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新增·Android操作数据库Demo
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‎AndroidDatabaseDemo.zip‎

1.39 MB
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‎AndroidDatabaseDemo/.gitignore‎

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*.iml
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.gradle
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/local.properties
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/.idea/caches
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/.idea/libraries
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/.idea/modules.xml
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/.idea/workspace.xml
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/.idea/navEditor.xml
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/.idea/assetWizardSettings.xml
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.DS_Store
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/build
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/captures
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.externalNativeBuild
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.cxx
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local.properties

‎AndroidDatabaseDemo/LoginBackEnd/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>edu.heuet.android.shaohua</groupId>
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<artifactId>shaohua-backend</artifactId>
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<version>1.0</version>
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<name>shaohua-backend</name>
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<!-- FIXME change it to the project's website -->
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<url>http://www.example.com</url>
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<!-- 1、引入的第一个：导入springmvc、spring-aop之类的jar包 -->
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<parent>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-parent</artifactId>
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<version>2.1.4.RELEASE</version>
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</parent>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<maven.compiler.source>1.8</maven.compiler.source>
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<maven.compiler.target>1.8</maven.compiler.target>
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</properties>
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<dependencies>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.11</version>
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<scope>test</scope>
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</dependency>
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<!-- 2、 引入的第二个：导入一些web相关的jar包 -->
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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<!-- 3、 引入的第三个：java连接mysql的connector的jar包 -->
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<dependency>
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<groupId>mysql</groupId>
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<artifactId>mysql-connector-java</artifactId>
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<version>5.1.41</version>
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</dependency>
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<!-- 4、引入的第四个：阿里的德鲁伊连接池，管理mysql连接的jar包 -->
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<dependency>
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<groupId>com.alibaba</groupId>
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<artifactId>druid</artifactId>
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<version>1.1.3</version>
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</dependency>
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<!-- 5、引入的第五个：Mybatis相关的jar包 -->
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<dependency>
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<groupId>org.mybatis.spring.boot</groupId>
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<artifactId>mybatis-spring-boot-starter</artifactId>
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<version>1.3.1</version>
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</dependency>
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<!-- 11、Apache commons-->
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<!-- https://mvnrepository.com/artifact/org.apache.commons/commons-lang3 -->
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<dependency>
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<groupId>org.apache.commons</groupId>
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<artifactId>commons-lang3</artifactId>
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<version>3.4</version>
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</dependency>
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<!-- 12、hibernate validator -->
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<!-- https://mvnrepository.com/artifact/org.hibernate.validator/hibernate-validator -->
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<dependency>
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<groupId>org.hibernate.validator</groupId>
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<artifactId>hibernate-validator</artifactId>
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<version>6.0.13.Final</version>
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</dependency>
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<!-- 13、Log -->
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<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-api -->
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<dependency>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-api</artifactId>
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<version>1.7.25</version>
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</dependency>
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<!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-log4j12 -->
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<dependency>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-log4j12</artifactId>
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<version>1.7.25</version>
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<!-- <scope>test</scope> -->
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</dependency>
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<dependency>
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<groupId>mysql</groupId>
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<artifactId>mysql-connector-java</artifactId>
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<version>8.0.21</version>
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</dependency>
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<dependency>
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<groupId>org.mybatis.generator</groupId>
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<artifactId>mybatis-generator-core</artifactId>
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<version>1.3.5</version>
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</dependency>
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</dependencies>
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<build>
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<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
