idea搭建springdata+mongodb+maven+springmvc

今天我们来学习一下SpringData操作MongoDB。

项目环境：IntelliJ IDEA2017+maven3.5.0+MongoDB 3.2+JDK1.7+spring4.3.8

推荐网站（适合学习各种知识的基础）：http://www.runoob.com/

mongo安装请参考：http://www.runoob.com/mongodb/mongodb-window-install.html

1. 创建maven工程

首相创建maven工程，New project:

这里不使用idea自带maven插件，改用下载好的3.5.0版maven；

由于最近osChina的maven仓库挂掉，推荐大家使用阿里的镜像，速度快的飞起

maven配置：D:\apache-maven-3.5.0\conf\setting.xml中找到mirrors:

<mirrors>

    <mirror>

      <id>alimaven</id>

      <name>aliyun maven</name>

      <url>http://maven.aliyun.com/nexus/content/groups/public/</url>

      <mirrorOf>central</mirrorOf>

    </mirror>

</mirrors>

项目结构如下图，手动创建相关文件夹及文件，并设置文件夹的对应属性：

至此，maven工程创建完毕。

2. 访问mongodb数据方式

这里dao与mongoDao分别为mongoDB的两种查询方式：

(1) dao为JPA的查询方式（请参考springdataJPA）；

(2) mongoDao使用mongoTemplate，类似于关系型数据库使用的jdbcTemplate。

3. 详细代码

先看配置文件

spring-context.xml为最基本的spring配置:

<?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:context="http://www.springframework.org/schema/context"

       xsi:schemaLocation="http://www.springframework.org/schema/beans

       http://www.springframework.org/schema/beans/spring-beans.xsd

       http://www.springframework.org/schema/context

       http://www.springframework.org/schema/context/spring-context.xsd">

    <!-- 开启注解 -->

    <context:annotation-config/>

    <!--扫描service包嗲所有使用注解的类型-->

    <context:component-scan base-package="com.lewis.mongo">

        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>

    </context:component-scan>

    <!-- 导入mongodb的配置文件 -->

    <import resource="spring-mongo.xml"/>

</beans>

spring-web.xml为springmvc的基本配置:

<?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:mvc="http://www.springframework.org/schema/mvc"

       xmlns:context="http://www.springframework.org/schema/context"

       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-4.0.xsd

       http://www.springframework.org/schema/context

       http://www.springframework.org/schema/context/spring-context-4.0.xsd">

    <!--配置springmvc-->

    <!--1.开启springmvc注解模式-->

    <context:annotation-config/>

    <!--简化配置：

        (1)主动注册DefaultAnnotationHandlerMapping,AnnotationMethodHandlerAdapter

        (2)提供一系列功能：数据绑定，数字和日期的format @NumberFormt @DataTimeFormat，xml json默认的读写支持-->

    <mvc:annotation-driven/>

    <!--servlet-mapping-->

    <!--2静态资源默认的servlet配置，

        （1）允许对静态资源的处理：js，gif

        （2）允许使用“/”做整体映射-->

    <!-- 容器默认的DefaultServletHandler处理 所有静态内容与无RequestMapping处理的URL-->

    <mvc:default-servlet-handler/>

    <!--3:配置jsp 显示viewResolver-->

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">

        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>

        <property name="prefix" value="/WEB-INF/views/"/>

        <property name="suffix" value=".jsp"/>

    </bean>

    <!-- 4自动扫描且只扫描@Controller -->

    <context:component-scan base-package="com.lewis.mongo.controller"/>

    <!-- 定义无需Controller的url<->view直接映射 -->

    <mvc:view-controller path="/" view-name="redirect:/hi/hello"/>

</beans>

spring-mongo.xml为mongo配置:

