SpringBoot第二天

 

一,SpringBoot 整合 jsp 技术

1,创建项目

2,修改 pom 文件,添加坐标

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.10.RELEASE</version> </parent> <groupId>com.bjsxt</groupId> <artifactId>08-spring-boot-view-jsp</artifactId> <version>0.0.1-SNAPSHOT</version> <!-- jdk1.7 --> <properties> <java.version>1.7</java.version> </properties> <dependencies> <!-- springBoot 的启动器 --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- jstl --> <dependency> <groupId>javax.servlet</groupId> <artifactId>jstl</artifactId> </dependency> <!-- jasper --> <dependency> <groupId>org.apache.tomcat.embed</groupId> <artifactId>tomcat-embed-jasper</artifactId> <scope>provided</scope> </dependency> </dependencies> </project>

3,创建 springBoot 的全局配置文件,application.properties

spring.mvc.view.prefix=/WEB-INF/jsp/
spring.mvc.view.suffix=.jsp

4,创建 Controller

/**
 * SpringBoot 整合 jsp
 *
 * */
 @Controller
 public class UserController {
 /* *
 处理请求,产生数据
 */
 @RequestMapping("/showUser")
 public String showUser(Model model){
 List<Users> list = new ArrayList<>();
 list.add(new Users(1,"张三",20));
 list.add(new Users(2,"李四",22));
 list.add(new Users(3,"王五",24));
//需要一个 Model 对象
 model.addAttribute("list", list);
 //跳转视图
 return "userList";
}
}

5,创建 jsp

<%@ page language="java" contentType="text/html; 
charset=UTF-8" pageEncoding="UTF-8"%>
 <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 <html>
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
 <title>Insert title here</title>
 </head>
 <body>
 <table border="1" align="center" width="50%">
 <tr>
 <th>ID</th>
 <th>Name</th>
 <th>Age</th>
 </tr>
<c:forEach items="${list }" var="user">
 <tr>
 <td>${user.userid }</td>
 <td>${user.username }</td>
 <td>${user.userage }</td>
 </tr>
 </c:forEach>
 </table>
 </body>
 </html>

6,创建启动类

/**
 * SpringBoot 启动类 *
 * */
 @SpringBootApplication
 public class App {
public static void main(String[] args) {
 SpringApplication.run(App.class, args); 
}
}

二,SpringBoot 整合 Freemarker


1,创建项目

 

2,修改 pom 添加坐标

<project xmlns="http://maven.apache.org/POM/4.0.0" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
http://maven.apache.org/xsd/maven-4.0.0.xsd"> 
<modelVersion>4.0.0</modelVersion>
 <parent>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-parent</artifactId>
 <version>1.5.10.RELEASE</version> </parent> <groupId>com.bjsxt</groupId>
<artifactId>09-spring-boot-view-freemarker</artifactId>
 <version>0.0.1-SNAPSHOT</version>
<properties>
 <java.version>1.7</java.version>
 </properties>

<dependencies>
 <!-- springBoot 的启动器 -->
 <dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-web</artifactId>
 </dependency>
 <!-- freemarker 启动器的坐标 -->
 <dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-freemarker</artifactId>
 </dependency>
 </dependencies>
 </project>

3,编写视图
注意: springBoot 要求模板形式的视图层技术的文件必须要放到 src/main/resources 目录下必 须要一个名称为 templates

 

<html>
 <head>
 <title>展示用户数据</title>
 <meta charset="utf-9"></meta>
 </head>
<body>
<table border="1" align="center" width="50%">
<tr>
<th>ID</th>
 <th>Name</th>
 <th>Age</th> </tr>
<#list list as user >
<tr>
 <td>${user.userid}</td>
 <td>${user.username}</td>
 <td>${user.userage}</td>
 </tr>
 </#list>
 </table>
 </body>
 </html>

