java 单机接口限流处理方案
240
2022-10-01
SpringMVC 整合SSM框架详解
整合SSM
环境要求
环境:
IDEA
mysql5.7.19
Tomcat9
Maven3.6
要求:
需要熟练掌握MySQL数据库,Spring,javaWeb及MyBatis知识,简单的前端知识;
数据库环境
创建一个存放书籍数据的数据库表
CREATE DATABASE `ssmbuild`;
USE `ssmbuild`;
DROP TABLE IF EXISTS `books`;
CREATE TABLE `books` (
`bookID` INT(10) NOT NULL AUTO_INCREMENT COMMENT '书id',
`bookName` VARCHAR(100) NOT NULL COMMENT '书名',
`bookCounts` INT(11) NOT NULL COMMENT '数量',
`detail` VARCHAR(200) NOT NULL COMMENT '描述',
KEY `bookID` (`bookID`)
) ENGINE=INNODB DEFAULT CHARSET=utf8
INSERT INTO `books`(`bookID`,`bookName`,`bookCounts`,`detail`)VALUES
(1,'Java',1,'从入门到放弃'),
(2,'MySQL',10,'从删库到跑路'),
(3,'linux',5,'从进门到进牢');
基本环境搭建
1、新建一Maven项目!ssmbuild , 添加web的支持
2、导入相关的pom依赖!
3、Maven资源过滤设置
4、建立基本结构和配置框架!
com.kuang.pojo
com.kuang.dao
com.kuang.service
com.kuang.controller
mybatis-config.xml
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
applicationContext.xml
xmlns:xsi="http://w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://springframework.org/schema/beans http://springframework.org/schema/beans/spring-beans.xsd">
xmlns:xsi="http://w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://springframework.org/schema/beans
http://springframework.org/schema/beans/spring-beans.xsd">
Mybatis层编写
1、数据库配置文件 database.properties
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useSSL=true&useUnicode=true&characterEncoding=utf8
jdbc.username=root
jdbc.password=123456
2、IDEA关联数据库
3、编写MyBatis的核心配置文件
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
4、编写数据库对应的实体类 com.kuang.pojo.Books 使用lombok插件!
package com.kuang.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Books {
private int bookID;
private String bookName;
private int bookCounts;
private String detail;
}
5、编写Dao层的 Mapper接口!
package com.kuang.dao;
import com.kuang.pojo.Books;
import java.util.List;
public interface BookMapper {
//增加一个Book
int addBook(Books book);
//根据id删除一个Book
int deleteBookById(int id);
//更新Book
int updateBook(Books books);
//根据id查询,返回一个Book
Books queryBookById(int id);
//查询全部Book,返回list集合
List
}
6、编写接口对应的 Mapper.xml 文件。需要导入MyBatis的包;
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
insert into ssmbuild.books(bookName,bookCounts,detail)
values (#{bookName}, #{bookCounts}, #{detail})
delete from ssmbuild.books where bookID=#{bookID}
update ssmbuild.books
set bookName = #{bookName},bookCounts = #{bookCounts},detail = #{detail}
where bookID = #{bookID}
select * from ssmbuild.books
where bookID = #{bookID}
SELECT * from ssmbuild.books
7、编写Service层的接口和实现类
接口:
package com.kuang.service;
import com.kuang.pojo.Books;
import java.util.List;
//BookService:底下需要去实现,调用dao层
public interface BookService {
//增加一个Book
int addBook(Books book);
//根据id删除一个Book
int deleteBookById(int id);
//更新Book
int updateBook(Books books);
//根据id查询,返回一个Book
Books queryBookById(int id);
//查询全部Book,返回list集合
List
}
实现类:
package com.kuang.service;
import com.kuang.dao.BookMapper;
import com.kuang.pojo.Books;
import java.util.List;
public class BookServiceImpl implements BookService {
//调用dao层的操作,设置一个set接口,方便Spring管理
private BookMapper bookMapper;
public void setBookMapper(BookMapper bookMapper) {
this.bookMapper = bookMapper;
}
public int addBook(Books book) {
return bookMapper.addBook(book);
}
public int deleteBookById(int id) {
return bookMapper.deleteBookById(id);
}
public int updateBook(Books books) {
return bookMapper.updateBook(books);
}
public Books queryBookById(int id) {
return bookMapper.queryBookById(id);
}
public List
return bookMapper.queryAllBook();
}
}
OK,到此,底层需求操作编写完毕!
Spring层
1、配置Spring整合MyBatis,我们这里数据源使用c3p0连接池;
2、我们去编写Spring整合Mybatis的相关的配置文件;spring-dao.xml
xmlns:xsi="http://w3.org/2001/XMLSchema-instance" xmlns:context="http://springframework.org/schema/context" xsi:schemaLocation="http://springframework.org/schema/beans http://springframework.org/schema/beans/spring-beans.xsd http://springframework.org/schema/context https://springframework.org/schema/context/spring-context.xsd">
xmlns:xsi="http://w3.org/2001/XMLSchema-instance"
xmlns:context="http://springframework.org/schema/context"
xsi:schemaLocation="http://springframework.org/schema/beans
http://springframework.org/schema/beans/spring-beans.xsd
http://springframework.org/schema/context
https://springframework.org/schema/context/spring-context.xsd">
3、Spring整合service层
xmlns:xsi="http://w3.org/2001/XMLSchema-instance" xmlns:context="http://springframework.org/schema/context" xsi:schemaLocation="http://springframework.org/schema/beans http://springframework.org/schema/beans/spring-beans.xsd http://springframework.org/schema/context http://springframework.org/schema/context/spring-context.xsd">
xmlns:xsi="http://w3.org/2001/XMLSchema-instance"
xmlns:context="http://springframework.org/schema/context"
xsi:schemaLocation="http://springframework.org/schema/beans
http://springframework.org/schema/beans/spring-beans.xsd
http://springframework.org/schema/context
http://springframework.org/schema/context/spring-context.xsd">
Spring层搞定!再次理解一下,Spring就是一个大杂烩,一个容器!对吧!
