从服务器下载文件到本地

第一种方法：
/**
     * 下载文件到本地
     * @param filePathArr path 文件路径
     *                    fileName 文件名
     * @param response
     * @throws IOException
     */
    public static void download(String[] filePathArr, HttpServletResponse response) throws IOException {
        File file = new File(filePathArr[0]+"\\"+filePathArr[1]);
        response.setContentType("application/octet-stream");
        response.setHeader("Content-disposition","attachment;fileName="+ URLEncoder.encode(filePathArr[1],"UTF-8"));
        BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));
        BufferedOutputStream bos = new BufferedOutputStream(response.getOutputStream());

        byte[] buff = new byte[2048];
        while(true){
            int bytesRead;
            if(-1 == (bytesRead = bis.read(buff))) break;
            bos.write(buff,0,bytesRead);
        }

        bis.close();
        bos.close();
    }

第二种方法:
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;

public static ResponseEntity<byte[]> download(String[] filePathArr, HttpServletResponse response) throws IOException {
        File file = new File(filePathArr[0]+"\\"+filePathArr[1]);
        HttpHeaders headers = new HttpHeaders();
        headers.setContentDispositionFormData("attachment", new String(filePathArr[1].getBytes("UTF-8"),"iso-8859-1"));
        //application/octet-stream ： 二进制流数据（最常见的文件下载
        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
        return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),
                headers, HttpStatus.CREATED);
    }

Content-Disposition属性有两种类型：inline 和 attachment
inline ：将文件内容直接显示在页面
attachment：弹出对话框,让用户下载

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