javaWeb学生信息查询
2024-05-09 08:30:55
学生成绩查询系统
- 欢迎浏览
- 项目目录
- com.zz.action
- com.zz.action.student
- com.zz.action.test
- com.zz.controller
- com.zz.dao
- com.zz.pojo
- com.zz.util
- src
- db
- lib
- WEB-INF
- WebContent
- 效果图
欢迎浏览
你好！这一篇文章是为了巩固对前面知识，完成的练习。需要使用的知识：jsp,mysql,java
工具：c3p0数据库连接器。
项目目录
com.zz.action
package com.zz.action;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;public interface Action {public void execute(HttpServletRequest request,HttpServletResponse response);
}com.zz.action.student
QueryStudentInfoAction.java
package com.zz.action.student;import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import com.zz.action.Action;
import com.zz.dao.ScoreDao;
import com.zz.dao.StudentDao;
import com.zz.pojo.Score;
import com.zz.pojo.Student;public class QueryStudentInfoAction implements Action {private StudentDao studentDao;private ScoreDao scoreDao;public QueryStudentInfoAction() {studentDao = new StudentDao();scoreDao = new ScoreDao();}@Overridepublic void execute(HttpServletRequest request, HttpServletResponse response) {//下拉班级ArrayList<Student> slist = studentDao.getKindOfClassname();request.setAttribute("slist", slist);if(!request.getParameter("subject").equals("")&&request.getParameter("name").equals("")&&request.getParameter("classname").equals("所有班级")) {//按科目查找String subject = request.getParameter("subject");ArrayList<Score> list = scoreDao.getInfoBySub(subject);HashMap<Integer,Student> map = new HashMap<Integer,Student>();for (Score score: list) {int sid = score.getSid();Student student = studentDao.getStudentById(sid);map.put(sid, student);}request.setAttribute("list", list);request.setAttribute("map", map);try {request.getRequestDispatcher("/studentInfo.jsp").forward(request, response);return;} catch (ServletException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}else if(request.getParameter("subject").equals("")&&!request.getParameter("name").equals("")&&request.getParameter("classname").equals("所有班级")) {//按姓名查找String name = request.getParameter("name");int sid = studentDao.getIdByName(name);ArrayList<Score> list = scoreDao.getScoreBySid(sid);HashMap<Integer,Student> map = new HashMap<Integer,Student>();for (Score score: list) {int sdid = score.getSid();Student student = studentDao.getStudentById(sdid);map.put(sdid, student);}request.setAttribute("list", list);request.setAttribute("map", map);try {request.getRequestDispatcher("/studentInfo.jsp").forward(request, response);return;} catch (ServletException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}else if(request.getParameter("subject").equals("")&&request.getParameter("name").equals("")&&!request.getParameter("classname").equals("")) {//按班级查找String classname = request.getParameter("classname");if(classname.equals("所有班级")) {//查全部信息try {request.getRequestDispatcher("student-info.action").forward(request, response);return;} catch (ServletException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}else {ArrayList<Student> list = studentDao.getInfoByCname(classname);int size = list.size()-1;ArrayList<Score> scoreList = new ArrayList<Score>();int a = 0;for(a=0;a<=size;a++) {int b = list.get(a).getId();scoreList.addAll(scoreDao.getScoreBySid(b));}HashMap<Integer,Student> map = new HashMap<Integer,Student>();for (Score score: scoreList) {int sdid = score.getSid();Student student = studentDao.getStudentById(sdid);map.put(sdid, student);}request.setAttribute("list", scoreList);request.setAttribute("map", map);try {request.getRequestDispatcher("/studentInfo.jsp").forward(request, response);return;} catch (ServletException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}else if(!request.getParameter("subject").equals("")&&!request.getParameter("name").equals("")&&!request.getParameter("classname").equals("")) {//多条件查找if(request.getParameter("classname").equals("所有班级")) {String subject = request.getParameter("subject");String name = request.getParameter("name");int sid = studentDao.getIdByName(name);ArrayList<Score> list = scoreDao.getOnSidSubject(sid, subject);HashMap<Integer,Student> map = new HashMap<Integer,Student>();for (Score score: list) {int id = score.getSid();Student student = studentDao.getStudentById(id);map.put(id, student);}request.setAttribute("list", list);request.setAttribute("map", map);try {request.getRequestDispatcher("/studentInfo.jsp").forward(request, response);return;} catch (ServletException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}else{String subject = request.getParameter("subject");String name = request.getParameter("name");String classname = request.getParameter("classname");int sid = studentDao.getIdOnNameCName(name, classname);ArrayList<Score> list = scoreDao.getOnSidSubject(sid, subject);HashMap<Integer,Student> map = new HashMap<Integer,Student>();for (Score score: list) {int id = score.getSid();Student student = studentDao.getStudentById(id);map.put(id, student);}request.setAttribute("list", list);request.setAttribute("map", map);try {request.getRequestDispatcher("/studentInfo.jsp").forward(request, response);return;} catch (ServletException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}}}StudentInfoAction.java
package com.zz.action.student;import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import com.zz.action.Action;
import com.zz.dao.ScoreDao;
import com.zz.dao.StudentDao;
import com.zz.pojo.Score;
import com.zz.pojo.Student;public class StudentInfoAction implements Action {private StudentDao studentDao;private ScoreDao scoreDao;public StudentInfoAction() {studentDao = new StudentDao();scoreDao = new ScoreDao();}@Overridepublic void execute(HttpServletRequest request, HttpServletResponse response) {//下拉班级ArrayList<Student> slist = studentDao.getKindOfClassname();request.setAttribute("slist", slist);//信息展示ArrayList<Score> list = scoreDao.getScore();HashMap<Integer,Student> map = new HashMap<Integer,Student>();for (Score score: list) {int sid = score.getSid();Student student = studentDao.getStudentById(sid);map.put(sid, student);}request.setAttribute("list", list);request.setAttribute("map", map);try {request.getRequestDispatcher("/studentInfo.jsp").forward(request, response);} catch (ServletException e) {// TODO Auto-generated catch blocke.printStackTrace();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}}com.zz.action.test
Test.java
package com.zz.action.test;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import com.zz.action.Action;public class Test implements Action{public Test() {}@Overridepublic void execute(HttpServletRequest request, HttpServletResponse response) { }
}com.zz.controller
package com.zz.controller;import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Properties;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import com.zz.action.Action;public class ActionServlet extends HttpServlet {private static final long serialVersionUID = 1L;private Properties properties;public void init() {String file=Thread.currentThread().getContextClassLoader().getResource("config.properties").getFile();properties=new Properties();try {properties.load(new FileInputStream(file));} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doPost(request, response);}protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {request.setCharacterEncoding("UTF-8");response.setCharacterEncoding("UTF-8");response.setContentType("text/html; charset=UTF-8");String struri=request.getRequestURI();struri=struri.substring(struri.lastIndexOf("/")+1);String className=properties.getProperty(struri);try {Action action = (Action) Class.forName(className).newInstance();action.execute(request,response);} catch (Exception e) {e.printStackTrace();}}}
com.zz.dao
ScoreDao.java
package com.zz.dao;import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;import com.zz.pojo.Score;
