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通過cpdetector這個開源的jar包可以自動判斷當前文件的內容編碼，從而在讀取的時候選擇正確的編碼讀取，避免亂碼問題。

測試結果，提供截圖:

package com.zuidaima.test;

import info.monitorenter.cpdetector.io.ASCIIDetector;

import info.monitorenter.cpdetector.io.CodepageDetectorProxy;

import info.monitorenter.cpdetector.io.JChardetFacade;

import info.monitorenter.cpdetector.io.ParsingDetector;

import info.monitorenter.cpdetector.io.UnicodeDetector;

import java.io.BufferedReader;

import java.io.File;

import java.io.FileInputStream;

import java.io.InputStreamReader;

public class Main {

public static String getContent(String path) throws Exception {

File file = new File(path);

CodepageDetectorProxy detector = CodepageDetectorProxy.getInstance();

detector.add(new ParsingDetector(false));

detector.add(JChardetFacade.getInstance());

detector.add(ASCIIDetector.getInstance());

detector.add(UnicodeDetector.getInstance());

java.nio.charset.Charset charset = null;

try {

charset = detector.detectCodepage(file.toURI().toURL());

} catch (Exception ex) {

ex.printStackTrace();

}

String charsetName = null;

if (charset != null) {

charsetName = charset.name();

} else {

charsetName = "UTF-8";

}

BufferedReader reader = new BufferedReader(new InputStreamReader(

new FileInputStream(file)， charsetName));

String line = null;

String lines = "";

while ((line = reader.readLine()) != null) {

lines += line + " ";

}

reader.close();

return lines;

}

public static void main(String[] args) throws Exception {

System.out.println(getContent("bin/gbk.txt"));

System.out.println(getContent("bin/utf8.txt"));

}

}

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