下面的代码不会在 jsp 中打印( while{} 中的 out.println )，但它在 Java 程序中的作用就像一个魅力。你能解释一下为什么不能在jsp中打印以及我应该在代码中更改什么吗？谢谢你!
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ page import="java.io.BufferedReader" %>
<%@ page import="java.io.IOException" %>
<%@ page import="java.io.InputStreamReader" %>
<%@ page import="java.io.PrintWriter" %>
<%@ page import="javax.servlet.ServletException" %>
<%@ page import="javax.servlet.http.HttpServlet" %>
<%@ page import="javax.servlet.http.HttpServletRequest" %>
<%@ page import="javax.servlet.http.HttpServletResponse" %>
<%@ page import="java.net.*" %>
<!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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
Test
<%try{
URL url = new URL("http://gesi-ro-test.banat.enelro:8010/dynamic/gesi/ri/elab/endcallrequest/wind.ser?id=008201dfa306f4a6&es=&is=2011/04/20%2013:09:46.593&rt=RE");
BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
String inputLine = "";
while ((inputLine = in.readLine()) != null)
{
out.println(inputLine);
}
in.close();
}catch(Exception e){
out.println(e);
}%>
</body>
</html>
最佳答案
再次检查您的网址。我在另一个网站上尝试了您的代码，它有效:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="java.io.BufferedReader" %>
<%@ page import="java.io.IOException" %>
<%@ page import="java.io.InputStreamReader" %>
<%@ page import="java.io.PrintWriter" %>
<%@ page import="javax.servlet.ServletException" %>
<%@ page import="javax.servlet.http.HttpServlet" %>
<%@ page import="javax.servlet.http.HttpServletRequest" %>
<%@ page import="javax.servlet.http.HttpServletResponse" %>
<%@ page import="java.net.*" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!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>Test</title>
</head>
<body>
<%
URL url;
try {
url = new URL("http://www.w3schools.com/xml/note.xml");
BufferedReader in = new BufferedReader(new InputStreamReader(
url.openStream()));
String inputLine = "";
while ((inputLine = in.readLine()) != null) {
%>
<c:out value="<%=inputLine%>"/>
<%
}
in.close();
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
%>
</body>
</html>
就我个人而言，我不喜欢在jsp文件中放入很多“if”、“while”命令(这会让你的系统以后变得一团糟)，所以，尽量在你的业务逻辑中处理所有的事情，然后将结果作为属性发送到jsp
关于java - 为什么在jsp中不能打印？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/12050256/