java怎么返回到jsp页面数据 jsp中如何把数据库中查询出来的数据输出到jsp页面。
\u600e\u4e48\u5728jsp\u9875\u9762\u83b7\u53d6java\u5728\u540e\u53f0\u4ea7\u751f\u7684\u53d8\u91cf\u503c\uff0c\u4ee5\u53ca\u4ece\u9875\u9762\u4f20\u8f93\u5c45\u5230java\u7a0b\u5e8f\uff08\u7a0b\u5e8f\u4e0d\u662f\u5d4c\u5728\u9875\u9762\u7684\uff09\u6bd4\u5982\u5728\u540e\u53f0\u8bbe\u7f6e\u4e00\u4e2a\u503c\u5728request\u91cc\u9762\uff0crequest.setAttribute("param",param);
\u5728jsp\u9875\u9762\u5c31\u53ef\u4ee5\u8fd9\u6837\u83b7\u53d6\uff0c${param}; el\u8868\u8fbe\u5f0f\u3002
\u5728\u9875\u9762\u4f20\u503c\u5230\u540e\u53f0\u4e2d\uff0c\u7b2c\u4e00\u79cdpost\u65b9\u5f0f\uff0c\u63d0\u4ea4\u8868\u5355\u65f6\u3002
\u70b9\u51fb\u63d0\u4ea4\u6309\u94ae\u540e\u5728\u540e\u53f0\u83b7\u53d6Username,\u548cpassword
String username =request.getParamter("username");
String password=request.getParamter("password");
\u5982\u679c\u662fget\u65b9\u5f0f\u63d0\u4ea4\u7684\u8bdd
\u4e3e\u4e2a\u4f8b\u5b50\uff1a
\u67e5\u770b
\u90a3\u4e48\u5728\u540e\u5728\u83b7\u53d6\u4e5f\u662f\u4e00\u6837\u7684
String param1=request.getParamter("param1");
1\u3001\u628a\u6570\u636e\u5e93\u5efa\u597d
CREATE TABLE `User` (
`id` int(11) NOT NULL,
`username` varchar(255) DEFAULT NULL,
`password` varchar(255) DEFAULT NULL,
`address` varchar(255) DEFAULT NULL,
PRIMARY KEY (`id`)
)
2\u3001\u63d2\u5165\u4e00\u4e2a\u6570\u636e
insert into User values(1,"Martin","12345","zjut")
3\u3001\u5efa\u7acb\u4e00\u4e2aDynamic Web Project\uff0c\u76ee\u5f55\u5982\u4e0b\uff1a
4\u3001showinfo.jsp\uff0c\u8fd9\u91cc\u9700\u8981\u6ce8\u610f\u7684\u662f\u5bfc\u5165\u7c7b\uff1aimport="com.entity.User"
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8" import="com.entity.User"%>
Insert title here
<%
User user = (User)request.getAttribute("user");
%>
\uff08\u6b64\u5904\u7a7a\u4e00\u884c\uff09
id:
username:
password:
address:
\uff08\u6b64\u5904\u7a7a\u4e00\u884c\uff09
<!--
\u4e5f\u53ef\u4ee5\u7528el\u8868\u8fbe\u5f0f\uff0c\u4f46\u662f\u540c\u6837\u9700\u8981servlet\u5148\u5c06\u503c\u5b58\u653e\u5728request\u4e2d\uff0c\u4f46\u662f\u7528el\u8868\u8fbe\u5f0f\u7684\u8bdd\u9700\u8981\u5728\u4e0a\u9762\u52a0\u4e0a\uff1a
\u5982\u4e0b\uff0c\u83b7\u53d6id\u8fd9\u6837\u5199\u5c31\u53ef\u4ee5
${user.getId()}
-->
5\u3001\u7ed3\u679c\u5982\u4e0b\uff1a
然后再用
request.getRequestDispatcher("页面路径");
这样这个page值就传到指定的页面了。
在页面里面用el表达式，${page} 就取到值了，如果page里有age属性，再${page.age}就是age的值了
通过ajax传json对象到后台，也通过ajax接收咯
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