JAVA读取MySQL中的blob字段

来源：互联网发布：扫描sql注入点编辑：程序博客网时间：2024/05/16 05:54

背景环境：Nutch爬取网站中的数据后存放到MySQL，对于抓取数据中的网页源码，存放格式为longblob，当用JAVA读取时，读取的数据为：

77u/PCFET0NUWVBFIEhUTUwgUFVCTElDICItLy9XM0MvL0RURCBIVE1MIDQuMDEgVHJhbnNpdGlvbmFsLy9FTiIgImh0dHA6Ly93d3cudzNjLm9yZy9UUi8xOTk5L1JFQy1odG1sNDAxLTE5OTkxMjI0

类似以上的代码，经过查阅相关资料，以上的编码格式为base64

如果要在HTML界面显示，可通过以下JS代码进行进行解析

var base64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";var base64DecodeChars = new Array(    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1,    -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63,    52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, -1, -1, -1,    -1,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,    15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1,    -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,    41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1);function base64decode(str) {    var c1, c2, c3, c4;    var i, len, out;    len = str.length;    i = 0;    out = "";    while(i < len) {    /* c1 */    do {        c1 = base64DecodeChars[str.charCodeAt(i++) & 0xff];    } while(i < len && c1 == -1);    if(c1 == -1)        break;    /* c2 */    do {        c2 = base64DecodeChars[str.charCodeAt(i++) & 0xff];    } while(i < len && c2 == -1);    if(c2 == -1)        break;    out += String.fromCharCode((c1 << 2) | ((c2 & 0x30) >> 4));    /* c3 */    do {        c3 = str.charCodeAt(i++) & 0xff;        if(c3 == 61)        return out;        c3 = base64DecodeChars[c3];    } while(i < len && c3 == -1);    if(c3 == -1)        break;    out += String.fromCharCode(((c2 & 0XF) << 4) | ((c3 & 0x3C) >> 2));    /* c4 */    do {        c4 = str.charCodeAt(i++) & 0xff;        if(c4 == 61)        return out;        c4 = base64DecodeChars[c4];    } while(i < len && c4 == -1);    if(c4 == -1)        break;    out += String.fromCharCode(((c3 & 0x03) << 6) | c4);    }    return out;}function utf8to16(str) {    var out, i, len, c;    var char2, char3;    out = "";    len = str.length;    i = 0;    while(i < len) {    c = str.charCodeAt(i++);    switch(c >> 4)    {       case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:        // 0xxxxxxx        out += str.charAt(i-1);        break;      case 12: case 13:        // 110x xxxx   10xx xxxx        char2 = str.charCodeAt(i++);        out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));        break;      case 14:        // 1110 xxxx  10xx xxxx  10xx xxxx        char2 = str.charCodeAt(i++);        char3 = str.charCodeAt(i++);        out += String.fromCharCode(((c & 0x0F) << 12) |                       ((char2 & 0x3F) << 6) |                       ((char3 & 0x3F) << 0));        break;    }    }    return out;}

使用方法为：

utf8to16(base64decode(src))

若要在HTML界面显示的话不建议直接在JAVA中直接转码，因为转码后的网页源码带双引号，不利于数据的传输！

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