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正文：

以道御术 / 以术识道

我们来演示一下前后端分离的项目如何进行通讯传参

SpringBoot项目创建与使用的过程

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目前企业里这一类项目大多数都是SSM框架了。以前很火的SSH现在被使用的并不多。其实呢，SSH真的坑，会有很多配置上的问题。

SpringBoot+SSM框架整合

来一步一步看看

上图是完整的项目结构

首先写一个实体类

配合上数据库的表

package com.example.demo.model.bean;

import java.io.Serializable;

public class User implements Serializable {

    private static final long serialVersionUID = -5611386225028407298L;

    private Integer id;
    private String name;
    private String password;
    private String address;

    // 可以省略get和set方法，大家自己设置即可
    // 我们写实体类记得要写完整
    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 getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", password='" + password + '\'' +
                ", address='" + address + '\'' +
                '}';
    }
}

SET FOREIGN_KEY_CHECKS=0;

-- ----------------------------
-- Table structure for user
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) NOT NULL,
  `password` varchar(255) NOT NULL,
  `address` varchar(255) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES ('1', 'JB', '111', '美国');
INSERT INTO `user` VALUES ('2', 'BL', '123', '新加坡');

第二步：项目工程的pom

<?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 https://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>2.0.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <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>
        <!-- springboot推荐的模板引擎，要想映射HTML/JSP，必须引入thymeleaf -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- mybatis -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>

        <!-- 热部署用，改变代码不需要重启项目  -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
        </dependency>

        <!-- mysql连接  -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>


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

</project>

这是配置文件

# server config
server.port: 8081

# mysql
spring.datasource.url: jdbc:mysql://localhost:3306/umanager?useSSL=false&serverTimezone=Hongkong&characterEncoding=utf-8&autoReconnect=true
spring.datasource.username: root
spring.datasource.password: 1111
spring.datasource.driver-class-name: com.mysql.cj.jdbc.Driver
spring.datasource.dbcp2.validation-query: 'select 1'
spring.datasource.dbcp2.test-on-borrow: true
spring.datasource.dbcp2.test-while-idle: true
spring.datasource.dbcp2.time-between-eviction-runs-millis: 27800
spring.datasource.dbcp2.initial-size: 5
spring.datasource.dbcp2.min-idle: 5
spring.datasource.dbcp2.max-idle: 100
spring.datasource.dbcp2.max-wait-millis: 10000

# thymleaf
spring.thymeleaf.cache : false

# mybatis
mybatis.mapper-locations: classpath:mapper/*.xml
mybatis.configuration.map-underscore-to-camel-case: true

package com.example.demo.model.dao;


import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;

import com.example.demo.model.bean.User;


@Mapper
public interface UserDAO {

    public User find(@Param("name")String name, @Param("password")String password);

    // 注：额，快捷键  CRTL+Shift+O，快捷导入所有import，很实用
}

package com.example.demo.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.servlet.ModelAndView;

import com.example.demo.model.bean.User;
import com.example.demo.model.dao.UserDAO;

import javax.annotation.Resource;

// 这里提一提：@RestController = @Controller + @ResponseBody
@RestController
public class BasicController {

//    @Autowired idea写这个容易导致下面注入的显示红杠杠
    @Resource
    private UserDAO userDAO;

    @GetMapping(value = "")
    public String index() {
        return "login"; // 此处表示返回值是一个值为“login”的String。不指向界面的原因是类的注解是@RestController
    }


    @GetMapping(value = "index.hy")
    public ModelAndView index2() {
        return new ModelAndView("login"); // 此处指向界面
    }

    //下面这个是登录的方法，我们这里需要传入两个参数
    @GetMapping(value = "login.hy")
    public Object login(String name, String password) {
        System.out.println("传入参数：name=" + name + ", password=" + password);
        if (StringUtils.isEmpty(name)) {
            return "name不能为空";
        } else if (StringUtils.isEmpty(password)) {
            return "password不能为空";
        }
        User user = userDAO.find(name, password);
        if (user != null) {
            return user;
        } else {
            return "用户名或密码错误";
        }
    }

}

<?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.example.demo.model.dao.UserDAO">
    <select id="find" resultType="com.example.demo.model.bean.User">
    SELECT id, name, password, address from user where name = #{name} and password = #{password}
  </select>
</mapper>

<!DOCTYPE html>
<html>
<!-- meta这一句指定编码格式，能够防止中文乱码  -->
<meta charset="UTF-8" />
<head>
    <title>登录</title>
</head>
<body>
<form action="/login.hy" method="GET">
    用户名：<input type="text" id="name" name="name" />
    密码：  <input type="password" id="password" name="password" />
    <input type="button" value="登录" onclick="submit()" />
</form>
</body>
</html>

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