更改文件编码

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import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Writer;
/**
*
* @Title:ChangeFileCode.java
* @Package:com.pde.pdp.ffc.util
* @Description: 更改文件编码
* @author guods
* @date 2012-7-5 下午02:10:16
* @version 1.0
*/
public class ChangeFileCode {
// 读取的文件
private String fileIn;
// 读取时文件用的编码
private String fileInEn;
// 写出的文件
private String fileOut;
// 写出时文件用的编码
private String fileOutEn;
/**
* 获取源文件的编码
* @param filePath 源文件所在的绝对路径
* @return
*/
public String getFileEnCode(String filePath) {
InputStream inputStream = null;
String code = "";
byte[] head = new byte[3];
try {
inputStream = new FileInputStream(filePath);
inputStream.read(head);
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if(inputStream!=null)
inputStream.close();
} catch (IOException e) {
//e.printStackTrace();
}
}
code = "GB2312";
if (head[0] == -1 && head[1] == -2 )
code = "UTF-16";
if (head[0] == -2 && head[1] == -1 )
code = "Unicode";
if(head[0]==-17 && head[1]==-69 && head[2] ==-65)
code = "UTF-8";
return code;
}
public void setFileIn(String fileInPath, String fileInEncoding) {
this.setFileIn(fileInPath);
this.setFileInEn(fileInEncoding);
}
public void setFileOut(String fileOutPath, String fileOutEncoding) {
this.setFileOut(fileOutPath);
this.setFileOutEn(fileOutEncoding);
}
public void start() {
String str = this.read(fileIn,fileInEn);
this.write(fileOut, fileOutEn, str);
}
/**
* 读文件
*
* @param fileName
* @param encoding
*/
private String read(String fileName, String encoding) {
try {
BufferedReader in = new BufferedReader(new InputStreamReader(
new FileInputStream(fileName), encoding));
String string = "";
String str = "";
while ((str = in.readLine()) != null) {
string += str + "\n";
}
in.close();
return string;
} catch (Exception ex) {
//ex.printStackTrace();
}
return "";
}
/**
* 写文件
*
* @param fileName
* 新的文件名
* @param encoding
* 写出的文件的编码方式
* @param str
*/
private void write(String fileName, String encoding, String str) {
try {
Writer out = new BufferedWriter(new OutputStreamWriter(
new FileOutputStream(fileName), encoding));
out.write(str);
out.close();
} catch (Exception ex) {
//ex.printStackTrace();
}
}
public String getFileIn() {
return fileIn;
}
public void setFileIn(String fileIn) {
this.fileIn = fileIn;
}
public String getFileInEn() {
return fileInEn;
}
public void setFileInEn(String fileInEn) {
this.fileInEn = fileInEn;
}
public String getFileOut() {
return fileOut;
}
public void setFileOut(String fileOut) {
this.fileOut = fileOut;
}
public String getFileOutEn() {
return fileOutEn;
}
public void setFileOutEn(String fileOutEn) {
this.fileOutEn = fileOutEn;
}
public static void main(String[] args) {
String InputFilePath = "f:\\";
String FileName = "2.txt";
ChangeFileCode changeFileCode = new ChangeFileCode();
String path = InputFilePath+FileName;
File file = new File(path);
String fileCode = changeFileCode.getFileEnCode(path);
if(fileCode!=null && !"".equals(fileCode) && !"UTF-8".equals(fileCode)) {
changeFileCode.setFileIn(file.getPath(), fileCode);//如果文件编码为ANSI用GBK来读，如果是UTF-8用UTF-8来读
changeFileCode.setFileOut(file.getPath(), "UTF-8");//UTF-8则文件编码为UTF-8，如果为GBK，编码为ANSI
changeFileCode.start();
}
}
}

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