JavaWeb项目查询数据库获得数据显示在jsp页面上

showall.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>  
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!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">
<base href="<%=basePath%>">
<title>所有用户页面</title>
</head>
<body>
<h1>${xiaoxi}</h1>
  <table  width="600" border="1" cellpadding="0" >
  		<tr>
  			<th>ID</th>
	  		<th>姓名</th>
	  		<th>性别</th>
	  		<th>密码</th>
	  		<th>家乡</th>
	  		<th>备注</th>
	  		<th>操作</th>
  		</tr>
     
	<c:forEach var="U" items="${userAll}" > 
	<form action="UpdateServlet" method="post">
       <tr>
	       <td><input type="text" value="${U.id}" name="id" ></td>
	       <td><input type="text" value="${U.name}" name="name"></td>
	       <td><input type="text" value="${U.sex}" name="sex"></td>
	       <td><input type="text" value="${U.pwd}" name="pwd"></td>
	       <td><input type="text" value="${U.home}" name="home"></td>
	       <td><input type="text" value="${U.info}" name="info"></td>
	       <td><a href="DeleteServlet?id=${U.id}">删除</a>  <input type="submit" value="更新"/></td>
	   </tr>
	</form>
    </c:forEach>  

     
    </table>

</body>
</html>

SearchAllServlet.java程序如下,导包之类的略

public class SearchAllServlet extends HttpServlet{

	@Override
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		doPost(request,response);
	}

	@Override
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub
		UserDao ud = new UserDaoImpl();
		List<User> userAll = ud.getUserAll();
		request.setAttribute("userAll", userAll);
		request.getRequestDispatcher("/showall.jsp").forward(request, response);
	}
	
}

数据库查询到的所有用户数据保存在List集合userAll中，通过request.setAttribute("userAll",userAll)传入jsp

jsp通过<c:forEach var="U" items="${userAll}" >取出数据并进行遍历

以上，需要注意的是showall中用到了<c:forEach>标签，并且传值的时候使用了el表达式${...}，因此还需要导入包jstl.jar和standard.jar并且在showall.jsp中增加：

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>

ps:所写是在原博主的内容之后的补充

转载原文及源代码链接：https://blog.csdn.net/qq_23994787/article/details/73612870

JavaWeb项目查询数据库获得数据显示在jsp页面上

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