// 将字符串写入到文本文件中
public void writeTxtToFile(String strcontent, String filePath, String fileName) {
//生成文件夹之后,再生成文件,不然会出错
makeFilePath(filePath, fileName);
String strFilePath = filePath + fileName;
// 每次写入时,都换行写
String strContent = strcontent + "\r\n";
try {
File file = new File(strFilePath);
if (!file.exists()) {
Log.d("TestFile", "Create the file:" + strFilePath);
file.getParentFile().mkdirs();
file.createNewFile();
}
RandomAccessFile raf = new RandomAccessFile(file, "rwd");
raf.seek(file.length());
raf.write(strContent.getBytes());
raf.close();
} catch (Exception e) {
Log.e("TestFile", "Error on write File:" + e);
}
}
// 生成文件
public File makeFilePath(String filePath, String fileName) {
File file = null;
makeRootDirectory(filePath);
try {
file = new File(filePath + fileName);
if (!file.exists()) {
file.createNewFile();
}
} catch (Exception e) {
e.printStackTrace();
}
return file;
}
// 生成文件夹
public static void makeRootDirectory(String filePath) {
File file = null;
try {
file = new File(filePath);
if (!file.exists()) {
file.mkdir();
}
} catch (Exception e) {
Log.i("error:", e + "");
}
}
//删除指定txt文件 通过路径
public void deleteFile(String filePath, String fileName) {
File f = new File(filePath + fileName); // 输入要删除的文件位置
if (f.exists()) {
f.delete();
}
}
调用 需要导入fastjson.jar
Map volume_map = new HashMap(); //利用HashMap 用来储存键值对
volume_map.put("sex", sex_value); //性别
volume_map.put("neck", neck_value); //领围
volume_map.put("bust", bust_value); //胸围
String volume_json = JSON.toJSONString(volume_map); //调用fastjson包 将HashMap转化成json格式字符串
String filePath = "/sdcard/Deye/"; //定义量体数据储存位置
String fileName = "volume.txt"; //定义量体数据储存位置
deleteFile(filePath, fileName); //调用方法清除原文件
writeTxtToFile(volume_json, filePath, fileName); //调用方法写入量体信息