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springboot-util's Introduction

springboot-study

springboot

使用 SpringBoot + MyBatis 搭建的微信小程序。areadisplay 中包含了小程序所需要的代码,t_area.sql 是数据库导出的结构文件,src 目录下为主要的后端代码。

包括了一些配置信息与基本的增删改查代码,刚入门的同学可以参考这个 demo。

springboot-chart

柱状图、条形图、饼图数据的简单封装。在做一些报表统计时如果涉及到图表,可以参考这个 demo。

参考 xwjie 的开源代码,修改了一部分,方便以后用到项目中去。

效果图 avatar

springboot-cors

Spring Boot 结合 CORS 在服务端解决 AJAX 跨域问题的 demo。

1.使用 CorsConfiguration 配置

@Configuration
public class CorsConfig {
    private static final String ORIGIN = "Origin";
    private static final String HEADERS = "Access-Control-Request-Headers";
    
    /**
     * 通过设置自定义 CorsFilter 过滤器支持跨域
     *
     * @return
     */
    @Bean
    public MyCorsFilter injectCorsFilter() {
        return new MyCorsFilter();
    }

    private CorsConfiguration buildConfig() {
        CorsConfiguration corsConfiguration = new CorsConfiguration();

        corsConfiguration.addAllowedOrigin("*");
        // 设置支持带 Cookie 的跨域请求
        corsConfiguration.setAllowCredentials(true);
        corsConfiguration.addAllowedHeader("*");
        corsConfiguration.addAllowedMethod("*"); 
        // 设置非简单请求的预检命令缓存时间,单位 's'
        corsConfiguration.setMaxAge(1728000L);
        
        return corsConfiguration;
    }
}

2.使用过滤器配置

public class MyCorsFilter extends OncePerRequestFilter {
    private static final String ORIGIN = "Origin";
    private static final String HEADERS = "Access-Control-Request-Headers";
    
    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) 
            throws ServletException, IOException {
        // 获取请求头中的 'Origin' 信息
        String origin = request.getHeader(ORIGIN);
        // 获取请求头中的 'header' 信息
        String headers = request.getHeader(HEADERS);
        
        /**
         * 1.支持任何域名跨域访问
         * 当 'Access-Control-Allow-Origin' 设置为 '*' 时,不能解决带 Cookie 的跨域
         */
        if (!StringUtils.isEmpty(origin)) {
            response.setHeader("Access-Control-Allow-Origin", origin);
        }

        /**
         * 2.支持自定义请求头的跨域
         */
        if (!StringUtils.isEmpty(headers)) {
            response.setHeader("Access-Control-Allow-Headers", headers);
        }
        
        // 3.设置支持带 Cookie 的跨域请求
        response.setHeader("Access-Control-Allow-Credentials", "true");
        // 4.设置允许跨域请求的方法形式 'GET'、'DELETE' 等
        response.setHeader("Access-Control-Allow-Methods", "*");
        // 5.设置非简单请求的预检命令缓存时间,单位 's'
        response.setHeader("Access-Control-Max-Age", "1728000");

        if ("OPTIONS".equals(request.getMethod())) {
            response.setStatus(HttpServletResponse.SC_OK);
        } else {
            filterChain.doFilter(request, response);
        }
            
    }
}

springboot-error

Spring Boot 可以根据 HTTP 的请求头(accept)信息,判断客户端想要什么类型的返回数据(HTML OR JSON),可以在 BasicErrorController 类中查看。

在有模板引擎的情况下,Spring Boot 底层会扫描 templates/error/×××.html 页面,根据 HTTP 的响应码找到对应的错误提示页面,在该页面下也可以通过表达式获取一些错误提示信息。

如果没有配置模板引擎,则扫描 static/error/×××.html 页面。

这个 demo 对异常与错误进行了整合,当出现异常与 404 错误时,用浏览器访问会跳转到 templates/error/404.html 页面,其他客户端访问时会返回内置与自定义的 JSON 数据。

