java 保存和读取本地json文件

保存数据到本地文件

private void saveDataToFile(String fileName,String data) {





		BufferedWriter writer = null;





        File file = new File("d:\\"+ fileName + ".json");





        //如果文件不存在，则新建一个





        if(!file.exists()){





            try {





                file.createNewFile();





            } catch (IOException e) {





                e.printStackTrace();





            }





        }





        //写入





        try {





            writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file,false), "UTF-8"));





            writer.write(data);





        } catch (IOException e) {





            e.printStackTrace();





        }finally {





            try {





                if(writer != null){





                    writer.close();





                }





            } catch (IOException e) {





                e.printStackTrace();





            }





        }





       System.out.println("文件写入成功！");





    }

取数据

private String getDatafromFile(String fileName) {





		





		String Path="d:\\" + fileName+ ".json";





		BufferedReader reader = null;





		String laststr = "";





		try {





			FileInputStream fileInputStream = new FileInputStream(Path);





			InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream, "UTF-8");





			reader = new BufferedReader(inputStreamReader);





			String tempString = null;





			while ((tempString = reader.readLine()) != null) {





				laststr += tempString;





			}





			reader.close();





		} catch (IOException e) {





			e.printStackTrace();





		} finally {





			if (reader != null) {





				try {





					reader.close();





				} catch (IOException e) {





					e.printStackTrace();





				}





			}





		}





		return laststr;





	}