1.使用Mysql建立一張表
- 主要字段包括學院代碼、學院名稱、院長姓名、院長工號等
2.項目結構
3.進行配置Spring boot，連接到Mysql
- 對pom.xml依賴進行導入
- 使用阿里巴巴開源的druid的數據庫連接池進行鏈接
- 將application.properties文件重命名為application.yml
- 在application.yml配置數據庫的信息
server:
port: 8881
servlet:
context-path: /ex02
spring:
datasource:
name: druidDataSource
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.cj.jdbc.Driver
#自己的數據庫Ip地址和數據庫名，賬號及密碼
url: jdbc:mysql://localhost:3306/college?useUnicode=true&characterEncoding=UTF8&serverTimezone=UTC
username: root
password: 99150704
druid:
#監控統計攔截的過濾器 不加監控界面sql無法統計 wall用於防火牆
filters: stat,wall,log4j,config
#最大連接數
max-active: 100
#初始化大小
initial-size: 1
#獲取連接最大等待時間
max-wait: 60000
min-idle: 1
#間隔多久檢測一次需要關閉的空閑連接 毫秒
time-between-eviction-runs-millis: 60000
#連接在連接池中最小生存的時間，毫秒
min-evictable-idle-time-millis: 300000
validation-query: select 'x'
test-while-idle: true
test-on-borrow: false
test-on-return: false
pool-prepared-statements: true
max-open-prepared-statements: 50
max-pool-prepared-statement-per-connection-size: 20
web-stat-filter:
exclusions: "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*"
url-pattern: /*
stat-view-servlet:
#白名單IP
allow: 127.0.0.1
#黑名單IP
deny: 192.168.0.106
#登錄賬號和密碼
login-username: ex02
login-password: springboot
#啟用重置數據功能
reset-enable: true
jpa:
database-platform: org.hibernate.dialect.MySQL5InnoDBDialect
show-sql: true
thymeleaf:
cache: false
suffix: .html
encoding: UTF-8
servlet:
content-type: text/html
mode: HTML5
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>net.sourceforge.nekohtml</groupId>
<artifactId>nekohtml</artifactId>
<version>1.9.22</version>
</dependency>
<!-- 數據庫連接池 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.10</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
- 在resources文件夾下添加log4j.properties的屬性文件，避免報錯，內容如下
log4j.rootLogger=debug, stdout, R
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p - %m%n
log4j.appender.R=org.apache.log4j.RollingFileAppender
log4j.appender.R.File=firestorm.log
log4j.appender.R.MaxFileSize=100KB
log4j.appender.R.MaxBackupIndex=1
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%p %t %c - %m%n
- 啟動項目，訪問druid控制台
- 賬號、密碼為配置文件設置的
4.使用JPA+postman進行增刪改查數據
- 使用idea中的datasource連接mysql數據庫
①新建實體類包，映射的實體類代碼如下：
package com.example.sw_ex02.entity;
import com.fasterxml.jackson.annotation.JsonProperty;
import javax.persistence.*;
import java.util.Objects;
@Entity
@Table(name = "college", schema = "college", catalog = "")
public class CollegeEntity {
private String collegeCode;
private String collegeName;
private String deanName;
private String deanNumber;
@Id
@Column(name = "college_code")
public String getCollegeCode() {
return collegeCode;
}
//springboot解析器在解析json過程中出現問題，因字段名駝峰命名無法匹配字段名導致,進行注解添加
@JsonProperty(value = "college_code")
public void setCollegeCode(String collegeCode) {
this.collegeCode = collegeCode;
}
@Basic
@Column(name = "college_name")
public String getCollegeName() {
return collegeName;
}
@JsonProperty(value = "college_name")
public void setCollegeName(String collegeName) {
this.collegeName = collegeName;
}
@Basic
@Column(name = "dean_name")
public String getDeanName() {
return deanName;
}
@JsonProperty(value = "dean_name")
public void setDeanName(String deanName) {
this.deanName = deanName;
}
@Basic
@Column(name = "dean_number")
public String getDeanNumber() {
return deanNumber;
}
@JsonProperty(value = "dean_number")
public void setDeanNumber(String deanNumber) {
this.deanNumber = deanNumber;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
CollegeEntity that = (CollegeEntity) o;
return Objects.equals(collegeCode, that.collegeCode) &&
Objects.equals(collegeName, that.collegeName) &&
Objects.equals(deanName, that.deanName) &&
Objects.equals(deanNumber, that.deanNumber);
}
@Override
public int hashCode() {
return Objects.hash(collegeCode, collegeName, deanName, deanNumber);
}
}
②新建Repository包，創建CollegeRepository接口