import com.zz.util.C3P0Utils;public class ScoreDao {public ArrayList<Score> getScore() {ArrayList<Score> list = new ArrayList<Score>();Connection con = null;Statement st = null;ResultSet rs = null;String sql = "select * from tbl_score";try {con = C3P0Utils.getConn();st = con.createStatement();rs = st.executeQuery(sql);while (rs.next()) {Score score = new Score();score.setId(rs.getInt("id"));score.setSubject(rs.getString("subject"));score.setScore(rs.getInt("score"));score.setSid(rs.getInt("sid"));list.add(score);}} catch (Exception e) {e.printStackTrace();} finally {C3P0Utils.closeJDBC(con, st, rs);}return list;}public ArrayList<Score> getOnSidSubject(int sid,String subject) {ArrayList<Score> list = new ArrayList<Score>();Connection conn = C3P0Utils.getConn();PreparedStatement psmt = null;ResultSet rs = null;try { String sql = "select * from tbl_score where subject = ? and sid = ?";psmt = conn.prepareStatement(sql);psmt.setString(1, subject);psmt.setInt(2, sid);// 执行rs = psmt.executeQuery();while (rs.next()) {Score score = new Score();score.setId(rs.getInt("id"));score.setSubject(rs.getString("subject"));score.setScore(rs.getInt("score"));score.setSid(rs.getInt("sid"));list.add(score);} } catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();} finally {C3P0Utils.closeJDBC(conn, psmt, rs);}return list;}public ArrayList<Score> getInfoBySub(String subject) {ArrayList<Score> list = new ArrayList<Score>();Connection conn = C3P0Utils.getConn();PreparedStatement psmt = null;ResultSet rs = null;try { String sql = "select * from tbl_score where subject = ?";psmt = conn.prepareStatement(sql);psmt.setString(1, subject);// 执行rs = psmt.executeQuery();while (rs.next()) {Score score = new Score();score.setId(rs.getInt("id"));score.setSubject(rs.getString("subject"));score.setScore(rs.getInt("score"));score.setSid(rs.getInt("sid"));list.add(score);} } catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();} finally {C3P0Utils.closeJDBC(conn, psmt, rs);}return list;}public Score getScoreById(int id) {Connection con = null;PreparedStatement psmt = null;ResultSet rs = null;Score score = null;String sql = "select * from tbl_score where id=" + id;try {con = C3P0Utils.getConn();psmt = con.prepareStatement(sql);rs = psmt.executeQuery(sql);while (rs.next()) {int mid = rs.getInt("id");String subject = rs.getString("subject");int mscore = rs.getInt("score");int sid = rs.getInt("sid");// 创建 Score对象score = new Score(mid, subject, mscore, sid);}} catch (Exception e) {e.printStackTrace();} finally {C3P0Utils.closeJDBC(con, psmt, rs);}return score;}public ArrayList<Score> getScoreBySid(int sid) {ArrayList<Score> list = new ArrayList<Score>();Connection con = null;PreparedStatement psmt = null;ResultSet rs = null;Score score = null;String sql = "select * from tbl_score where sid = ?";try {con = C3P0Utils.getConn();psmt = con.prepareStatement(sql);psmt.setInt(1, sid);rs = psmt.executeQuery();while (rs.next()) {int mid = rs.getInt("id");String subject = rs.getString("subject");int mscore = rs.getInt("score");int sdid = rs.getInt("sid");// 创建 Score对象score = new Score(mid, subject, mscore, sdid);list.add(score);}} catch (Exception e) {e.printStackTrace();} finally {C3P0Utils.closeJDBC(con, psmt, rs);}return list;}public ArrayList<Score> getInfoByMoreSid(String msql) {ArrayList<Score> list = new ArrayList<Score>();Connection con = null;PreparedStatement psmt = null;ResultSet rs = null;Score score = null;String sql = "select * from tbl_score where ?";try {con = C3P0Utils.getConn();psmt = con.prepareStatement(sql);psmt.setString(1, msql);rs = psmt.executeQuery();while (rs.next()) {int mid = rs.getInt("id");String subject = rs.getString("subject");int mscore = rs.getInt("score");int sdid = rs.getInt("sid");// 创建 Score对象score = new Score(mid, subject, mscore, sdid);list.add(score);}} catch (Exception e) {e.printStackTrace();} finally {C3P0Utils.closeJDBC(con, psmt, rs);}return list;}
}StudentDao.java
package com.zz.dao;import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;import com.zz.pojo.Student;
import com.zz.util.C3P0Utils;public class StudentDao {public ArrayList<Student> getStudent() {ArrayList<Student> list = new ArrayList<Student>();Connection con = null;Statement st = null;ResultSet rs = null;String sql = "select * from tbl_student";try {con = C3P0Utils.getConn();st = con.createStatement();rs = st.executeQuery(sql);while (rs.next()) {Student student = new Student();student.setId(rs.getInt("id"));student.setName(rs.getString("name"));student.setPhone(rs.getString("phone"));student.setClassname(rs.getString("classname"));System.out.println("shfisf");list.add(student);}} catch (Exception e) {e.printStackTrace();} finally {C3P0Utils.closeJDBC(con, st, rs);}return