我目前有一个网络应用程序，某些类可以连接到我的数据库，但另一个类不能。无论出于何种原因，我已经开始为我的一个类获取此异常。这就是我所做的：
这是程序失败的代码。在我调用此方法之前，我没有连接到数据库：
public SimpleEntry<String, String> loadOrders(File file) {
SimpleEntry<String, String> response = new SimpleEntry<String, String>(
"", "");
PreparedStatement st = null;
ResultSet rs = null;
Connection con = null;
try {
Scanner scan = new Scanner(file);
String header = "";
String trailer = "";
int orderCtr = 0;
int valueCtr = 0;
String request = "";
ArrayList<HashMap<String, String>> orders =
new ArrayList<HashMap<String, String>>();
log.info("Scanning content");
// start to scan content
while (scan.hasNextLine()) {
String line = scan.nextLine();
Scanner sc = new Scanner(line);
sc.useDelimiter("\t");
String type = sc.next();
// differentiates between header, trailer, and content
if (type.equals("H")) {
header = line;
} else if (type.equals("T")) {
trailer = line;
break;
} else {
// begin to enter in data appropriately from method's
// parameter
// key of map = column, value = data being inserted
HashMap<String, String> order = new HashMap<String, String>();
// Format:
/*
* CLIENT_CUSTOMER_ID, FIRST_NAME, LAST_NAME,___, ADDRESS1,
* ADDRESS2, CITY, STATE, POSTAL_CODE, PHONE, EMAIL_ADDRESS,
* STORE_NUMBER, DELIVERY_METHOD,___, REWARD_VALUE,___,___,
* CARD_ACTIVE_DATE, CARD_EXPIRED_DATE, REQUEST
*/
order.put("CLIENT_CUSTOMER_ID", sc.next());
String name = sc.next();
order.put("FIRST_NAME", name.substring(0, 1).toUpperCase()
+ name.substring(1).toLowerCase());
name = sc.next();
order.put("LAST_NAME", name.substring(0, 1).toUpperCase()
+ name.substring(1).toLowerCase());
sc.next();
order.put("ADDRESS1", sc.next());
order.put("ADDRESS2", sc.next());
order.put("CITY", sc.next());
order.put("STATE", sc.next());
order.put("POSTAL_CODE", sc.next());
order.put("PHONE", sc.next());
order.put("EMAIL_ADDRESS", sc.next());
order.put("STORE_NUMBER", sc.next());
order.put("DELIVERY_METHOD", sc.next());
sc.next();
// purpose of valueCtr -> count reward values for a total
String oVal = sc.next();
valueCtr += Integer.parseInt(oVal);
order.put("REWARD_VALUE", oVal);
sc.next();
sc.next();
order.put("CARD_ACTIVE_DATE", sc.next());
order.put("CARD_EXPIRED_DATE", sc.next());
// used later in program
request = sc.next();
order.put("REQUEST", request);
orders.add(order);
// count number of orders
orderCtr++;
}
sc.close();
}
scan.close();
log.info("Scanning complete");
// finds if the trailer contains the correct value and order amount
boolean ok = true;
if (!trailer.contains(Integer.toString(valueCtr))) {
ok = false;
}
if (!trailer.contains(Integer.toString(orderCtr))) {
ok = false;
}
// if the trailer doesnt, throw error
if (!ok) {
log.error("Error in loadOrders: Order Count
and/or total value of file \n does not match trailer amounts");
response = new SimpleEntry<String, String>("ERROR",
"Order Count and/or total value of file \n does
not match trailer amounts");
return response;
}
String className = "oracle.jdbc.driver.OracleDriver";
Class.forName(className);
con = DriverManager.getConnection(Env.getCardUrl(),
Env.getCardUser(), Env.getCardPass());
