如何从Java的try / catch块中引发异常的那一刻起恢复执行？

问题描述

我的用例要求我检查DBConnections以确保我们具有正确的URL。

说我们有10个Oracle DB的列表，并且DB4的连接URL格式错误。我们想捕获db4连接失败，但仍然要检查列表中所有剩余的DB。

allDBs = {DB1 {用户名，URL，密码}，DB2 {用户名，URL，密码}，.... DB10 {用户名，URL，密码}}

---

DBList <DbDetails> allDBs = new DBList <DbDetails>();
try{
 for(DbDetails db : allDBs)
 {
            dbUrl = db.getDbUrl();
            dbUsername = db.getUserName();
            dbPassword = db.getpass();
            DbDetails dbDetails = new DbDetails(dbUrl,dbUsername,dbPassword);

            dataSource = dbConfig.setorclDataSource(dbDetails);
            conn = dataSource.getConnection();
            String selectQuery = "select 1 from dual";
            sqlFunction sf = new sqlFunction(dataSource,selectQuery);
            sf.compile()
   }
}
catch(sqlException se){
 connFailDBList.add(dbDetail);
 LOG.error(se.getMessage());
}

由于DB4网址格式错误。通过上述逻辑，sqlException被捕获到DB4。但是如何恢复列表中其余DB的检查？

解决方法

只需交换for周期和try-catch：

DBList <DbDetails> allDBs = new DBList <DbDetails>();
for(DbDetails db : allDBs){
 try{
   //  checking connectivity here
 }catch(SQLException se){
   connFailDBList.add(dbDetail);
   LOG.error(se.getMessage());
 }
}

,

只需将try / catch块移至for循环中即可。

DBList<DbDetails> allDBs = new DBList<DbDetails>();

    for (DbDetails db : allDBs) {
        try {
            dbUrl = db.getDbUrl();
            dbUsername = db.getUserName();
            dbPassword = db.getPass();
            DbDetails dbDetails = new DbDetails(dbUrl,dbUsername,dbPassword);

            dataSource = dbConfig.setOrclDataSource(dbDetails);
            conn = dataSource.getConnection();
            String selectQuery = "select 1 from dual";
            SqlFunction sf = new SqlFunction(dataSource,selectQuery);
            sf.compile()
        } catch (SQLException se) {
            connFailDBList.add(dbDetail);
            LOG.error(se.getMessage());
        }
                
    }