我有一个简单的网页项目，只需点击一下按钮就可以改变另一行文字。我想要的是一个core Java方法，它将识别何时在Tomcat服务器上部署.war文件。
我想输出部署发生的确切时间。我准备好了代码，我希望它在core Java。
是否有任何此类方法可以让我在部署发生时执行某些活动？
答案 0 :(得分：2)
您可以使用ServletContextListener。
在// Database name definitions
public static final String DATABASE_NAME = "MMPDB.db";
// Table name definitions
public static final String LOG_IN_TABLE = "LogIn";
public static final String FI_GOODS_DETAIL_TABLE = "fiGoodDetail";
public static final String FI_GOODS_SUMMARY_TABLE = "fiGoodSummary";
public static final String ITEM_DETAIL_TABLE = "itemDetail";
public static final String SETTINGS_TABLE = "Setting";
// LogIn table fields declaration
public static final String LOGIN_USERNAME = "userName";
public static final String LOGIN_PASSWORD = "password";
// fiGoodDetail table fields declaration
public static final String FIGOODSDETAIL_FINISHGOODS = "fiGoods";
public static final String FIGOODSDETAIL_ITEMDESC = "itemDesc";
public static final String FIGOODSDETAIL_FINISHQTY = "fiQty";
public static final String FIGOODSDETAIL_FINISHUNITWEIGHT = "fiUnitWeight";
public static final String FIGOODSDETAIL_FINISHTOTALWEIGHT = "fiTotalWeight";
public static final String FIGOODSDETAIL_LOTBINNUM = "lotBinNum";
// fiGoodSummary table fields declaration
public static final String FIGOODSSUMMARY_FINISHGOODS = "fiGoods";
public static final String FIGOODSSUMMARY_FINISHQTY = "fiQty";
public static final String FIGOODSSUMMARY_FINISHUNITWEIGHT = "fiUnitWeight";
public static final String FIGOODSSUMMARY_FINISHTOTALWEIGHT = "fiTotalWeight";
public static final String FIGOODSSUMMARY_ITEMDESC = "itemDesc";
public static final String FIGOODSSUMMARY_QTYUM = "qtyUm";
public static final String FIGOODSSUMMARY_QTY = "qty";
public static final String FIGOODSSUMMARY_YIELD = "yield";
// itemDesc table fields declaration
public static final String ITEMDETAIL_FINISHGOODS = "fiGoods";
public static final String ITEMDETAIL_ITEMDESC = "itemDesc";
public static final String ITEMDETAIL_LOCTID = "loctId";
public static final String ITEMDETAIL_LOTBINNUM = "lotBinNum";
public static final String ITEMDETAIL_QTYUM = "qtyUm";
public static final String ITEMDETAIL_QTYUMUSED = "qtyUmUsed";
public static final String ITEMDETAIL_YIELD = "yield";
public static final String ITEMDETAIL_ACTUALQTY = "actQty";
public static final String ITEMDETAIL_ACTUALSCARP = "actScrp";
public static final String ITEMDETAIL_UNITCOST = "unitCost";
public static final String ITEMDETAIL_TOTALCOST = "totalCost";
// Setting table fields declaration
public static final String SETTINGS_SERVERPATH = "serverPath";
// public static final String SETTINGS_COMPANY="company";
// Creation of Query for Each Table.
