前端

AJAX请求

$ajax({
	url : "",
	data : {


	},
	type : "",
	dataType : "",
	success : function(){

	}
})

url 不以"/"开头，以webapp下的目录开头，比如workbench/xxx/xxx/xxx.jsp

web.xml 4.0

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.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">
</web-app>

jsp页面字符编码、拿路径

置顶写

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + request.getContextPath() + "/";
%>

在head标签里写<base href="<%=basePath%>">
将html改成jsp之后，删除所有路径中的 ../

加了base标签之后，相对路径全部失效，必须使用绝对路径。（从webapp下开始）

后端

MySQL链接URL

语句 jdbc:mysql://localhost:3306/ssm?serverTimezone=UTC

JDK编译版本

pom文件中

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.8.0</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
    </plugins>
  </build>

pom 资源文件

    <resources>
      <resource>
        <directory>src/main/java</directory>
        <includes>
          <include>**/*.properties</include>
          <include>**/*.xml</include>
        </includes>
        <filtering>false</filtering>
      </resource>
    </resources>

MyBatis逆向工程文件

```xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN" "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">

<generatorConfiguration>
    <!--指定连接数据库的JDBC 驱动包所在位置，指定到你本机的完整路径：根据具体情况修改-->
    <classPathEntry location="D:\PROGRAM\MySQL\mysql-connector-java-8.0.20\mysql-connector-java-8.0.20.jar"/>
    <!--配置table表信息内容体，targetRuntime 指定采用MyBatis3的版本-->
    <context id="tables" targetRuntime="MyBatis3">
        <!--抑制生成注释，由于生成的注释都是英文的，可以不让它生成-->
        <commentGenerator>
            <property name="suppressAllComments" value="true" />
        </commentGenerator>
        <!--配置数据库连接信息：根据具体情况修改-->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver" connectionURL="jdbc:mysql://localhost:3306/springboot?serverTimezone=UTC" userId="root" password="123456">
            <property name="nullCatalogMeansCurrent" value="true"/>

        </jdbcConnection>


        <!--生成model类，targetPackage指定model类的包名，targetProject指定生成的model放在哪个工程下面：根据具体情况修改-->
        <javaModelGenerator targetPackage="com.daihan.springboot.model" targetProject="src/main/java">
            <property name="enableSubPackages" value="false"/>
            <property name="trimStrings" value="false"/>
        </javaModelGenerator>
        <!--生成MyBatis的Mapper.xml文件，targetPackage指定mapper.xml文件的包名，targetProject指定生成的mapper.xml放在哪个工程下面-->
        <sqlMapGenerator targetPackage="com.daihan.springboot.mapper" targetProject="src/main/java">
            <property name="enableSubPackages" value="false"/>
        </sqlMapGenerator>
        <!--生成MyBatis的Mapper接口类文件,targetPackage指定Mapper接口类的包名，targetProject指定生成的Mapper接口放在哪个工程下面-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.daihan.springboot.mapper" targetProject="src/main/java">
            <property name="enableSubPackages" value="false"/>
        </javaClientGenerator>


        <!--数据库表名及对应的Java模型类名-->
        <table tableName="t_Student" domainObjectName="Student" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false" />
    </context>
</generatorConfiguration>

把jar包导入maven中

在jar包所在目录下执行cmd
输入命令

mvn install:install-file -Dfile=jar包名称.jar -DgroupId=maven对应groupid -DartifactId=maven对应artifactId -Dversion=4.2版本号 -Dpackaging=jar

Mysql URL

mysql://localhost:3306/database?useUnicode=true&characterEncoding=utf8&autoReconnect=true&rewriteBatchedStatements=TRUE

后端接受并处理JSON

接受参数

@RequestBody 接受请求体
@RequestHeader 接受请求头

//这里分别接受请求体为Data泛型的list，接受请求头中的id为myId
public ResponseEntity courseDataSync(@RequestBody List<Data> data,@RequestHeader("id") String myId) {
    
	//具体Java语句
}                  

Data类定义

@Data
@AllArgsConstructor
@NoArgsConstructor
public class UpstreamSyncCourseData {
    

    private String id;
    private String name;
    private String description;
    private String announcement = "";

	//json中的course_start_time对应Data类中的courseStartTime变量
    @JsonProperty(value = "course_start_time")
    private Long courseStartTime;
    @JsonProperty(value = "advance_days")
    private Integer courseCreateTime;
}

输出JSON

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

public class MyTest {
    
    public static void main(String[] args) throws JsonProcessingException {
    
        Phone phone = new Phone();
        phone.setName("小米");
        phone.setColor("红色");
        phone.setPrice(2000);

        ObjectMapper mapper = new ObjectMapper();
        String value = mapper.writeValueAsString(phone);
        System.out.println(value);
        //{"name":"小米","color":"红色","price":2000}
    }
}