list;}public ArrayList<Student> getKindOfClassname() {ArrayList<Student> list = new ArrayList<Student>();Connection con = null;Statement st = null;ResultSet rs = null;String sql = "select distinct classname from tbl_student";try {con = C3P0Utils.getConn();st = con.createStatement();rs = st.executeQuery(sql);while (rs.next()) {Student student = new Student();student.setClassname(rs.getString("classname"));list.add(student);}} catch (Exception e) {e.printStackTrace();} finally {C3P0Utils.closeJDBC(con, st, rs);}return list;}public ArrayList<Student> getInfoByCname(String classname) {ArrayList<Student> list = new ArrayList<Student>();Connection con = null;PreparedStatement st = null;ResultSet rs = null;String sql = "select * from tbl_student where classname=?";try {con = C3P0Utils.getConn();st = con.prepareStatement(sql);st.setString(1, classname);rs = st.executeQuery();while (rs.next()) {Student student = new Student();student.setId(rs.getInt("id"));student.setName(rs.getString("name"));student.setPhone(rs.getString("phone"));student.setClassname(rs.getString("classname"));list.add(student);}} catch (Exception e) {e.printStackTrace();} finally {C3P0Utils.closeJDBC(con, st, rs);}return list;}public ArrayList<Student> getInfoByName(String name) {ArrayList<Student> list = new ArrayList<Student>();Connection conn = C3P0Utils.getConn();PreparedStatement psmt = null;ResultSet rs = null;String sql = "select * from tbl_student where name=?";try {conn = C3P0Utils.getConn();psmt = conn.prepareStatement(sql);psmt.setString(1, name);rs = psmt.executeQuery();while (rs.next()) {Student student = new Student();student.setId(rs.getInt("id"));student.setName(rs.getString("name"));student.setPhone(rs.getString("phone"));student.setClassname(rs.getString("classname"));list.add(student);}} catch (Exception e) {e.printStackTrace();} finally {C3P0Utils.closeJDBC(conn, psmt, rs);}return list;}public int getIdByName(String name) {Connection conn = C3P0Utils.getConn();PreparedStatement psmt = null;ResultSet rs = null;int sid = 0;String sql = "select * from tbl_student where name=?";try {conn = C3P0Utils.getConn();psmt = conn.prepareStatement(sql);psmt.setString(1, name);rs = psmt.executeQuery();while (rs.next()) {sid = rs.getInt("id");return sid;}} catch (Exception e) {e.printStackTrace();} finally {C3P0Utils.closeJDBC(conn, psmt, rs);}return sid;}public int getIdOnNameCName(String name,String classname) {Connection conn = C3P0Utils.getConn();PreparedStatement psmt = null;ResultSet rs = null;int sid = 0;String sql = "select * from tbl_student where name = ? and classname = ?";try {conn = C3P0Utils.getConn();psmt = conn.prepareStatement(sql);psmt.setString(1, name);psmt.setString(2, classname);rs = psmt.executeQuery();while (rs.next()) {sid = rs.getInt("id");return sid;}} catch (Exception e) {e.printStackTrace();} finally {C3P0Utils.closeJDBC(conn, psmt, rs);}return sid;}public Student getStudentById(int id) {Connection con = null;PreparedStatement psmt = null;ResultSet rs = null;Student student = null;String sql = "select * from tbl_student where id=" + id;try {con = C3P0Utils.getConn();psmt = con.prepareStatement(sql);rs = psmt.executeQuery(sql);while (rs.next()) {student = new Student();student.setId(rs.getInt("id"));student.setName(rs.getString("name"));student.setPhone(rs.getString("phone"));student.setClassname(rs.getString("classname"));return student;}} catch (Exception e) {e.printStackTrace();} finally {C3P0Utils.closeJDBC(con, psmt, rs);}return student;}public ArrayList<Student> getInfoListById(int id) {ArrayList<Student> list = new ArrayList<Student>();Connection con = null;PreparedStatement psmt = null;ResultSet rs = null;Student student = null;String sql = "select * from tbl_student where id=" + id;try {con = C3P0Utils.getConn();psmt = con.prepareStatement(sql);rs = psmt.executeQuery(sql);while (rs.next()) {student = new Student();student.setId(rs.getInt("id"));student.setName(rs.getString("name"));student.setPhone(rs.getString("phone"));student.setClassname(rs.getString("classname"));list.add(student);}} catch (Exception e) {e.printStackTrace();} finally {C3P0Utils.closeJDBC(con, psmt, rs);}return list;}
