Springboot初入门

Springboot

Springboot是一个快速开发框架，可以迅速搭建出一套基于Spring框架体系的应用，是SpringCloud的基础。 Springboot开启了各种自动装配，简化代码开发，不需要编写各种配置文件，只需要引入相关的依赖，就可迅速搭建一个应用。

特点 1、不需要web.xml 2、不需要springmvc.xml 3、内嵌tomcat 4、不需要配置JSON解析，支持REST架构 5、个性化配置简单

如何使用 1、创建maven工程，导入相关依赖。

<parent> <artifactId>spring-boot-starter-parent</artifactId> <groupId>org.springframework.boot</groupId> <version>2.3.1.RELEASE</version> </parent> <dependencies> <!-- web启动jar包--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- lombok依赖 若爆红请更新maven--> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.6</version> <scope>provided</scope> </dependency> </dependencies>

如果导入依赖maven出现红线，请点一下更新maven。

2、创建Student实体类

package com.southwind.entity; import lombok.Data; @Data public class Student { private long id; private String name; private int age; }

3、StudentRepository

-------------------接口------------------------- package com.southwind.repository; import com.southwind.entity.Student; import java.util.Collection; import java.util.List; public interface StudentRepository { public Collection<Student> findAll(); public Student findById(long id); public void saveOrUpdate(Student student); public void deleteById(long id); }

4、StudentRepositoryImpl

-----------------------------------实现接口的类 package com.southwind.repository.impl; import com.southwind.entity.Student; import com.southwind.repository.StudentRepository; import org.springframework.stereotype.Repository; import java.util.Collection; import java.util.HashMap; import java.util.List; import java.util.Map; @Repository public class StudentRepositoryImpl implements StudentRepository { private static Map<Long,Student> studentMap; static { studentMap = new HashMap<>(); studentMap.put(1L,new Student(1L,"张三",21)); studentMap.put(2L,new Student(2L,"李四",22)); studentMap.put(3L,new Student(3L,"王五",22)); } @Override public Collection<Student> findAll() { return studentMap.values(); } @Override public Student findById(long id) { return studentMap.get(id); } @Override public void saveOrUpdate(Student student) { studentMap.put(student.getId(),student); } @Override public void deleteById(long id) { studentMap.remove(id); } }

5、StudentHandller

package com.southwind.controller; import com.southwind.entity.Student; import com.southwind.repository.StudentRepository; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.*; import java.util.Collection; @RestController @RequestMapping("/student")//映射请求 public class StudentHandler { @Autowired private StudentRepository studentRepository; @GetMapping("/findAll") public Collection<Student> findAll(){ return studentRepository.findAll(); } @GetMapping("/findById/{id}") public Student findById(@PathVariable("id") long id){ return studentRepository.findById(id); } @PostMapping("/save") public void save(@RequestBody Student student){ studentRepository.saveOrUpdate(student); } @PutMapping("/update") public void update(@RequestBody Student student){ studentRepository.saveOrUpdate(student); } @DeleteMapping("/deleteById/{id}") public void deleteById(@PathVariable("id") long id){ studentRepository.deleteById(id); } }

6、application.yml 配置文件(放在resource内)

server: port: 9090

7、Application启动类 @SpringbootApplication表示当前类是Springboot的入口，Application类的存放位置必须是其他相关业务类存放位置的父级（级别要高）

