第1章初始Spring Boot【仿牛客网社区论坛项目】

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第1章初始Spring Boot【仿牛客网社区论坛项目】

前言
推荐
项目总结
- 第1章初识Spring Boot，开发社区首页
- - 1.课程介绍
  - 2.搭建开发环境
  - 3.Spring入门
  - - 体验IOC容器
    - 体验Bean的生命周期
    - 体验配置类
    - 体验依赖注入
    - 体验三层架构
  - 4.SpringMVC入门
  - - 配置
    - 体验响应数据
    - 体验响应Get请求
    - 体验响应Post请求
    - 体验响应HTML数据
    - 体验响应JSON数据
  - 5MyBatis入门
  - - 配置
    - User
    - UserMapper
    - user-mapper.xml
    - 测试:MapperTest
    - 设置日志级别
  - 6开发社区首页
  - - DiscussPost
    - DiscussPostMapper
    - discusspost-mapper.xml
    - 测试Dao层
    - DiscussPostService
    - UserService
    - 前端资源准备
    - HomeController
    - index.html
    - Page
  - 7项目调试技巧
  - - 测试：日志功能
  - 8版本控制
最后

前言

2023-4-30 20:42:51

以下内容源自【Java面试项目】
仅供学习交流使用

项目总结

第1章初识Spring Boot，开发社区首页

在这里插入图片描述

1.课程介绍

2.搭建开发环境

创建项目，完成搭建

添加依赖

aspectj aop包
Spring Web web开发
Thymeleaf 模板引擎
Spring Boot DevTools 开发者工具
其他：使用时添加

配置application.properties

#ServerProperties
#端口配置
server.port=8080
#路径配置
server.servlet.context-path=/community

创建一个AlphaController

编写sayHello()

@Controller
@RequestMapping("/alpha")
public class AlphaController {@RequestMapping("/hello")@ResponseBody//返回字符串public String sayHello(){return "Hello Spring Boot.";}
}

访问：http://localhost:8080/community/alpha/hello

在这里插入图片描述

3.Spring入门

修改测试代码

体验IOC容器

ApplicationContext，管理Bean

package com.jsss.community;@SpringBootTest
@ContextConfiguration(classes = CommunityApplication.class)
class CommunityApplicationTests implements ApplicationContextAware {private ApplicationContext applicationContext;@Overridepublic void setApplicationContext(ApplicationContext applicationContext) throws BeansException {this.applicationContext=applicationContext;}@Testpublic void testApplicationContext(){System.out.println(applicationContext);}
}

创建一个Bean
AlphaDAO

package com.jsss.community.dao;public interface AlphaDao {String select();}

两个实现类

AlphaDaoHibernateImpl

package com.jsss.community.dao;import org.springframework.stereotype.Repository;@Repository("alphaDaoHibernate")//容器管理 指定Bean名字
public class AlphaDaoHibernateImpl implements AlphaDao{@Overridepublic String select() {return "Hibernate";}
}

AlphaDaoMybatisImpl

package com.jsss.community.dao;import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Repository;@Repository
@Primary//优先装配
public class AlphaDaoMybatisImpl implements AlphaDao{@Overridepublic String select() {return "Mybatis";}
}

测试：testApplicationContext()

package com.jsss.community;import com.jsss.community.dao.AlphaDao;
import org.junit.jupiter.api.Test;
import org.springframework.beans.BeansException;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.test.context.ContextConfiguration;@SpringBootTest
@ContextConfiguration(classes = CommunityApplication.class)
class CommunityApplicationTests implements ApplicationContextAware {//SpringBoot会进行自动配置private ApplicationContext applicationContext;//配置方法@Overridepublic void setApplicationContext(ApplicationContext applicationContext) throws BeansException {this.applicationContext=applicationContext;}//测试容器@Testpublic void testApplicationContext(){System.out.println(applicationContext);AlphaDao alphaDao=applicationContext.getBean(AlphaDao.class);System.out.println(alphaDao.select());//MybatisalphaDao= (applicationContext.getBean("alphaDaoHibernate",AlphaDao.class));System.out.println(alphaDao.select());//Hibernate}
}

体验Bean的生命周期

创建AlphaService

package com.jsss.community.service;import org.springframework.stereotype.Service;import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;@Service//容器管理
//作用域 单例 多态
//@Scope("singleton")
//@Scope("prototype")
public class AlphaService {@PostConstruct//IOC容器管理Bean生命周期：初始化public void init(){System.out.println("初始化AlphaService");}@PreDestroy//IOC容器管理Bean生命周期：销毁public void destroy(){System.out.println("销毁AlphaService");}
}