package com.example.sw_ex02.repository;
import com.example.sw_ex02.entity.CollegeEntity;
import org.springframework.data.jpa.repository.JpaRepository;
public interface CollegeRepository extends JpaRepository<CollegeEntity,String> {
}
③編寫CollegeService層方法，實現增刪改查的業務邏輯實現
package com.example.sw_ex02.service;
import com.example.sw_ex02.entity.CollegeEntity;
import com.example.sw_ex02.repository.CollegeRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class CollegeServiceImpl {
@Autowired
private CollegeRepository collegeRepository;
/***
* @description 查詢所有用戶
*/
public List<CollegeEntity> getCollegeList(){
return collegeRepository.findAll();
}
/***
* @description 查詢單個用戶
*/
public CollegeEntity getCollege(String code){
return collegeRepository.findById(code).get();
}
/***
* @description 創建用戶
*/
public CollegeEntity insertCollege(CollegeEntity collegeEntity){
collegeEntity.setCollegeCode("");
collegeEntity.setCollegeName("");
collegeEntity.setDeanName("");
collegeEntity.setDeanNumber("");
return collegeRepository.save(collegeEntity);
}
/***
* @description 修改用戶
*/
public CollegeEntity updateCollege(CollegeEntity collegeEntity){
CollegeEntity collegeEntity1=collegeRepository.findById(collegeEntity.getCollegeCode()).get();
if(collegeEntity1==null){
return null;
}
collegeEntity1.setCollegeName(collegeEntity.getCollegeName());
collegeEntity1.setDeanNumber(collegeEntity.getDeanNumber());
collegeEntity1.setDeanName(collegeEntity.getDeanName());
return collegeRepository.save(collegeEntity1);
}
/***
* @description 刪除用戶
*/
public boolean deleteCollege(String code){
try {
collegeRepository.deleteById(code);
}catch (Exception e){
e.printStackTrace();
return false;
}
return true;
}
}
④編寫CollegeController,實現數據的增刪改查
package com.example.sw_ex02.controller;
import com.example.sw_ex02.entity.CollegeEntity;
import com.example.sw_ex02.service.CollegeServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.List;
@RestController
@RequestMapping("college")
public class CollegeController {
@Autowired
private CollegeServiceImpl collegeService;
/***
* @description 查詢所有用戶
*/
@GetMapping
public List<CollegeEntity> getAllCollege(){
return collegeService.getCollegeList();
}
/***
* @description 查詢單個用戶
*/
@GetMapping("{code}")
public CollegeEntity getCollege(@PathVariable("code")String code){
return collegeService.getCollege(code);
}
/***
* @description 創建用戶
*/
@PostMapping
public CollegeEntity insertCollege(@RequestBody CollegeEntity collegeEntity){
return collegeService.insertCollege(collegeEntity);
}
/***
* @description 修改用戶
*/
@PatchMapping
public CollegeEntity updateCollege(@RequestBody CollegeEntity collegeEntity){
return collegeService.updateCollege(collegeEntity);
}
/***
* @description 刪除用戶
*/
@DeleteMapping("{code}")
public boolean deleteCollege(@PathVariable("code")String code){
collegeService.deleteCollege(code);
return true;
}
}
⑤啟動驗證
- 在啟動類上面添加JPA注解，啟動項目
- 顯示數據庫的內容，並可以依據url后綴的不同進行數據查詢
- 使用postman接口測試工具調用api接口對數據進行刪除、添加、修改
- 查：
- 增：注意數據的傳送格式
- 修改：注意數據的傳送格式
- 刪除：
⑥問題小結
- spring boot對Json數據的轉換存在問題，會將返回的數據轉換成null，在實體類中添加注解即可解決
4.使用模板引擎進行數據的增刪改查
①使用idea連接數據庫，進行映射創建實體類
②編寫增刪改查的業務邏輯代碼
③在目錄/resources下創建文件夾tempates，添加html文件，list頁面、toAdd頁面、toEdit頁面，進行網頁的增刪改查
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8"/>
<title>userList</title>
<!--thymeleaf表達式，th:href="@{/css/bootstrap.css}"@表示后面的是一個鏈接-->
<link rel="stylesheet" th:href="@{/css/bootstrap.css}"/>
</head>
<body class="container">
<br/>
<h1>用戶列表</h1>
<br/><br/>
<div class="with:80%">
<table class="table table-hover">
<thead>
<tr>
<th>#</th>
<th>college_code</th>
<th>college_name</th>
<th>dean_name</th>
<th>dean_number</th>
<th>Edit</th>
<th>Delete</th>
</tr>
</thead>
<tbody>
<!--each來進行for循環求值-->
<tr th:each="collegeEntity : ${collegeEntites}">
<th scope="row" th:text="${collegeEntity.collegeCode}">1</th>
<td th:text="${collegeEntity.collegeCode}">neo</td>
