java字符串转时间戳_java时间戳与字符串相互转换

第一步：创建工具类

/**

* @data on 2020/9/3 10:51 AM

* @auther

* @describe java 时间戳/字符串 之间转换

*/

public class DateUtil {

private static SimpleDateFormat sf = null;

// 将时间戳转成字符串

public static String getDateToString(long time) {

Date d = new Date(time);

sf = new SimpleDateFormat(&＃8220;yyyy-MM-dd HH:mm:ss&＃8221;);

return sf.format(d);

}

//获取当前时间

public static String getCurrentDate() {

Date d = new Date();

sf = new SimpleDateFormat(&＃8220;yyyy-MM-dd HH:mm:ss&＃8221;);

return sf.format(d);

}

//将字符串转换为时间戳

public static long getStringToDate(String time) {

sf = new SimpleDateFormat(&＃8220;yyyy-MM-dd HH:mm:ss&＃8221;);

Date date = new Date();

try {

date = sf.parse(time);

} catch (ParseException e) {

e.printStackTrace();

}

return date.getTime();

}

//直接获取当前时间戳

public static String getTimeStamp() {

String currentDate = getCurrentDate();

sf = new SimpleDateFormat(&＃8220;yyyy-MM-dd HH:mm:ss&＃8221;);

Date date = new Date();

try {

date = sf.parse(currentDate);

} catch (ParseException e) {

e.printStackTrace();

}

return String.valueOf(date.getTime());

}

}

然后，调用就完事儿了！

第二步：xml布局文件展示

xmlns:app=&＃8221;http://schemas.android.com/apk/res-auto&＃8221;

xmlns:tools=&＃8221;http://schemas.android.com/tools&＃8221;

android:layout_width=&＃8221;match_parent&＃8221;

android:layout_height=&＃8221;match_parent&＃8221;

tools:cOntext=&＃8221;.show.Case25&＃8243;

tools:ignore=&＃8221;MissingConstraints&＃8221;>

android:id=&＃8221;@+id/toolbar&＃8221;

android:layout_width=&＃8221;match_parent&＃8221;

android:layout_height=&＃8221;?attr/actionBarSize&＃8221;

android:background=&＃8221;@color/green&＃8221;

app:title=&＃8221;java时间戳转字符串&＃8221;

app:titleTextColor=&＃8221;@color/white&＃8221; />

android:id=&＃8221;@+id/btn_show_time_chuo&＃8221;

android:layout_width=&＃8221;match_parent&＃8221;

app:layout_constraintTop_toBottomOf=&＃8221;@+id/toolbar&＃8221;

android:layout_height=&＃8221;wrap_content&＃8221;

android:text=&＃8221;获取当前时间戳&＃8221; />

android:id=&＃8221;@+id/btn_show_time&＃8221;

android:layout_width=&＃8221;match_parent&＃8221;

app:layout_constraintTop_toBottomOf=&＃8221;@+id/btn_show_time_chuo&＃8221;

android:layout_height=&＃8221;wrap_content&＃8221;

android:text=&＃8221;获取当前时间&＃8221; />

android:id=&＃8221;@+id/btn_change&＃8221;

android:layout_width=&＃8221;match_parent&＃8221;

app:layout_constraintTop_toBottomOf=&＃8221;@+id/btn_show_time&＃8221;

android:layout_height=&＃8221;wrap_content&＃8221;

android:text=&＃8221;时间戳转字符串&＃8221; />

android:id=&＃8221;@+id/btn_change2&＃8243;

android:layout_width=&＃8221;match_parent&＃8221;

app:layout_constraintTop_toBottomOf=&＃8221;@+id/btn_change&＃8221;

android:layout_height=&＃8221;wrap_content&＃8221;

android:text=&＃8221;字符串转时间戳&＃8221; />

android:id=&＃8221;@+id/tv_show&＃8221;

android:layout_marginTop=&＃8221;40dp&＃8221;

android:background=&＃8221;@color/blue&＃8221;

android:textColor=&＃8221;@color/white&＃8221;

android:textSize=&＃8221;20sp&＃8221;

android:gravity=&＃8221;center&＃8221;

tools:text=&＃8221;测试一下&＃8221;

app:layout_constraintTop_toBottomOf=&＃8221;@id/btn_change2&＃8243;

android:layout_width=&＃8221;match_parent&＃8221;

android:layout_height=&＃8221;40dp&＃8221;/>

第三步：调用工具类中的方法，完成转换

public class Case25 extends AppCompatActivity {

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_case25);

Button getTimeChuo = findViewById(R.id.btn_show_time_chuo);

Button getTime = findViewById(R.id.btn_show_time);

Button changeToTime = findViewById(R.id.btn_change);

Button changeToChuo = findViewById(R.id.btn_change2);

TextView tvShow = findViewById(R.id.tv_show);

getTimeChuo.setOnClickListener((View)->{

tvShow.setText(DateUtil.getTimeStamp());

});

getTime.setOnClickListener((View)->{

tvShow.setText(DateUtil.getCurrentDate());

});

changeToTime.setOnClickListener((View)->{

tvShow.setText(DateUtil.getDateToString(1600074914));

});

changeToChuo.setOnClickListener((View)->{

//String.valueof(Long):long转成String类型

tvShow.setText(String.valueOf(DateUtil.getStringToDate(&＃8220;2020-09-18 18:00:00&＃8221;)));

});

}

}