}com.zz.pojo
Score.java
package com.zz.pojo;import java.io.Serializable;public class Score implements Serializable{private static final long serialVersionUID = 1L;private Integer id;private String subject;private Integer score;private Integer sid;public Score() {super();}public Score(String subject, Integer score, Integer sid) {super();this.subject = subject;this.score = score;this.sid = sid;}public Score(Integer id, String subject, Integer score, Integer sid) {super();this.id = id;this.subject = subject;this.score = score;this.sid = sid;}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getSubject() {return subject;}public void setSubject(String subject) {this.subject = subject;}public Integer getScore() {return score;}public void setScore(Integer score) {this.score = score;}public Integer getSid() {return sid;}public void setSid(Integer sid) {this.sid = sid;}@Overridepublic String toString() {return "Score [id=" + id + ", subject=" + subject + ", score=" + score + ", sid=" + sid + "]";}}Student.java
package com.zz.pojo;import java.io.Serializable;public class Student implements Serializable{/*** */private static final long serialVersionUID = 1L;private Integer id;private String name;private String phone;private String classname;public Student() {super();}public Student(String name, String phone, String classname) {super();this.name = name;this.phone = phone;this.classname = classname;}public Student(Integer id, String name, String phone, String classname) {super();this.id = id;this.name = name;this.phone = phone;this.classname = classname;}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getPhone() {return phone;}public void setPhone(String phone) {this.phone = phone;}public String getClassname() {return classname;}public void setClassname(String classname) {this.classname = classname;}@Overridepublic String toString() {return "Student [id=" + id + ", name=" + name + ", phone=" + phone + ", classname=" + classname + "]";}}com.zz.util
C3P0Utils.java
package com.zz.util;import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;import com.mchange.v2.c3p0.ComboPooledDataSource;public class C3P0Utils {static ComboPooledDataSource dataSource = new ComboPooledDataSource("mysql");public static Connection getConn() {try {Connection conn = dataSource.getConnection();return conn;} catch (SQLException e) {// TODO Auto-generated catch blocke.printStackTrace();}return null;}public static void closeJDBC(Connection con,Statement st,ResultSet rs) {if(rs!=null) {try {rs.close();} catch (SQLException e) {e.printStackTrace();}}if(st!=null) {try {st.close();} catch (SQLException e) {e.printStackTrace();}}try {if(con!=null && con.isClosed()==false) {con.close();}} catch (SQLException e) {e.printStackTrace();}}
}
src
c3p0-config.xml
<?xml version="1.0" encoding="UTF-8"?>
<c3p0-config><!--默认配置 --><default-config><property name="initialPoolSize">10</property><property name="maxIdleTime">30</property><property name="maxPoolSize">100</property><property name="minPoolSize">10</property><property name="maxStatements">200</property></default-config><!--配置连接池mysql --><named-config name="mysql"><property name="driverClass">com.mysql.jdbc.Driver</property><property name="jdbcUrl">jdbc:mysql://localhost:3306/test</property><property name="user">root</property><property name="password">123456</property><property name="initialPoolSize">10</property><property name="maxIdleTime">30</property><property name="maxPoolSize">100</property><property name="minPoolSize">10</property><property name="maxStatements">200</property></named-config>
</c3p0-config>
config.properties
#test
show-test.action=com.zz.action.test.Test#info
student-info.action=com.zz.action.student.StudentInfoAction#query
query-bysubject.action=com.zz.action.student.QueryInfoAction#queryB
query-info.action=com.zz.action.student.QueryStudentInfoAction
db
tbl_score.sql
/*
MySQL Data Transfer
Source Host: localhost
Source Database: test
Target Host: localhost
Target Database: test
Date: 2019/10/13 19:38:22
*/SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for tbl_score
-- ----------------------------
DROP TABLE IF EXISTS `tbl_score`;
