所以我想使用 fusioncharts 从 jsp 创建图表。我会选择 fusioncharts，然后选择 JFree、canvasjs 或任何其他，因为我有在 php 语言中使用它的经验。在jsp中应该没有问题，因为jsp和php实际上是相同的，映射在html之上，唯一的区别是它们的语法。但是，正如我完成的代码一样，它返回 Stringliteral is notproperly close by a double-quote error on sql 语句。请帮助我，因为我是 jsp 和 java 环境的初学者。谢谢。
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@page import="java.sql.*" %>
<%@page import="java.util.*" %>
<%@page import="com.google.gson.*" %>
<%@page import="readConfig.readConfig" %>
<%
String hostdb = readConfig.getProperties("conUrl"); // MySQl host
String userdb = readConfig.getProperties("dbUser"); // MySQL username
String passdb = readConfig.getProperties("dbPass"); // MySQL password
String driver = readConfig.getProperties("dbDriver"); // MySQL driver
DriverManager.registerDriver(new com.mysql.jdbc.Driver());
Connection con = DriverManager.getConnection(hostdb , userdb , passdb);
%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Creating Charts with Data from a Database - fusioncharts.com</title>
<script src="vendor/fusioncharts/fusioncharts.js"></script>
</head>
<body>
<div id="chart"></div>
<%@page import="fusioncharts.FusionCharts" %>
<%
Gson gson = new Gson();
String sql= "SELECT m.month,IFNULL(x.cnt, 0) AS cnt FROM
(SELECT 1 AS month UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9 UNION SELECT 10 UNION SELECT 11 UNION SELECT 12) AS m
LEFT JOIN (SELECT DATE_FORMAT(date, '%c') as month, COUNT(*) AS cnt FROM ssl_sales where YEAR(date)=2017 AND status_ssl='new' GROUP BY month) AS x ON m.month = x.month
ORDER BY m.month DESC";
PreparedStatement pt=con.prepareStatement(sql);
ResultSet rs=pt.executeQuery();
Map<String, String> chartobj = new HashMap<String, String>();
chartobj.put("caption", "Top 10 most populous countries");
chartobj.put("showValues", "0");
chartobj.put("theme", "zune");
ArrayList arrData = new ArrayList();
while(rs.next()) {
Map<String, String> lv = new HashMap<String, String>();
lv.put("label", rs.getString("Monthly"));
lv.put("value", rs.getString("New Demand"));
arrData.add(lv);
}
rs.close();
Map<String, String> dataMap = new LinkedHashMap<String, String>();
dataMap.put("chart", gson.toJson(chartobj));
dataMap.put("data", gson.toJson(arrData));
FusionCharts columnChart= new FusionCharts(
"column2d",
"chart1",
"500","300",
"chart",
"json",
gson.toJson(dataMap)
);
%>
<%=columnChart.render()%>
</body>
eclipse 终端出错
Mar 27, 2018 2:07:17 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [jsp] in context with path [/registration] threw exception [Unable to compile class for JSP:
An error occurred at line: 78 in the jsp file: /dashboard.jsp
String literal is not properly closed by a double-quote
75:
76:
77: // Form the SQL query that returns the number of sales in 2017
78: String sql= "SELECT m.month, IFNULL(x.cnt, 0) AS cnt FROM
79: (SELECT 1 AS month UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9 UNION SELECT 10 UNION SELECT 11 UNION SELECT 12) AS m
80: LEFT JOIN (SELECT DATE_FORMAT(date, '%c') as month, COUNT(*) AS cnt FROM ssl_sales where YEAR(date)=2017 AND status_ssl='new' GROUP BY month) AS x ON m.month = x.month
81: ORDER BY m.month DESC";
Stacktrace:] with root cause
org.apache.jasper.JasperException: Unable to compile class for JSP:
An error occurred at line: 78 in the jsp file: /dashboard.jsp
String literal is not properly closed by a double-quote
75:
76:
77: // Form the SQL query that returns the number of sales in 2017
78: String sql= "SELECT m.month, IFNULL(x.cnt, 0) AS cnt FROM
79: (SELECT 1 AS month UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9 UNION SELECT 10 UNION SELECT 11 UNION SELECT 12) AS m
80: LEFT JOIN (SELECT DATE_FORMAT(date, '%c') as month, COUNT(*) AS cnt FROM ssl_sales where YEAR(date)=2017 AND status_ssl='new' GROUP BY month) AS x ON m.month = x.month
81: ORDER BY m.month DESC";
最佳答案
在 Java 中字符串文字不允许超过一行。
所以你可以使用'+'像
String sql= "SELECT m.month,IFNULL(x.cnt, 0) AS cnt FROM "+
" (SELECT 1 AS month UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9 UNION SELECT 10 UNION SELECT 11 UNION SELECT 12) AS m "+
" LEFT JOIN (SELECT DATE_FORMAT(date, '%c') as month, COUNT(*) AS cnt FROM ssl_sales where YEAR(date)=2017 AND status_ssl='new' GROUP BY month) AS x ON m.month = x.month "+
" ORDER BY m.month DESC";
或者写在一行
String sql="SELECT m.month,IFNULL(x.cnt, 0) AS cnt FROM (SELECT 1 AS month UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9 UNION SELECT 10 UNION SELECT 11 UNION SELECT 12) AS m LEFT JOIN (SELECT DATE_FORMAT(date, '%c') as month, COUNT(*) AS cnt FROM ssl_sales where YEAR(date)=2017 AND status_ssl='new' GROUP BY month) AS x ON m.month = x.month ORDER BY m.month DESC";
关于mysql - jsp字符串文字错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/49504406/