Mac下查看java版本和JDK版本
2021-07-16 本文已影响0人
loongod
查看Java版本
java -version
---
➜ ~ java -version
java version "1.8.0_291"
Java(TM) SE Runtime Environment (build 1.8.0_291-b10)
Java HotSpot(TM) 64-Bit Server VM (build 25.291-b10, mixed mode)
查看JDK版本
/usr/libexec/java_home -V
---
➜ ~ /usr/libexec/java_home -V
Matching Java Virtual Machines (2):
1.8.291.10 (x86_64) "Oracle Corporation" - "Java" /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home
1.8.0_74 (x86_64) "Oracle Corporation" - "Java SE 8" /Library/Java/JavaVirtualMachines/jdk1.8.0_74.jdk/Contents/Home
/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home
IntelliJ IDEA
1. mac IDEA自动生成构造函数
control + fn + enter 选择 Constructor
另外这个快捷键还有其它功能，Getter、Setter、Getter and Setter 、equals() and hashCode() 、toString()等。
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Maven
1. 命令行编译
在命令中，进入到pom.xml所在目录，输入以下命令：
$ mvn clean package
如果一切顺利，即可在target目录下获得编译后自动打包的jar。
静态资源导出问题
<build>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
</resources>
</build>
连接数据库
jdbc.driver=com.mysql.jdbc.Driver
# 如果使用的是MySQL8.0+，增加一个时区的配置 &serverTimezone=Asia/Shanghai
jdbc.url=jdbc:mysql://localhost:3306/test?useSSL=true&useUnicode=true&characterEncoding=utf8&serverTimezone=Asia/Shanghai
jdbc.username=root
jdbc.password=123456
常用配置头
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd ">
<import resource="classpath:spring-dao.xml"/>
</beans>
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
</configuration>
springmvc web.xml配置
<?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">
<display-name>Archetype Created Web Application</display-name>
<!-- 过滤器解决乱码 -->
<filter>
<filter-name>characterEncodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>characterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!--springmvc的核心控制器-->
<servlet>
<servlet-name>SpringMVC</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!--配置servlet的初始化参数，读取springMVC的配置文件，创建spring容器-->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param>
<!--配置servlet启动时加载对象-->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>SpringMVC</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
springmvc 配置
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<!--配置spring创建容器时扫描的包-->
<context:component-scan base-package="loong.controller"></context:component-scan>
<!-- 让spring mvc 不处理静态资源 .css .js .html -->
<!-- <mvc:default-servlet-handler/>-->
<!--开启注解MVC支持-->
<!-- <mvc:annotation-driven />-->
<!-- 处理请求返回json字符串的乱码问题 -->
<!--解决json 乱码配置-->
<mvc:annotation-driven>
<mvc:message-converters register-defaults="true">
<bean class="org.springframework.http.converter.StringHttpMessageConverter">
<constructor-arg value="UTF-8"/>
</bean>
<bean class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="objectMapper">
<bean class="org.springframework.http.converter.json.Jackson2ObjectMapperFactoryBean">
<property name="failOnEmptyBeans" value="false"/>
</bean>
</property>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>
<!--配置视图解析器-->
<bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
</beans>
springmvc的拦截器配置
<!-- 拦截器配置 -->
<mvc:interceptors>
<mvc:interceptor>
<!-- 包括这个请求下的所有的请求 -->
<mvc:mapping path="/**"/>
<bean class="loong.intercept.InterceptController"/>
</mvc:interceptor>
</mvc:interceptors>
设置和获取 Cookie
@RequestMapping("/login")
public String login(@RequestParam("username") String username,
@RequestParam("password") String password,
HttpSession session,
HttpServletRequest request,
HttpServletResponse response) {
// 把用户的信息存在session中
session.setAttribute("userLoginInfo", username);
// 获取cookie
Cookie[] cookies = request.getCookies();
for (Cookie cookie : cookies) {
System.out.println(cookie.getName() + ":" + cookie.getValue());
}
// 设置cookie
Cookie cookie = new Cookie("username", username);
cookie.setHttpOnly(true);
cookie.setPath("/");
cookie.setDomain("localhost");
response.addCookie(cookie);
return "OK";
}
依赖
文件上传
<!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -->
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.4</version>
</dependency>
<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
<scope>provided</scope>
</dependency>
<!-- 文件上传配置 -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- 请求的编码格式，必须和jsp的pageEncoding属性一致，以便正确读取表单的内容，默认为ISO-8859-1 -->
<property name="defaultEncoding" value="utf-8"/>
<!-- 上传文件大小上限，单位为字节 （10485760 = 10M） -->
<property name="maxUploadSize" value="10485760"/>
<property name="maxInMemorySize" value="40960"/>
</bean>
// 方式1
// @RequestParam("file") 将name=file控件得到的文件封装成CommonsMultipartFile对象
// 批量上传CommonsMultipartFile则为数组即可
@RequestMapping("/upload")
public String upload(@RequestParam("file") CommonsMultipartFile file,
HttpServletRequest request) throws IOException {
// 获取文件名
String uploadFileName = file.getOriginalFilename();
// 如果文件名为空， 返回error
if (uploadFileName.equals("")) {
return "file is not exsit";
}
System.out.println("上传文件名：" + uploadFileName);
// 上传路径保存设置
String path = request.getServletContext().getRealPath("/upload");
// 如果路径不存在，则创建一个
File realPath = new File(path);
if (!realPath.exists()) {
realPath.mkdir();
}
System.out.println("上传文件保存地址：" + realPath);
// 文件输入流
InputStream is = file.getInputStream();
// 文件输出流
OutputStream os = new FileOutputStream(new File(realPath, uploadFileName));
// 读取写入
int len = 0;
byte[] buffer = new byte[1024];
while ((len = is.read(buffer)) != -1) {
os.write(buffer,0, len);
os.flush();
}
os.close();
is.close();
return "upload-ok";
}
// 方式2
@RequestMapping("/upload2")
public String upload2(@RequestParam("file")CommonsMultipartFile file,
HttpServletRequest request) throws IOException {
// 上传路径保存设置
String path = request.getServletContext().getRealPath("/upload");
File realPath = new File(path);
if (!realPath.exists()) {
realPath.mkdir();
}
// 上传文件地址
System.out.println("上传文件保存地址：" + realPath);
// 通过CommonsMultiparFile的方法直接写文件
file.transferTo(new File(realPath + "/" + file.getOriginalFilename()));
return "upload-ok";
}
SpringBoot多模块Mapper问题
org.apache.ibatis.binding.BindingException: Invalid bound statement (not found):
-
检查mapper与xml文件对应与配置是否匹配
-
修改yml的mybatis配置
mybatis:
mapperLocations: classpath:mapper/*.xml
# 改为扫描全部导入模块
mapperLocations: classpath*:mapper/*.xml
- Maven配置
# 如果上边还没解决可以尝试增加maven配置
<build>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.xml</include>
</includes>
</resource>
<resource>
<directory>src/main/resources</directory>
</resource>
</resources>
</build>