<?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:context="http://www.springframework.org/schema/context"

       xmlns:mongo="http://www.springframework.org/schema/data/mongo"

       xsi:schemaLocation="http://www.springframework.org/schema/beans

       http://www.springframework.org/schema/beans/spring-beans-3.0.xsd

       http://www.springframework.org/schema/context

       http://www.springframework.org/schema/context/spring-context.xsd

       http://www.springframework.org/schema/data/mongo

       http://www.springframework.org/schema/data/mongo/spring-mongo.xsd">

    <!-- 加载mongodb的属性配置文件 -->

    <context:property-placeholder location="classpath*:mongo.properties"/>

    <!-- spring连接mongodb数据库的配置 -->

    <mongo:mongo-client replica-set="${mongo.hostport}" id="mongo">

        <mongo:client-options connections-per-host="${mongo.connectionsPerHost}"

                              threads-allowed-to-block-for-connection-multiplier="${mongo.threadsAllowedToBlockForConnectionMultiplier}"

                              connect-timeout="${mongo.connectTimeout}" max-wait-time="${mongo.maxWaitTime}"

                              socket-timeout="${mongo.socketTimeout}"/>

    </mongo:mongo-client>

    <!-- mongo的工厂，通过它来取得mongo实例,dbname为mongodb的数据库名，没有的话会自动创建 -->

    <mongo:db-factory id="mongoDbFactory" dbname="mongoLewis" mongo-ref="mongo"/>

    <!-- 只要使用这个调用相应的方法操作 -->

    <bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">

        <constructor-arg name="mongoDbFactory" ref="mongoDbFactory"/>

    </bean>

    <!-- mongodb bean的仓库目录，会自动扫描扩展了MongoRepository接口的接口进行注入 -->

    <mongo:repositories base-package="com.lewis.mongo"/>

</beans>

mongo.properties:

mongo.hostport=10.10.16.234:27017

mongo.connectionsPerHost=8

mongo.threadsAllowedToBlockForConnectionMultiplier=4

#连接超时时间

mongo.connectTimeout=1000

#等待时间

mongo.maxWaitTime=1500

mongo.autoConnectRetry=true

mongo.socketKeepAlive=true

#Socket超时时间

mongo.socketTimeout=1500

mongo.slaveOk=true

pom.xml，这里要注意的是junit版本需要4.12以上，不然idea会报错；spring-data-mongodb版本要1.10.1以上；

<?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>

    <properties>

        <!-- spring-framework-bom 版本号-->

        <spring.version>4.3.8.RELEASE</spring.version>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

