Question

初学ireport，遇到问题，求指导：An error occurred at line: 20 in the jsp file: /reportRun.jsp Jaspe

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="net.sf.jasperreports.engine.*"%>
<%@ page import="java.util.*"%>
<%@ page import="java.io.*"%>
<%@ page import="java.sql.*"%>
<%
String ctxpath = request.getContextPath();
Class.forName("com.mysql.jdbc.Driver");
String url = "jdbc:mysql://localhost:3306/ireport";
String user = "root";
String password = "123";
Connection conn = DriverManager.getConnection(url, user, password);

File reportFile = new File(this.getServletContext().getRealPath(
"/report2.jasper"));
Map parameters = new HashMap();
try {

JasperRunManager.runReportToHtmlFile(reportFile.getPath(),parameters, conn);
response.sendRedirect(ctxpath + "/myreport.html");
} catch (Exception e) {
System.out.println(e.getMessage());
} finally {
try {
conn.close();
} catch (Exception ex) {
System.out.println(ex.getMessage());
} }
%>
运行后出现错误：An error occurred at line: 20 in the jsp file: /reportRun.jsp
JasperRunManager cannot be resolved
17: Map parameters = new HashMap();
18: try {
19:
20: JasperRunManager.runReportToHtmlFile(reportFile.getPath(),parameters, conn);
21: response.sendRedirect(ctxpath + "/myreport.html");
22: } catch (Exception e) {
23: System.out.println(e.getMessage());

Answer 1

看看reportFile对象是不是为空，直接这样获取不太对，试试绝对地址。application.getRealPath ("/report2.jaspe")

Answer 2

提示是这一行出错

JasperRunManager.runReportToHtmlFile(reportFile.getPath(),parameters, conn);

是不是你没有引全包？

追问

我把Jasper所有的包都引进去了，不应该是包的问题吧！谢谢。。

追答

这就不知道了，
有没有可能你使用的三个参数，有那个对象是null了？