Flask接口签名sign原理与实例代码浅析
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2023-07-11
Spring学习笔记1之IOC详解尽量使用注解以及java代码
在实战中学习Spring,本系列的最终目的是完成一个实现用户注册登录功能的项目。
预想的基本流程如下:
1、用户网站注册,填写用户名、密码、email、手机号信息,后台存入数据库后返回ok。(学习IOC,mybatis,SpringMVC的基础知识,表单数据验证,文件上传等)
2、服务器异步发送邮件给注册用户。(学习消息队列)
3、用户登录。(学习缓存、Spring Security)
4、其他。
边学习边总结,不定时更新。项目环境为Intellij + Spring4。
一、准备工作。
1、mysql中建库建表。
2、Intellij中创建maven webapp工程。
(1) pom.xml中导入需要的依赖包。
xmlns:xsi="http://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">
xmlns:xsi="http://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">
(2) 工程目录结构如下所示:
二、Mybatis
1、配置mysql数据库的基本信息。
# Database
db.mysql.driverClass = com.mysql.jdbc.Driver
db.mysql.jdbcUrl = jdbc:mysql://localhost:3306/register_notice?useUnicode=true&characterEncoding=utf-8&allowMultiQueries=true
db.mysql.user = root
db.mysql.password = 333
db.minPoolSize = 10
db.maxPoolSize = 100
db.initialPoolSize = 20
db.maxIdleTime = 60
db.acquireIncrement = 5
db.maxStatements = 100
db.idleConnectionTestPeriod = 60
db.acquireRetryAttempts = 30
db.breakAfterAcquireFailure = true
db.testConnectionOnCheckout = false
db.properties
2、配置mybatis.xml以及spring-mybatis.xml。
PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
mybatis.xml
xmlns:xsi="http://w3.org/2001/XMLSchema-instance" xmlns:context="http://springframework.org/schema/context" xmlns:tx="http://springframework.org/schema/tx" xmlns:p="http://springframework.org/schema/p" 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/tx http://springframework.org/schema/tx/spring-tx.xsd"> destroy-method="close"> p:dataSource-ref="dataSource" p:configLocation="classpath:mybatis.xml" p:mapperLocations="classpath*:mapper/*Mapper.xml" /> class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> proxy-target-class="true" />
xmlns:xsi="http://w3.org/2001/XMLSchema-instance"
xmlns:context="http://springframework.org/schema/context"
xmlns:tx="http://springframework.org/schema/tx"
xmlns:p="http://springframework.org/schema/p"
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/tx
http://springframework.org/schema/tx/spring-tx.xsd">
destroy-method="close">
destroy-method="close">
p:dataSource-ref="dataSource" p:configLocation="classpath:mybatis.xml" p:mapperLocations="classpath*:mapper/*Mapper.xml" />
p:dataSource-ref="dataSource"
p:configLocation="classpath:mybatis.xml"
p:mapperLocations="classpath*:mapper/*Mapper.xml" />
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
proxy-target-class="true" />
proxy-target-class="true" />
spring-mybatis.xml
3、创建User类以及UserDao接口。
public class User {
@Size(min = 32, max = 32, message = "uuid应该为32位字符串")
private String id;
@Size(min = 1, max = 32, message = "账号长度应该在1-32位之间")
private String username;
@NotEmpty(message = "密码不能为空")
private String password;
@NotEmpty(message = "email不能为空")
@Email(message = "email格式不正确")
private String email;
@Size(min = 11, max = 11, message = "手机号长度为11位")
private String cellphone;
private long regDate;
public User() {
this.id = UUID.randomUUID().toString().replaceAll("-", "");
this.regDate = 0;
}
public User(String username, String password, String email, String cellphone) {
this(username, password, email, cellphone, new Date().getTime());
}
public User(String username, String password, String email, String cellphone, long regDate) {
this.id = UUID.randomUUID().toString().replaceAll("-", "");
this.username = username;
this.password = password;
this.email = email;
this.cellphone = cellphone;
this.regDate = regDate;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getCellphone() {