    </properties>

    <groupId>com.liu</groupId>

    <artifactId>mongo</artifactId>

    <version>1.0-SNAPSHOT</version>

    <packaging>war</packaging>

    <name>mongo Maven Webapp</name>

    <url>http://maven.apache.org</url>

    <dependencies>

        <!--使用junit4，注解的方式测试-->

        <!--<dependency>

            <groupId>junit</groupId>

            <artifactId>junit</artifactId>

            <version>4.11</version>

            <scope>test</scope>

        </dependency>-->

        <!-- https://mvnrepository.com/artifact/junit/junit -->

        <dependency>

            <groupId>junit</groupId>

            <artifactId>junit</artifactId>

            <version>4.12</version>

            <scope>test</scope>

        </dependency>

        <!--日志-->

        <!--日志 slf4j,log4j,logback,common-logging-->

        <!--slf4j是规范/接口-->

        <!--log4j,logback,common-logging是日志实现 本项目使用slf4j + logback -->

        <dependency>

            <groupId>org.slf4j</groupId>

            <artifactId>slf4j-api</artifactId>

            <version>1.7.12</version>

        </dependency>

        <!--实现slf4j并整合-->

        <dependency>

            <groupId>ch.qos.logback</groupId>

            <artifactId>logback-core</artifactId>

            <version>1.1.1</version>

        </dependency>

        <dependency>

            <groupId>ch.qos.logback</groupId>

            <artifactId>logback-classic</artifactId>

            <version>1.1.1</version>

        </dependency>

        <!--数据库相关-->

        <dependency>

            <groupId>mysql</groupId>

            <artifactId>mysql-connector-java</artifactId>

            <version>5.1.22</version>

            <!--maven工作范围 驱动在真正工作的时候使用，故生命周期改为runtime-->

            <scope>runtime</scope>

        </dependency>

        <!--servlet web相关 jstl1.2以上版本就不需要standard这个包了，

        不然会报错： TLD skipped. URI: http://java.sun.com/jstl/core_rt is already defined-->

        <!--<dependency>

            <groupId>taglibs</groupId>

            <artifactId>standard</artifactId>

            <version>1.1.2</version>

        </dependency>-->

        <dependency>

            <groupId>jstl</groupId>

            <artifactId>jstl</artifactId>

            <version>1.2</version>

        </dependency>

        <dependency>

            <groupId>com.fasterxml.jackson.core</groupId>

            <artifactId>jackson-databind</artifactId>

            <version>2.5.4</version>

        </dependency>

        <!--spring-->

        <!--spring核心-->

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-core</artifactId>

            <version>4.3.8.RELEASE</version>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework/spring-asm -->

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-asm</artifactId>

            <version>3.1.4.RELEASE</version>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-beans</artifactId>

            <version>4.3.8.RELEASE</version>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-context</artifactId>

            <version>4.3.8.RELEASE</version>

        </dependency>

        <!--spring dao-->

        <!--<dependency>

            <groupId>org.springframework.data</groupId>

            <artifactId>spring-data-mongodb</artifactId>

            <version>1.8.0.RELEASE</version>

        </dependency>-->

        <!-- https://mvnrepository.com/artifact/org.springframework.data/spring-data-mongodb -->

        <dependency>

            <groupId>org.springframework.data</groupId>

            <artifactId>spring-data-mongodb</artifactId>

            <version>1.10.1.RELEASE</version>

        </dependency>

        <dependency>

            <groupId>org.mongodb</groupId>

            <artifactId>mongo-java-driver</artifactId>

            <version>3.2.2</version>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-tx</artifactId>

            <version>${spring.version}</version>

        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework/spring-aop -->

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-aop</artifactId>

            <version>4.3.8.RELEASE</version>

        </dependency>

        <!--spring web-->

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-web</artifactId>

            <version>4.3.8.RELEASE</version>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-webmvc</artifactId>

            <version>4.3.8.RELEASE</version>

        </dependency>

        <!--spring test-->

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-test</artifactId>

            <version>4.3.8.RELEASE</version>

        </dependency>

        <dependency>

            <groupId>commons-collections</groupId>

            <artifactId>commons-collections</artifactId>

            <version>3.2.2</version>

        </dependency>

        <dependency>

            <groupId>commons-fileupload</groupId>

            <artifactId>commons-fileupload</artifactId>

            <version>1.3.2</version>

        </dependency>

        <dependency>

            <groupId>commons-codec</groupId>

            <artifactId>commons-codec</artifactId>

            <version>1.10</version>

        </dependency>

        <!-- https://mvnrepository.com/artifact/javax/javaee-api -->

        <dependency>

            <groupId>javax</groupId>

            <artifactId>javaee-api</artifactId>

            <version>7.0</version>

            <scope>provided</scope>

        </dependency>

    </dependencies>

    <dependencyManagement>

        <dependencies>

            <dependency>

                <groupId>org.springframework</groupId>

                <artifactId>spring-framework-bom</artifactId>

                <version>${spring.version}</version>

                <type>pom</type>

                <scope>import</scope>

            </dependency>

            <dependency>

                <groupId>net.sf.ehcache</groupId>

                <artifactId>ehcache-core</artifactId>

                <version>2.6.9</version>

            </dependency>

        </dependencies>

    </dependencyManagement>

    <build>

        <finalName>mongo</finalName>

        <plugins>

            <plugin>

                <groupId>org.apache.maven.plugins</groupId>

                <artifactId>maven-compiler-plugin</artifactId>

                <version>3.3</version>

                <configuration>

                    <source>1.6</source>

                    <target>1.6</target>

                </configuration>

            </plugin>

        </plugins>

    </build>

</project>

两个实体类：

Address.java:

package com.lewis.mongo.entity;

/**

 * Created by liu on 2017/6/7.

