java类向jsp页面传值 java开发的信息系统里，jsp与java文件是怎么传递数据...
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\u63a5\u6536\u9875\u9762
//\u7528\u6765\u8c03\u7528vo
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//\u53d6\u51faVO\u4e2d\u7684\u503c
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js\u4e5f\u53ef\u4ee5\u5411java\u4f20\u503c \u8fd8\u662f\u8868\u5355\u7684\u5173\u7cfb\u4e0a\u4f20\u7684
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\u3000\u3000jsp\u4e0ejava\u6587\u4ef6\u4f20\u9012\u6570\u636e\u53ef\u4ee5\u4f7f\u7528Servlet\u7c7b\u6765\u4f20\u9012\uff0cjsp\u5c06\u6570\u636e\u5b58\u5165\u5230request\u5bf9\u8c61\u4e2d\uff0cServlet\u7c7b\u83b7\u53d6\u8fd9\u4e2arequest\u5bf9\u8c61\uff0c\u5e76\u5c06\u6570\u636e\u53d6\u51fa\u3002\u3000\u3000\u793a\u4f8b\u4ee3\u7801\u5982\u4e0b\uff1a\u3000\u3000JSP\u4ee3\u7801\uff1a Demo \u3000\u3000Servlet\u4ee3\u7801\uff1a
public class DemoServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String name = request.getParameter("name");//\u83b7\u53d6jsp\u9875\u9762\u8f93\u5165\u7684\u53c2\u6570 System.out.println(name); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request, response); }}\u3000\u3000\u8868\u5355\u63d0\u4ea4\u4e4b\u540e\uff0c\u8c03\u7528Servlet\u7c7b\u7684\u65b9\u6cd5\uff0c\u901a\u8fc7request\u5bf9\u8c61\u83b7\u53d6jsp\u9875\u9762\u4f20\u5165\u7684\u53c2\u6570\u503c\uff0c\u5b9e\u73b0\u6570\u636e\u7684\u4f20\u9012\u3002
在test.jsp页面使用<jsp:useBean>标签调用javabean
在test.jsp里使用get()方法就可以得到数据了
//下面是test.jsp
<%@ page contentType="text/html;charset=GB2312"%>
<jsp:useBean id="test" class="test.Testjavajsp" scope="session"/>
<%
out.println("用户名："+test.getUsername());
%>
//下面是Testjavajsp类
package test;
import java.sql.*;
public class Testjavajsp {
String username="";
Connection conn=null;
Statement stmt=null;
ResultSet rs=null;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public Testjavajsp()
{
String sql="select * from userinfo where userID=1";
String driver="com.mysql.jdbc.Driver";
String url="jdbc:mysql://localhost:3306/qquser";
try {
Class.forName(driver);
conn=DriverManager.getConnection(url,"root","123456");
stmt=conn.createStatement();
rs=stmt.executeQuery(sql);
while(rs.next())
{
username=rs.getString(1);
}
rs.close();
}catch(Exception e){
System.out.println("连接失败");
}
}
}
希望对你有帮助
其实还有很多种方法可以
你将员工的信息封装成一个类，然后将查询后的所有值通过set（）方法给对象属性赋值，再将员工对象添加到list里，返回一个list集合，在你的servlet里面用list接，再用req.setAttribute();将list集合传到session中，在jsp页面用c标签遍历输出<c:for Each var="a" items="${list}">
${a.yuangongname} <!--就可以得到员工姓名，其它信息依此输出就是了-->
</c:for Each>
java向jsp传值的方法大致分为以下几类：
1、用<input>输入域获取参数，提交表单
2、request.setAttribute();在下个页面直接request.getAttribute()得到；
3、<jsp:forward="你要跳转到得页面">
<jsp:param>你要传递的参数
4、用seesion传递
5.url传递：url?a=""&b="";
request.setattirbute(rs);
页面，request。getattirbute（rs）；
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绛旓細request.setAttribute("parName",value);session.setAttribute("parName",value);
