互联学术一、查询学生信息
1. index.jsp
先写一个JSP页面【WebContent/index.jsp】，里面放一个超链接
<a href="StudentListServlet" rel="external nofollow" >显示所有学生列表</a>
2. StudentListServlet.java
写StudentListServlet【com.servlet包下的StudentListServlet.java】，接受请求，去调用service，再由service调用dao
package com.servlet;import java.io.IOException;
import java.sql.SQLException;
import java.util.List;import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import com.domain.Student;
import com.service.StudentService;
import com.service.impl.StudentServiceImpl;/**
*
* 负责查询所有的学生信息，然后呈现到list.jsp页面上
*
*/
@WebServlet("/StudentListServlet")
public class StudentListServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try {
//1.查询出来所有的学生
StudentService service = new StudentServiceImpl();
List<Student> list = service.findAll();
//2.先把数据存储到作用域中
//3..跳转页面
} catch (SQLException e) { e.printStackTrace();
} } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}}
3. StudentDao.java & StudentDaoImpl.java
3.1 StudentDao.java【com.dao包下】
package com.dao;import java.sql.SQLException;
import java.util.List;import com.domain.Student;/**
* 这是针对学生表的数据访问
* @author Administrator
*
*/
public interface StudentDao {
/**
* 查询所有学生
* @returnList<Student>
*/
List<Student> findAll() throws SQLException;
}
3.2 StudentDaoImpl.java【com.dao.impl包下】
实现StudentDao里的findAll()方法。
public class StudentDaoImpl implements StudentDao {
/**
* 查询所有学生
* @throws SQLException
*/
@Override
public List<Student> findAll() throws SQLException {QueryRunner runner = new QueryRunner(JDBCUtil02.getDataSource());
String sql = "select * from stu";
List<Student> list = runner.query(sql, new BeanListHandler<Student>(Student.class));
return list;
}
}
4. StudentService.java 和 StudentService.java
4.1 StudentService.java
代码同StudentDao.java,
public interface StudentService { /**
* 查询所有学生
* @return List<Student>
*
*/
List<Student> findAll() throws SQLException;}
4.2 StudentService.java
public class StudentServiceImpl implements StudentService{ @Override
public List<Student> findAll() throws SQLException {
StudentDao dao = new StudentDaoImpl();
return dao.findAll();
}
}
5. 在StudentListServlet存储数据，并作出页面响应
//2.先把数据存储到作用域中
request.setAttribute("list", list);
//3..跳转页面
request.getRequestDispatcher("list.jsp").forward(request, response);
6. list.jsp
在list.jsp【WebContent/list.jsp】上显示数据。
<%@ 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>学生列表页面 </title>
</head>
<body>
<table border="1" width="700"><tr>
<td colspan="8">
<a href="add.jsp" rel="external nofollow" >添加</a>
</td>
</tr><tr align="center">
<td>编号</td>
<td>姓名</td>
<td>性别</td>
<td>电话</td>
<td>生日</td>
<td>爱好</td>
<td>简介</td>
<td>操作</td>
</tr><c:forEach items="${list }" var="stu">
<tr align="center">
<td>${stu.sid }</td>
<td>${stu.sname }</td>
<td>${stu.gender }</td>
<td>${stu.phone }</td>
<td>${stu.birthday }</td>
<td>${stu.hobby }</td>
<td>${stu.info }</td>
<td><a href="#" rel="external nofollow"rel="external nofollow" >更新</a><a href="#" rel="external nofollow"rel="external nofollow" >删除</a></td>
</tr>
</c:forEach> </table>
</body>
</html>
7. 查找结果如下：
二、添加学生信息
1. add.jsp
我们需要先跳转到增加页面，编写增加页面add.jsp【WebContent/add.jsp】
<body> <h3>添加学生页面</h3> <form action="AddServlet" method="post"> <table border="1" width="600"> <tr> <td>姓名</td> <td><input type="text" name="sname"></td> </tr> <tr> <td>性别</td> <td> <input type="radio" name="gender" value="男">男 <input type="radio" name="gender" value="女">女 </td> </tr> <tr> <td>电话</td> <td><input type="text" name="phone"></td> </tr> <tr> <td>生日</td> <td><input type="text" name="birthday"></td> </tr> <tr> <td>爱好</td> <td> <input type="checkbox" name="hobby" value="游泳">游泳 <input type="checkbox" name="hobby" value="篮球">篮球 <input type="checkbox" name="hobby" value="足球">足球 <input type="checkbox" name="hobby" value="看书">看书 <input type="checkbox" name="hobby" value="写字">写字 </td> </tr> <tr> <td>简介</td> <td> <textarea rows="3" cols="20" name="info"></textarea> </td> </tr> <tr> <td colspan="2"><input type="submit" value="添加"></td> </tr> </table> </form> </body>
实现结果如下：
2. AddServlet.java
点击添加，提交数据到AddServlet，处理数据。
【备：com.servlet包下的AddServlet.java】
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {request.setCharacterEncoding("utf-8");try { //1.获取客户端提交上来的数据
String sname = request.getParameter("sname");
String gender = request.getParameter("gender");
String phone = request.getParameter("phone");
String birthday = request.getParameter("birthday");//传过来是1989-10-18
String info = request.getParameter("info"); //String hobby = request.getParameter("hobby");
String [] h = request.getParameterValues("hobby");
//[篮球，足球，写字]-----篮球，足球，写字
String hobby = Arrays.toString(h);
hobby = hobby.substring(1,hobby.length()-1);
//2.添加到数据库
//String-------Date
Date date = new SimpleDateFormat("yyyy-MM-dd").parse(birthday);
Student student = new Student(sname,gender,phone,hobby,info,date);
StudentService service = new StudentServiceImpl();
service.insert(student);
//3.跳转到列表页
//这里是直接跳转到页面上，那么这个页面会重新翻译一次，上面那个request里面的数据就没有了
//request.getRequestDispatcher("list.jsp").forward(request, response);
//servlet除了能跳jsp之外，还能跳servlet
request.getRequestDispatcher("StudentListServlet").forward(request, response);
} catch (Exception e) {
e.printStackTrace();
}
}
3. StudentDao & StudentService
/** * 添加学生 * @param student需要添加到数据库的学生对象 * @throws SQLException */ void insert(Student student) throws SQLException;
4. Dao & Service的实现
4.1 StudentDaoImpl.java
@Override
public void insert(Student student) throws SQLException {QueryRunner runner = new QueryRunner(JDBCUtil02.getDataSource());
String sql = "insert into stu values(null,?,?,?,?,?,?)";
runner.update(sql,
student.getSname(),
student.getGender(),
student.getPhone(),
student.getBirthday(),
student.getHobby(),
student.getInfo());
}
4.2 StudentServiceImpl.java
@Override
public void insert(Student student) throws SQLException {
StudentDao dao = new StudentDaoImpl();
dao.insert(student); }
5. 注意
完成了上述存储工作之后，需要跳转到列表页面，这里不能直接跳转到列表页面，否则没有什么内容显示。应该先跳转到查询所有学生信息的那个servlet，即StudentListServlet，再由这个servlet跳转到列表页面。
request.getRequestDispatcher("StudentListServlet").forward(request, response);
hobby的value有多个值。处理时需多次转化：
//String hobby = request.getParameter("hobby");
String [] h = request.getParameterValues("hobby");
//[篮球，足球，写字]-----篮球，足球，写字
String hobby = Arrays.toString(h);
hobby = hobby.substring(1,hobby.length()-1);
6. 添加结果如下：
