SpringMVC：SpringMVC+mybatis實現基本操作
阿新 • • 發佈：2018-11-08
SpringMVC第一次課：第一次
對於SpringMVC 有了一個基本的認識。
匯入SpringMVC+mybatis的依賴
spring-webmvc：springmvc核心依賴
<dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>4.3.10.RELEASE</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>4.0.1</version> <scope>provided</scope> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.4.1</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.43</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> <version>1.2</version> <scope>runtime</scope> </dependency> <dependency> <groupId>taglibs</groupId> <artifactId>standard</artifactId> <version>1.1.2</version> </dependency>
匯入C標籤！：jstl、standard，C標籤的基本庫和方法庫
web.xml:
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd" > <web-app> <display-name>Archetype Created Web Application</display-name> <filter> <filter-name>characterEncodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>characterEncodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:springmvc.xml</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>*.action</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>/students.action</welcome-file> </welcome-file-list> </web-app>
配置亂碼過濾器characterEncodingFilter
DispatcherServlet：springmvc入口servlet
welcome-file：首頁
實體類：
具體封裝alt+insert
private int stuId;
private String stuName;
private String stuSex;
private int stuAge;student對映Mapper：實現操作的SQL
cache：二級快取
concat：拼接模糊查詢的SQL
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.hc.dao.StudentDao"> <cache></cache> <select id="likeStudent" resultType="Student"> select * from student <where> <if test="likeStr!=null"> stuName like concat('%',#{likeStr},'%') or stuSex like concat('%',#{likeStr},'%') or stuAge like concat('%',#{likeStr},'%') </if> </where> </select> <select id="selectStudent" resultType="Student" parameterType="int"> select * from student where stuId=#{stuid} </select> <select id="allStudent" resultType="Student"> select * from student </select> <update id="updateStudent" parameterType="Student"> update student <set> <trim suffixOverrides=","> <if test="stuName!=null"> stuName=#{stuName}, </if> <if test="stuSex!=null"> stuSex=#{stuSex}, </if> <if test="stuAge!=null and stuAge!=0"> stuAge=#{stuAge}, </if> </trim> </set> <if test="stuId!=null"> where stuId=#{stuId} </if> </update> <delete id="deleteStudent"> delete from student where stuId=#{stuid} </delete> <sql id="keys"> <trim suffixOverrides=","> <if test="stuName!=null"> stuName, </if> <if test="stuSex!=null"> stuSex, </if> <if test="stuAge!=null and stuAge!=0"> stuAge, </if> </trim> </sql> <sql id="values"> <trim suffixOverrides=","> <if test="stuName!=null"> #{stuName}, </if> <if test="stuSex!=null"> #{stuSex}, </if> <if test="stuAge!=null and stuAge!=0"> #{stuAge}, </if> </trim> </sql> <insert id="insertStudent" parameterType="Student"> insert into student(<include refid="keys"></include>) values(<include refid="values"></include>) </insert> </mapper>
student的mapper會被sqlsession藉助dao的介面呼叫
dao介面：
動態sql的模糊查需要Map
package com.hc.dao;
import com.hc.entity.Student;
import java.util.List;
import java.util.Map;
public interface StudentDao {
public void insertStudent(Student student);
public void deleteStudent(int stuId);
public void updateStudent(Student student);
public Student selectStudent(int stuId);
public List<Student> likeStudent(Map<String,Object> map);
public List<Student> allStudent();
}
dao的實現類
定義factory ，載入mybatis配置，myBatis-config載入具體的物件Mapper
session通過factory 開啟
dao被session例項化
日後的諸如此類的載入物件，將會通過spring工廠產生
package com.hc.dao;
import com.hc.entity.Student;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class StudentImpl {
SqlSessionFactory factory = new SqlSessionFactoryBuilder().build(getClass().getClassLoader().getResourceAsStream("myBatis-config.xml"));
SqlSession session = factory.openSession();
StudentDao studentDao = session.getMapper(StudentDao.class);
public List<Student> allStudent() {
List<Student> studentList=studentDao.allStudent();
session.close();
return studentList;
}
public List<Student> likeStudent(String likeStr) {
// string： if 判斷 需要map 無需指明傳入的參及參的型別
Map<String,Object> map=new HashMap<>();
map.put("likeStr",likeStr);
List<Student> studentList=studentDao.likeStudent(map);