测试：testBean()

    //测试Bean的生命周期//修改Scope作用域@Testpublic void testBean(){AlphaService alphaService=applicationContext.getBean(AlphaService.class);System.out.println(alphaService);alphaService=applicationContext.getBean(AlphaService.class);System.out.println(alphaService);}

体验配置类

添加AlphaConfig

package com.jsss.community.config;import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;import java.text.SimpleDateFormat;@Configuration
public class AlphaConfig {//配置类使用Bean注解添加Bean//方法名就是Bean名字@Beanpublic SimpleDateFormat simpleDateFormat(){return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");}}

测试：getBeanConfig()

    //测试配置类@Testpublic void getBeanConfig(){SimpleDateFormat simpleDateFormat=applicationContext.getBean(SimpleDateFormat.class);System.out.println(simpleDateFormat.format(new Date()));}

体验依赖注入

容器的主动getBean

使用注解@AutoWire

测试：testDI()

    @Autowired@Qualifier("alphaDaoHibernate")//指定Bean名字private AlphaDao alphaDao;@Autowiredprivate AlphaService alphaService;@Autowiredprivate SimpleDateFormat simpleDateFormat;@Testpublic void testDI(){System.out.println(alphaDao);System.out.println(alphaService);System.out.println(simpleDateFormat);}

体验三层架构

Controller–Service–Dao

Service调用Dao

package com.jsss.community.service;import com.jsss.community.dao.AlphaDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;@Service//容器管理
//作用域 单例 多态
//@Scope("singleton")
//@Scope("prototype")
public class AlphaService {@Autowiredprivate AlphaDao alphaDao;@PostConstruct//IOC容器管理Bean生命周期：初始化public void init(){System.out.println("初始化AlphaService");}@PreDestroy//IOC容器管理Bean生命周期：销毁public void destroy(){System.out.println("销毁AlphaService");}public String find(){return alphaDao.select();}}

Controller调用Service

package com.jsss.community.controller;@Controller
@RequestMapping("/alpha")
public class AlphaController {@Autowiredprivate AlphaService alphaService;@RequestMapping("/data")@ResponseBodypublic String getData(){return alphaService.find();}
}

访问：http://localhost:8080/community/alpha/data
在这里插入图片描述

4.SpringMVC入门

配置

# ThymeleafProperties
spring.thymeleaf.cache=false

体验响应数据

AlphaController.http()

	@RequestMapping("/http")public void http(HttpServletRequest request, HttpServletResponse response){//获取请求数据System.out.println(request.getMethod());// GETSystem.out.println(request.getServletPath());// /alpha/httpEnumeration<String> enumeration = request.getHeaderNames();while (enumeration.hasMoreElements()){String name = enumeration.nextElement();String value = request.getHeader(name);System.out.println(name+": "+value);}System.out.println(request.getParameter("code"));//123// 返回响应数据response.setContentType("text/html;charset=utf-8");try (PrintWriter writer = response.getWriter();){writer.write("<h1>牛客网</h1>");} catch (IOException e) {e.printStackTrace();}}

访问：http://localhost:8080/community/alpha/http?code=123

体验响应Get请求

路径拼接
Restful风格

AlphaController.getStudents()

AlphaController.getStudent()

	// GET 请求// /students?current=1&limit=20@RequestMapping(path = "/students",method = RequestMethod.GET)@ResponseBodypublic String getStudents(@RequestParam(name = "current",required = false,defaultValue = "1") int current,@RequestParam(name = "limit",required = false,defaultValue = "10") int limit){System.out.println(current);System.out.println(limit);return "some students";}// /student/123@RequestMapping(path = "/student/{id}",method = RequestMethod.GET)@ResponseBodypublic String getStudent(@PathVariable("id") int id){System.out.println(id);return "a student";}

访问：http://localhost:8080/community/alpha/students?current=1&limit=20

访问：http://localhost:8080/community/alpha/student/123

体验响应Post请求

新增页面：static/html/student.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head><meta charset="UTF-8"><title>增加学生</title>
</head>
<body><form method="post" action="/community/alpha/student"><p>姓名：<input type="text" name="name"></p><p>年龄：<input type="text" name="age"></p><p><input type="submit" value="保存"></p></form>
</body>
</html>