统一异常处理类

@ControllerAdvice
public class GlobalExceptionHandler {
    
    @ExceptionHandler(RuntimeException.class)
    public String handlexception(Exception e, HttpServletRequest request) {
        Map<String, Object> map = new HashMap<>(16);
        
        map.put("code", 0);
        map.put("message", "出异常啦");
        
        // 设置异常处理的状态码为 404
        request.setAttribute("javax.servlet.error.status_code", 404);
        // 将错误信息封装成 map 保存在转发域中
        request.setAttribute("myErrorInfo", map);
        
        // 出现异常时转发到 'error' 请求,跳转到 404 页面
        return "forward:/error";
    }
}

自定义 Error Attributes 方案

@Component
public class GlobalErrorAttributes extends DefaultErrorAttributes{

    @Override
    public Map<String, Object> getErrorAttributes(WebRequest webRequest, boolean includeStackTrace) {
        Map<String, Object> map = super.getErrorAttributes(webRequest, includeStackTrace);
        // 获取异常处理中的错误信息,'0' 表示从转发域中获取
        Map<String, Object> myErrorMap = (Map<String, Object>) webRequest.getAttribute("myErrorInfo", 0);
        
        // 模板页面,JSON 都可以获取
        map.put("test", "测试信息");
        // 模板页面不能获取,JSON 可以
        map.put("myErrorInfo", myErrorMap);
        
        return map;
    }
}

现在开发基本都是前后端分离的,后端只负责返回 JSON 数据。关于前后端分离异常信息的处理,可以参考 springboot-mybaits-plus 中的代码。

springboot-jsp

Spring Boot 整合 JSP 开发的 demo,基于 Spring Boot2.0 以上版本,使用本地 tomcat 容器。需要注意的是,本地 tomcat 容器版本必须支持 Spring Boot 的版本,否则启动 tomcat 时会报错。 在新建项目的时候注意选择 war 包。

demo 基于 Spring Boot 2.03、Tomcat-8.5.31。

pom 文件

<!-- 嵌入式的 tomcat 设置成  provided-->
<dependency>
	<groupId>org.springframework.boot</groupId>
	<artifactId>spring-boot-starter-tomcat</artifactId>
	<scope>provided</scope>
</dependency>

springboot-jxls

Spring Boot 整合 jxls 实现 Excel 文档的导出与下载。

Excel 文件导出

    /**
     *  导出 Excel
     * 
     * @param source 模板文件路径
     * @param target 目标文件(文件下载时的路径)
     * @param beansMaps
     * @return 下载文件路径
     * @throws Exception
     */
    public static String export(String source, String target, Map<String, Object> beansMaps) throws Exception {
        String[] sourceArrays = source.split("\\.");
        source = TEMPLATE_PATH + File.separator + source;
        target = SAVE_PATH + File.separator + sourceArrays[0] + "-" + System.currentTimeMillis() + "." + sourceArrays[1];
        File file = new File(SAVE_PATH);
        
        if (!file.exists()) {
            file.mkdir();
        }
                
        XLSTransformer transformer = new XLSTransformer();
        
        transformer.transformXLS(source, beansMaps, target);
        
        return target;
    }

Excel 文件下载

public ResponseEntity<byte[]> down(String trueName, String downLoadPath) throws Exception {
        File file = new File(downLoadPath);
        HttpHeaders headers = new HttpHeaders();
        String fileName;
        
        try {
            String userAgent = request.getHeader("User-Agent");
            
            // 判断是否为IE
            if (userAgent.toUpperCase().indexOf("MSIE") > 0 || userAgent.toUpperCase().indexOf("TRIDENT") > 0) {
                fileName = URLEncoder.encode(trueName, "UTF-8");
            } else {
                fileName = new String(trueName.getBytes("UTF-8"), "iso-8859-1");
            }
        } catch (UnsupportedEncodingException e) {
            throw new Exception("文件名转码失败", e);
        } 
        