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<plugins>
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<!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
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<plugin>
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<artifactId>maven-clean-plugin</artifactId>
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<version>3.1.0</version>
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</plugin>
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<!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
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<plugin>
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<artifactId>maven-resources-plugin</artifactId>
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<version>3.0.2</version>
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</plugin>
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<plugin>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>3.8.0</version>
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</plugin>
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<plugin>
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<artifactId>maven-surefire-plugin</artifactId>
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<version>2.22.1</version>
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</plugin>
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<plugin>
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<artifactId>maven-jar-plugin</artifactId>
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<version>3.0.2</version>
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</plugin>
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<plugin>
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<artifactId>maven-install-plugin</artifactId>
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<version>2.5.2</version>
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</plugin>
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<plugin>
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<artifactId>maven-deploy-plugin</artifactId>
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<version>2.8.2</version>
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</plugin>
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<!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
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<plugin>
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<artifactId>maven-site-plugin</artifactId>
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<version>3.7.1</version>
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</plugin>
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<plugin>
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<artifactId>maven-project-info-reports-plugin</artifactId>
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<version>3.0.0</version>
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</plugin>
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<!-- 6、第六个引入的：mybatis的相关插件 -->
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<plugin>
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<groupId>org.mybatis.generator</groupId>
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<artifactId>mybatis-generator-maven-plugin</artifactId>
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<version>1.3.5</version>
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<!-- 注意这里plugin下的dependencies，Maven是无法识别的 -->
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<!-- 比较骚的操作就是，先把下面的dependency放到外面project下面的dependencies -->
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<!-- 然后去右侧工具条Maven执行Reimport，最后再把这些dependency放回来，再进行Reimport，来导入mybatis的插件 -->
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<dependencies>
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<!-- 7、 第七个引入的：mybatis生成器的core相关jar包 -->
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<dependency>
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<groupId>org.mybatis.generator</groupId>
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<artifactId>mybatis-generator-core</artifactId>
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<version>1.3.5</version>
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</dependency>
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<!-- 8、 在mybatis的插件里再引入一遍mysql的连接jar包 -->
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<!-- 上面曾经引入过，是服务端java代码与mysql连接 -->
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<!-- 这里再次声明，是mybatis插件和mysql连接 -->
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<!-- 虽说老师这么写了， 但我个人觉得没必要重复引入jar包啊 -->
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<!-- 老师给出的解释是：要生成的mybatis插件，需要借助相关的依赖 -->
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<dependency>
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<groupId>mysql</groupId>
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<artifactId>mysql-connector-java</artifactId>
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<version>8.0.21</version>
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</dependency>
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</dependencies>
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<!-- executions : 执行-->
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<!-- 9、配置mybatis generator 插件的执行阶段phase以及执行目的goal -->
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<executions>
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<execution>
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<id>mybatis generator</id>
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<phase>package</phase>
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<goals>
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<goal>generate</goal>
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</goals>
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</execution>
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</executions>
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<!-- 10、mybatis generator 插件的相关属性配置 -->
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<configuration>
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<!-- verbose : 冗余的 ， 允许移动生成的文件 -->
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<verbose>true</verbose>
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<!-- 新生成的覆盖旧生成的，实际工作中慎用 -->
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<overwrite>true</overwrite>
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<!-- 指定mybatis配置文件的路径 -->
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<configurationFile>src/main/resources/mybatis-generator.xml</configurationFile>
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</configuration>
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</plugin>
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</plugins>
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</pluginManagement>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<configuration>
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<source>8</source>
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<target>8</target>
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</configuration>
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</plugin>
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</plugins>
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</build>
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</project>

