将file转变成contenthash

一、将MultipartFile转file

CommonsMultipartFile cf= (CommonsMultipartFile)file;

        DiskFileItem fi = (DiskFileItem)cf.getFileItem();

        File fil = fi.getStoreLocation();

二、将file转换成contenthash

String contenthashSource = Utils.encryptSHA(Utils.file2byte(fil));

        String firstFileSource = contenthashSource.substring(0, 2);   //获取前两位作为存储一级文件夹

        String secondFileSource = contenthashSource.substring(2, 4);  //获取这两位作为存储二级文件夹    contenthash作为文件名

三、utils实体类

package cn.edu.hbcf.tools;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.nio.channels.FileChannel;

import java.security.MessageDigest;

import java.util.HashMap;

import java.util.Map;

import com.artofsolving.jodconverter.DocumentConverter;

import com.artofsolving.jodconverter.DocumentFormat;

import com.artofsolving.jodconverter.openoffice.connection.OpenOfficeConnection;

import com.artofsolving.jodconverter.openoffice.connection.SocketOpenOfficeConnection;

import com.artofsolving.jodconverter.openoffice.converter.OpenOfficeDocumentConverter;

public class Utils {

    /**

     * 定义加密方式

     */

    private final static String KEY_SHA1 = "SHA-1";

    /**

     * 全局数组

     */

    private final static String[] hexDigits = { "0", "1", "2", "3", "4", "5",

            "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };

    /**

     * SHA 加密

     * @param data 需要加密的字节数组

     * @return 加密之后的字节数组

     * @throws Exception

     */

    public static String encryptSHA(byte[] data) throws Exception {

        // 创建具有指定算法名称的信息摘要

//        MessageDigest sha = MessageDigest.getInstance(KEY_SHA);

        MessageDigest sha = MessageDigest.getInstance(KEY_SHA1);

        // 使用指定的字节数组对摘要进行最后更新

        sha.update(data);

        // 完成摘要计算并返回

        return byteArrayToHexString(sha.digest());

    }

    /**

     * 转换字节数组为十六进制字符串

     * @param bytes 字节数组

     * @return 十六进制字符串

     */

    private static String byteArrayToHexString(byte[] bytes) {

        StringBuffer sb = new StringBuffer();

        for (int i = 0; i < bytes.length; i++) {

            sb.append(byteToHexString(bytes[i]));

        }

        return sb.toString();

    }

    /**

     * 将一个字节转化成十六进制形式的字符串

     * @param b 字节数组

     * @return 字符串

     */

    private static String byteToHexString(byte b) {

        int ret = b;

        //System.out.println("ret = " + ret);

        if (ret < 0) {

            ret += 256;

        }

        int m = ret / 16;

        int n = ret % 16;

        return hexDigits[m] + hexDigits[n];

    }

    public static byte[] file2byte(File file)

    {

        byte[] buffer = null;

        try

        {

            FileInputStream fis = new FileInputStream(file);

           ByteArrayOutputStream bos = new ByteArrayOutputStream();

           byte[] b = new byte[1024];

            int n;

           while ((n = fis.read(b)) != -1)

            {

             bos.write(b, 0, n);

            }

           fis.close();

            bos.close();

            buffer = bos.toByteArray();

        }

       catch (FileNotFoundException e)

       {

           e.printStackTrace();

        }

        catch (IOException e)

        {

            e.printStackTrace();

        }

        return buffer;

    }

    /**

     *

     * @方法描述: 将office文件装换成pdf存储

     * @param

     * @return void

     * @author 全冉

     * @date 2016-2-3

     */

    public static void convert(File input, File output, DocumentFormat outputFormat){

        OpenOfficeConnection connection = new SocketOpenOfficeConnection(8100);

        try {

            connection.connect();

            DocumentConverter converter = new OpenOfficeDocumentConverter(connection);

            converter.convert(input, output, outputFormat);

        } catch(Exception e) {

            e.printStackTrace();

        } finally {

            try{ if(connection != null){connection.disconnect(); connection = null;}}catch(Exception e){}

        }

    }

    /**

     *

     * @方法描述: 将文件复制到一个指定位置

     * @param

     * @return void

     * @author 全冉

     * @date 2016-2-3

     */

    public static void copy(File fil,File f){

        FileChannel in = null;

        FileChannel out = null;

        FileInputStream inStream = null;

        FileOutputStream outStream = null;

        try {

            inStream = new FileInputStream(fil);

            outStream = new FileOutputStream(f);

            in = inStream.getChannel();

            out = outStream.getChannel();

            in.transferTo(0, in.size(), out);

        } catch (IOException e) {

            e.printStackTrace();

        } finally {

            try {

                inStream.close();

                in.close();

                outStream.close();

                out.close();

            } catch (IOException e) {

                e.printStackTrace();

            }

        }

    }

}