写入文件工具类

import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;

import java.util.List;
import java.util.Map;

import org.apache.log4j.Logger;

public class FileUtil {
    private static Logger log = Logger.getLogger(FileUtil.class);

    public  static void put2File(String fileName, List<String> message){
        FileOutputStream fileOut = null;
        BufferedOutputStream bos = null;
        if(null == fileName || "".equals(fileName)){
            log.info("fileName is empty!");
            return;
        }
        String path = System.getProperty("user.dir");
        File  file = new File(path+File.separator+fileName);
        try {
            fileOut = new FileOutputStream(file,true);
            bos = new BufferedOutputStream(fileOut);
            /*for(Map.Entry<String,String> map:message.entrySet()){
                String line = map.getKey()+":"+map.getValue();
                bos.write(line.getBytes("UTF-8"));
                bos.write(System.getProperty("line.separator").getBytes("UTF-8"));
            }*/
            for(String line : message) {
                bos.write(line.getBytes("UTF-8"));
                bos.write(System.getProperty("line.separator").getBytes("UTF-8"));
            }
            bos.flush();

        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            try {
                bos.close();
                fileOut.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }


    public  static void put2File(String fileName, String message){
        FileOutputStream fileOut = null;
        BufferedOutputStream bos = null;
        if(null == fileName || "".equals(fileName)){
            log.info("fileName is empty!");
            return;
        }
        String path = System.getProperty("user.dir");
        File  file = new File(path+File.separator+fileName);
        try {
            fileOut = new FileOutputStream(file,true);
            bos = new BufferedOutputStream(fileOut);
            /*for(Map.Entry<String,String> map:message.entrySet()){
                String line = map.getKey()+":"+map.getValue();
                bos.write(line.getBytes("UTF-8"));
                bos.write(System.getProperty("line.separator").getBytes("UTF-8"));
            }*/
            bos.write(message.getBytes("UTF-8"));
            bos.write(System.getProperty("line.separator").getBytes("UTF-8"));
            bos.flush();

        } catch (Exception e) {
            e.printStackTrace();
        }finally {
            try {
                bos.close();
                fileOut.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

    /*public static Map<String,String> readFile(String fileName){
        Map<String,String> map = new HashMap<>();
        BufferedReader br = null;
        String path = System.getProperty("user.dir") + File.separator + fileName;
        File file = new File(path);
        if (file.exists() &&  !file.isDirectory()) {
            try {
                br = new BufferedReader(new FileReader(file));
                String line = null;
                while ((line = br.readLine())!=null){
                    String[] data = line.split(":");
                    map.put(data[0],data[1]);
                }
            } catch (Exception e) {
            	log.error(" readFile  fail " , e);
            } finally {
            	try {
                    if (br != null)
                        br.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        } else {
            log.info("file doesnot exists or is Directory File Path:  " + path ) ;
        } 
        return map;
    }*/

    /**
     *  检查 生成的File的状态
     *  	1. 文件存在
     *  	2. 文件可读写 
     */
    public static boolean fileCheck(String fileName){
    	boolean result  = false;
    	String path = System.getProperty("user.dir") + File.separator + fileName;
        File file = new File(path); 
        // update ： 文件可能可以被IO但是,部署后该文件不属于应用,可能  file.canExecute() 返回为false 顾取消
//        if(file.exists() && !file.isDirectory() && file.canExecute()) {
        if(file.exists() && !file.isDirectory() ) {
        	result = true;
        }
        return result;
    }
}