‎AndroidDatabaseDemo/LoginBackEnd/src/main/java/edu/heuet/shaohua/App.java‎

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package edu.heuet.shaohua;
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import org.mybatis.spring.annotation.MapperScan;
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import org.springframework.boot.SpringApplication;
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import org.springframework.boot.autoconfigure.SpringBootApplication;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.RestController;
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@SpringBootApplication(scanBasePackages = {"edu.heuet.shaohua"})
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@RestController
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@MapperScan("edu.heuet.shaohua.dao")
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public class App {
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@GetMapping("/hello")
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public String hello(){
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return "Hello World!";
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}
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public static void main( String[] args ) {
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System.out.println( "Hello World!" );
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SpringApplication.run(App.class);
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}
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}

‎AndroidDatabaseDemo/LoginBackEnd/src/main/java/edu/heuet/shaohua/controller/BaseController.java‎

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package edu.heuet.shaohua.controller;
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import edu.heuet.shaohua.error.BusinessException;
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import edu.heuet.shaohua.error.EmBusinessError;
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import edu.heuet.shaohua.response.CommonReturnType;
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import org.springframework.http.HttpStatus;
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import org.springframework.web.bind.annotation.ExceptionHandler;
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import org.springframework.web.bind.annotation.ResponseBody;
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import org.springframework.web.bind.annotation.ResponseStatus;
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import javax.servlet.http.HttpServletRequest;
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/**
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* @author littlecurl
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*/
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public class BaseController {
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public static final String CONTENT_TYPE_FORMED = "application/x-www-form-urlencoded";
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// 定义ExceptionHandler解决直接抛到Tomcat容器层而未被Controller吸收的Exception
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/**
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* ******************* 对三个注解的解释：*******************
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* 1、@ExceptionHandler(arg) 参数指明要拦截的异常类型，这里直接拦截Exception父类
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* 2、@ResponseStatus(HttpStatus.OK) 如果不加这个注解，返回状态码是500，
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* 加上这个注解后就可以将自定义的错误信息呈现到前端了
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* 3、@ResponseBody 如果不加这个注解，那么返回值就只是一个Object ，
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* 呈现给页面的就是 404 ，
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* 加上这个注解后就会返回Object的JSON序列串
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* @return CommonReturnType 通用返回对象
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*/
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@ExceptionHandler(Exception.class)
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@ResponseStatus(HttpStatus.OK)
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@ResponseBody
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public Object handlerException(HttpServletRequest request, Exception ex){
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// Map<String, Object> responseData = new HashMap<>();
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if (ex instanceof BusinessException){
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BusinessException businessException = (BusinessException)ex;
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// responseData.put("errorCode",businessException.getCode());
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// responseData.put("errorMsg",businessException.getMsg());
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return CommonReturnType.create(businessException.getCode(),businessException.getMsg());
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} else {
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// responseData.put("errorCode", EmBusinessError.UNKNOWN_ERROR.getCode());
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// responseData.put("errorMsg",EmBusinessError.UNKNOWN_ERROR.getMsg());
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return CommonReturnType.create(EmBusinessError.UNKNOWN_ERROR.getCode(),EmBusinessError.UNKNOWN_ERROR.getMsg());
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}
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}
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}

‎AndroidDatabaseDemo/LoginBackEnd/src/main/java/edu/heuet/shaohua/controller/NewsController.java‎

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package edu.heuet.shaohua.controller;
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import edu.heuet.shaohua.dataobject.NewsDO;
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import edu.heuet.shaohua.response.CommonReturnType;
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import edu.heuet.shaohua.service.NewsService;
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import org.springframework.beans.factory.annotation.Autowired;
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import org.springframework.stereotype.Controller;
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import org.springframework.web.bind.annotation.GetMapping;
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import org.springframework.web.bind.annotation.RequestMapping;
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import org.springframework.web.bind.annotation.RequestParam;
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import org.springframework.web.bind.annotation.ResponseBody;
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import java.util.ArrayList;
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import java.util.List;
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@Controller
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@RequestMapping("/news")
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public class NewsController extends BaseController {
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@Autowired
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NewsService newsService;
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@GetMapping("/detail/id")
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@ResponseBody
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public CommonReturnType detailById(@RequestParam(name = "id") long id) {
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NewsDO newsDO = newsService.selectDetailById(id);
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List<NewsDO> newsDOList = new ArrayList<>();
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newsDOList.add(newsDO);
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return CommonReturnType.create(newsDOList);
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}
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@GetMapping("/detail/title")
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@ResponseBody
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public CommonReturnType detailByTitle(@RequestParam(name = "title") String title) {
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List<NewsDO> newsDOList = newsService.selectDetailByTitle(title);
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return CommonReturnType.create(newsDOList);
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}
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@GetMapping("/list")
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@ResponseBody
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public CommonReturnType list() {
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List<NewsDO> newsDOList = newsService.selectAll();
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return CommonReturnType.create(newsDOList);
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}
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}

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