4,创建 Controller

/**
 * SpringBoot 整合 jsp *
 * */
 @Controller
 public class UserController {
 /* * 处理请求,产生数据 */
 @RequestMapping("/showUser")
 public String showUser(Model model){
 List<Users> list = new ArrayList<>();
 list.add(new Users(1,"张三",20));
 list.add(new Users(2,"李四",22));
 list.add(new Users(3,"王五",24));

//需要一个 Model 对象
 model.addAttribute("list", list);
 //跳转视图
 return "userList";
}
}

5,创建启动器

/**
 * SpringBoot 启动类 
*
* */
 @SpringBootApplication
 public class App {
public static void main(String[] args) {
 SpringApplication.run(App.class, args); 
}
}

三,SpringBoot 整合 Thymeleaf (重点讲解)
1.创建 Thymeleaf 的入门项目
1.1 创建项目

1.2修改 pom 文件添加坐标

<project xmlns="http://maven.apache.org/POM/4.0.0"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 <modelVersion>4.0.0</modelVersion>
 <parent>
 <groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId> <version>1.5.10.RELEASE</version>
 </parent>
 <groupId>com.bjsxt</groupId>
 <artifactId>10-spring-boot-view-thymeleaf</artifactId>
 <version>0.0.1-SNAPSHOT</version>
<properties>
 <java.version>1.7</java.version>
 </properties>
<dependencies>
 <!-- springBoot 的启动器 -->
 <dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-web</artifactId>
 </dependency>
 <!-- springBoot 的启动器 -->
 <dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-thymeleaf</artifactId>
 </dependency>
 </dependencies>
 </project>

1.3创建存放视图的目录


目录位置:src/main/resources/templates templates:该目录是安全的。意味着该目录下的内容是不允许外界直接访问的。

2.Thymeleaf 的基本使用

2.1Thymeleaf特点:

Thymelaef 是通过他特定语法对 html 的标记做渲染。


2.2编写 Controller

/**
 * Thymeleaf 入门案例 *
 * */
 @Controller
 public class DemoController {
 @RequestMapping("/show")
 public String showInfo(Model model){
 model.addAttribute("msg", "Thymeleaf 第一个案例");
 return "index";
 }
 }

2.3创建视图 .html

<!DOCTYPE html>
 <html>
 <head>
 <meta charset="UTF-8">
 <title>Thymeleaf 入门</title>
 </head>
 <body>
 <span th:text="Hello"></span>
 <hr/>
 <span th:text="${msg}"></span>
 </body>
 </html>

2.4编写启动类

/**
 *
 *Thymeleaf 入门案例
 * */
 @SpringBootApplication
 public class App {
public static void main(String[] args) {
 SpringApplication.run(App.class, args); 
}
}

2.5 解决异常

2.5.1 解决异常方式 1


让 html 的标记按照严禁的语法去编写。

2.5.2 解决异常方式 2


Thymeleaf.jar:更新为 3.0 以上的版本 thymeleaf-layout-dialect.jar:更新为 2.0 以上的版本
更换 thymeleaf 的 jar 包的版本

 

<project xmlns="http://maven.apache.org/POM/4.0.0" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
http://maven.apache.org/xsd/maven-4.0.0.xsd">
 <modelVersion>4.0.0</modelVersion>
 <parent>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.10.RELEASE</version>
 </parent>
 <groupId>com.bjsxt</groupId>
 <artifactId>10-spring-boot-view-thymeleaf</artifactId>
 <version>0.0.1-SNAPSHOT</version>
<properties>
 <java.version>1.7</java.version> <thymeleaf.version>3.0.2.RELEASE</thymeleaf.version>
<thymeleaf-layout-dialect.version>2.0.4</thymeleaf-layout-dialect.versi on>
 </properties>
<dependencies>
 <!-- springBoot 的启动器 -->
 <dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-web</artifactId>
 </dependency>
 <!-- springBoot 的启动器 -->
 <dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-thymeleaf</artifactId>
 </dependency>
 </dependencies>
 </project>

