FileReader读取中文txt文件编码丢失问题(乱码)
OS.有一个UTF-8编码的文本文件,用FileReader读取到一个字符串,然后转换字符集:str=new String(str.getBytes(),"UTF-8");结果大部分中文显示正常,但最后仍有部分汉字显示为问号! Java代码 1.public static List<String> getLines(String fileName){ 2. List<String> lines=new ArrayList<String>(); 3. try { 4. BufferedReader br = new BufferedReader(new FileReader(fileName)); 5. String line = null; 6. while ((line = br.readLine()) != null) { 7. lines.add(new String(line.getBytes("GBK"),"UTF-8")); 8. } 9. br.close(); 10. } catch (FileNotFoundException e) { 11. }catch (IOException e) {} 12. return lines; 13. } public static List<String> getLines(String fileName){List<String> lines=new ArrayList<String>();try {BufferedReader br = new BufferedReader(new FileReader(fileName));String line = null;while ((line = br.readLine()) != null) {lines.add(new String(line.getBytes("GBK"),"UTF-8"));}br.close();} catch (FileNotFoundException e) {}catch (IOException e) {}return lines;}文件读入时是按OS的默认字符集即GBK解码的,我先用默认字符集GBK编码str.getBytes(“GBK”),此时应该还原为文件中的字节序列了,然后再按UTF-8解码,生成的字符串按理说应该就应该是正确的。 为什么结果中还是有部分乱码呢? 问题出在FileReader读取文件的过程中,FileReader继承了InputStreamReader,但并没有实现父类中带字符集参数的构造函数,所以FileReader只能按系统默认的字符集来解码,然后在UTF-8 -> GBK -> UTF-8的过程中编码出现损失,造成结果不能还原最初的字符。 原因明确了,这个问题解决起来并不困难,用InputStreamReader代替FileReader,InputStreamReader isr=new InputStreamReader(new FileInputStream(fileName),"UTF-8");这样读取文件就会直接用UTF-8解码,不用再做编码转换。 Java代码 1.public static List<String> getLines(String fileName){ 2. List<String> lines=new ArrayList<String>(); 3. try { 4. BufferedReader br=new BufferedReader(new InputStreamReader(new FileInputStream(fileName),"UTF-8")); 5. String line = null; 6. while ((line = br.readLine()) != null) { 7. lines.add(line); 8. } 9. br.close(); 10. } catch (FileNotFoundException e) { 11. }catch (IOException e) {} 12. return lines; 13. }
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