Java 写入TXT文件，读取TXT文件

清疚 2022-04-13 14:26 358阅读 0赞

作者：LoveEmperor-王子様

#### Java 写入TXT文件，读取TXT文件 ####

> 如果TXT有乱码，请检查编译器的编码设置，某个文件的编码设置，然后重启  
> 输入写入参数需要修改为字符串，然后传参，这里是外部数据调用写TXT文件

public class TxtExport {
        private static String path = "D:/";
        private static String filenameTemp;
    
        public static void main(String[] args) throws IOException {
    //        TxtExport.creatTxtFile();
    //        TxtExport.writeTxtFile("TXT文件TXT文件TXT文件");
    
    //        String res = readTxtFunc(filenameTemp);
        }
    
        public static boolean doTxtExportFunc(List<AuthSysLogsDto> vo)throws IOException{
                boolean Bool =  TxtExport.creatTxtFile();
                boolean writeBool = false;
                if (Bool){
                    writeBool =  TxtExport.writeTxtFile(vo);
                }
    //            String res = readTxtFunc(filenameTemp);
    
                return writeBool;
        }
    
        /**
         * 创建文件
         *
         * @throws IOException
         */
        public static boolean creatTxtFile() throws IOException {
            boolean flag = false;
            Calendar now = Calendar.getInstance();
            filenameTemp = path + "DHTGMIS_"+now.get(Calendar.YEAR)+ (now.get(Calendar.MONTH) + 1)
                    + now.get(Calendar.DAY_OF_MONTH)+".txt";
            File filename = new File(filenameTemp);
            if (!filename.exists()) {
                filename.createNewFile();
                flag = true;
            }
            return flag;
        }
    
    
        /**
         * 写文件
         *
         * @param vo
         *            新内容
         * @throws IOException
         */
        public static boolean writeTxtFile(List<AuthSysLogsDto> vo) throws IOException {
            // 先读取原有文件内容，然后进行写入操作
            boolean flag = false;
    
    
            File readFile=new File(filenameTemp);
    
            String encoding="Unicode"; //字符编码
            OutputStreamWriter tofile = new OutputStreamWriter(new FileOutputStream(readFile),"GBK");
            BufferedWriter out=new BufferedWriter(tofile);
            try {
                JSONArray json = JSONArray.fromObject(vo);
    //            JSONObject jsonObject = JSONObject.fromObject(vo);
                byte data[] = json.toString().getBytes();
                out.write(new String(data,"GBK"));
                flag = true;
            }catch (Exception e){
                e.printStackTrace();
            }
            out.flush();
            out.close();
            return flag;
        }
    
        public static String readTxtFunc(String fileName){
            String fileContent = "";
            try
            {
                File f = new File(fileName);
                if(f.isFile()&&f.exists())
                {
                    InputStreamReader read = new InputStreamReader(new FileInputStream(f),"UTF-8");
                    BufferedReader reader=new BufferedReader(read);
                    String line;
                    while ((line = reader.readLine()) != null)
                    {
                        fileContent += line;
                    }
                    read.close();
                }
            } catch (Exception e)
            {
                e.printStackTrace();
            }
            System.out.print(fileContent);
            return fileContent;
        }
    
    }