3.Thymeleaf 语法详解
3.1变量输出与字符串操作


3.1.1th:text
th:text 在页面中输出值
3.1.2th:value
th:value 可以将一个值放入到 input 标签的 value 中

3.1.3 判断字符串是否为空


Thymeleaf 内置对象 注意语法:

1,调用内置对象一定要用#

2,大部分的内置对象都以 s 结尾 strings、numbers、dates

${#strings.isEmpty(key)} 判断字符串是否为空,如果为空返回 true,否则返回 false
${#strings.contains(msg,'T')} 判断字符串是否包含指定的子串,如果包含返回 true,否则返回 false
${#strings.startsWith(msg,'a')} 判断当前字符串是否以子串开头,如果是返回 true,否则返回 false
${#strings.endsWith(msg,'a')} 判断当前字符串是否以子串结尾,如果是返回 true,否则返回 false
${#strings.length(msg)}
返回字符串的长度
${#strings.indexOf(msg,'h')} 查找子串的位置,并返回该子串的下标,如果没找到则返回-1
${#strings.substring(msg,13)} ${#strings.substring(msg,13,15)} 截取子串,用户与 jdkString 类下 SubString 方法相同
${#strings.toUpperCase(msg)} ${#strings.toLowerCase(msg)}
字符串转大小写。

3.2日期格式化处理
${#dates.format(key)}
格式化日期,默认的以浏览器默认语言为格式化标准
${#dates.format(key,'yyy/MM/dd')}
按照自定义的格式做日期转换
${#dates.year(key)} ${#dates.month(key)} ${#dates.day(key)} year:取年 Month:取月 Day:取日

3.3条件判断

3.3.1th:if

<span th:if="${sex} == ' 男 '"> 性别:男 </span>
 <span th:if="${sex} == ' 女 '"> 性别:女 </span>

3.3.2th:switch

<div th:switch="${id}">
 <span th:case="1">ID 为 1</span>
 <span th:case="2">ID 为 2</span>
<span th:case="3">ID 为 3</span> 
</div>

3.4迭代遍历


3.4.1th:each

@RequestMapping("/show3")
 public String showInfo3(Model model){
 List<Users> list = new ArrayList<>();
 list.add(new Users(1,"张三",20));
 list.add(new Users(2,"李四",22));
 list.add(new Users(3,"王五",24));
 model.addAttribute("list", list);
 return "index3";
 } 
<table border="1">
 <tr>
 <th>ID</th>
 <th>Name</th>
 <th>Age</th>
 </tr>
 <tr th:each="u : ${list}">
 <td th:text="${u.userid}"></td>
 <td th:text="${u.username}"></td>
 <td th:text="${u.userage}"></td>
 </tr> 
</table>

3.4.2ht:each 状态变量

@RequestMapping("/show3")
 public String showInfo3(Model model){
 List<Users> list = new ArrayList<>();
 list.add(new Users(1,"张三",20));
 list.add(new Users(2,"李四",22));
 list.add(new Users(3,"王五",24));
 model.addAttribute("list", list);
 return "index3";
} 
<table border="1">
 <tr>
 <th>ID</th>
 <th>Name</th>
 <th>Age</th>
 <th>Index</th>
 <th>Count</th>
 <th>Size</th>
 <th>Even</th>
 <th>Odd</th>
 <th>First</th>
 <th>lase</th>
 </tr>
 <tr th:each="u,var : ${list}">
 <td th:text="${u.userid}"></td>
 <td th:text="${u.username}"></td>
 <td th:text="${u.userage}"></td>
 <td th:text="${var.index}"></td>
 <td th:text="${var.count}"></td>
 <td th:text="${var.size}"></td>
 <td th:text="${var.even}"></td>
 <td th:text="${var.odd}"></td>
 <td th:text="${var.first}"></td>
 <td th:text="${var.last}"></td>
 </tr>
 </table> 

