jsp页面怎么互传数据

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我是靠谱客的博主俭朴猫咪，这篇文章主要介绍jsp页面怎么互传数据，现在分享给大家，希望可以做个参考。

HTTP是无状态的协议。Web页面本身无法向下一个页面传递信息，如果需要让下一个页面得知该页面中的值，除非通过服务器。因此，Web页面保持状态并传递给其它页面，是一个重要的技术。

Web页面之间传递数据，是Web程序的重要功能

在此结束2种方法来完成这件事情：

1)URL传值；

2）表单传值；

一、URL传值

将页面1中的值传给页面

index.jsp页面:

复制代码<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0"> 
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
</head>
<body>
<%
String str="318";
int number=Integer.parseInt(str);
%>
该数的平方为：<%=number*number %> <hr>
<a href="get_index.jsp?number=<%=number %>">到达get_index</a> 
</body>
</html>1
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0"> 
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
</head>
<body>
<%
String str="318";
int number=Integer.parseInt(str);
%>
该数的平方为：<%=number*number %> <hr>
<a href="get_index.jsp?number=<%=number %>">到达get_index</a> 
</body>
</html>
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get_index.jsp页面

复制代码<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head> 
    <title>My JSP 'get_index.jsp' starting page</title> 
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
  </head> 
  <body>
    <%
    	//获得number
    	String str=request.getParameter("number");
    	int number=Integer.parseInt(str);
     %>
     	该数字的立方为：<%=number*number*number %> <hr>
  </body>
</html>1
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head> 
    <title>My JSP 'get_index.jsp' starting page</title> 
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
  </head> 
  <body>
    <%
    	//获得number
    	String str=request.getParameter("number");
    	int number=Integer.parseInt(str);
     %>
     	该数字的立方为：<%=number*number*number %> <hr>
  </body>
</html>
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页面显示结果：

优点：

简单性和平台支持的多样性（没有浏览器不支持URL）。

缺点：

1）传输的数据只能是字符串，对数据类型具有一定的限制；

2）传输数据的值会在浏览器地址栏里面被看到，从保密的角度讲，这是不安全的。特别是秘密性要求比较严格的数据，比如说密码。

二、表单传值

方法一中通过URL传的值会被看到，为了避免这个问题，我们可以使用表单将页面1中的变量传给页面2。

index.jsp:

复制代码<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>My JSP 'index.jsp' starting page</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
  </head>
  <body>
  <%
  	String str="10";
  	int number=Integer.parseInt(str);
   %>
   	该数的平方为：<%=number*number %>  <hr>
   	<form action="get_index.jsp" method="post">
   		<input type="text" name="number" value="<%=number %>">
   		<input type="submit" value="到达get_index">
   	</form>	
  </body>
</html>1
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>My JSP 'index.jsp' starting page</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
  </head>
  <body>
  <%
  	String str="10";
  	int number=Integer.parseInt(str);
   %>
   	该数的平方为：<%=number*number %>  <hr>
   	<form action="get_index.jsp" method="post">
   		<input type="text" name="number" value="<%=number %>">
   		<input type="submit" value="到达get_index">
   	</form>	
  </body>
</html>
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get_index.jsp:

复制代码<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head> 
    <title>My JSP 'get_index.jsp' starting page</title> 
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
  </head> 
  <body>
    <%
    	//获得number
    	String str=request.getParameter("number");
    	int number=Integer.parseInt(str);
     %>
     	该数字的立方为：<%=number*number*number %> <hr>
  </body>
</html>1
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<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head> 
    <title>My JSP 'get_index.jsp' starting page</title> 
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
  </head> 
  <body>
    <%
    	//获得number
    	String str=request.getParameter("number");
    	int number=Integer.parseInt(str);
     %>
     	该数字的立方为：<%=number*number*number %> <hr>
  </body>
</html>
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