一、環(huán)境配置

所有OS，建議使用python3.6；python2.7也可以，但在安裝過(guò)程中可能遇到升級(jí)pip等問(wèn)題；請(qǐng)參考pyzbar官網(wǎng)https://pypi.org/project/pyzbar/

1.Ubuntu16.4

apt-get install libzbar0pip install pyzbarpip install Pillow

2.Centos7

yum install python-develyum install zbar-develyum install zbar

pip install Pillowpip install pyzbar

3.Windows

pip install Pillowpip install pyzbar

還需安裝Visual C++ Redistributable Packages for Visual Studio 2013，即從微軟官方下載的 vcredist_x64.exe程序

二、代碼編寫(xiě)

Java代碼

UserController.java

package com.yang.springbootlucene.controller;import lombok.Data;import lombok.extern.slf4j.Slf4j;import org.springframework.beans.factory.annotation.Value;import org.springframework.core.io.ClassPathResource;import org.springframework.web.bind.annotation.RequestBody;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import java.io.File;import java.io.FileWriter;import java.io.IOException;/** * @author:yjx * @description: * @date:2019/11/28 15:29 */@Slf4j@RestController@RequestMapping('/user')public class UserController { @Value('${pyzbar.script}') private String scriptPath; private static final String BASE_64_PREFIX = 'data:image/png;base64,'; /** * 這種方式在源碼中成功調(diào)用，但達(dá)成jar包后，找不到腳本路徑，所以腳本必須放在外面 */ @Deprecated private static String pyZbarScriptPath; /* static { ClassPathResource pathResource = new ClassPathResource('/script/my_py_zbar.py'); try { pyZbarScriptPath = pathResource.getFile().getAbsolutePath(); } catch (IOException e) { e.printStackTrace(); } } */ @RequestMapping('/cameraScanPyZbar') public Object cameraScanPyZbar(@RequestBody String base64) throws IOException { if (this.checkBase64Head(base64)) { //1.去掉base64字符的頭部 String base64Str = this.cutHead(base64); //2.創(chuàng)建臨時(shí)文件（由于圖片的base64字符太長(zhǎng)，不支持直接以命令參數(shù)的形式傳遞，故將字符串寫(xiě)入臨時(shí)文件，而后python程序讀取臨時(shí)文件內(nèi)容） String tempPath = './' + Thread.currentThread().getName(); File tempFile = new File(tempPath); FileWriter fileWriter = new FileWriter(tempFile, false); fileWriter.write(base64Str); fileWriter.flush(); fileWriter.close(); //3.調(diào)用pyzbar解析base64字符串 String plainText = PyZbarUtil.executePyzbar('python', scriptPath, tempFile.getAbsolutePath()); //4.刪除臨時(shí)文件 tempFile.delete(); System.err.println('--------->' + plainText); return plainText; } else { return '參數(shù)格式錯(cuò)誤'; } } /** * 校驗(yàn)Base64值是否已規(guī)定的串開(kāi)始 * * @param base64 * @return */ private boolean checkBase64Head(String base64) { return base64.startsWith(BASE_64_PREFIX); } /** * Base64去頭 * * @param base64 * @return */ private String cutHead(String base64) { return base64.replaceAll(BASE_64_PREFIX, ''); }}

PyZbarUtil.java

package com.yang.springbootlucene.controller;import java.io.BufferedReader;import java.io.InputStreamReader;public final class PyZbarUtil { /** * 腳本執(zhí)行工具類(lèi) * * @param lang 命令語(yǔ)言 * @param scriptPath 腳本絕對(duì)路勁 * @param base64Path base64文件絕對(duì)路徑 * @return */ public static String executePyzbar(String lang, String scriptPath, String base64Path) { String[] arguments = new String[]{lang, scriptPath, base64Path}; try { Process process = Runtime.getRuntime().exec(arguments); int re = process.waitFor(); if (re == 0) {try (BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream(), 'GBK'));) { return in.readLine();} } else {System.err.println('腳本調(diào)用失敗'); } } catch (Exception e) { e.printStackTrace(); } return null; }}

python腳本my_py_zbar.py

# -*-coding:UTF-8-*-import sysimport base64from io import BytesIOimport pyzbar.pyzbar as pyzbarfrom PIL import Image,ImageEnhance’’’將base64轉(zhuǎn)換為字節(jié)流’’’def convert_base64_to_byte_stream(base64_str): # 1.解碼Base64字符串 img_data = base64.b64decode(base64_str) # 2.將節(jié)碼結(jié)果轉(zhuǎn)為字節(jié)流 byte_stream = BytesIO(img_data) return byte_stream’’’從將字節(jié)流解析二維碼’’’def parse_byte_stream_qr_code(byte_stream): # 3.打開(kāi)字節(jié)流得到圖片對(duì)象 img = Image.open(byte_stream) img = ImageEnhance.Brightness(img).enhance(2.0) #增加亮度 img = ImageEnhance.Contrast(img).enhance(4.0) #增加對(duì)比度 # img = ImageEnhance.Sharpness(img).enhance(17.0) #銳利化 # img = img.convert(’L’) #灰度化 # img.show() # 播放圖片，供測(cè)試用 # 4.調(diào)用pyzbar解析圖片中的二維碼 barcodes = pyzbar.decode(img) # 5.打印解析結(jié)果 return barcodes[0].data.decode('utf-8')def main(argv):# print(parse_byte_stream_qr_code(convert_base64_to_byte_stream(argv[1]))) print(parse_byte_stream_qr_code(convert_base64_to_byte_stream(open(argv[1]).readline())))if __name__ == '__main__': main(sys.argv)

三、主要坑點(diǎn)

圖片轉(zhuǎn)base64后，得到的字符串太長(zhǎng)，不能直接以命令參數(shù)的形式傳遞，所以必須將其寫(xiě)入臨時(shí)文件，然后python腳本讀取臨時(shí)文件進(jìn)行解析 若將python腳本放在項(xiàng)目中，項(xiàng)目打成jar包后，無(wú)法定位腳本路徑，導(dǎo)致執(zhí)行失敗，所以必須將腳本放在jar包外，以配置的形式將路徑傳遞給java項(xiàng)目

以上就是本文的全部?jī)?nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持好吧啦網(wǎng)。