状态变量属性

1,index:当前迭代器的索引 从 0 开始

2,count:当前迭代对象的计数 从 1 开始

3,size:被迭代对象的长度

4,even/odd:布尔值,当前循环是否是偶数/奇数 从 0 开始

5,first:布尔值,当前循环的是否是第一条,如果是返回 true 否则返回 false

6,last:布尔值,当前循环的是否是最后一条,如果是则返回 true 否则返回 false

3.4.3th:each 迭代 Map

@RequestMapping("/show4")
 public String showInfo4(Model model){
 Map<String, Users> map = new HashMap<>();
 map.put("u1", new Users(1,"张三",20));
 map.put("u2", new Users(2,"李四",22));
map.put("u3", new Users(3,"王五",24));
 model.addAttribute("map", map);
 return "index4";
}
 
<table border="1">
 <tr>
 <th>ID</th>
 <th>Name</th>
 <th>Age</th>
 </tr>
 <tr th:each="maps : ${map}">
 <td th:text="${maps}"></td>
 </tr>
 </table>
 <th/>
 <table border="1">
 <tr>
 <th>ID</th>
 <th>Name</th>
 <th>Age</th>
 </tr>
 <tr th:each="maps : ${map}">
 <td th:each="entry:${maps}" th:text="${entry.value.userid}" ></td>
 <td th:each="entry:${maps}" th:text="${entry.value.username}"></td>
 <td th:each="entry:${maps}" th:text="${entry.value.userage}"></td> </tr>
 </table>

3.5域对象操作


3.5.1HttpServletRequest

request.setAttribute("req", "HttpServletRequest");

Request:<span th:text="${#httpServletRequest.getAttribute('req')}"></span><br/>

3.5.2HttpSession

request.getSession().setAttribute("sess", "HttpSession");

Session:<span th:text="${session.sess}"></span><br/>

3.5.3ServletContext

request.getSession().getServletContext().setAttribute("app", "Application");

Application:<span th:text="${application.app}"></span>

3.6URL 表达式

th:href th:src

3.6.1url 表达式语法

基本语法:@{}

3.6.2URL 类型

3.6.2.1绝对路径 <a th:href="@{http://www.baidu.com}">绝对路径</a><br/>

3.6.2.2 相对路径

1)相对于当前项目的根 相对于项目的上下文的相对路径 <a th:href="@{/show}">相对路径</a>

2) 相对于服务器路径的根 <a th:href="@{~/project2/resourcename}">相对于服务器的根</a>

3.6.3 在 url 中实现参数传递

<a th:href="@{/show(id=1,name=zhagnsan)}">相对路径-传参</a>

3.6.4 在 url 中通过 restful 风格进行参数传递

<a th:href="@{/path/{id}/show(id=1,name=zhagnsan)}"> 相 对 路 径 - 传 参 -restful</a>

 

SpringBoot 整合 SpringMVC+MyBatis

四、 创建项目

需求分析:通过使用 SpringBoot+SpringMVC+MyBatis 整合实现一 个对数据库中的 users 表的 CRUD 的操作

1 修改 pom 文件

<project xmlns="http://maven.apache.org/POM/4.0.0" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 
<modelVersion>4.0.0</modelVersion>
 <parent>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-parent</artifactId> 
 <version>1.5.10.RELEASE</version>
 </parent>
 <groupId>com.bjsxt</groupId>
 <artifactId>12-spring-boot-springmvc-mybatis</artifactId>
 <version>0.0.1-SNAPSHOT</version>
 <properties>
 <java.version>1.7</java.version> 
 <thymeleaf.version>3.0.2.RELEASE</thymeleaf.version>
 <thymeleaf-layout-dialect.version>2.0.4</thymeleaf-layout-dialect.ve rsion> 
 </properties>
 <dependencies>
 <!-- springBoot 的启动器 -->
 <dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-web</artifactId>
 </dependency>
 <!-- web 启动器 -->
 <dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-thymeleaf</artifactId>
 </dependency>
 <!-- Mybatis 启动器 -->
 <dependency>
 <groupId>org.mybatis.spring.boot</groupId>
 <artifactId>mybatis-spring-boot-starter</artifactId> 
 <version>1.1.1</version>
 </dependency>
 <!-- mysql 数据库驱动 -->
 <dependency> 
<groupId>mysql</groupId>
 <artifactId>mysql-connector-java</artifactId> 
 </dependency>
 <!-- druid 数据库连接池 -->
 <dependency>
 <groupId>com.alibaba</groupId>
 <artifactId>druid</artifactId>
 <version>1.0.9</version>
 </dependency>
 </dependencies>
 </project>

