未解决Java类的问题
在使用JSP和Java时,我发现一个错误,说明无法解决DbSettings 我已经创建了类DbSettings,它在我的构建文件夹中,DbSettings.java在我的源文件夹中 以下是stacktrace:未解决Java类的问题,java,jsp,Java,Jsp,在使用JSP和Java时,我发现一个错误,说明无法解决DbSettings 我已经创建了类DbSettings,它在我的构建文件夹中,DbSettings.java在我的源文件夹中 以下是stacktrace: An error occurred at line: 53 in the jsp file: /currency_form.jsp DbSettings cannot be resolved 50: ResultSet rs = null; 51: Str
An error occurred at line: 53 in the jsp file: /currency_form.jsp
DbSettings cannot be resolved
50: ResultSet rs = null;
51: String message = null;
52: try {
53: rs = DbSettings
54: .getResultSet("SELECT BLMBG_CURR_CODE,BLMBG_CURR_NAME FROM AON_CURRENCY_SDO ORDER BY BLMBG_CURR_NAME");
55: fEmptyRecordset = rs.first();
56: } catch (Exception ex) {
Stacktrace:
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:103)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:366)
org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:476)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:378)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:353)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:340)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:657)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
Java代码:
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
public class DbSettings {
private static Connection getConnection() throws Exception {
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection conn = null;
conn = DriverManager.getConnection(
"jdbc:oracle:thin:@uschduxcls004sg08:xxxx:xxxxx",
"xxxxx", "xxxx");
return conn;
}
public static final ResultSet getResultSet(String command) throws Exception {
Connection conn = getConnection();
Statement stmt = null;
stmt = conn.createStatement();
System.out.println("Statement was Succesful");
ResultSet rs = null;
rs = stmt.executeQuery(command);
System.out.println("Query was Succesful");
return rs;
}
}
JSP代码:
//声明变量
boolean fEmptyRecordset, fFirstPass, fNeedRecordset;
int i; // as Integer
fEmptyRecordset = false;
fFirstPass = true;
fNeedRecordset = true;
ResultSet rs = null;
String message = null;
try {
rs = DbSettings
.getResultSet("SELECT BLMBG_CURR_CODE,BLMBG_CURR_NAME FROM AON_CURRENCY_SDO ORDER BY BLMBG_CURR_NAME");
fEmptyRecordset = rs.first();
} catch (Exception ex) {
fEmptyRecordset = true;
message = ex.getMessage();
}
String aMonth = "";
int aDate, aYear;
if ("results".compareToIgnoreCase(request.getParameter("action")) == 0) {
aMonth = request.getParameter("selMonth");
aDate = Integer.parseInt(request.getParameter("selDate"));
aYear = Integer.parseInt(request.getParameter("selYear"));
} else {
switch (Calendar.getInstance().get(Calendar.MONTH)) {
case Calendar.JANUARY:
aMonth = "JAN";
case Calendar.FEBRUARY:
aMonth = "FEB";
case Calendar.MARCH:
aMonth = "MAR";
case Calendar.APRIL:
aMonth = "APR";
case Calendar.MAY:
aMonth = "MAY";
case Calendar.JUNE:
aMonth = "JUN";
case Calendar.JULY:
aMonth = "JUL";
case Calendar.AUGUST:
aMonth = "AUG";
case Calendar.SEPTEMBER:
aMonth = "SEP";
case Calendar.NOVEMBER:
aMonth = "NOV";
case Calendar.DECEMBER:
aMonth = "DEC";
}
aDate = Calendar.getInstance().get(Calendar.DAY_OF_MONTH);
aYear = Calendar.getInstance().get(Calendar.YEAR);
}
if (message != null || fEmptyRecordset) {
out.println("<tr><td>");
out.println(message);
out.println("</td></tr>");
%>
布尔fEmptyRecordset、fFirstPass、fNeedRecordset;
int i;//作为整数
fEmptyRecordset=false;
fFirstPass=真;
fNeedRecordset=true;
结果集rs=null;
字符串消息=null;
试一试{
rs=DbSettings
.getResultSet(“按BLMBG_CURR_NAME从AON_CURRENCY_SDO订单中选择BLMBG_CURR_CODE、BLMBG_CURR_NAME”);
fEmptyRecordset=rs.first();
}捕获(例外情况除外){
fEmptyRecordset=true;
message=ex.getMessage();
}
字符串aMonth=“”;
一年一次;
if(“results.compareToIgnoreCase(request.getParameter(“action”))==0){
aMonth=request.getParameter(“selMonth”);
aDate=Integer.parseInt(request.getParameter(“selDate”);
aYear=Integer.parseInt(request.getParameter(“selYear”);
}否则{
开关(Calendar.getInstance().get(Calendar.MONTH)){
案件日历:1月1日:
aMonth=“JAN”;
案件日历。2月:
aMonth=“二月”;
案件日历。3月:
aMonth=“MAR”;
案件日历。4月:
aMonth=“APR”;
案件日历。可:
aMonth=“MAY”;
案件日历6月1日:
aMonth=“JUN”;
案件日历:7月1日:
aMonth=“JUL”;
案件日历8月1日:
aMonth=“八月”;
案件日历:9月1日:
aMonth=“SEP”;
案件日历:11月1日:
aMonth=“NOV”;
案件日历:12月1日:
aMonth=“DEC”;
}
aDate=Calendar.getInstance().get(Calendar.DAY\u OF\u MONTH);
aYear=Calendar.getInstance().get(Calendar.YEAR);
}
if(message!=null | | fEmptyRecordset){
out.println(“”);
out.println(消息);
out.println(“”);
%>
检查您是否在JSP中正确导入了DBSetting
类
在JSP中可以使用import
语句,但语法与普通Java略有不同
这是一个页面指令
。页面指令可以包含所有导入包的列表。要导入多个项目,请用逗号分隔包名,例如
一般语法:
您必须使用完全限定的类名或为DBSettings类添加导入
例如,导入列表类
<%@ page import="java.util.List" %>
您是否也可以提供JSP文件?您已经用JSP导入了您的类。有关更多信息,请查看更新的JSP代码,我相信是的。我已经在页面顶部添加了JSP文件,但仍然遇到同样的问题