 */

public class Address {

    private String city;

    private String street;

    private int num;

    public Address() {

    }

    public Address(String city, String street, int num) {

        this.city = city;

        this.street = street;

        this.num = num;

    }

    public String getCity() {

        return city;

    }

    public void setCity(String city) {

        this.city = city;

    }

    public String getStreet() {

        return street;

    }

    public void setStreet(String street) {

        this.street = street;

    }

    public int getNum() {

        return num;

    }

    public void setNum(int num) {

        this.num = num;

    }

    @Override

    public String toString() {

        return "Address{" +

                "city='" + city + '\'' +

                ", street='" + street + '\'' +

                ", num=" + num + '}';

    }

}

Person.java:

package com.lewis.mongo.entity;

import java.io.Serializable;

import org.bson.types.ObjectId;

import org.springframework.data.annotation.Id;

import org.springframework.data.mongodb.core.mapping.Document;

/**

 * Created by liu on 2017/6/7.

 */

@Document(collection = "person")

public class Person implements Serializable {

    @Id

    private ObjectId id;

    private String name;

    private int age;

    private Address address;

    public Person() {

    }

    public Person(String name, int age, Address address) {

        this.name = name;

        this.age = age;

        this.address = address;

    }

    public ObjectId getId() {

        return id;

    }

    public void setId(ObjectId id) {

        this.id = id;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public int getAge() {

        return age;

    }

    public void setAge(int age) {

        this.age = age;

    }

    public Address getAddress() {

        return address;

    }

    public void setAddress(Address address) {

        this.address = address;

    }

    @Override

    public String toString() {

        return "Person{" + "id=" + id +

                ", name='" + name + '\'' +

                ", age=" + age +

                ", address=" + address + '}';

    }

}

JPA的dao，注意这里只要继承MongoRepository不用写注解spring就能认识这是个Repository，MongoRepository提供了基本的增删改查，不用实现便可直接调用，例如testMongo的personDao.save(persons);

PersonDao.java:

package com.lewis.mongo.dao;

import com.lewis.mongo.entity.Person;

import org.bson.types.ObjectId;

import org.springframework.data.mongodb.repository.MongoRepository;

import org.springframework.data.mongodb.repository.Query;

import java.util.List;

/**

 * Created by liu on 2017/6/7.

 */

public interface PersonDao extends MongoRepository<Person, ObjectId> {

    @Query(value = "{'age' : {'$gte' : ?0, '$lte' : ?1}, 'name' : ?2}", fields = "{'name' : 1, 'age' : 1}")

    List<Person> findByAge(int age1, int age2, String name);

}

mongoTemplate的dao，PersonMongoDao.java:

package com.lewis.mongo.mongoDao;

import com.lewis.mongo.entity.Person;

import java.util.List;

/**

 * Created by liu on 2017/6/7.

 */

public interface PersonMongoDao {

    List<Person> findAll();

    void insertPerson(Person user);

    void removePerson(String userName);

    void updatePerson();

    List<Person> findForRequery(String userName);

}

PersonMongoImpl.java:

package com.lewis.mongo.mongoDao;

import com.lewis.mongo.entity.Person;

import org.springframework.data.mongodb.core.MongoTemplate;

import org.springframework.data.mongodb.core.query.Query;

import org.springframework.data.mongodb.core.query.Update;

import org.springframework.data.mongodb.core.query.Criteria;

import org.springframework.stereotype.Repository;

import javax.annotation.Resource;

import java.util.List;

/**

 * Created by liu on 2017/6/7.