log.info("Starting insertion statement");
String query = "SELECT MAX(BATCH_ID) + 1 FROM INTEGRATION.OL_ORDER";
st = con.prepareStatement(query);
rs = st.executeQuery();
rs.next();
int batch = rs.getInt(1);
String insert = "INSERT INTO INTEGRATION.OL_ORDER ("
+ "BATCH_ID, "
+ "CLIENT_CUSTOMER_ID, "
+ "FIRST_NAME, "
+ "LAST_NAME, "
+ "ADDRESS1, "
+ "ADDRESS2, "
+ "CITY, "
+ "STATE, "
+ "POSTAL_CODE, "
+ "PHONE, "
+ "EMAIL_ADDRESS, "
+ "STORE_NUMBER, "
+ "DELIVERY_METHOD, "
+ "REWARD_VALUE, "
+ "CARD_ACTIVE_DATE, "
+ "CARD_EXPIRED_DATE, "
+ "REQUEST,"
+ "PASSPHRASE, "
+ "ITEM_CODE, "
+ "CONFIRMED_MAILADDR, "
+ "JET_CLIENT_ID) VALUES(?, ?, ?, ?, ?, ?, ?,
?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)";
st = con.prepareStatement(insert);
log.info("Insertion complete, reorganizing data");
// add batch
for (HashMap<String, String> o : orders) {
st.setInt(1, batch);
// first, last, address1, address2, city, state, postal, phone,
// storenum, delivery
// validation and formatting
ArrayList<String> content = validateContent(
o.get("FIRST_NAME"), o.get("LAST_NAME"),
o.get("ADDRESS1"), o.get("ADDRESS2"), o.get("CITY"),
o.get("STATE"), o.get("POSTAL_CODE"), o.get("PHONE"),
o.get("STORE_NUMBER"), o.get("DELIVERY_METHOD"));
st.setString(2, o.get("CLIENT_CUSTOMER_ID"));
st.setString(3, content.get(0));
st.setString(4, content.get(1));
st.setString(5, content.get(2));
st.setString(6, content.get(3));
st.setString(7, content.get(4));
st.setString(8, content.get(5));
st.setString(9, content.get(6));
st.setString(10, content.get(7));
st.setString(11, o.get("EMAIL_ADDRESS"));
st.setString(12, content.get(8));
st.setString(13, content.get(9));
st.setInt(14, Integer.parseInt(o.get("REWARD_VALUE")));
st.setDate(15, stringToDate(o.get("CARD_ACTIVE_DATE")));
st.setDate(16, stringToDate(o.get("CARD_EXPIRED_DATE")));
st.setString(17, o.get("REQUEST"));
st.setString(18, getRandom());
st.setString(19, "17331-000002");
st.setString(20, "0");
st.setInt(21, 97);
st.addBatch();
}
st.executeBatch();
log.info("Reorganization complete");
response = new SimpleEntry<String, String>(Integer.toString(batch),
request);
} catch (Exception e) {
StringWriter errors = new StringWriter();
e.printStackTrace(new PrintWriter(errors));
String temp = errors.toString();
log.fatal("Error inside loadOrders(): " + temp);
return null;
} finally {
Dir.close(rs, st, con);
}
return response;
}
我的Dir.close代码：
public static void close(ResultSet rs, Statement ps, Connection conn) {
Logger logger =LogManager.getLogger("AE");
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
logger.error("The result set cannot be closed.", e);
}
}
if (ps != null) {
try {
ps.close();
} catch (SQLException e) {
logger.error("The statement cannot be closed.", e);
}
}
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
logger.error("The data source connection cannot be closed.", e);
}
}
}
答案 0 :(得分：0)
正如我在上一篇评论中提到的，JAR是在webapp的课程上，这意味着错误不会由于缺乏驱动程序而导致。显然，在部署我的WAR文件时，tomcat引用了较旧的WAR文件或代码未使用我上面发布的代码更新的代码。导出我的WAR文件并重命名为任意名称，然后在该名称下部署之后，我再也没有收到错误。要考虑的是我之前的war文件中的代码混乱;我没有正确关闭PreparedStatement，Result，甚至是Connection变量。使用上面发布的代码用不同的名称更新战争。