AlphaController.save()

    //  POST请求@RequestMapping(path = "/student",method = RequestMethod.POST)@ResponseBodypublic String save(String name,int age){System.out.println(name);System.out.println(age);return "success";}

访问：http://localhost:8080/community/html/student.html
在这里插入图片描述

体验响应HTML数据

AlphaController.getTeacher()

    //响应HTML数据@RequestMapping(path = "/teacher",method = RequestMethod.GET)public ModelAndView getTeacher(){ModelAndView mav=new ModelAndView();mav.addObject("name","张三");mav.addObject("age",30);mav.setViewName("/demo/view");return mav;}

新增页面：template/demo/view.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head><meta charset="UTF-8"><title>Teacher</title>
</head>
<body><p th:text="${name}"></p><p th:text="${age}"></p>
</body>
</html>

访问：http://localhost:8080/community/alpha/teacher
在这里插入图片描述

AlphaController.getSchool()

    @RequestMapping(path = "/school",method = RequestMethod.GET)public String getSchool(Model model){model.addAttribute("name","北京大学");model.addAttribute("age","80");return "demo/view";}

访问：http://localhost:8080/community/alpha/school

在这里插入图片描述

体验响应JSON数据

AlphaController.getEmp()
AlphaController.getEmps()

	// 响应JSON数据（异步请求）// Java对象 -> JSON字符串 -> JS对象@RequestMapping(path = "/emp",method = RequestMethod.GET)@ResponseBodypublic Map<String,Object> getEmp(){Map<String,Object> emp =new HashMap<>();emp.put("name","张三");emp.put("age",23);emp.put("salary",8000.00);return emp;}@RequestMapping(path = "/emps",method = RequestMethod.GET)@ResponseBodypublic List<Map<String,Object>> getEmps(){List<Map<String,Object>> list=new ArrayList<>();Map<String,Object> emp =new HashMap<>();emp.put("name","张三");emp.put("age",23);emp.put("salary",8000.00);list.add(emp);emp =new HashMap<>();emp.put("name","李四");emp.put("age",24);emp.put("salary",9000.00);list.add(emp);emp =new HashMap<>();emp.put("name","王五");emp.put("age",25);emp.put("salary",10000.00);list.add(emp);return list;}

访问：http://localhost:8080/community/alpha/emp
在这里插入图片描述
访问：http://localhost:8080/community/alpha/emps

5MyBatis入门

配置

添加依赖

        <!--  mysql      --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.22</version></dependency><!--mybatis整合spring--><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>2.0.1</version></dependency>

        <!--lombok--><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.24</version></dependency>

添加配置

# DataSourceProperties
# 驱动
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
# 路径
spring.datasource.url=jdbc:mysql://localhost:3306/community?characterEncoding=utf-8&useSSL=false&serverTimezone=Hongkongspring.datasource.username=root
spring.datasource.password=root
#spring.datasource.type=com.zaxxer.hikari.HikariDataSource
spring.datasource.type=com.mysql.cj.jdbc.MysqlDataSource
spring.datasource.hikari.maximum-pool-size=15
spring.datasource.hikari.minimum-idle=5
spring.datasource.hikari.idle-timeout=30000# MybatisProperties
mybatis.mapper-locations=classpath:mapper/*.xml
mybatis.type-aliases-package=com.jsss.community.entity
#启用自动自增主键
mybatis.configuration.useGeneratedKeys=true
#开启驼峰命名自动匹配
mybatis.configuration.mapUnderscoreToCamelCase=true

User

新建：/entity/User.java

package com.jsss.community.entity;import java.util.Date;import lombok.*;@AllArgsConstructor
@NoArgsConstructor
@Data
public class User {private int id;private String username;private String password;private String salt;private String email;private int type;private int status;private String activationCode;private String headerUrl;private Date createTime;}

