1 package com.test.file;
  2 
  3 import java.io.BufferedInputStream;
  4 import java.io.BufferedReader;
  5 import java.io.DataInputStream;
  6 import java.io.FileInputStream;
  7 import java.io.FileOutputStream;
  8 import java.io.IOException;
  9 import java.io.InputStreamReader;
 10 import java.io.OutputStreamWriter;
 11 import java.io.Writer;
 12 
 13 public class FileRW {
 14     public static void main(String[] args) {
 15         String file_utf = "D:/eclipse/workspace/javaFileTest/test-utf.txt";
 16         codeString(file_utf,true);
 17         getFileContent(file_utf,false);
 18 
 19         String file_gbk = "D:/eclipse/workspace/javaFileTest/test-gbk.txt";
 20         String file_gbk_utf_8 = "D:/eclipse/workspace/javaFileTest/test-gbk-utf-8-error.txt";
 21         String file_gbk_utf_16 = "D:/eclipse/workspace/javaFileTest/test-gbk-utf-16-ok.txt";
 22         
 23         transferFile(file_gbk,file_gbk_utf_8,"utf-8");
 24         transferFile(file_gbk,file_gbk_utf_16,"utf-16");
 25         
 26         codeString(file_gbk,true);
 27         getFileContent(file_gbk,false);
 28         
 29         codeString(file_gbk_utf_8,true);
 30         getFileContent(file_gbk_utf_8,false);
 31         
 32         codeString(file_gbk_utf_16,true);
 33         getFileContent(file_gbk_utf_16,false);
 34     }
 35 
 36     private static void getFileContent(String filePath,boolean forceCode)
 37     {
 38         try{
 39         String line_separator = System.getProperty("line.separator");
 40         FileInputStream fis = new FileInputStream(filePath);
 41         StringBuffer content = new StringBuffer();
 42         DataInputStream in = new DataInputStream(fis);
 43         String code = codeString(filePath,false);
 44         BufferedReader d = null;
 45         if (forceCode) {
 46             d = new BufferedReader(new InputStreamReader(in, "UTF-8"));
 47         } else {
 48             d = new BufferedReader(new InputStreamReader(in, code));
 49         }
 50         String line = null;
 51         while ((line = d.readLine()) != null)
 52             content.append(line + line_separator);
 53         d.close();
 54         in.close();
 55         fis.close();
 56       System.out.println(content);
 62         }catch(IOException e){
 63             System.out.println("获取文件内容异常");
 64         }
 65     }
 66     
 67     private static void transferFile(String srcFileName, String destFileName,String codeOuput) {
 68         try {
 69              String line_separator = System.getProperty("line.separator"); 
 70               FileInputStream fis = new FileInputStream(srcFileName);
 71               StringBuffer content = new StringBuffer();
 72               DataInputStream in = new DataInputStream(fis);
 73               String codeInput = codeString(srcFileName,false);
 74               BufferedReader d = new BufferedReader(new InputStreamReader(in, codeInput));// , "UTF-8"  
 75               String line = null;
 76               while ((line = d.readLine()) != null)
 77                content.append(line + line_separator);
 78               d.close();
 79               in.close();
 80               fis.close();
 81               Writer ow = new OutputStreamWriter(new FileOutputStream(destFileName), codeOuput);
 82               ow.write(content.toString());
 83               ow.close();
 84             System.out.println("写入完成！");
 85         } catch (Exception e) {
 86             System.out.println("文件编码转换异常");
 87         }
 88     }
 89 
 90     /**
 91      * 判断文件的编码格式
 92      * 
 93      * @param fileName
 94      *            :file
 95      * @return 文件编码格式
 96      * @throws Exception
 97      */
 98     public static String codeString(String fileName,boolean print) {
 99         String return_value = "";
100         try {
101             BufferedInputStream bin = new BufferedInputStream(
102                     new FileInputStream(fileName));
103             
104             int p = (bin.read() << 8) + bin.read();
105             
106             String code = null;
107 
108             switch (p) {
109             case 0xefbb:
110                 code = "UTF-8";
111                 break;
112             case 0xfffe:
113                 code = "Unicode";
114                 break;
115             case 0xfeff:
116                 code = "UTF-16BE";
117                 break;
118             case 0x5c75:
119                 code = "ANSI|ASCII";
120                 break;
121             default:
122                 code = "GBK";
123             }
124 
125             return_value = code;
126         } catch (Exception e) {
127             System.out.println("获取文件编码类型失败");
128         }
129         if (print)
130             System.out.println(fileName + " code:" + return_value);
131         return return_value;
132     }
133 
134 }