStream());
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return null;
    }
}