spring boot实现ssm功能

Posted 2020-10-17 Sniper_ZL

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spring 和 mybatis 整合的那篇: ssm(2) . 配置文件比ssm(1) 更多, 在做项目的时候, 配置文件是一个让人头大的事情.

那么在spring boot中, 实现相同功能, 需不需要做那么多配置呢.

一. 从pom.xml 开始

<?xml version="1.0" encoding="UTF-8"?>
<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>

    <groupId>org.elvin</groupId>
    <artifactId>boot</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>boot</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.9.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!--view : thymeleaf模板-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
        </dependency>

        <!--db : 数据库相关-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.6</version>
        </dependency>

        <!--tools : joda-time-->
        <dependency>
            <groupId>joda-time</groupId>
            <artifactId>joda-time</artifactId>
            <version>2.6</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

pom.xml文件, 直观的感觉, 就是非常的短, 非常的少. 简洁

二. 配置文件

#配置项目端口和根路径
server:
  port: 8080
  context-path: /boot

spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql:///test?useUnicode=true&characterEncoding=utf-8
    username: root
    password: root
  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true
  thymeleaf:
     cache: false
logging:
  level: warn
  file: ./boot.log

三. 实体类

package org.elvin.boot.pojo;

import javax.persistence.*;

/**
 * author: Elvin
 * Date: 2017/12/4 15:37
 * Description:
 */
@Entity
@Table(name="book")
public class Book {

    @Id
    @GeneratedValue
    private Integer id;

    private String name;

    private String publishTime;

    private Integer price;

    @Override
    public String toString() {
        return "Book{" +
                "id=" + id +
                ", name=\'" + name + \'\\\'\' +
                ", publishTime=\'" + publishTime + \'\\\'\' +
                ", price=" + price +
                \'}\';
    }

    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 String getPublishTime() {
        return publishTime;
    }

    public void setPublishTime(String publishTime) {
        this.publishTime = publishTime;
    }

    public Integer getPrice() {
        return price;
    }

    public void setPrice(Integer price) {
        this.price = price;
    }
}

通过注解, 可以映射到数据中的表. 由于在前面设置了 ddl-auto:update , 那么在每次启动的时候, 都会去检测数据库, 是否有这张表, 如果没有, 则会新增, 如果有, 则会修改表.

四. Repository

package org.elvin.boot.repository;

import org.elvin.boot.pojo.Book;
import org.springframework.data.jpa.repository.JpaRepository;

import java.util.List;

/**
 * author: Elvin
 * Date: 2017/12/5 16:58
 * Description:
 */
public interface BookRepository extends JpaRepository<Book, Integer>  {
/*
    @Query()
    public Page<Book> myQuery();*/
}

这里使用的并不是 mybatis 的写sql的方式, 但是很大一部分的表操作, jpa 标准都可以完成, 如果想写自定义sql, 可以通过方法上加 @Query 注解的方式来写.

五. service 和实现类

package org.elvin.boot.service;

import org.elvin.boot.pojo.Book;

import java.util.List;

public interface BookService {

    public List<Book> findAll();

    public Book findOne(Integer id);

    public void put(Book book);

    public void remove(Integer id);

}

package org.elvin.boot.serviceimpl;

import org.elvin.boot.pojo.Book;
import org.elvin.boot.pojo.PageInfo;
import org.elvin.boot.repository.BookRepository;
import org.elvin.boot.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * author: Elvin
 * Date: 2017/12/5 17:03
 * Description:
 */
@Service
public class BookServiceImpl implements BookService {

    @Autowired
    private BookRepository bookRepository;

    @Override
    public List<Book> findAll(){
       List<Book> list =  bookRepository.findAll();
       return list;
    }

    @Override
    public Book findOne(Integer id){
        Book book = bookRepository.findOne(id);
        return book;
    }

    @Override
    public void put(Book book) {
        bookRepository.save(book);
    }

    @Override
    public void remove(Integer id) {
        bookRepository.delete(id);
    }

}

put在这里, 承担新增和修改的责任. 不管是新增还是修改, 都是调用的 jpa的save方法.

区别在于, 是否传入了id.

没有传id -> 直接新增

传入了id -> 根据id进行查询 -> 没有数据 -> 新增

　　　　　　　　　|-> 有数据 -> 修改

六. controller

返回数据格式, 稍微做了一下封装.

package org.elvin.boot.pojo;

public interface ResStatus {
   String SUCCESS = "success";
   String FAIL = "fail";
   String ERROR = "error";
}

package org.elvin.boot.pojo;

/**
 * author: Elvin
 * Date: 2017/12/6 10:40
 * Description:
 */
public class ResObj {
    private String msg;

    private Integer Code;

    private Object obj;

    public ResObj() {
    }

    public ResObj(String msg, Integer code, Object obj) {
        this.msg = msg;
        Code = code;
        this.obj = obj;
    }

    @Override
    public String toString() {
        return "ResObj{" +
                "msg=\'" + msg + \'\\\'\' +
                ", Code=" + Code +
                ", obj=" + obj +
                \'}\';
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public Integer getCode() {
        return Code;
    }

    public void setCode(Integer code) {
        Code = code;
    }

    public Object getObj() {
        return obj;
    }

    public void setObj(Object obj) {
        this.obj = obj;
    }
}

再来看controller.

package org.elvin.boot.controller;

import org.elvin.boot.pojo.Book;
import org.elvin.boot.pojo.ResObj;
import org.elvin.boot.pojo.ResStatus;
import org.elvin.boot.service.BookService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

/**
 * author: Elvin
 * Date: 2017/12/6 10:36
 * Description:
 */
@RestController
@RequestMapping("third")
public class ThirdController {

    private Logger logger = LoggerFactory.getLogger(ThirdController.class);

    @Autowired
    private BookService bookService;

    @PostMapping("put")
    public ResObj put(Book book){
        ResObj res = new ResObj(ResStatus.FAIL, 0, null);
        try{
            bookService.put(book);
            res.setMsg(ResStatus.SUCCESS);
            res.setCode(1);
            res.setObj(book);
        }
        catch (Exception e){
            logger.error(e.getMessage());
        }

        return res;
    }

    @PostMapping("delete/{id}")
    public ResObj delete(@PathVariable Integer id){
        ResObj res = new ResObj(ResStatus.FAIL, 0, null);
        try{
            bookService.remove(id);
            res.setMsg(ResStatus.SUCCESS);
            res.setCode(1);
        }
        catch (Exception e){
            logger.error(e.getMessage());
        }

        return res;
    }

    @RequestMapping(value = "getAll", method = {RequestMethod.GET, RequestMethod.POST })
    public ResObj getAll(){
        ResObj res = new ResObj(ResStatus.FAIL, 0, null);
        try{
            res.setObj(bookService.findAll());
            res.setMsg(ResStatus.SUCCESS);
            res.setCode(1);
        }
        catch (Exception e){
            logger.error(e.getMessage());
        }

        return res;
    }

    @RequestMapping(value = "getById/{id}", method = {RequestMethod.GET, RequestMethod.POST })
    public ResObj getById(@PathVariable Integer id){
        ResObj res = new ResObj("fail", 0, null);
        try{
            res.setObj(bookService.findOne(id));
            res.setMsg(ResStatus.SUCCESS);
            res.setCode(1);

            /*int a = 0;
            int c = 1 / a;*/
        }
        catch (Exception e){
            logger.error(e.getMessage());
        }

        return res;
    }
}

七. 结果

首先新增一条数据, 然后再查询出来, 没有啥问题. 然后调用同样的方法, 修改数据

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