我无法让 JSP 页面识别我的 Java 类(DbSettings) 我相信下面我的文件目录设置正确。
问题在这一行崩溃:
rs = DbSettings.getResultSet
有人能指出我如何解决这个问题的正确方向吗？
已解决:必须将类导入到 JSP 文件中 在顶部添加了导入。
<%@page import="classes.DbSettings" %>
<%@page import="classes.DateValidator" %>
文件目录: 项目名称:货币
Currency
-Deployment Description
-JAX-WS Web Services
-Java Resources
--src
---classes (Package)
----DateValidator.java
----DbSettings.java
--Libraries
----Apache
----EAR Libraries
----JRE
----Web App
-JavaScript Resources (default sub cats)
-build
-libs
ojdbc7.jar
-WebContent
--META-INF
--WEB-INF
---file.jsp
---file.jsp
---file.jsp
X .classpath
X .project
DbSettings.java(无法在 JSP 文件中识别此类)
package classes; <--- New Package
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:@uschduxcls004sg09:1527:xxxxx", "xxxxx",
"xxxxx");
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 文件片段:
<%@page import="java.util.Calendar"%>
<%@page import="java.sql.ResultSet"%>
<%@page import="classes.DbSettings" %>
<%@page import="classes.DateValidator" %>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script language="javascript">
// Set frametest1 level
level = 0;
function submitCurrency() {
var valid = checkForm(document.currency_form);
if (valid)
document.currency_form.submit();
}
function checkForm(theForm) {
// This function validates the entries entered by the user before passing the values
// to the next page.
// Check number of units
if (theForm.txtUnits.value == "") {
alert("Please enter the number of units you wish to convert.");
theForm.txtUnits.focus();
return (false);
} else {
result = isNaN(theForm.txtUnits.value);
if (result == true) {
alert("Please enter only numeric values in the \"Units\" field. No commas or other characters are needed or recognized.");
theForm.txtUnits.focus();
return (false);
}
}
return true;
}
</script>
</head>
<body>
<%
// Declare variables
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>");
%>
<%
} else {
%>
堆栈跟踪
org.apache.jasper.JasperException: Unable to compile class for JSP:
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:485)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:379)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:354)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:341)
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:395)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:339)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
最佳答案
现代 Java 不鼓励使用不在包内的类，以至于它们在许多情况下不起作用。将您的类放入包中(在 .java 文件顶部使用 package 语句)——所有这些包。
关于java - 无法使用 Eclipse Juno 编译 JSP 类，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/27832176/