<td th:text="${collegeEntity.collegeName}">neo</td>
<td th:text="${collegeEntity.deanName}">Otto</td>
<td th:text="${collegeEntity.deanNumber}">6</td>
<td><a th:href="'/ex02/toEdit/'+${collegeEntity.collegeCode}">edit</a></td>
<td><a th:href="'/ex02/delete/'+${collegeEntity.collegeCode}">delete</a></td>
</tr>
</tbody>
</table>
</div>
<div class="form-group">
<div class="col-sm-2 control-label">
<a href="/toAdd" th:href="@{/toAdd}" class="btn btn-info">add</a>
</div>
</div>
</body>
</html>
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8"/>
<title>college</title>
<!--利用thymeleaf表達式獲取css路徑,bootstrap給button提供樣式-->
<link rel="stylesheet" th:href="@{/css/bootstrap.css}"/>
</head>
<body class="container">
<br/>
<h1>增加數據</h1>
<br/><br/>
<div class="with:80%">
<form class="form-horizontal" th:action="@{/edit}" method="post">
<div class="form-group">
<label for="collegeCode" class="col-sm-2 control-label">collegeCode</label>
<div class="col-sm-10">
<input type="text" class="form-control" name="collegeCode" id="collegeCode" placeholder="collegeCode"/>
</div>
</div>
<div class="form-group">
<label for="collegeName" class="col-sm-2 control-label" >collegeName</label>
<div class="col-sm-10">
<input type="text" class="form-control" name="collegeName" id="collegeName" placeholder="collegeName"/>
</div>
</div>
<div class="form-group">
<label for="deanName" class="col-sm-2 control-label">deanName</label>
<div class="col-sm-10">
<input type="text" class="form-control" name="deanName" id="deanName" placeholder="deanName"/>
</div>
</div>
<div class="form-group">
<label for="deanNumber" class="col-sm-2 control-label">deanNumber</label>
<div class="col-sm-10">
<input type="text" class="form-control" name="deanNumber" id="deanNumber" placeholder="deanNumber"/>
</div>
</div>
<div class="form-group">
<div class="col-sm-offset-2 col-sm-10">
<input type="submit" value="Submit" class="btn btn-info" />
<input type="reset" value="Reset" class="btn btn-info" />
</div>
</div>
</form>
</div>
</body>
</html>
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8"/>
<title>college</title>
<link rel="stylesheet" th:href="@{/css/bootstrap.css}"/>
</head>
<body class="container">
<br/>
<h1>修改用戶</h1>
<br/><br/>
<div class="with:80%">
<form class="form-horizontal" th:action="@{/edit}" th:object="${college}" method="post">
<input type="hidden" name="collegeCode" th:value="*{collegeCode}" />
<div class="form-group">
<label for="collegeName" class="col-sm-2 control-label" >collegeName</label>
<div class="col-sm-10">
<input type="text" class="form-control" name="collegeName" id="collegeName" th:value="*{collegeName}" placeholder="collegeName"/>
</div>
</div>
<div class="form-group">
<label for="deanName" class="col-sm-2 control-label">deanName</label>
<div class="col-sm-10">
<input type="text" class="form-control" name="deanName" id="deanName" th:value="*{deanName}" placeholder="deanName"/>
</div>
</div>
<div class="form-group">
<label for="deanNumber" class="col-sm-2 control-label">deanNumber</label>
<div class="col-sm-10">
<input type="text" class="form-control" name="deanNumber" id="deanNumber" th:value="*{deanNumber}" placeholder="deanNumber"/>
</div>
</div>
<div class="form-group">
<div class="col-sm-offset-2 col-sm-10">
<input type="submit" value="Submit" class="btn btn-info" />
<a href="/list" th:href="@{/list}" class="btn btn-info">Back</a>
</div>
</div>
</form>
</div>
</body>
</html>
④編寫CollegeController,實現數據的增刪改查
package com.example.sw_ex02.controller;
import com.example.sw_ex02.entity.CollegeEntity;
import com.example.sw_ex02.service.CollegeServiceImpl;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
import javax.annotation.Resource;
import java.util.List;
@Controller
public class CollegeControllerThymeleaf {
@Resource
CollegeServiceImpl collegeService;
/***
* @description 將"/"自動重定向到"/list"