Spring Boot 整合 JSP

新建空maven工程

pom.xml 添加依赖 <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.7.RELEASE</version> </parent> <dependencies> <!-- web --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- 整合JSP --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-tomcat</artifactId> </dependency> <dependency> <groupId>org.apache.tomcat.embed</groupId> <artifactId>tomcat-embed-jasper</artifactId> </dependency> <!-- JSTL --> <dependency> <groupId>jstl</groupId> <artifactId>jstl</artifactId> <version>1.2</version> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.6</version> <scope>provided</scope> </dependency> </dependencies> 创建配置文件 application.yml server: port: 8080 spring: mvc: view: # 设置前缀后缀 prefix: / suffix: .jsp 创建 Handler package com.southwind.controller; import com.southwind.entity.Student; import com.southwind.repository.StudentRepository; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.servlet.ModelAndView; @Controller @RequestMapping("/hello") public class HelloHandler { @Autowired private StudentRepository studentRepository; @GetMapping("/index") public ModelAndView index(){ ModelAndView modelAndView = new ModelAndView(); modelAndView.setViewName("index"); modelAndView.addObject("list",studentRepository.findAll()); return modelAndView; } @GetMapping("/deleteById/{id}") public String deleteById(@PathVariable("id") long id){ studentRepository.deleteById(id); return "redirect:/hello/index"; } @PostMapping("/save") public String save(Student student){ studentRepository.saveOrUpdate(student); return "redirect:/hello/index"; } @PostMapping("/update") public String update(Student student){ studentRepository.saveOrUpdate(student); return "redirect:/hello/index"; } @GetMapping("/findById/{id}") public ModelAndView findById(@PathVariable("id") long id){ ModelAndView modelAndView = new ModelAndView(); modelAndView.setViewName("update"); modelAndView.addObject("student",studentRepository.findById(id)); return modelAndView; } } JSP <%@ page contentType="text/html;charset=UTF-8" language="java" %> <%@ page isELIgnored="false" %> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <html> <head> <title>Title</title> </head> <body> <h1>学生信息</h1> <table> <tr> <th>学生编号</th> <th>学生姓名</th> <th>学生年龄</th> <th>操作</th> </tr> <c:forEach items="${list}" var="student"> <tr> <td>${student.id}</td> <td>${student.name}</td> <td>${student.age}</td> <td> <a href="/hello/findById/${student.id}">修改</a> <a href="/hello/deleteById/${student.id}">删除</a> </td> </tr> </c:forEach> </table> <a href="/save.jsp">添加学生</a> </body> </html> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> <form action="/hello/save" method="post"> ID:<input type="text" name="id"/><br/> name:<input type="text" name="name"/><br/> age:<input type="text" name="age"/><br/> <input type="submit" value="提交"/> </form> </body> </html> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> <form action="/hello/update" method="post"> ID:<input type="text" name="id" value="${student.id}" readonly/><br/> name:<input type="text" name="name" value="${student.name}"/><br/> age:<input type="text" name="age" value="${student.age}"/><br/> <input type="submit" value="提交"/> </form> </body> </html>

Spring Boot 整合HTML

Spring Boot 可以结合 Thymeleaf 模版来整合 HTML，使用原生的 HTML 作为视图。

Thymeleaf 模版是面向 Web 和独立环境的 Java 模版引擎，能够处理 HTML、XML、JavaScript、CSS 等。

<p th:text="${message}"></p> pom.xml <!-- 继承父包 --> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.0.7.RELEASE</version> </parent> <dependencies> <!-- web启动jar --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.6</version> <scope>provided</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> </dependencies> appliction.yml server: port: 8080 spring: thymeleaf: prefix: classpath:/templates/ suffix: .html mode: HTML5 encoding: UTF-8 Handler package com.southwind.controller; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RequestMapping; @Controller @RequestMapping("/index") public class IndexHandler { @GetMapping("/index") public String index(){ System.out.println("index..."); return "index"; } } HTML <!DOCTYPE html> <html lang="en" xmlns:th="http://www.thymeleaf.org"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <h1>Hello World</h1> </body> </html>

如果希望客户端可以直接访问 HTML 资源，将这些资源放置在 static 路径下即可，否则必须通过 Handler 的后台映射才可以访问静态资源。

Thymeleaf 常用语法

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

赋值、拼接 @GetMapping("/index2") public String index2(Map<String,String> map){ map.put("name","张三"); return "index"; } <p th:text="${name}"></p> <p th:text="'学生姓名是'+${name}+2"></p> <p th:text="|学生姓名是,${name}|"></p> 条件判断：if/unless

th:if 表示条件成立时显示内容，th:unless 表示条件不成立时显示内容

@GetMapping("/if") public String index3(Map<String,Boolean> map){ map.put("flag",true); return "index"; } <p th:if="${flag == true}" th:text="if判断成立"></p> <p th:unless="${flag != true}" th:text="unless判断成立"></p> 循环 @GetMapping("/index") public String index(Model model){ System.out.println("index..."); List<Student> list = new ArrayList<>(); list.add(new Student(1L,"张三",22)); list.add(new Student(2L,"李四",23)); list.add(new Student(3L,"王五",24)); model.addAttribute("list",list); return "index"; } <table> <tr> <th>index</th> <th>count</th> <th>学生ID</th> <th>学生姓名</th> <th>学生年龄</th> </tr> <tr th:each="student,stat:${list}" th:style="'background-color:'+@{${stat.odd}?'#F2F2F2'}"> <td th:text="${stat.index}"></td> <td th:text="${stat.count}"></td> <td th:text="${student.id}"></td> <td th:text="${student.name}"></td> <td th:text="${student.age}"></td> </tr> </table>

