在jsp中以表格格式显示记录时遇到问题吗? [英] Problems in displaying record in tabular format in a jsp?
问题描述
因此，我想从文本文件中读取数据并在JSP页面中以表格格式显示记录.我尝试了以下代码，但现在它将所有内容显示在一个列中.我想以适当的表格格式显示它.我在哪里做错了?请任何人纠正我的错误.
So, I want to read data from a text file and display the record in a table format in a JSP page. I tried the following code but for now it displays everything in one column. I want to display it a proper table format. Where am I doing wrong? Please can anyone correct my mistake.
<%@page import="java.io.File"%>
<%@page import="java.io.FileReader"%>
<%@page import="java.io.BufferedReader"%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<h1>Hello World!</h1>
</body>
</html>
<%
FileReader fr = new FileReader(new File(("C:\\Users\\user\\Documents\\NetBeansProjects\\JavaWebApp\\src\\java\\com\\servlets\\records.txt")));
BufferedReader br = new BufferedReader(fr);
String line = null;
out.println("<table>");
out.println("<tr>");
while((line = br.readLine()) != null){
//out.print(line + "<br/>");
String[] data = line.split("\t");
for (String val : data) {
out.println("<td>" + val + "</td>");
out.println("</tr>" );
}
}
out.println("</table>");
br.close();
%>
这是将记录保存在我的文本文件中的方式
These is how the records are saved in my text file
James 1 0098765 California
Maureen 2 0078657 Texas
我的代码结果显示如下
James
1
0098765
California
Maureen
2
0078657
Texas
推荐答案
首先，请勿使用Java代码生成HTML代码.首先读取和处理数据，然后使用JSTL进行显示:
First, do not use Java code to generate HTML code. Read and process data first, then use JSTL to display them:
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@page import="java.io.*, java.util.*"%>
<!DOCTYPE html>
<%
List<List<String>> lines = new ArrayList<>();
String path = "C:\\Users\\user\\Documents\\NetBeansProjects\\JavaWebApp\\src\\java\\com\\servlets\\records.txt";
try (BufferedReader br = new BufferedReader(new FileReader(path))) {
while((line = br.readLine()) != null){
List<String> values = new ArrayList<>();
String[] data = line.split("\t");
for (String val : data) {
data.add(val);
}
lines.add(values);
}
request.addAttribute("lines", lines);
%>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<h1>Hello World!</h1>
<table>
<c:forEach var="line" items="${lines}">
<tr>
<c:forEach var="value" items="${line}>
<td>${value}</td>
</c:forEach>
</tr>
</c:forEach>
</table>
</body>
</html>
第二，完全避免将业务逻辑(即读取和处理文件)放入JSP中-使用 MVC模式，或者至少将代码提取到一个单独的Java类中，然后调用该类的方法来获取要显示的数据.
Second, avoid putting business logic (i.e. reading and processing the file) into JSP at all - use MVC pattern, or at least extract the code into a separate Java class and call the method of that class to get the data for displaying.
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