SpringMVC层
1、web.xml
xmlns:xsi="http://w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0"> org.springframework.web.filter.CharacterEncodingFilter
xmlns:xsi="http://w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
org.springframework.web.filter.CharacterEncodingFilter
2、spring-mvc.xml
xmlns:xsi="http://w3.org/2001/XMLSchema-instance" xmlns:context="http://springframework.org/schema/context" xmlns:mvc="http://springframework.org/schema/mvc" xsi:schemaLocation="http://springframework.org/schema/beans http://springframework.org/schema/beans/spring-beans.xsd http://springframework.org/schema/context http://springframework.org/schema/context/spring-context.xsd http://springframework.org/schema/mvc https://springframework.org/schema/mvc/spring-mvc.xsd">
xmlns:xsi="http://w3.org/2001/XMLSchema-instance"
xmlns:context="http://springframework.org/schema/context"
xmlns:mvc="http://springframework.org/schema/mvc"
xsi:schemaLocation="http://springframework.org/schema/beans
http://springframework.org/schema/beans/spring-beans.xsd
http://springframework.org/schema/context
http://springframework.org/schema/context/spring-context.xsd
http://springframework.org/schema/mvc
https://springframework.org/schema/mvc/spring-mvc.xsd">
3、Spring配置整合文件,applicationContext.xml
xmlns:xsi="http://wwwJiQmB.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://springframework.org/schema/beans http://springframework.org/schema/beans/spring-beans.xsd">
xmlns:xsi="http://wwwJiQmB.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://springframework.org/schema/beans
http://springframework.org/schema/beans/spring-beans.xsd">
配置文件,暂时结束!Controller 和 视图层编写
1、BookController 类编写 , 方法一:查询全部书籍
@Controller
@RequestMapping("/book")
public class BookController {
@Autowired
@Qualifier("BookServiceImpl")
private BookService bookService;
@RequestMapping("/allBook")
public String list(Model model) {
List
model.addAttribute("list", list);
return "allBook";
}
}
2、编写首页 index.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
a {
text-decoration: none;
color: black;
font-size: 18px;
}
h3 {
width: 180px;
height: 38px;
margin: 100px auto;
text-align: center;
line-height: 38px;
background: deepskyblue;
border-radius: 4px;
}
3、书籍列表页面 allbook.jsp
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
书籍列表 —— 显示所有书籍
书籍编号 书籍名字 书籍数量 书籍详情 操作
更改 |
4、BookController 类编写 , 方法二:添加书籍
@RequestMapping("/toAddBook")
public String toAddPaper() {
return "addBook";
}
@RequestMapping("/addBook")
public String addPaper(Books books) {
System.out.println(books);
bookService.addBook(books);
return "redirect:/book/allBook";
}
5、添加书籍页面:addBook.jsp
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
新增书籍
书籍名称:
书籍数量:
书籍详情:
6、BookController 类编写 , 方法三:修改书籍
@RequestMapping("/toUpdateBook")
public String toUpdateBook(Model model, int id) {
Books books = bookService.queryBookById(id);
System.out.println(books);
model.addAttribute("book",books );
return "updateBook";
}
@RequestMapping("/updateBook")
public String updateBook(Model model, Books book) {
System.out.println(book);
bookService.updateBook(book);
Books books = bookService.queryBookById(book.getBookID());
model.addAttribute("books", books);
return "redirect:/book/allBook";
}
7、修改书籍页面 updateBook.jsp
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
修改信息
书籍名称:
书籍数量:
书籍详情:
8、BookController 类编写 , 方法四:删除书籍
@RequestMapping("/del/{bookId}")
public String deleteBook(@PathVariable("bookId") int id) {
bookService.deleteBookById(id);
return "redirect:/book/allBook";
}
配置Tomcat,进行运行!
到目前为止,这个SSM项目整合已经完全的OK了,可以直接运行进行测试!这个练习十分的重要,大家需要保证,不看任何东西,自己也可以完整的实现出来!
项目结构图
小结及展望
这个是SSM整合案例,一定要烂熟于心!
SSM框架的重要程度是不言而喻的,学到这里,大家已经可以进行基本网站的单独开发。但是这只是增删改查的基本操作。可以说学到这里,大家才算是真正的步入了后台开发的门。也就是能找一个后台相关工作的底线。
或许很多人,工作就做这些事情,但是对于个人的提高来说,还远远不够!
我们后面还要学习一些 SpringMVC 的知识!
Ajax 和 Json
文件上传和下载
拦截器
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