文件操作Util

package XXX.util;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

/**
 * 文件操作
 * @author Administrator
 *
 */
public class FileUtil {

	//static String log_path = "E:\\\\workspace\\\\eclipse\\\\Checked.txt";
	
	static String log_path = System.getProperty("user.dir")+"/Checked.txt";
	
	public static void appendLog(String msg) {
		try {
			File file = new File(log_path);
			if (!file.exists()) {
				file.createNewFile();
			}
			//创建文件输入流
			FileOutputStream out =new FileOutputStream(file,true); //如果追加方式用true
            //写入内容
            StringBuffer sb=new StringBuffer();
            sb.append("\n");
            sb.append(msg);
            out.write(sb.toString().getBytes("utf-8"));//注意需要转换对应的字符集
            out.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	
	public static void updateFile(String path, String msg) {
		try {
			File file = new File(path);
			if (!file.exists()) {
				String error_msg = "updateFile失败：";
				error_msg += "path:"+path+"\n";
				FileUtil.appendLog(error_msg);
			}
			//创建文件输入流
			FileOutputStream out =new FileOutputStream(file); //更改文件内容
            //写入内容
            StringBuffer sb=new StringBuffer();
            sb.append(msg);
            out.write(sb.toString().getBytes("utf-8"));//注意需要转换对应的字符集
            out.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	/**
	 * 获取匹配的文件名集合
	 * @param path
	 * @param inputDay
	 * @return
	 */
	public static List<String> findFileList(String path,String inputDay){
		String fName = path;
		File pathFile =new File(fName.trim());
		File[] fileNum = pathFile.listFiles();
		ArrayList<String> findList = new ArrayList<>();
		for (File file : fileNum) {
			String fileName = file.getName();
			String tempFileName = "";
			if(fileName.length()>26) {
				tempFileName = fileName.substring(19, 27);
			}
			if(inputDay.equals(tempFileName)) {
				findList.add(fileName);
			}
		}
		return findList;
	}
	
	
	/**
	 * 读取文件内容
	 * @param fileName
	 * @return
	 */
	public static String readToString(String fileName) {  
		try {
            BufferedReader in = new BufferedReader(new FileReader(fileName));
            String str = "", data = "";
            while ((str = in.readLine()) != null) {
                data += str;
            }
            in.close();
            return data;
        } catch (IOException e) {
        	e.getStackTrace();
        	return null;
        }
    }


/**
	 * 查找文件路径下所有的文件个数
	 * @param path
	 * @return
	 */
	public static Integer findAllFileListSize(String path){
		String fName = path;
		File pathFile =new File(fName.trim());
		File[] fileNum = pathFile.listFiles();
		ArrayList<String> findList = new ArrayList<>();
		for (File file : fileNum) {
			String fileName = file.getName();
			findList.add(fileName);
		}
		return findList.size();
	}
	
	/**
	 * 创建文件
	 * @param filePath
	 */
	public static void createFile(String filePath) {
		File file =new File(filePath.trim());
		try {
			//如果文件不存在，创建文件
			if(!file.exists()) {
				file.createNewFile();
				System.out.println("创建文件:"+filePath);
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
}