stat 是状态变量，属性：

index 集合中元素的index（从0开始）

count 集合中元素的count（从1开始）

size 集合的大小

current 当前迭代变量

even/odd 当前迭代是否为偶数/奇数（从0开始计算）

first 当前迭代的元素是否是第一个

last 当前迭代的元素是否是最后一个

URL

Thymeleaf 对于 URL 的处理是通过 @{...} 进行处理，结合 th:href 、th:src

<h1>Hello World</h1> <a th:href="@{http://www.baidu.com}">跳转</a> <a th:href="@{http://localhost:9090/index/url/{na}(na=${name})}">跳转2</a> <img th:src="${src}"> <div th:style="'background:url('+ @{${src}} +');'"> <br/> <br/> <br/> </div> 三元运算 @GetMapping("/eq") public String eq(Model model){ model.addAttribute("age",30); return "test"; } <input th:value="${age gt 30?'中年':'青年'}"/>

gt great than 大于

ge great equal 大于等于

eq equal 等于

lt less than 小于

le less equal 小于等于

ne not equal 不等于

switch

@GetMapping("/switch") public String switchTest(Model model){ model.addAttribute("gender","女"); return "test"; } <div th:switch="${gender}"> <p th:case="女">女</p> <p th:case="男">男</p> <p th:case="*">未知</p> </div> 基本对象 #ctx ：上下文对象#vars：上下文变量#locale：区域对象#request：HttpServletRequest 对象#response：HttpServletResponse 对象#session：HttpSession 对象#servletContext：ServletContext 对象 @GetMapping("/object") public String object(HttpServletRequest request){ request.setAttribute("request","request对象"); request.getSession().setAttribute("session","session对象"); return "test"; } <p th:text="${#request.getAttribute('request')}"></p> <p th:text="${#session.getAttribute('session')}"></p> <p th:text="${#locale.country}"></p> 内嵌对象

工具类,可以对从后端传来的数据进行进一步处理

可以直接通过 # 访问。

1、dates：java.util.Date 的功能方法

2、calendars：java.util.Calendar 的功能方法

3、numbers：格式化数字

4、strings：java.lang.String 的功能方法

5、objects：Object 的功能方法

6、bools：对布尔求值的方法

7、arrays：操作数组的功能方法

8、lists：操作集合的功能方法

9、sets：操作集合的功能方法

10、maps：操作集合的功能方法

@GetMapping("/util") public String util(Model model){ model.addAttribute("name","zhangsan"); model.addAttribute("users",new ArrayList<>()); model.addAttribute("count",22); model.addAttribute("date",new Date()); return "test"; } <!-- 格式化时间 --> <p th:text="${#dates.format(date,'yyyy-MM-dd HH:mm:sss')}"></p> <!-- 创建当前时间，精确到天 --> <p th:text="${#dates.createToday()}"></p> <!-- 创建当前时间，精确到秒 --> <p th:text="${#dates.createNow()}"></p> <!-- 判断是否为空 --> <p th:text="${#strings.isEmpty(name)}"></p> <!-- 判断List是否为空 --> <p th:text="${#lists.isEmpty(users)}"></p> <!-- 输出字符串长度 --> <p th:text="${#strings.length(name)}"></p> <!-- 拼接字符串 --> <p th:text="${#strings.concat(name,name,name)}"></p> <!-- 创建自定义字符串 --> <p th:text="${#strings.randomAlphanumeric(count)}"></p>

Spring Boot 数据校验

导入依赖 <dependency> <groupId>javax.validation</groupId> <artifactId>validation-api</artifactId> </dependency> <dependency> <groupId>org.hibernate</groupId> <artifactId>hibernate-validator</artifactId> <version>5.3.6.Final</version> </dependency> 实体类添加注解 注解有@Min、@Max、@NotNull、@NotBlank、@NotEmpty、@Size、@Length package com.southwind.entity; import lombok.Data; import org.hibernate.validator.constraints.Length; import javax.validation.constraints.Min; import javax.validation.constraints.NotEmpty; import javax.validation.constraints.NotNull; @Data public class User { @NotNull(message = "id不能为空") private Long id; @NotEmpty(message = "姓名不能为空") @Length(min = 2,message = "姓名长度不能小于2位") private String name; @Min(value = 16,message = "年龄必须大于16岁") private int age; } 控制器 @Valid注解直接加在变量user之前,会对变量进行数据校验. @GetMapping("/validator") public void validatorUser(@Valid User user,BindingResult bindingResult){ System.out.println(user); if(bindingResult.hasErrors()){ List<ObjectError> list = bindingResult.getAllErrors(); for(ObjectError objectError:list){ System.out.println(objectError.getCode()+"-"+objectError.getDefaultMessage()); } } }