2 添加 application.properties 全局配置文件

spring.datasource.driverClassName=com.mysql.jdbc.Driver 

spring.datasource.url=jdbc:mysql://localhost:3306/ssm

 spring.datasource.username=root spring.datasource.password=root

spring.datasource.type=com.alibaba.druid.pool.DruidDataSource

mybatis.type-aliases-package=com.bjsxt.pojo

3 数据库表设计

CREATETABLE`users`(
 `id`int(11)NOTNULLAUTO_INCREMENT,
 `name`varchar(255)DEFAULTNULL,
 `age`int(11)DEFAULTNULL, PRIMARYKEY(`id`)
)ENGINE=InnoDBDEFAULTCHARSET=utf8;


五、 添加用户


1 创建实体类

public class Users {

private Integer id;

private String name;

private Integer age;

public Integer getId() { return id; }

public void setId(Integer id) { this.id = id; }

public String getName() { return name; }

public void setName(String name) { this.name = name; }

public Integer getAge() { return age; }

public void setAge(Integer age) { this.age = age; }
}

 

2 创建 mapper 接口以及映射配置文件

import com.bjsxt.pojo.Users;
public interface UsersMapper {
void insertUser(Users users);
}



<?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.bjsxt.mapper.UsersMapper">

<insert id="insertUser" parameterType="users">

insert into users(name,age) values(#{name},#{age})

</insert>

</mapper>

 

3 创建业务层

@Service
@Transactional
public class UsersServiceImpl implements UsersService {

@Autowired
private UsersMapper usersMapper;

@Override
public void addUser(Users users) {
 this.usersMapper.insertUser(users); 
}
}

 

4 创建 Controller

@Controller
 @RequestMapping("/users")
 public class UsersController {
@Autowired
 private UsersService usersService;
/** * 页面跳转 */
 @RequestMapping("/{page}")
 public String showPage(@PathVariable String page){ return page; }
/**
* 添加用户 */
 @RequestMapping("/addUser")
 public String addUser(Users users){
 this.usersService.addUser(users);
 return "ok";
 }
}

 


5 编写页面

<!DOCTYPE html> 
<html>
 <head>
 <meta charset="UTF-8"> 
<title>添加用户</title> </head>
 <body>
<form th:action="@{/users/addUser}" method="post">
 用户姓名:<input type="text" name="name"/><br/>
 用户年龄:<input type="text" name="age"/><br/>
 <input type="submit" value=" 确 定 "/><br/>
 </form>
 </body>
 </html>

 <!DOCTYPE html>
 <html>
 <head>
 <meta charset="UTF-8">
 <title>操作提示页面</title> 
</head> 
<body> 操作成功!! ! </body>
 </html>

 


6 启动类

@SpringBootApplication
 @MapperScan("com.bjsxt.mapper")
//@MapperScan 用户扫描MyBatis的Mapper接口
public class App {
public static void main(String[] args) { SpringApplication.run(App.class, args); }
}

 


六、 查询用户
1 在 mapper 接口中以及映射配置文件中添加相关代码

List<Users> selectUsersAll();

<select id="selectUsersAll" resultType="users"> select id,name,age from users </select>

2 在业务层中添加查询方法

@Override public List<Users> findUserAll() { return this.usersMapper.selectUsersAll(); }