UserMapper

新建：/dao/UserMapper.java

package com.jsss.community.dao;import com.jsss.community.entity.User;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;@Mapper
public interface UserMapper {User selectById(int id);User selectByName(String name);User selectByEmail (String email);int insertUser(User user);int updateStatus(@Param("id")int id, @Param("status") int status);int updateHeader(@Param("id")int id, @Param("headerUrl")String headerUrl);int updatePassword(@Param("id")int id, @Param("password")String password);
}

user-mapper.xml

新建：/mapper/user-mapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.jsss.community.dao.UserMapper"><sql id="insertFields">username, password, salt, email, type, status, activation_code, header_url, create_time</sql><sql id="selectFields">id, username, password, salt, email, type, status, activation_code, header_url, create_time</sql><select id="selectById" resultType="User">select <include refid="selectFields"></include>from userwhere id = #{id}</select><select id="selectByName" resultType="User">select <include refid="selectFields"></include>from userwhere username = #{username}</select><select id="selectByEmail" resultType="User">select <include refid="selectFields"></include>from userwhere email = #{email}</select><insert id="insertUser" parameterType="User" keyProperty="id">insert into user (<include refid="insertFields"></include>)values(#{username}, #{password}, #{salt}, #{email}, #{type}, #{status}, #{activationCode}, #{headerUrl}, #{createTime})</insert><update id="updateStatus">update user set status = #{status} where id = #{id}</update><update id="updateHeader">update user set header_url = #{headerUrl} where id = #{id}</update><update id="updatePassword">update user set password = #{password} where id = #{id}</update></mapper>

测试:MapperTest

新建：test:MapperTest.java

package com.jsss.community;import com.jsss.community.dao.UserMapper;import com.jsss.community.entity.User;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.ContextConfiguration;import java.util.Date;@SpringBootTest
@ContextConfiguration(classes = CommunityApplication.class)
public class MapperTest {@Autowiredprivate UserMapper userMapper;@Testpublic void testSelectUser() {User user = userMapper.selectById(101);System.out.println(user);user = userMapper.selectByName("liubei");System.out.println(user);user = userMapper.selectByEmail("nowcoder101@sina.com");System.out.println(user);}@Testpublic void testInsertUser() {User user = new User();user.setUsername("test");user.setPassword("123456");user.setSalt("abc");user.setEmail("test@qq.com");user.setHeaderUrl("http://www.nowcoder.com/101.png");user.setCreateTime(new Date());int rows = userMapper.insertUser(user);System.out.println(rows);System.out.println(user.getId());}@Testpublic void updateUser() {int rows = userMapper.updateStatus(150, 1);System.out.println(rows);rows = userMapper.updateHeader(150, "http://www.nowcoder.com/102.png");System.out.println(rows);rows = userMapper.updatePassword(150, "hello");System.out.println(rows);}}

设置日志级别

# logger
logging.level.com.jsss.community=debug

2023-4-30 23:33:09

6开发社区首页

DiscussPost

新增：entity/DiscussPost.java

package com.jsss.community.entity;import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;import java.util.Date;@Data
@AllArgsConstructor
@NoArgsConstructor
public class DiscussPost {private int id;private int userId;private String title;private String content;private int type;private int status;private Date createTime;private int commentCount;private double score;}

DiscussPostMapper

新增：/dao/DiscussPostMapper.java

package com.jsss.community.dao;import com.jsss.community.entity.DiscussPost;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;import java.util.List;@Mapper
public interface DiscussPostMapper {List<DiscussPost> selectDiscussPosts(int userId,int offset,int limit);// @Param注解用于给参数取别名,// 如果只有一个参数,并且在<if>里使用,则必须加别名.int selectDiscussPostRows(@Param("userId") int userId);}

discusspost-mapper.xml

新增：/mapper/discusspost-mapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapperPUBLIC "-//mybatis.org//DTD Mapper 3.0//EN""http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.jsss.community.dao.DiscussPostMapper"><sql id="selectFields">id, user_id, title, content, type, status, create_time, comment_count, score</sql><sql id="insertFields">user_id, title, content, type, status, create_time, comment_count, score</sql><select id="selectDiscussPosts" resultType="DiscussPost">select <include refid="selectFields"></include>from discuss_postwhere status != 2<if test="userId!=0">and user_id = #{userId}</if>order by type desc, create_time desclimit #{offset}, #{limit}</select><select id="selectDiscussPostRows" resultType="int">select count(id)from discuss_postwhere status != 2<if test="userId!=0">and user_id = #{userId}</if></select></mapper>

测试Dao层

新增：MapperTest.testSelectPosts()

    @Testpublic void testSelectPosts() {List<DiscussPost> list = discussPostMapper.selectDiscussPosts(149, 0, 10);for (DiscussPost post : list) {System.out.println(post);}int rows = discussPostMapper.selectDiscussPostRows(149);System.out.println(rows);}

