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| package com.xiaoguan.request;
import com.alibaba.fastjson.JSON;
import com.xiaoguan.bean.Information;
import jakarta.servlet.ServletException;
import jakarta.servlet.annotation.WebServlet;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.*;
import java.util.ArrayList;
import java.util.List;
@WebServlet("/ajax5")
public class ajax5Servlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.setContentType("text/html;charset=UTF-8");
PrintWriter out = resp.getWriter();
String jsonstr="";
Connection conn=null;
PreparedStatement ps=null;
ResultSet rs=null;
try {
Class.forName("com.mysql.cj.jdbc.Driver");
conn= DriverManager.getConnection("jdbc:mysql://localhost:3306/xiaoguan","root","68963120g");
String sql="select 登录名,登录密码,真实姓名 from login ";
ps=conn.prepareStatement(sql);
rs=ps.executeQuery();
List<Information> infoList=new ArrayList<>();
while (rs.next()) {
String 登录名 = rs.getString("登录名");
String 登录密码 = rs.getString("登录密码");
String 真实姓名 = rs.getString("真实姓名");
Information info=new Information(登录名,登录密码,真实姓名);
infoList.add(info);
}
jsonstr = JSON.toJSONString(infoList);
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
throw new RuntimeException(e);
} finally {
if (rs!=null) {
try {
rs.close();
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
if (ps!=null) {
try {
ps.close();
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
if (rs!=null) {
try {
rs.close();
} catch (SQLException e) {
throw new RuntimeException(e);
}
}
}
out.print(jsonstr);
}
}
|