 */

@Repository("personMongoImpl")

public class PersonMongoImpl implements PersonMongoDao {

    @Resource

    private MongoTemplate mongoTemplate;

    @Override

    public List<Person> findAll() {

        return mongoTemplate.findAll(Person.class, "person");

    }

    @Override

    public void insertPerson(Person person) {

        mongoTemplate.insert(person, "person");

    }

    @Override

    public void removePerson(String userName) {

        mongoTemplate.remove(Query.query(Criteria.where("name").is(userName)), "person");

    }

    @Override

    public void updatePerson() {

        mongoTemplate.updateMulti(Query.query(Criteria.where("age").gt(3).lte(5)), Update.update("age", 3), "person");

    }

    @Override

    public List<Person> findForRequery(String userName) {

        return mongoTemplate.find(Query.query(Criteria.where("name").is(userName)), Person.class);

    }

}

JPA查询的测试类，PersonDaoTest.java:

import com.lewis.mongo.dao.PersonDao;

import com.lewis.mongo.entity.Address;

import com.lewis.mongo.entity.Person;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.springframework.test.context.ContextConfiguration;

import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import javax.annotation.Resource;

import java.util.ArrayList;

import java.util.List;

/**

 * Created by liu on 2017/6/7.

 */

@RunWith(SpringJUnit4ClassRunner.class)

//告诉junit spring配置文件

@ContextConfiguration({"classpath:spring/spring-context.xml", "classpath:spring/spring-mongo.xml"})

public class PersonDaoTest {

    @Resource

    private PersonDao personDao;

    /*先往数据库中插入10个person*/

    @Test

    public void testMongo() {

        List<Person> persons = new ArrayList<Person>();

        for (int i = 0; i < 10; i++) {

            persons.add(new Person("name" + i, i, new Address("广州市", "天河区", i)));

        }

        personDao.save(persons);

    }

    @Test

    public void findMongo() {

        System.out.println(personDao.findByAge(2, 8, "name6"));

    }

}

mongoTemplate查询的测试类，MongoTemplateTest.java:

import com.lewis.mongo.entity.Address;

import com.lewis.mongo.entity.Person;

import com.lewis.mongo.mongoDao.PersonMongoImpl;

import org.junit.Test;

import org.junit.runner.RunWith;

import org.springframework.test.context.ContextConfiguration;

import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;

import javax.annotation.Resource;

/**

 * Created by liu on 2017/6/7.

 */

@RunWith(SpringJUnit4ClassRunner.class)

//告诉junit spring配置文件

@ContextConfiguration({"classpath:spring/spring-context.xml", "classpath:spring/spring-mongo.xml"})

public class MongoTemplateTest {

    @Resource

    private PersonMongoImpl personMongo;

    @Test

    public void testMongoTemplate() {

        //personMongo.insertPerson(new Person("Lewis",24,new Address("广州","天河",20)));

        personMongo.removePerson("name3");

        personMongo.updatePerson();

        System.out.println(personMongo.findAll());

        System.out.println(personMongo.findForRequery("Lewis"));

    }

}

注意测试前请先通过PersonDaoTest.java中的testMongo()方法向数据库中插入数据。

idea搭建springdata+mongodb+maven+springmvc的更多相关文章

  1. 使用intellij idea搭建MAVEN+springmvc+mybatis框架

    原文:使用intellij idea搭建MAVEN+springmvc+mybatis框架 1.首先使用idea创建一个maven项目 2.接着配置pom.xml,以下为我的配置 <projec ...

  2. Spring MVC 环境搭建（maven+SpringMVC+mybatis+Freemarker）

    Spring MVC 环境搭建(maven+SpringMVC+mybatis+Freemarker) 一.准备工作 1.Eclipse Java EE IDE(4.4.1) 2.JDK 3.Tomc ...

  3. IntelliJ IDEA下Maven SpringMVC+Mybatis入门搭建例子

    很久之前写了一篇SSH搭建例子,由于工作原因已经转到SpringMVC+Mybatis,就以之前SSH实现简单登陆的例子,总结看看SpringMVC+Mybatis怎么实现. Spring一开始是轻量 ...

  4. 搭建项目Maven+springMVC+hibernate时，JUnit測试出现报ClassNotFoundException错误的解决

    近期在搭建Maven+springMVC+hibernate项目,正常启动项目时一切正常.但JUNIT測试时出现报ClassNotFoundException错误,经过细致排查发现没有生成class文 ...