DiscussPostService

新增：/service/DiscussPostService.java

package com.jsss.community.service;import com.jsss.community.dao.DiscussPostMapper;import com.jsss.community.entity.DiscussPost;
import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import java.util.List;@Service
public class DiscussPostService {@Autowiredprivate DiscussPostMapper discussPostMapper;public List<DiscussPost> findDiscussPosts(int userId, int offset, int limit) {return discussPostMapper.selectDiscussPosts(userId, offset, limit);}public int findDiscussPostRows(int userId) {return discussPostMapper.selectDiscussPostRows(userId);}}

对于帖子：
我们要显示用户名称而不是用户id

有两种解决办法：

关联查询
在高层添加

UserService

新增：/service/UserService.java

package com.jsss.community.service;import com.jsss.community.dao.UserMapper;
import com.jsss.community.entity.User;
import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;@Service
public class UserService{@AutowiredUserMapper userMapper;public User findUserById(int id){return userMapper.selectById(id);}}

前端资源准备

复制静态文件到static下
在这里插入图片描述

复制网页到templates
在这里插入图片描述

顺便把mail复制进来

mail：将来学习发邮件的模板

HomeController

新增：/controller/HomeController()

package com.jsss.community.controller;import com.jsss.community.entity.DiscussPost;
import com.jsss.community.entity.User;
import com.jsss.community.service.DiscussPostService;
import com.jsss.community.service.UserService;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;@Controller
public class HomeController {@Autowiredprivate DiscussPostService discussPostService;@Autowiredprivate UserService userService;@RequestMapping(path = "/", method = RequestMethod.GET)public String root() {return "forward:/index";}@RequestMapping(path = "/index", method = RequestMethod.GET)public String getIndexPage(Model model) {List<DiscussPost> list = discussPostService.findDiscussPosts(0, 0, 10);List<Map<String, Object>> discussPosts = new ArrayList<>();if (list != null) {for (DiscussPost post : list) {Map<String, Object> map = new HashMap<>();map.put("post", post);User user = userService.findUserById(post.getUserId());map.put("user", user);discussPosts.add(map);}}model.addAttribute("discussPosts", discussPosts);return "/index";}}

index.html

修改html标签

<html lang="en" xmlns:th="http://www.thymeleaf.org">

修改静态路径

	<!--前面--><link rel="stylesheet" th:href="@{/css/global.css}" /><!--后面--><script th:src="@{/js/global.js}"></script><script th:src="@{js/index.js}"></script>

主要修改内容main的部分

修改：帖子列表的部分
静态数据改为动态数据

				<!-- 帖子列表 --><ul class="list-unstyled"><li class="media pb-3 pt-3 mb-3 border-bottom" th:each="map:${discussPosts}"><a href="site/profile.html"><img th:src="${map.user.headerUrl}" class="mr-4 rounded-circle" alt="用户头像" style="width:50px;height:50px;"></a><div class="media-body"><h6 class="mt-0 mb-3"><a href="#" th:utext="${map.post.title}">备战春招，面试刷题跟他复习，一个月全搞定！</a><span class="badge badge-secondary bg-primary" th:if="${map.post.type==1}">置顶</span><span class="badge badge-secondary bg-danger" th:if="${map.post.status==1}">精华</span></h6><div class="text-muted font-size-12"><u class="mr-3" th:utext="${map.user.username}">寒江雪</u> 发布于 <b th:text="${#dates.format(map.post.createTime,'yyyy-MM-dd HH:mm:ss')}">2019-04-15 15:32:18</b><ul class="d-inline float-right"><li class="d-inline ml-2">赞 11</li><li class="d-inline ml-2">|</li><li class="d-inline ml-2">回帖 7</li></ul></div></div>						</li></ul>

访问：http://localhost:8080/community/index

Page

分页功能

新增：/entity/Page.java

package com.jsss.community.entity;/*** 封装分页相关的信息.*/
public class Page {// 当前页码private int current = 1;// 显示上限private int limit = 10;// 数据总数(用于计算总页数)private int rows;// 查询路径(用于复用分页链接)private String path;public int getCurrent() {return current;}public void setCurrent(int current) {if (current >= 1) {this.current = current;}}public int getLimit() {return limit;}public void setLimit(int limit) {if (limit >= 1 && limit <= 100) {this.limit = limit;}}public int getRows() {return rows;}public void setRows(int rows) {if (rows >= 0) {this.rows = rows;}}public String getPath() {return path;}public void setPath(String path) {this.path = path;}/*** 获取当前页的起始行** @return*/public int getOffset() {// current * limit - limitreturn (current - 1) * limit;}/*** 获取总页数** @return*/public int getTotal() {// rows / limit [+1]if (rows % limit == 0) {return rows / limit;} else {return rows / limit + 1;}}/*** 获取起始页码** @return*/public int getFrom() {int from = current - 2;return from < 1 ? 1 : from;//低的时候，就按最大页算}/*** 获取结束页码** @return*/public int getTo() {int to = current + 2;int total = getTotal();return to > total ? total : to;//超的时候，就按最大页算}}