3 在 Controller 中添加方法

/**
* 查询全部用户 */
 @RequestMapping("/findUserAll")
 public String findUserAll(Model model){
 List<Users> list = this.usersService.findUserAll();
 model.addAttribute("list", list);
 return "showUsers";
 }

 


4 添加页面

<!DOCTYPE html>
 <html>
 <head>
 <meta charset="UTF-8">
 <title>展示用户数据</title>
 </head>
 <body>
 <table border="1" style="width:300px;">
 <tr>
 <th>用户 ID</th>
 <th>用户姓名</th>
 <th>用户年龄</th>
 </tr> 
<tr th:each="user : ${list}">
 <td th:text="${user.id}"></td>
 <td th:text="${user.name}"></td>
 <td th:text="${user.age}"></td>
 </tr>
 </table>
 </body>
 </html>

 


七、 用户更新
1 更新用户之前的查询,并将数据在页面中回显
1.1修改 mapper 接口以及映射配置文件

Users selectUsersById(Integer id);

<select id="selectUsersById" resultType="users">

select id,name,age from users where id = #{value}

</select>

 

1.2修改业务层代码

@Override

public Users findUserById(Integer id) { return this.usersMapper.selectUsersById(id); }

 

1.3修改 Controller

/** * 根据用户 id 查询用户 */
 @RequestMapping("/findUserById")
 public String findUserById(Integer id,Model model){
 Users user = this.usersService.findUserById(id);
 model.addAttribute("user", user);
 return "updateUser";
 }

 


1.4添加页面 updateUsers.html

<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> </head> <body> <form th:action="@{/users/editUser}" method="post"> <input type="hidden" name="id" th:field="${user.id}"/> 用户姓名:<input type="text" name="name" th:field="${user.name}"/><br/> 用户年龄:<input type="text" name="age" th:field="${user.age}"/><br/> <input type="submit" value=" 确 定 "/><br/> </form> </body> </html>

 


1.5修改 showUsers.html 页面添加操作功能

<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>展示用户数据</title> </head> <body> <table border="1" style="width:300px;">
<tr> <th>用户 ID</th> <th>用户姓名</th> <th>用户年龄</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.age}"></td> <td> <a th:href="@{/users/findUserById(id=${user.id})}">更
新用户</a>
</td> </tr> </table> </body> </html>

 


2 用户更新
2.1修改 mapper 接口以及映射配置文件

void updateUser(Users users); 


<update id="updateUser" parameterType="users">
 update users set name=#{name} ,age=#{age} where id=#{id} 
</update>

 


2.2修改业务层代码

@Override public void updateUser(Users users) { this.usersMapper.updateUser(users); }

 

2.3修改 Controller

/**
* 更新用户 */

@RequestMapping("/editUser") public String editUser(Users users){ this.usersService.updateUser(users); return "ok"; }

 


八、 删除用户
1 修改 mapper 接口以及映射配置文件

void deleteUserById(Integer id); 


<delete id="deleteUserById"> delete from users where id = #{value} </delete>

 


2 修改业务层代码

@Override public void deleteUserById(Integer id) { this.usersMapper.deleteUserById(id); }

 


3 修改 Controller

/**
* 删除用户 */
 @RequestMapping("/delUser")
 public String delUser(Integer id){ 
this.usersService.deleteUserById(id); 
return "redirect:/users/findUserAll";
 }

 


4 修改 showUsers.html

<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>展示用户数据</title>
</head> <body> <table border="1" style="width:300px;"> <tr> <th>用户 ID</th> <th>用户姓名</th> <th>用户年龄</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.age}"></td> <td> <a th:href="@{/users/findUserById(id=${user.id})}">更 新用户</a> <a th:href="@{/users/delUser(id=${user.id})}">删除用户 </a> </td> </tr> </table> </body> </html>

 

posted @ 2019-01-22 23:43  人心冇变  阅读(199)  评论(0编辑  收藏  举报