return cellphone;
}
public void setCellphone(String cellphone) {
this.cellphone = cellphone;
}
public long getRegDate() {
return regDate;
}
public void setRegDate(long regDate) {
this.regDate = regDate;
}
@Override
public String toString() {
return "[User: id=" + id + ", username=" + username + ", password=" + password + ", email=" + email + ", cellphone=" +
cellphone + ", regDate=" + regDate + "]";
}
}
User.java
User.java中的@NotNull, @NotEmpty, @Size以及@Email等注释暂时忽略,以后解释。
@Repository
public interface UserDao {
void addUser(User user);
User getUserByUsername(String username);
}
4、在src/main/resources/mapper目录下创建UserMapper.xml映射文件,实现UserDao接口中的方法。注:*Mapper.xml文件必须放在src/main/resources目录下,之前放在src/main/java/com/everSeeker/dao目录下,产生了莫名奇妙的错误。
INSERT INTO user(id, username, password, email, cellphone, regDate) VALUES(#{id}, #{username}, #{password}, #{email}, #{cellphone}, #{regDate})
SELECT * FROM user WHERE username=#{username}
UserMapper.xml
三、IOC
1、创建IOC容器,通过注解方式,RootConfig.java。
@Configuration
@ComponentScan(basePackages = {"com.everSeeker"}, excludeFilters = {
@ComponentScan.Filter(type = FilterType.CUSTOM, value = RootConfig.WebPackage.class)})
@ImportResource({"classpath:spring-mybatis.xml"})
public class RootConfig {
public static class WebPackage extends RegexPatternTypeFilter {
public WebPackage() {
super(Pattern.compile("com\\.everSeeker\\.web"));
}
}
}
@Configuration: 表明这是一个配置类。
@ComponentScan: 启用组建扫描,basePackages:需要扫描的基础package。excludeFilters: 符合filter条件的不扫描。
@ImportResource: 引入xml文件。
@PropertySource: 引入properties文件。
2、由于创建的是webapp项目,并且采用了SpringMVC,那么DispatcherServlet是核心。以前的Spring版本中,一般会配置在web.xml中。而在Spring4中,可以在Java代码中来实现。WebAppInitializer.java。
public class WebAppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer { //继承了AbstractAnnotationConfigDispatcherServletInitializer的类会自动配置DispatcherServlet和Spring应用上下文
@Override
protected String[] getServletMappings() { //将DispatcherServlet映射到"/"
return new String[] { "/" };
}
/**
* RootConfig类用来配置ContextLoaderListener创建的应用上下文中的bean,
* 比如@Repository, @Service等组件
*/
@Override
protected Class>[] getRootConfigClasses() {
return new Class>[] { RootConfig.class };
}
/**
* DispatcherServlet加载应用上下文时,使用定义在WebConfig配置类中的bean,
* 用来加载包含Web组件的bean,比如控制器,视图解析器以及处理器映射, @Controller, @RequestMapping等
*/
@Override
protected Class>[] getServletConfigClasses() {
return new Class>[] { WebConfig.class };
}
@Override
protected void customizeRegistration(ServletRegistration.Dynamic registration) {
//限制上传文件的大小不超过2MB,整个请求不超过4M,所有上传的文件都要写到磁盘中
registration.setMultipartConfig(new MultipartConfigElement("/tmp/uploads", 2097152, 4194304, 0));
}
}
3、创建WebConfig.java。
@Configuration
@EnableWebMvc
@ComponentScan("com.everSeeker.web")
public class WebConfig extends WebMvcConfigurerAdapter {
//配置jsp视图解析器
@Bean
public ViewResolver viewResolver() {
InternalResourceViewResolver resourceViewResolver = new InternalResourceViewResolver();
resourceViewResolver.setPrefix("/WEB-INF/views/");
resourceViewResolver.setSuffix(".jsp");
resourceViewResolver.setExposeContextBeansAsAttributes(true);
return resourceViewResolver;
}
//配置multipart解析器, 上传文件用
@Bean
public MultipartResolver multipartResolver() throws IOException {
return new StandardServletMultipartResolver();
}
//配置静态资源的处理
@Override
public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
configurer.enable();
}
}
@Bean: 声明这个方法会创建所需类型的实例,并注册为Spring应用上下文中的bean。
以上所述是给大家介绍的Spring学习笔记1之IOC详解尽量使用注解以及java代码,希望对大家有所帮助,如果大家有任何疑问请给我留言,会及时回复大家的。在此也非常感谢大家对我们网站的支持!
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