浏览器下载服务端文件

package com.excel.controller;

import com.alibaba.excel.ExcelWriter;import org.springframework.web.bind.annotation.GetMapping;
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.File;
import java.io.FileInputStream;
import java.io.OutputStream;

/**
* 下载文件
* @author : tony
* @version :1.0
*/
@RequestMapping("/excel")
@RestController
public class ExcelController {

/**
* 下载已经生成好的文件
* @param request
* @param response
*/
@GetMapping("/downExcel.action")
public void download1Excel(HttpServletRequest request, HttpServletResponse response){
OutputStream out = null;
ExcelWriter excelWriter = null;
File file = null;
FileInputStream input = null;
try {
out = response.getOutputStream();
//设置ConetentType CharacterEncoding Header,需要在out.write()之前设置
// 设置头信息
response.setCharacterEncoding("UTF-8");
// 告诉浏览器用什么软件可以打开此文件
response.setHeader("content-Type", "application/vnd.ms-excel");

// 下载文件的默认名称
response.setHeader("Content-Disposition", "attachment;filename="+ URLEncoder.encode(fileName, "UTF-8"));

//本地已存在的文件
file = new File("excelByModel.xlsx");
input = new FileInputStream(file);
int len;
byte[] bytes = new byte[1024];
while((len =input.read(bytes))> 0){
out.write(bytes,0,len);
}
out.flush();
}catch (Exception e){
e.printStackTrace();
}finally {
try {
input.close();
} catch (IOException e) {
e.printStackTrace();
}
try {
out.close();
}catch (Exception e){
e.printStackTrace();
}
}
}
}