IO操作工具类--基于common-io

封装IO的一些常用操作:基于Common-io  ：IOUtils方法


CommonUtils.java

package com.gbcom.frame.io;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;

/**
 * 封装IO的一些常用操作:基于Common-io  ：IOUtils方法
 *   1.read.write.copy.delete.convert
 * 
 * 
 * 无异常  无空指针
 * @author SYZ
 * @date 2014-12-4,上午10:20:22
 * @version v1.0.0
 * @see com.gbcom.frame.io.CommonUtils
 */
public class CommonUtils {
	private static List<String> readLines(File file) throws IOException{
		return readLines(file,"UTF-8");
	}
	private static List<String> readLines(File file,String encoding) throws IOException{
		return FileUtils.readLines(file, encoding);
	}
	private static List<String> readLines(InputStream input) throws IOException{
		return readLines(input,"UTF-8");
	}
	private static List<String> readLines(InputStream input,String encoding) throws IOException{
		return IOUtils.readLines(input, encoding);
	}
	private static List<String> readLines(Reader read) throws IOException{
		return IOUtils.readLines(read);
	}
	
	/**
	 * 读取文件，保存到byte数组中：不需要指定具体编码格式
	 * @param srcFile
	 * @return
	 */
	public static byte[] read(String srcFile){

		File file = new File(srcFile);
		InputStream input = null;
		try{
			input = new FileInputStream(file);
			return IOUtils.toByteArray(input);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			IOUtils.closeQuietly(input);
		}
		return new byte[0];
	
	}
	/**
	 * 读取文件：保存到String对象中，默认使用utf-8作为编码格式
	 * @param srcFile
	 * @return
	 */
	public static String readAll(String srcFile){
		File file = new File(srcFile);
		InputStream input = null;
		try{
			input = new FileInputStream(file);
			return IOUtils.toString(input, "utf-8");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			IOUtils.closeQuietly(input);
		}
		return "";
	}
	/**
	 * 读取文件，按行分割保存到list中，默认编码格式为utf-8
	 * @param srcFile
	 * @return
	 */
	public static List<String> readLines(String srcFile){
		File file = new File(srcFile);
		InputStream input = null;
		try {
			input = new FileInputStream(file);
			return readLines(input,"utf-8");
			//IOUtils.readLines(input, encoding);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			IOUtils.closeQuietly(input);
		}
		return new ArrayList<String>(0);
	}
	/**
	 * 写文件。最原始的方式，支持 byte数组，无序提供编码格式
	 * @param srcFile
	 * @param data
	 */
	public static void wirte(String srcFile,byte[] data){
		File file  = new File(srcFile);
		OutputStream out = null;
		try {
			out = new FileOutputStream(file);
			IOUtils.write(data, out);
		} catch (IOException e) {
			e.printStackTrace();
		}finally{
			if(out !=null){
				IOUtils.closeQuietly(out);
			}
		}
	}
	/**
	 * 一次性写入文件，如果需要分行，需要再buffer中使用\n 实现
	 * @param srcFile
	 * @param buffer
	 */
	public static void writeAll(String srcFile,StringBuffer buffer){
		File file  = new File(srcFile);
		OutputStream out = null;
		try {
			out = new FileOutputStream(file);
			IOUtils.write(buffer, out,"utf-8");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			if(out !=null){
				IOUtils.closeQuietly(out);
			}
		}
	
	}
	/**
	 * 写文件：支持多行写入，list提供
	 * @param srcFile
	 * @param lines
	 */
	public static void writeLines(String srcFile,List<String> lines){
		File file  = new File(srcFile);
		OutputStream out = null;
		try {
			out = new FileOutputStream(file);
			IOUtils.writeLines(lines, null, out, "UTF-8");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			if(out !=null){
				IOUtils.closeQuietly(out);
			}
		}
	}
	

	/**
	 * 在文件末尾添加：仅支持
	 * @param scrFile
	 * @param Lines
	 */
	public static void appendWrite(String srcFile,List<String>lines){
		File file  = new File(srcFile);
		OutputStream out = null;
		try {
			out = new FileOutputStream(file,true);//append
			IOUtils.writeLines(lines, null, out, "UTF-8");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			if(out !=null){
				IOUtils.closeQuietly(out);
			}
		}
	
		
	}
	/**
	 * 在文件末尾添加：仅支持 List 和 StringBuffer 其他省略
	 * @param scrFile
	 * @param Lines
	 */
	public static void appendWrite(String srcFile,StringBuffer buffer ){
		File file  = new File(srcFile);
		OutputStream out = null;
		try {
			out = new FileOutputStream(file,true);//append
			IOUtils.write(buffer, out, "UTF-8");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			if(out !=null){
				IOUtils.closeQuietly(out);
			}
		}
	}
	
	
	/**
	 * 拷贝文件，，return count  failed  return -1
	 * @param src
	 * @param dest
	 */
	public static int  copy(String src,String dest){
		File srcFile = new File(src);
		File destFile = new File(dest);
		
		InputStream input = null;
		OutputStream output = null;
		try {
			input = FileUtils.openInputStream(srcFile);
			output = new FileOutputStream(destFile);
			return IOUtils.copy(input, output);
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			if(output !=null){
				IOUtils.closeQuietly(output);
			}
			if(input !=null){
				IOUtils.closeQuietly(input);
			}
		}
		return -1;
	}
	
	/**
	 * 支持文件夹操作
	 * @param dest
	 */
	public static void delete(String ... dests){
		for(String dest : dests){
			File file = new File(dest);
			try {
				FileUtils.forceDeleteOnExit(file);
			} catch (IOException e) {
				e.printStackTrace();
				continue;
			}finally{
				file = null;
			}
		}
	}
	
	
	public static void main(String args []) throws IOException{
		String dir = "d:\\";
		String srcName = "xxx.jpg";
		String destName = "test.xds";
		
		
//		FileUtils.forceMkdir(new File(dir));
//		
//		copy(dir+File.separator+srcName,dir+File.separator+destName);
		
		delete(dir+File.separator+srcName,dir+File.separator+destName);
	}
}