session.close();
return studentList;
}
public Student selectStudent(int stuId) {
Student student= studentDao.selectStudent(stuId);
session.close();
return student;
}
public void insertStudent(Student student) {
studentDao.insertStudent(student);
session.commit();
session.close();
}
public void deleteStudent(int stuId) {
studentDao.deleteStudent(stuId);
session.commit();
session.close();
}
public void updateStudent(Student student) {
studentDao.updateStudent(student);
session.commit();
session.close();
}
}
封裝各個方法，以便 controller 使用
controller:
在類之上，進行controller的註解
方法：RequestMapping ，括號內的是訪問路徑，只有這個訪問路徑被允許呼叫這個方法
package com.hc.controller;
import com.hc.dao.StudentImpl;
import com.hc.entity.Student;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import javax.servlet.http.HttpServletRequest;
import java.util.Map;
@Controller
public class StudentController {
@RequestMapping("/students")
public String allStudent(HttpServletRequest request){
request.setAttribute("students",new StudentImpl().allStudent());
return "success";
}
@RequestMapping("/likeStudent")
public String likeStudent(@RequestParam("likeStr") String likeStr, HttpServletRequest request){
request.setAttribute("students",new StudentImpl().likeStudent(likeStr));
return "success";
}
@RequestMapping("/insertStudent")
public String insertStudent(Student student){
new StudentImpl().insertStudent(student);
return "redirect:students.action";
}
@RequestMapping("/deleteStudent")
public String deleteStudent(int stuId){
new StudentImpl().deleteStudent(stuId);
return "redirect:students.action";
}
@RequestMapping("/updateStudent")
public String updateStudent(Student student){
new StudentImpl().updateStudent(student);
return "redirect:students.action";
}
@RequestMapping("/selectStudent")
public String selectStudent(int stuId, Map map){
map.put("student",new StudentImpl().selectStudent(stuId));
return "first";
}
}
redirect：轉發，一個方法調另一個方法
資料展示頁面：
匯入C標籤
<%--
Created by IntelliJ IDEA.
User: admin
Date: 2018/11/2
Time: 19:57
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" isELIgnored="false" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<a href="/students.action">students</a>
<a href="/insert.jsp">insert</a>
<div align="center">
<form action="/likeStudent.action" method="post">
<input type="text" name="likeStr">
<input type="submit" value="搜尋">
</form>
<table border="1" width="600">
<tr align="center">
<td>編號</td>
<td>姓名</td>
<td>性別</td>
<td>年齡</td>
<td>銷戶</td>
<td>資料</td>
</tr>
<c:forEach items="${students}" var="student">
<tr align="center">
<td>${student.stuId}</td>
<td>${student.stuName}</td>
<td>${student.stuSex}</td>
<td>${student.stuAge}</td>
<td><a href="/deleteStudent.action?stuId=${student.stuId}" onclick="return confirm('是否刪除？')">刪除</a></td>
<td><a href="/selectStudent.action?stuId=${student.stuId}">修改</a></td>
</tr>
</c:forEach>
</table>
</div>
</body>
</html>
C:foreach：可迴圈list，items是傳過來的list，var代表的是一個物件
${ }:EL表示式
注意：EL一定要在最上方宣告： isELIgnored="false"
insert：
普通的表單，輸入框的name一定要與物件的屬性名一致，否則，無法自動收集
<%--
Created by IntelliJ IDEA.
User: admin
Date: 2018/11/2
Time: 17:19
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" isELIgnored="false" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<div align="center">
<form action="/insertStudent.action" method="post">
名字：<input type="text" name="stuName"><br><br>
性別：<input type="text" name="stuSex"><br><br>
年齡：<input type="text" name="stuAge"><br><br>
<input type="submit" value="新增">
</form>
</div>
</body>
</html>
align="center"：居中
update：
<%--
Created by IntelliJ IDEA.
User: admin
Date: 2018/11/2
Time: 17:19
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" isELIgnored="false" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<div align="center">
<form action="/updateStudent.action" method="post">
<input type="hidden" value="${student.stuId}" name="stuId">
名字： <input type="text" value="${student.stuName}" name="stuName"><br><br>
性別： <input type="text" value="${student.stuSex}" name="stuSex"><br><br>
年齡： <input type="text" value="${student.stuAge}" name="stuAge"><br><br>
<input type="submit" value="歐克">
</form>
</div>
</body>
</html>
傳過來的是一個物件，無需C標籤，直接EL表示式即可
Springmvc.xml配置
mybatis-config.xml見上期
初步整合！
if 再加上Spring，就是SSM！