CREATE TABLE `tbl_score` (`id` int(11) NOT NULL AUTO_INCREMENT,`subject` varchar(20) DEFAULT NULL,`score` int(11) DEFAULT NULL,`sid` int(11) DEFAULT NULL,PRIMARY KEY (`id`),KEY `FK_sid` (`sid`),CONSTRAINT `FK_sid` FOREIGN KEY (`sid`) REFERENCES `tbl_student` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=16 DEFAULT CHARSET=utf8;-- ----------------------------
-- Table structure for tbl_student
-- ----------------------------
DROP TABLE IF EXISTS `tbl_student`;
CREATE TABLE `tbl_student` (`id` int(11) NOT NULL AUTO_INCREMENT,`name` varchar(20) DEFAULT NULL,`phone` varchar(20) DEFAULT NULL,`classname` varchar(20) DEFAULT NULL,PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8;-- ----------------------------
-- Records
-- ----------------------------
INSERT INTO `tbl_score` VALUES ('1', 'Java基础', '80', '1');
INSERT INTO `tbl_score` VALUES ('2', 'Java基础', '60', '2');
INSERT INTO `tbl_score` VALUES ('3', 'Java基础', '90', '3');
INSERT INTO `tbl_score` VALUES ('4', 'Java基础', '70', '4');
INSERT INTO `tbl_score` VALUES ('5', 'Java基础', '80', '5');
INSERT INTO `tbl_score` VALUES ('6', 'Oracle', '80', '1');
INSERT INTO `tbl_score` VALUES ('7', 'Oracle', '90', '2');
INSERT INTO `tbl_score` VALUES ('8', 'Oracle', '70', '3');
INSERT INTO `tbl_score` VALUES ('9', 'Oracle', '80', '4');
INSERT INTO `tbl_score` VALUES ('10', 'Oracle', '76', '5');
INSERT INTO `tbl_score` VALUES ('11', 'Spring', '50', '1');
INSERT INTO `tbl_score` VALUES ('12', 'Spring', '60', '2');
INSERT INTO `tbl_score` VALUES ('13', 'Spring', '60', '3');
INSERT INTO `tbl_score` VALUES ('14', 'Spring', '70', '4');
INSERT INTO `tbl_score` VALUES ('15', 'Spring', '80', '5');
INSERT INTO `tbl_student` VALUES ('1', 'Tom', '123456789', 'STA01');
INSERT INTO `tbl_student` VALUES ('2', 'Mary', '987654321', 'STA01');
INSERT INTO `tbl_student` VALUES ('3', 'Sam', '123456789', 'STA02');
INSERT INTO `tbl_student` VALUES ('4', 'Bill', '123456789', 'STA02');
INSERT INTO `tbl_student` VALUES ('5', 'Mary', '123456789', 'STA02');
lib
c3p0-0.9.1.2.jar
jstl.jar
mysql-connector-java-5.1.6-bin.jar
standard.jar
WEB-INF
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"><display-name>StudentInfo</display-name><welcome-file-list><welcome-file>index.html</welcome-file><welcome-file>index.htm</welcome-file><welcome-file>index.jsp</welcome-file><welcome-file>default.html</welcome-file><welcome-file>default.htm</welcome-file><welcome-file>default.jsp</welcome-file></welcome-file-list><servlet><description></description><display-name>ActionServlet</display-name><servlet-name>ActionServlet</servlet-name><servlet-class>com.zz.controller.ActionServlet</servlet-class></servlet><servlet-mapping><servlet-name>ActionServlet</servlet-name><url-pattern>*.action</url-pattern></servlet-mapping>
</web-app>
WebContent
NewFile.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<a href="student-info.action">点击1</a>
<br/></body>
</html>
studentInfo.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>学生信息展示</title>
<style type="text/css">
body {text-align: center; font-size: 13px;} table {border-collapse: collapse;border:1px solid black;align:center;padding:0px;width:550px;margin: auto;}table, td, th {border: 1px solid black;}
</style>
</head>
<body>
<form action="query-info.action">
<label>科目:</label><input name="subject"/>
<label>姓名:</label><input name="name"/>
<label>班级:</label>
<select id="classname" name="classname" autofocus >
<option value="所有班级">所有班级</option><c:forEach items="${slist }" var="slist"><option value="${slist.classname }">${slist.classname }</option></c:forEach></select>
<button class="submit" type="submit" name="query" value="true" tabindex="80">查询</button>
</form><table><tr><td>编号</td><td>姓名</td><td>班级</td><td>科目</td><td>分数</td></tr><c:forEach items="${ list}" var="list"><tr><td><c:out value="${list.id }"></c:out></td><td>${map[list.sid ].name}</td><td>${map[list.sid ].classname}</td><td><c:out value="${list.subject }"></c:out></td><td><c:out value="${list.score }"></c:out></td></tr></c:forEach></table>
</body>
</html>
效果图
运行NewFile.jsp
查询数据后展示
根据科目查询例如：Oracle
根据姓名查询例如：Tom
根据班级查询例如：STA01
根据科目和姓名查询例如：STA01
还有其他条件组合查询
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