        // 解决中文名称乱码问题
        headers.setContentDispositionFormData("attachment", fileName);
        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
        
        byte[] bytes;
        
        try {
            bytes = FileUtils.readFileToByteArray(file);
        } catch (IOException e) {
            throw new Exception("读取文件失败", e);
        }
        
        return new ResponseEntity<>(bytes, headers, HttpStatus.OK);
    }

springboot-mail

Spring Boot 整合邮件开发,定时任务。

使用定时任务发送邮件 >_< ~

@Component
public class MailTask {
    
    @Autowired
    private JavaMailSenderImpl mailSender;

    /**
     * second, minute, hour, day, month, week
     * 特殊字符语法:, 枚举, - 区间, * 任意, / 步长, ? 日与星期冲突匹配, L 最后, W 工作日
     * 
     * @throws Exception
     */
    @Scheduled(cron = "0/10 * * * * MON-FRI")
    public void test() throws Exception{
        MimeMessage mimeMessage = mailSender.createMimeMessage();
        MimeMessageHelper mimeMessageHelper = new MimeMessageHelper(mimeMessage, true);

        mimeMessageHelper.setSubject("测试测试测测测");
        mimeMessageHelper.setText("<b style='color:red'>测试测试</b>", true);

        mimeMessageHelper.setTo("[email protected]");
        mimeMessageHelper.setFrom("×××@foxmail.com");

        mimeMessageHelper.addAttachment("1.jpg",
                ResourceUtils.getFile(ResourceUtils.CLASSPATH_URL_PREFIX + "static/images/1.jpg"));

        mailSender.send(mimeMessage);
    }
}

springboot-mybatis

整合了基于注解与配置文件两种方式的 demo,使用阿里开源的数据源 druid,并配置了监控中心。

基于 xml 形式配置数据源

@Configuration
public class DataSourceConfiguration {

    /**
     * 根据配置文件注入数据源属性
     * 比如:用户名,密码,初始化数值,类型等
     * 
     * @return
     */
    @ConfigurationProperties(prefix = "spring.datasource")
    @Bean
    public DataSource druidDataSource() {
        return new DruidDataSource();
    }

    /**
     * 设置 Druid 监控的 Servlet
     * 
     * @return
     */
    @Bean
    public ServletRegistrationBean statViewServlet() {
        ServletRegistrationBean registrationBean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
        Map<String, String> initParams = new HashMap<>(16);
        initParams.put("allow", "");
        initParams.put("loginUsername", "admin");
        initParams.put("loginPassword", "123456");
        registrationBean.setInitParameters(initParams);
        return  registrationBean;
    }

    /**
     * 注册 Druid 监控的 Filter
     * 
     * @return
     */
    @Bean
    public FilterRegistrationBean webStatFilter() {
        FilterRegistrationBean registrationBean = new FilterRegistrationBean(new WebStatFilter());
        Map<String, String> initParams = new HashMap<>(16);
        initParams.put("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid2/*");
        registrationBean.setInitParameters(initParams);
        registrationBean.setUrlPatterns(Arrays.asList("/*"));
        return registrationBean;
    }
    
}

yuml 配置文件

spring:
  datasource:
    username: root
    password: 1234
    url: jdbc:mysql://localhost:3306/ssm_crud
    driver-class-name: com.mysql.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource
    initialSize: 5
    minIdle: 10
    maxActive: 20
    maxWait: 60000
    timeBetweenEvictionRunsMillis: 60000
    minEvictableIdleTimeMillis: 300000
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    filters: stat,wall
    poolPreparedStatements: false
    maxPoolPreparedStatementPerConnectionSize: 20

mybatis:
  config-location: classpath:mybatis/mybatis-config.xml
  mapper-locations: classpath:mybatis/sql-mapper/*.xml

# 在控制台输出 SQL 语句  
logging:
  level:
    com.jas.mapper: debug

springboot-mybatis-plus

Spring Boot 整合 MyBatis Plus 的企业级 demo。

采用前后端分离的方式,在后端使用通用的实体返回 JSON 数据,包括枚举的使用、统一分页请求与响应实体类、自定义异常与异常处理等。

所有的数据库文件都传了上来,可直接在可视化的数据库工具中还原。

数据源与 MyBatis Plus 的配置类,关于数据源的详细配置信息可以在 application.properties 中查看。

@Configuration
@MapperScan(basePackages = {"com.jas.mapper"}, sqlSessionFactoryRef = "sqlSessionFactory")
public class DataSourceConfig {
    