修改：HomeController.getIndexPage()

    @RequestMapping(path = "/index", method = RequestMethod.GET)public String getIndexPage(Model model, Page page) {// 方法调用栈,SpringMVC会自动实例化Model和Page,并将Page注入Model.// 所以,在thymeleaf中可以直接访问Page对象中的数据.page.setRows(discussPostService.findDiscussPostRows(0));page.setPath("/index");List<DiscussPost> list = discussPostService.findDiscussPosts(0, page.getOffset(), page.getLimit());List<Map<String, Object>> discussPosts = new ArrayList<>();if (list != null) {for (DiscussPost post : list) {Map<String, Object> map = new HashMap<>();map.put("post", post);User user = userService.findUserById(post.getUserId());map.put("user", user);discussPosts.add(map);}}model.addAttribute("discussPosts", discussPosts);return "/index";}

修改：index.html:分页

				<!-- 分页 --><nav class="mt-5" th:if="${page.rows>0}"><ul class="pagination justify-content-center"><li class="page-item"><a class="page-link" th:href="@{${page.path}(current=1)}">首页</a></li><li th:class="|page-item ${page.current==1?'disabled':''}|"><a class="page-link" th:href="@{${page.path}(current=${page.current-1})}">上一页</a></li><li th:class="|page-item ${i==page.current?'active':''}|" th:each="i:${#numbers.sequence(page.from,page.to)}"><a class="page-link" th:href="@{${page.path}(current=${i})}" th:text="${i}">1</a></li><li th:class="|page-item ${page.current==page.total?'disabled':''}|"><a class="page-link" th:href="@{${page.path}(current=${page.current+1})}">下一页</a></li><li class="page-item"><a class="page-link" th:href="@{${page.path}(current=${page.total})}">末页</a></li></ul></nav></div></div>

访问：http://localhost:8080/community/index?current=1

7项目调试技巧

测试：日志功能

新增：test:LoggerTests.java

package com.jsss.community;import org.junit.jupiter.api.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.ContextConfiguration;@SpringBootTest
@ContextConfiguration(classes = CommunityApplication.class)
public class LoggerTests {private static final Logger logger= LoggerFactory.getLogger(LoggerTests.class);@Testpublic void testLogger(){System.out.println(logger.getName());logger.debug("debug log");logger.info("info log");logger.warn("warn log");logger.error("error log");}
}

配置：

# logger
logging.level.com.jsss.community=debug
logging.file.name=E:/work/data/jsss/community.log

添加：/logback-spring.xml

8版本控制

git的使用

git add .
git commit -m "消息"
git push
git status
git reset HEAD

最后

这篇博客能写好的原因是：站在巨人的肩膀上

这篇博客要写好的目的是：做别人的肩膀

开源：为爱发电

学习：为我而行

这篇关于第1章初始Spring Boot【仿牛客网社区论坛项目】的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！

第1章 初始Spring Boot【仿牛客网社区论坛项目】

第1章 初始Spring Boot【仿牛客网社区论坛项目】

前言

推荐

项目总结

第1章初识Spring Boot，开发社区首页

1.课程介绍

2.搭建开发环境

3.Spring入门

体验IOC容器

体验Bean的生命周期

体验配置类

体验依赖注入

体验三层架构

4.SpringMVC入门

配置

体验响应数据

体验响应Get请求

体验响应Post请求

体验响应HTML数据

体验响应JSON数据

5MyBatis入门

配置

User

UserMapper

user-mapper.xml

测试:MapperTest

设置日志级别

6开发社区首页

DiscussPost

DiscussPostMapper

discusspost-mapper.xml

测试Dao层

DiscussPostService

UserService

前端资源准备

HomeController

index.html

Page

7项目调试技巧

测试：日志功能

8版本控制

最后

相关文章

第1章初始Spring Boot【仿牛客网社区论坛项目】

第1章初始Spring Boot【仿牛客网社区论坛项目】