SpringMVC实现文件下载

上次使用springMVC实现了文件上传功能，本次使用springMVC实现文件下载功能。相关配置文件和jar包参考文件上传。
1.代码实现

package com.bb.controller;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;




@Controller
public class UserController {
	
	//下载文件，方式一
	@RequestMapping("/download")
	public void downloadFile(HttpServletRequest request, HttpServletResponse response) throws IOException{
		System.out.println("--download--");
		File file = new File("d:/files/timg.jpg");
		//设置响应头和客户端保存文件名
		response.setCharacterEncoding("utf-8");
		response.setContentType("multipart/form-data");
		response.setHeader("Content-Disposition", "attachment;fileName=" + file.getName());
		
		ServletOutputStream out = response.getOutputStream();
		
		InputStream in = new FileInputStream(file);
		
		byte[] bs = new byte[1024];
		int num = 0;
		while((num = in.read(bs)) != -1){
			out.write(bs, 0, num);
		}
		in.close();
		out.flush();
		out.close();
	}
	
	//方式二
	@RequestMapping("/download2")
	public ResponseEntity<byte[]> download(HttpServletRequest request) throws IOException {
	    // 需要下载的文件
		File file = new File("d:/tools/t1.jpg");
	    byte[] body = null;
	    InputStream is = new FileInputStream(file);
	    body = new byte[is.available()];
	    is.read(body);
	    HttpHeaders headers = new HttpHeaders();
	    headers.add("Content-Disposition", "attchement;filename=" + file.getName());
	    HttpStatus statusCode = HttpStatus.OK;
	    ResponseEntity<byte[]> entity = new ResponseEntity<byte[]>(body, headers, statusCode);
	    is.close();
	    return entity;
	}
		
}

2.jps页面

3.运行结果