ssh 查询后台数据库集合显示在前端页面上

短命女 2022-02-20 10:53 230阅读 0赞

### ***前提*** ###

ssh环境的搭建

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### ***java代码*** ###

1、继承requestAware接口

2、把集合作为一个元素封装在map里面

package cn.com.service;
    import java.util.List;
    import java.util.Map;
    import org.apache.struts2.interceptor.RequestAware;
    import org.hibernate.Query;
    import org.hibernate.Session;
    import org.hibernate.SessionFactory;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.context.annotation.Scope;
    import org.springframework.stereotype.Repository;
    import org.springframework.transaction.annotation.Transactional;
    
    import cn.com.bean.Posted;
    @Repository(value = "queryPosted")
    @Scope("prototype")
    public class QueryPosted implements RequestAware{
    	//可以查询表中所有的数据并且显示在页面上
    	@Autowired
    	private SessionFactory sf;
    	private Map<String, Object> req;
    	public Map<String, Object> getReq() {
    		return req;
    	}
    	public void setReq(Map<String, Object> req) {
    		this.req = req;
    	}
    	@Transactional
    	public String query_all(){
    		//返回数据
    		Session session = sf.getCurrentSession();
    		String sql="from Posted";
    		Query query=session.createQuery(sql);
    		List<Posted> list=query.list();
    		//把数据返回给前台页面
    		req.put("list", list);
    		return "success";
    	}
    	
    	public void setRequest(Map<String, Object> arg0) {
    		// TODO Auto-generated method stub
    		req=arg0;
    	}
    	
    }

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### *** html页面*** ###

***1、s标签***

***2、循环遍历***

<%@ page language="java" import="java.util.*" contentType="text/html;charset=utf-8" pageEncoding="UTF-8"%>
    <%@ taglib prefix="s" uri="/struts-tags" %>
    <%
    String path = request.getContextPath();
    String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
    %>
    
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
    <head>
    <base href="<%=basePath%>">
    <title> 显示所有的发帖 </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 username=(String)session.getAttribute("user_name"); %>
    <table>
    <tr><td>种类</td><td>标题</td><td>提问人</td><td>回复数</td></tr>
    
    <s:iterator value="#request.list" var="post">
    				<tr>
    					<td>${post.post_kinds}</td>
    					<td><a href="details.kk?post_id=${post.post_id}">${post.post_title}</a></td>
    					<td>${post.post_byname}</td>
    					<td>${post.answer_num}</td>
    				</tr>
    			</s:iterator>
    </table>
    
    </body>
    </html>

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