  5. 利用Intellij+MAVEN搭建Spring+Mybatis+MySql+SpringMVC项目详解

    http://blog.csdn.net/noaman_wgs/article/details/53893948 利用Intellij+MAVEN搭建Spring+Mybatis+MySql+Spri ...

  6. maven+springmvc+dubbo+zookeeper

        为什么要用dubbo?   还是让官方来解释吧: http://dubbo.io/User+Guide-zh.htm   http://dubbo.io/   一般 nginx+tomcat ...

  7. 一步步完成Maven+SpringMVC+SpringFox+Swagger整合示例

    本文给出一个整合Maven+SpringMVC+SpringFOX+Swagger的示例,并且一步步给出完成步骤. 本人在做实例时发现 http://blog.csdn.net/zth1002/art ...

  8. 关于Maven+Springmvc+Dubbo+Zookeeper整合

    为什么要用dubbo?   还是让官方来解释吧: http://dubbo.io/User+Guide-zh.htm   http://dubbo.io/   一般 nginx+tomcat  | - ...

  9. 170328、Maven+SpringMVC+Dubbo 简单的入门demo配置

    之前一直听说dubbo,是一个很厉害的分布式服务框架,而且巴巴将其开源,这对于咱们广大程序猿来说,真是一个好消息.最近有时间了,打算做一个demo把dubbo在本地跑起来先. 先copy一段dubbo ...

随机推荐

  1. POJ 2516 Minimum Cost (费用流)

    题面 Dearboy, a goods victualer, now comes to a big problem, and he needs your help. In his sale area ...

  2. [.NET Core] 简单读取 json 配置文件

    简单读取 json 配置文件 背景 目前发现网上的 .NET Core 读取配置文件有点麻烦,自己想搞个简单点的. .NET Core 已经不使用之前的诸如 app.config 和 web.conf ...

  3. 解决Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project autotest_fchtgl: Compilation failure的方法

    在碰到maven install 发现报错 Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.2:comp ...

  4. 分布式架构设计（一） --- 面向服务的体系架构 SOA

    1.1 基于TCP协议的RPC 1.1.1 RPC名词解释 RPC的全称是Remote Process Call,即远程过程调用,RPC的实现包括客户端和服务端,即服务调用方和服务提供方.服务调用方发 ...

  5. Spring MVC简单原理

    Spring MVC原理 针对有Java Web基础.Spring基础和Spring MVC使用经验者. 前言 目前基于Java的web后端,Spring生态应该是比较常见了.虽然现在流行前后端分离, ...

  6. 为什么覆写equals必须要覆写hashCode？

    ============================================= 原文链接: 为什么覆写equals必须要覆写hashCode? 转载请注明出处! ============= ...

  7. 错误代码和UNICODE编程

    程序错误处理 一般错误返回的数据类型有VOID BOOL HANDLE PVOID LONG/DWORD 返回值哪些代表成功和错误需查文档 错误码和解释存放在WinError.h中 使用GetLast ...

  8. python 重要的日志模块logging

    一,logging模块简介 logging模块是Python内置的标准模块,主要用于输出运行日志,可以设置输出日志的等级.日志保存路径.日志文件回滚等:相比print,具备如下优点: 可以通过设置不同 ...

  9. NEO从入门到开窗(2) - 智能合约的面相

    一.啰嗦两句 昨天讲了智能合约的一生,那丫长啥样啊?今儿我就跟各位唠叨唠叨. 二.一个简单的智能合约 下面这段就是NEO实例源码里的一个,干撒用的?聪明的你一眼儿就看出来了吧,就是一个所谓域名合约的增 ...

  10. 网站转变风格的css变化

    网站换肤,是一个比较老的话题了,理论很清晰,就是要根据js 来变换文件加载的css文件,根据需求来加载不同的css文件,有了这个基础就很明确要怎么做了,但是实际上还要记录当前用户的cookie  保证 ...