// tlogin table creation query
public static final String LOG_IN_TABLE_CREATE_QUERY = "CREATE TABLE "
+ LOG_IN_TABLE + "(" + LOGIN_USERNAME + " TEXT,"
+ LOGIN_PASSWORD + " TEXT);";
// tfigodet table creation query
public static final String FI_GOODS_DETAIL_TABLE_CREATE_QUERY = "CREATE TABLE "
+ FI_GOODS_DETAIL_TABLE + "(" + FIGOODSDETAIL_FINISHGOODS + " TEXT,"
+ FIGOODSDETAIL_ITEMDESC + " TEXT,"
+ FIGOODSDETAIL_FINISHQTY + " TEXT,"
+ FIGOODSDETAIL_FINISHUNITWEIGHT + " TEXT,"
+ FIGOODSDETAIL_FINISHTOTALWEIGHT + " TEXT,"
+ FIGOODSDETAIL_LOTBINNUM + " TEXT);";
// tfigosum table creation query
public static final String FI_GOODS_SUMMARY_TABLE_CREATE_QUERY = "CREATE TABLE "
+ FI_GOODS_SUMMARY_TABLE
+ "("
+ FIGOODSSUMMARY_FINISHGOODS
+ " TEXT,"
+ FIGOODSSUMMARY_FINISHQTY
+ " TEXT,"
+ FIGOODSSUMMARY_FINISHUNITWEIGHT
+ " TEXT,"
+ FIGOODSSUMMARY_FINISHTOTALWEIGHT
+ " TEXT,"
+ FIGOODSSUMMARY_ITEMDESC
+ " TEXT,"
+ FIGOODSSUMMARY_QTYUM
+ " TEXT,"
+ FIGOODSSUMMARY_QTY
+ " TEXT,"
+ FIGOODSSUMMARY_YIELD
+ " TEXT);";
// titemdet table creation query
public static final String ITEM_DETAIL_TABLE_CREATE_QUERY = "CREATE TABLE "
+ ITEM_DETAIL_TABLE + "(" + ITEMDETAIL_FINISHGOODS + " TEXT,"
+ ITEMDETAIL_ITEMDESC + " TEXT," + ITEMDETAIL_LOCTID + " TEXT,"
+ ITEMDETAIL_LOTBINNUM + " TEXT," + ITEMDETAIL_QTYUM + " TEXT,"
+ ITEMDETAIL_YIELD + " TEXT," + ITEMDETAIL_ACTUALQTY + " TEXT,"
+ ITEMDETAIL_QTYUMUSED + " TEXT," + ITEMDETAIL_ACTUALSCARP + " TEXT,"
+ ITEMDETAIL_UNITCOST + " TEXT," + ITEMDETAIL_TOTALCOST + " TEXT);";
// tsettings table creation query
public static final String SETTINGS_TABLE_CREATE_QUERY = "CREATE TABLE "
+ SETTINGS_TABLE + "(" + SETTINGS_SERVERPATH + " TEXT);";
// Constructor to create Database
public MmpDBHelper(Context context) {
DATABASE_FILE_PATH = new File(Supporter.getAppCommonPath(),
DATABASE_NAME);
if (!DATABASE_FILE_PATH.exists()) {
try {
db = SQLiteDatabase.openOrCreateDatabase(DATABASE_FILE_PATH,
null);
// openDatabase();
db.beginTransaction();
db.execSQL(LOG_IN_TABLE_CREATE_QUERY);
db.execSQL(FI_GOODS_DETAIL_TABLE_CREATE_QUERY);
db.execSQL(FI_GOODS_SUMMARY_TABLE_CREATE_QUERY);
db.execSQL(ITEM_DETAIL_TABLE_CREATE_QUERY);
db.execSQL(SETTINGS_TABLE_CREATE_QUERY);
db.setTransactionSuccessful();
Log.i("Success", "All tables created successfully");
} catch (Exception e) {
db.endTransaction();
errCode = "Error 501";
msg = "Table creation failed";
errMsg = errCode + " : " + msg;
LogFileCreator.appendLog(errMsg);
} finally {
// db.endTransaction();
db.close();
}
}
}
文件中添加<listener>标记，如下所示：
web.xml并使<listener>
<listener-class>classes.MyListener</listener-class>
</listener>
类实现Java接口。覆盖ServletContextListener方法并在其中编写代码就可以了。
例如：
contextInitialized()希望这有帮助！
答案 1 :(得分：1)
查看是否已在webapps目录中解压缩（展开）WAR文件。通过查看爆炸目录是否存在，可以通过两种不同的方式完成此操作。或者通过查看WAR文件的访问时间。请注意，要查看* nix中文件的访问时间，您必须使用-u命令中的ls选项。
但是这有一个缺陷，你无法分辨web服务何时完成初始化。为此，您可以创建一个keepAlive服务，您可以在Web服务中进行轮询。这样，当您的应用程序完成初始化时，您将获得keepAlive的响应。您可以在此服务上设置高负载数，以允许首先加载所有其他Servlet。
curl "http:localhost:8080/MyWebService/keepAlive"
此外，我特别了解Tomcat，您可以查询其JMX监视器。我不知道它是否有一个JMX查询来列出已加载的Servlet，但它可能并且它是可扩展的，因此您可以添加自己的查询以找出它。
编辑：您还可以设置Servlet在初始化时进行记录。然后在循环中只有grep "your services' log msg"，直到它以退出代码0退出。