Spring Boot 整合 JDBC

pom.xml <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-jdbc</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.11</version> </dependency> application.yml server: port: 8080 spring: thymeleaf: prefix: classpath:/templates/ suffix: .html mode: HTML5 encoding: UTF-8 datasource: url: jdbc:mysql://localhost:3306/mbtest?serverTimezone=GMT%2B8&useUnicode=true&charaterEncoding=UTF-8 username: root password: root driver-class-name: com.mysql.cj.jdbc.Driver User package com.southwind.entity; import lombok.Data; import org.hibernate.validator.constraints.Length; import javax.validation.constraints.Min; import javax.validation.constraints.NotEmpty; import javax.validation.constraints.NotNull; @Data public class User { @NotNull(message = "id不能为空") private Long id; @NotEmpty(message = "姓名不能为空") @Length(min = 2,message = "姓名长度不能小于2位") private String name; @Min(value = 60,message = "成绩必须大于60分") private double score; } UserRepository package com.southwind.repository; import com.southwind.entity.User; import java.util.List; public interface UserRepository { public List<User> findAll(); public User findById(long id); public void save(User user); public void update(User user); public void deleteById(long id); } UserRepositoryImpl package com.southwind.repository.impl; import com.southwind.entity.User; import com.southwind.repository.UserRepository; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.jdbc.core.BeanPropertyRowMapper; import org.springframework.jdbc.core.JdbcTemplate; import org.springframework.stereotype.Repository; import java.util.List; @Repository public class UserRepositoryImpl implements UserRepository { @Autowired private JdbcTemplate jdbcTemplate; @Override public List<User> findAll() { return jdbcTemplate.query("select * from user",new BeanPropertyRowMapper<>(User.class)); } @Override public User findById(long id) { return jdbcTemplate.queryForObject("select * from user where id = ?",new Object[]{id},new BeanPropertyRowMapper<>(User.class)); } @Override public void save(User user) { jdbcTemplate.update("insert into user(name,score) values(?,?)",user.getName(),user.getScore()); } @Override public void update(User user) { jdbcTemplate.update("update user set name = ?,score = ? where id = ?",user.getName(),user.getScore(),user.getId()); } @Override public void deleteById(long id) { jdbcTemplate.update("delete from user where id = ?",id); } } Handler package com.southwind.controller; import com.southwind.entity.User; import com.southwind.repository.UserRepository; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.*; import java.util.List; @RestController @RequestMapping("/user") public class UserHandler { @Autowired private UserRepository userRepository; @GetMapping("/findAll") public List<User> findAll(){ return userRepository.findAll(); } @GetMapping("/findById/{id}") public User findById(@PathVariable("id") long id){ return userRepository.findById(id); } @PostMapping("/save") public void save(@RequestBody User user){ userRepository.save(user); } @PutMapping("/update") public void update(@RequestBody User user){ userRepository.update(user); } @DeleteMapping("/deleteById/{id}") public void deleteById(@PathVariable("id") long id){ userRepository.deleteById(id); } }