    @Primary
    @Bean(name = "dataSource")
    @ConfigurationProperties(prefix = "datasource")
    public DataSource dataSource() {
        return new DruidDataSource();
    }

    @Primary
    @Bean(name = "transactionManager")
    public DataSourceTransactionManager transactionManager(@Qualifier("dataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

    @Primary
    @Bean(name = "sqlSessionFactory")
    public SqlSessionFactory sqlSessionFactory(@Qualifier("dataSource") DataSource dataSource) throws Exception {
        MybatisSqlSessionFactoryBean factoryBean = new MybatisSqlSessionFactoryBean();
        
        factoryBean.setDataSource(dataSource);
        factoryBean.setMapperLocations(
                new PathMatchingResourcePatternResolver().getResources(ResourceUtils.CLASSPATH_URL_PREFIX 
                        + "com/jas/mapper/*Mapper.xml"));
        factoryBean.setTypeAliasesPackage("com.jas.entity");
        factoryBean.setPlugins(new Interceptor[] { paginationInterceptor(), 
                optimisticLockerInterceptor(), sqlExplainInterceptor(), performanceInterceptor()});
        factoryBean.setGlobalConfig(this.globalConfiguration());

        return factoryBean.getObject();
    }

    /**
     * 乐观锁插件
     * 
     * @return
     */
    public OptimisticLockerInterceptor optimisticLockerInterceptor() {
        return new OptimisticLockerInterceptor();
    }

    /**
     * SQL 分析拦截器,防止恶意删除或更新全表数据
     * 
     * @return
     */
    public SqlExplainInterceptor sqlExplainInterceptor() {
        return new SqlExplainInterceptor();
    }

    /**
     * 分页插件
     * 
     * @return
     */
    public PaginationInterceptor paginationInterceptor() {
        return new PaginationInterceptor();
    }

    /**
     * SQL 执行效率插件
     * 
     * @return
     */
    public PerformanceInterceptor performanceInterceptor() {
        PerformanceInterceptor intrceptor = new PerformanceInterceptor();
        
        intrceptor.setMaxTime(20000);
        intrceptor.setFormat(true);
        
        return intrceptor;
    }

    /**
     * 全局配置,主键策略、驼峰命名、设置逻辑删除
     * 
     * @return
     */
    private GlobalConfiguration globalConfiguration() {
        GlobalConfiguration conf = new GlobalConfiguration(new LogicSqlInjector());
        
        conf.setLogicDeleteValue(BaseLogicDeleteEnum.LogicDelete.getValue());
        conf.setLogicNotDeleteValue(BaseLogicDeleteEnum.LogicNotDelete.getValue());
        conf.setIdType(IdType.AUTO.getKey());
        conf.setDbColumnUnderline(true);
        
        return conf;
    }
}

springboot-sharding-jdbc

springboot 整合 sharding-jdbc 的 demo。

参考:超详细sharding-jdbc分库分表实现(基于spring-boot)

springboot-swagger

Spring Boot 整合 Swagger API 构建工具,提供可视化的 UI 文档界面,便于前后端交互。

Swagger 配置类

@Configuration
@EnableSwagger2
public class SwaggerConfiguration {
    @Bean
    public Docket createRestApi() {
        return new Docket(DocumentationType.SWAGGER_2)
                .apiInfo(apiInfo())
                .select()
                .apis(RequestHandlerSelectors.basePackage("com.jas"))
                .paths(PathSelectors.any())
                .build();
    }

    private ApiInfo apiInfo() {
        return new ApiInfoBuilder()
                .title("swagger构建api文档")
                .description("swaggerTest")
                .termsOfServiceUrl("https://blog.csdn.net/codejas/")
                .version("1.0")
                .build();
    }
}

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