IO流之间的转换应用

package com.laoxu.test.day01.streamDemo;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

/**
* 通过IO流复制文件
* @author Administrator
*
*/
public class InputAndOutPutStreamDemo {

private static boolean IO_IS_SUCCESS = true;
/**
* 获取文件路径,判断是否存在该文件或者该文件路径是否正确
* @param fileName
* @return
*/
private static File getFile(String fileName){
File file = new File(fileName);
if(file.exists()&&file.isFile())
return file;
return null;
}
private static File getOutputFile(String outfileName){
return new File(outfileName);
}
/**
* 获取文件的IO流
* @param file
*/
private static FileInputStream getInputStream(File file){
if(file==null){
System.out.println("getInputStream error");
return null;
}
try {
FileInputStream fis = new FileInputStream(file);
return fis;
} catch (Exception e) {
e.printStackTrace();
try {
throw new FileNotFoundException(e.getMessage());
} catch (Exception e1) {
e1.printStackTrace();
}
}
return null;
}
/**
* 通过传递的InputStream和OutputStream，将文件复制，输出
* @param file
* @param fis
* @return
* @throws IOException
*/
private static boolean outputInfo(BufferedReader br,BufferedWriter bw) {
if(br==null || bw==null){
return !IO_IS_SUCCESS;
}
try {
String str = "";
while(true){
str = br.readLine();
if(str==null){
break;
}
bw.write(str+"\n");
}
closeStream(br);
closeStream(bw);
return IO_IS_SUCCESS;
} catch (Exception e) {
e.printStackTrace();
return !IO_IS_SUCCESS;
}

}
/**
* 获取缓冲字符输入流
*/
private static BufferedReader getBufferReader(FileInputStream fis){
return new BufferedReader(new InputStreamReader(fis));
}
/**
* 获取缓冲字符输出流
*/
private static BufferedWriter getBufferWrite(FileOutputStream fos){
return new BufferedWriter(new OutputStreamWriter(fos));
}
/**
* 获取输出OutputStream流
* @param file
* @return
*/
private static FileOutputStream getOutputStream(File file){
if(file==null){
return null;
}
try {
FileOutputStream fos = new FileOutputStream(file);
return fos;
} catch (FileNotFoundException e) {
e.printStackTrace();
try {
throw new Exception(e.getMessage());
} catch (Exception e1) {
e1.printStackTrace();
}
return null;
}
}
/**
* 关闭流
* @param obj
* @throws IOException
*/
public static void closeStream(Object obj) throws IOException{
if(obj!=null){
if(obj instanceof FileInputStream){
((FileInputStream) obj).close();
return ;
}else if(obj instanceof FileOutputStream){
((FileOutputStream) obj).close();
return ;
}
else if(obj instanceof BufferedReader){
((BufferedReader) obj).close();
return ;
}
else if(obj instanceof BufferedWriter){
((BufferedWriter) obj).close();
return ;
}
else if(obj instanceof InputStreamReader){
((InputStreamReader) obj).close();
return ;
}
else if(obj instanceof OutputStreamWriter){
((OutputStreamWriter) obj).close();
return ;
}

}
return ;
}
/**
* 整合方法
* @param inputFile
* @param outFile
*/
public static boolean copyMethod(String inputFile,String outFile){
return outputInfo(getBufferReader(getInputStream(getFile(inputFile))),getBufferWrite(getOutputStream(getOutputFile(outFile))));

}


/**
* 测试方法
* @param args
*/
public static void main(String[] args) {
String inputFile = "C:"+File.separator+"debug.ini";
String outFile = "C:"+File.separator+"debug.txt";
if(copyMethod(inputFile, outFile)){
System.out.println("success");
}else{
System.out.println("error");
}
}


}