Spring Boot 整合 MyBatis

pom.xml <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.1</version> </dependency> application.yml server: port: 8080 spring: thymeleaf: prefix: classpath:/templates/ suffix: .html mode: HTML5 encoding: UTF-8 datasource: url: jdbc:mysql://localhost:3306/mbtest?serverTimezone=GMT%2B8&useUnicode=true&charaterEncoding=UTF-8 username: root password: root driver-class-name: com.mysql.cj.jdbc.Driver mybatis: mapper-locations: classpath:/mapping/*.xml # 把包名写出 直接选定在mapper中parameterType需要的包名 type-aliases-package: com.southwind.entity UserRepository package com.southwind.mapper; import com.southwind.entity.User; import java.util.List; public interface UserRepository { public List<User> findAll(int index,int limit); public User findById(long id); public void save(User user); public void update(User user); public void deleteById(long id); public int count(); } UserRepository.xml <?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.southwind.mapper.UserRepository"> <select id="findAll" resultType="User"> select * from user limit #{param1},#{param2} </select> <select id="count" resultType="int"> select count(id) from user </select> <select id="findById" parameterType="long" resultType="User"> select * from user where id = #{id} </select> <insert id="save" parameterType="User"> insert into user(name,score) values(#{name},#{score}) </insert> <update id="update" parameterType="User"> update user set name = #{name},score = #{score} where id = #{id} </update> <delete id="deleteById" parameterType="long"> delete from user where id = #{id} </delete> </mapper> User package com.southwind.entity; import lombok.Data; import org.hibernate.validator.constraints.Length; import javax.validation.constraints.Min; import javax.validation.constraints.NotEmpty; import javax.validation.constraints.NotNull; @Data public class User { @NotNull(message = "id不能为空") private Long id; @NotEmpty(message = "姓名不能为空") @Length(min = 2,message = "姓名长度不能小于2位") private String name; @Min(value = 60,message = "成绩必须大于60分") private double score; } Handler package com.southwind.controller; import com.southwind.entity.User; import com.southwind.mapper.UserRepository; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.*; import org.springframework.web.servlet.ModelAndView; @Controller @RequestMapping("/mapper") public class UserMapperHandler { @Autowired private UserRepository userRepository; private int limit = 10; @GetMapping("/findAll/{page}") public ModelAndView findAll(@PathVariable("page") int page){ ModelAndView modelAndView = new ModelAndView(); int index = (page-1)*limit; modelAndView.setViewName("show"); modelAndView.addObject("list",userRepository.findAll(index,limit)); modelAndView.addObject("page",page); //计算总页数 int count = userRepository.count(); int pages = 0; if(count%limit == 0){ pages = count/limit; }else{ pages = count/limit+1; } modelAndView.addObject("pages",pages); return modelAndView; } @GetMapping("/deleteById/{id}") public String deleteById(@PathVariable("id") long id){ userRepository.deleteById(id); return "redirect:/mapper/findAll/1"; } @GetMapping("/findById") public ModelAndView findById(@RequestParam("id") long id){ ModelAndView modelAndView = new ModelAndView(); modelAndView.addObject("user",userRepository.findById(id)); modelAndView.setViewName("update"); return modelAndView; } @PostMapping("/update") public String update(User user){ userRepository.update(user); return "redirect:/mapper/findAll/1"; } @PostMapping("/save") public String save(User user){ userRepository.save(user); return "redirect:/mapper/findAll/1"; } @GetMapping("/redirect/{name}") public String redirect(@PathVariable("name") String name){ return name; } } HTML <!DOCTYPE html> <html xmlns:th="http://www.thymeleaf.org"> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <form action="/mapper/save" method="post"> 用户姓名：<input type="text" name="name" /><br/> 用户成绩：<input type="text" name="score" /><br/> <input type="submit" value="提交"/> </form> </body> </html> <!DOCTYPE html> <html xmlns:th="http://www.thymeleaf.org"> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <form action="/mapper/update" method="post"> 用户ID：<input type="text" name="id" th:value="${user.id}" readonly/><br/> 用户姓名：<input type="text" name="name" th:value="${user.name}" /><br/> 用户成绩：<input type="text" name="score" th:value="${user.score}" /><br/> <input type="submit" value="提交"/> </form> </body> </html> <!DOCTYPE html> <html xmlns:th="http://www.thymeleaf.org"> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> <script type="text/javascript" th:src="@{/jquery-3.3.1.min.js}"></script> <script type="text/javascript"> $(function(){ $("#first").click(function(){ var page = $("#page").text(); page = parseInt(page); if(page == 1){ return false; } window.location.href="/mapper/findAll/1"; }); $("#previous").click(function(){ var page = $("#page").text(); page = parseInt(page); if(page == 1){ return false; } page = page-1; window.location.href="/mapper/findAll/"+page; }); $("#next").click(function(){ var page = $("#page").text(); var pages = $("#pages").text(); if(page == pages){ return false; } page = parseInt(page); page = page+1; window.location.href="/mapper/findAll/"+page; }); $("#last").click(function(){ var page = $("#page").text(); var pages = $("#pages").text(); if(page == pages){ return false; } window.location.href="/mapper/findAll/"+pages; }); }); </script> </head> <body> <h1>用户信息</h1> <table> <tr> <th>用户ID</th> <th>用户名</th> <th>成绩</th> <th>操作</th> </tr> <tr th:each="user:${list}"> <td th:text="${user.id}"></td> <td th:text="${user.name}"></td> <td th:text="${user.score}"></td> <td> <a th:href="@{/mapper/deleteById/{id}(id=${user.id})}">删除</a> <a th:href="@{/mapper/findById(id=${user.id})}">修改</a> </td> </tr> </table> <a id="first" href="javascript:void(0)">首页</a> <a id="previous" href="javascript:void(0)">上一页</a> <span id="page" th:text="${page}"></span>/<span id="pages" th:text="${pages}"></span> <a id="next" href="javascript:void(0)">下一页</a> <a id="last" href="javascript:void(0)">尾页</a><br/> <a href="/mapper/redirect/save">添加用户</a> </body> </html>

