生成UUID

    UUID uuid=UUID.randomUUID();
    System.out.println("uuid======"+uuid);

檔案上傳下載

package com.imt.sys.util;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.UUID;

import org.junit.Test;
import
 
 org.springframework.test.context.TestExecutionListeners;

public class uploadText {
    private   String file = "";
    //儲存字串到檔案中
    public void saveAsFileWriter(String content,UUID uuid) {
     file="F:/text/"+uuid+".txt";
     FileWriter fwriter = null;
     try {
      fwriter = new FileWriter(file);
      fwriter.write(content);
     } catch
 
 (IOException ex) {
      ex.printStackTrace();
     } finally {
      try {
       fwriter.flush();
       fwriter.close();
      } catch (IOException ex) {
       ex.printStackTrace();
      }
     }
    }
        //讀取本地文字
       public  String readFileByLines(UUID uuid) {
            File file = new
 
 File("F:/text/"+uuid+".txt");
            BufferedReader reader = null;
            String content="";
            try {
                System.out.println("以行為單位讀取檔案內容，一次讀一整行：");
                reader = new BufferedReader(new FileReader(file));
                String tempString = null;
                int line = 1;
                // 一次讀入一行，直到讀入null為檔案結束
                while ((tempString = reader.readLine()) != null) {
               //加上p標籤 ，前臺顯示可以換行 
               tempString="<p>"+tempString+"</p>";
                // 顯示行號
                                    System.out.println("line?????????????????????????????????? " + line + ": " + tempString);
                    content=tempString;
                    line++;
                }
            }catch(IOException e){

            }
            return content;
       }
}