* @return 跳轉到‘/list’頁面
*/
@RequestMapping("/thymeleaf")
public String index(){
return "redirect:/list";
}
/***
* @description 將"/"自動重定向到"/list"
* @return 跳轉到‘/list’頁面
*/
@RequestMapping("/list")
public String list(Model model){
List<CollegeEntity> collegeEntities=collegeService.getCollegeList();
model.addAttribute("collegeEntites",collegeEntities);
return "college/list";
}
/*
* @Discription:跳轉到增加用戶頁面
*/
@RequestMapping(value = "/toAdd")
public String toAdd(){
return "college/collegeAdd";
}
/*
* @param "/add"鏈接
* @return 重定向到/list頁面
* @Discription: 保存實體到數據庫，然后返回到list界面
*/
@RequestMapping(value = "/add")
public String add(CollegeEntity collegeEntity){
collegeService.save(collegeEntity);
return "redirect:/list";
}
/*
* @param /toEdit鏈接進入該程序
* @return 查詢出數據以后，跳轉到編輯界面
* @Discription:跳轉到編輯頁面對數據進行編輯
*/
@RequestMapping(value="/toEdit/{code}")
public String toEdit(Model model,@PathVariable("code")String code) {
CollegeEntity collegeEntity = collegeService.findCollegeById(code);
model.addAttribute("college", collegeEntity);
return "college/collegeEdit";
}
/*
* @param "/edit"鏈接進入該程序
* @return 重定向到"/list"鏈接
* @Discription:更新數據庫中的數據以后跳轉到list
*/
@RequestMapping(value = "/edit")
public String edit(CollegeEntity collegeEntity){
collegeService.edit(collegeEntity);
return "redirect:/list";
}
/*
* @param "/delete"鏈接進入該方法
* @return 重定向到"/list"
* @Discription: 刪除某一個數據后定向到"/list"
*/
@RequestMapping(value="/delete/{code}")
public String delete(@PathVariable("code")String code){
collegeService.delete(code);
return "redirect:/list";
}
}
⑤啟動驗證
- 在瀏覽器輸入相應url，頁面顯示數據庫中表的數據，在網頁上對表進行增刪改查
⑥問題小結
- 在進行模板引擎進行增刪改查的時候，要注意鏈接的正確
- 注意GET與POST請求的區別
- GET - 從指定的資源請求數據
- POST - 向指定的資源提交要被處理的數據
- 了解@RequestMapping注解
- 設置請求地址
- 設置請求的類型，依據請求類型的不同，函數進行不同的操作
5.mybatis-數據庫查詢
①進行mybatis的配置
<!-- mybatis 集成 -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.0.1</version>
</dependency>
<!-- mybatis自動生成插件 -->
<dependency>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-core</artifactId>
<version>1.3.5</version>
</dependency>
<!-- mybatis自動分頁插件 -->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper-spring-boot-starter</artifactId>
<version>1.2.10</version>
</dependency>
#mybatis
mybatis:
type-aliases-package: com.example.sw_ex02.entity
mapper-locations: com.example.sw_ex02.Mapper/*.xml
configuration:
map-underscore-to-camel-case: true
#配置控制台打印日志Debug，用來查看sql寫沒寫錯
logging:
level:
com.jd.mapper: debug
②依據前面所述導入實體類
③在com.example.xxx下創建Mapper文件夾
package com.example.sw_ex02.Mapper;
import com.example.sw_ex02.entity.CollegeEntity;
import org.apache.ibatis.annotations.Mapper;
import java.util.List;
@Mapper
public interface CollegeMapper {
List<CollegeEntity> getAllCollege();
}
- 創建xxxx(與接口文件名字相同).xml文件，在該文件中，使用SQL語句進行對接口文件中的函數進行相應的實現
<?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.example.sw_ex02.Mapper.CollegeMapper">
<select id="getAllCollege" resultType="com.example.demo.entity.CollegeEntity">
select * from college;
</select>
</mapper>
④在service文件夾下創建相關的邏輯業務實現
package com.example.sw_ex02.service;
import com.example.sw_ex02.Mapper.CollegeMapper;
import com.example.sw_ex02.entity.CollegeEntity;
import com.example.sw_ex02.repository.CollegeRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class CollegeServiceImpl {
@Autowired(required = false)
private CollegeMapper collegeMapper;
//mybatis-查詢數據
public List<CollegeEntity> ListCollege(){
return collegeMapper.getAllCollege();
}
}
⑤在conrtoller下創建文件，實現xxxxController，進行數據的操作
package com.example.sw_ex02.controller;
import com.example.sw_ex02.service.CollegeServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
@RestController
@RequestMapping("/mybatis")
public class CollegeControllerMybatis {
@Autowired
private CollegeServiceImpl collegeService;
@RequestMapping("/all")
public String getAllCollege(){
return collegeService.ListCollege().toString();
}
}
⑧啟動驗證，輸入url進行驗證
6.小結