Spring Boot 整合 MyBatis Plus

https://blog.csdn.net/PANDORA_A/article/details/107349787

Spring Boot 整合 Spring Security

SpringSecurity是一个安全框架，其核心功能包括认证，授权和攻击防护

创建空的maven工程 1、pom.xml添加依赖

<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-parent</artifactId> <version>2.3.1.RELEASE</version> </parent> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-thymeleaf</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-security</artifactId> </dependency> </dependencies>

权限管理demo：有两个html资源，index和admin。定义两个角色ADMIN和USER。ADMIN权限高，可以访问index和admin两个html文件，而USER只能访问index.html。

2、创建html login.html

<!DOCTYPE html> <html lang="en" xmlns:th="http://www.thymeleaf.org"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <form th:action="@{/login}" method="post"> 用户名:<input type="text" name="username"><br/> 密码:<input type="text" name="password"><br/> <input type="submit" value="登陆"> </form> </body> </html>

index.html

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <h1>hello world</h1> <form action="/logout" method="post"> <input type="submit" value="退出"> </form> </body> </html>

admin.html

<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <title>Title</title> </head> <body> <h1>后台管理系统</h1> <form action="/logout" method="post"> <input type="submit" value="退出" > </form> </body> </html>

3、创建handler

package com.southwind.controller; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PostMapping; @Controller public class HelloHandler { @GetMapping("/index") public String index(){ return "index"; } @GetMapping("/admin") public String admin(){ return "admin"; } @GetMapping("/login") public String login(){ return "login"; } }

4、创建application.yml 设置自定义密码

spring: thymeleaf: prefix: classpath:/templates/ suffix: .html security: user: name: admin password: 1234

5、创建启动类application

package com.southwind; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class Application { public static void main(String[] args) { SpringApplication.run(Application.class,args); } }

6、创建SecurityConfig类

package com.southwind.config; import org.springframework.context.annotation.Configuration; import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder; import org.springframework.security.config.annotation.web.builders.HttpSecurity; import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity; import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter; // 声明为配置类 @Configuration //让websecurity生效 @EnableWebSecurity public class SecurityConfig extends WebSecurityConfigurerAdapter { @Override protected void configure(AuthenticationManagerBuilder auth) throws Exception { auth.inMemoryAuthentication().passwordEncoder(new MyPasswordEncoder()) //设置用户名-密码-添加角色(USER) .withUser("user").password(new MyPasswordEncoder().encode("1234")).roles("USER") .and() //设置第二个用户名-密码-设置两个角色(权限更高) .withUser("admin").password(new MyPasswordEncoder().encode("0000")).roles("USER","ADMIN"); } @Override protected void configure(HttpSecurity http) throws Exception { //设置访问权限 http.authorizeRequests().antMatchers("/admin").hasRole("ADMIN") .antMatchers("/index").access("hasRole('ADMIN') or hasRole('USER')") .anyRequest().authenticated() .and() .formLogin() .loginPage("/login") .permitAll() .and() .logout() .permitAll() .and() .csrf() .disable(); } }

7、在config包（SecurityConfig所在包）下创建MyPasswordEncoder类

package com.southwind.config; import org.springframework.security.crypto.password.PasswordEncoder; public class MyPasswordEncoder implements PasswordEncoder { @Override public String encode(CharSequence charSequence) { return charSequence.toString(); } @Override public boolean matches(CharSequence charSequence, String s) { return s.equals(charSequence.toString()); } }