2024-09-06

这个问题的解决方案取决于你想在哪种环境下运行这个命令。这是一个UNIX或Linux shell命令,用于在命令行中查找包含"tomcat"的进程。

如果你在本地计算机上运行,并且你有UNIX或Linux shell的访问权限,你可以直接在你的终端或控制台中运行这个命令。

如果你想在一个程序中运行这个命令,你需要使用你使用的编程语言的相应进程管理功能。

例如,在Python中,你可以使用subprocess模块来运行这个命令:




import subprocess
 
def check_tomcat_process():
    try:
        output = subprocess.check_output('ps -ef | grep tomcat', shell=True)
        if "tomcat" in output.decode():
            print("Tomcat process is running.")
        else:
            print("Tomcat process is not running.")
    except subprocess.CalledProcessError as e:
        print("Tomcat process is not running.")
 
check_tomcat_process()

在Java中,你可以使用Runtime类来运行这个命令:




public class CheckTomcatProcess {
    public static void main(String[] args) {
        try {
            Process p = Runtime.getRuntime().exec(new String[]{"/bin/sh", "-c", "ps -ef | grep tomcat"});
            p.waitFor();
            java.io.InputStream in = p.getInputStream();
            byte[] re = new byte[1024];
            while (in.read(re) != -1) {
                System.out.print(new String(re));
            }
            if (new String(re).contains("tomcat")) {
                System.out.println("Tomcat process is running.");
            } else {
                System.out.println("Tomcat process is not running.");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

在JavaScript中,你可以使用Node.js的child\_process模块来运行这个命令:




const { exec } = require('child_process');
 
exec('ps -ef | grep tomcat', (err, stdout, stderr) => {
    if (err) {
        console.error(err);
        return;
    }
    console.log(stdout);
    if (stdout.includes("tomcat")) {
        console.log("Tomcat process is running.");
    } else {
        console.log("Tomcat process is not running.");
    }
});

在C#中,你可以使用System.Diagnostics.Process类来运行这个命令:




using System;
using System.Diagnostics;
 
public class CheckTomcatProcess {
    public static void Main() {
        Process process = new Process();
        process.StartInfo.FileName = "/bin/sh";
        process.StartInfo.Arguments = "-c ps -ef | grep tomcat";
        process.StartInfo.UseShellExecute = false;
        process.StartInfo.RedirectStandardOutput = true;
        process.Start();
        string output = process.StandardOutput
2024-09-06

Spring Cloud Stream 整合 RocketMQ 的基本步骤如下:

  1. 在项目的pom.xml中添加Spring Cloud Stream和RocketMQ Binder的依赖:



<dependencies>
    <!-- Spring Cloud Stream -->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-stream-rocketmq</artifactId>
    </dependency>
    <!-- 其他依赖 -->
</dependencies>
  1. 在application.yml或application.properties中配置RocketMQ的连接信息:



spring:
  cloud:
    stream:
      rocketmq:
        binder:
          namesrv-addr: 127.0.0.1:9876 # RocketMQ NameServer地址
      bindings:
        output:
          destination: test-topic # 指定发送到的topic
          content-type: text/plain # 设置消息类型
        input:
          destination: test-topic # 指定订阅的topic
          content-type: text/plain # 设置消息类型
          group: test-group # 设置消费组
  1. 创建发送和接收消息的服务类:



@EnableBinding(value = {Processor.class})
public class RocketMQService {
 
    @Autowired
    private MessageChannel output;
 
    public void send(String content) {
        output.send(MessageBuilder.withPayload(content).build());
    }
 
    @StreamListener(Processor.INPUT)
    public void receive(String payload) {
        System.out.println("Received: " + payload);
    }
}

在上述代码中,@EnableBinding(Processor.class)注解启用了Spring Cloud Stream的Processor绑定,这允许我们发送和接收消息。send方法用于发送消息,receive方法用@StreamListener注解标记,以接收消息。

确保RocketMQ的服务器正在运行并可以正常访问,然后就可以通过调用send方法发送消息,并在接收端打印出接收到的消息内容。

2024-09-06

在Linux环境下搭建Java Web服务器Tomcat,并部署多个实例,可以按照以下步骤进行:

  1. 安装Java JDK



sudo apt-update
sudo apt install default-jdk
  1. 验证Java安装



java -version
  1. 下载Tomcat



wget https://dlcdn.apache.org/tomcat/tomcat-9/v9.0.65/bin/apache-tomcat-9.0.65.tar.gz
  1. 解压Tomcat



tar -xvzf apache-tomcat-9.0.65.tar.gz
  1. 多实例部署
  • 复制Tomcat目录,创建多个实例



cp -R apache-tomcat-9.0.65 /usr/local/tomcat9-instance1
cp -R apache-tomcat-9.0.65 /usr/local/tomcat9-instance2
  • 修改每个实例的端口号,防止冲突

    修改/usr/local/tomcat9-instance1/conf/server.xml中的端口号:




<Connector port="8080" protocol="HTTP/1.1" ... />
<Connector port="8009" protocol="AJP/1.3" ... />

修改/usr/local/tomcat9-instance2/conf/server.xml中的端口号,例如将HTTP端口改为8081:




<Connector port="8081" protocol="HTTP/1.1" ... />

并调整其他相关端口号,确保它们不会和其他实例或系统服务冲突。

  1. 启动Tomcat实例



/usr/local/tomcat9-instance1/bin/startup.sh
/usr/local/tomcat9-instance2/bin/startup.sh
  1. 检查Tomcat实例是否启动



ps aux | grep tomcat
  1. 配置防火墙(如果需要)



sudo ufw allow 8080/tcp
sudo ufw allow 8081/tcp
  1. 通过浏览器访问



http://<服务器IP>:8080
http://<服务器IP>:8081

以上步骤中,每个实例的端口号应该被修改以避免冲突。这样,你就可以在同一台Linux服务器上运行多个Tomcat实例了。

2024-09-06

以下是一个简化的示例,展示了如何在Spring Boot应用中对接支付宝完整的扫码支付流程:




@Configuration
public class AlipayConfig {
    @Value("${alipay.appId}")
    private String appId;
 
    @Value("${alipay.privateKey}")
    private String privateKey;
 
    @Value("${alipay.publicKey}")
    private String publicKey;
 
    @Value("${alipay.serverUrl}")
    private String serverUrl;
 
    @Value("${alipay.domain}")
    private String domain;
 
    // 提供获取配置属性的方法
    public String getAppId() {
        return appId;
    }
 
    // ... 其他配置属性的获取方法
}
 
@Service
public class AlipayService {
    @Autowired
    private AlipayConfig alipayConfig;
 
    public String startPay(String orderId, String totalAmount) throws AlipayApiException {
        AlipayTradePrecreateRequest request = new AlipayTradePrecreateRequest();
        // 设置商户订单信息
        JSONObject bizContent = new JSONObject();
        bizContent.put("out_trade_no", orderId);
        bizContent.put("total_amount", totalAmount);
        bizContent.put("subject", "商品标题");
        // ... 设置其他必要的参数
        request.setBizContent(bizContent.toString());
        // 使用SDK执行请求
        AlipayTradePrecreateResponse response = alipayClient.execute(request);
        if(response.isSuccess()){
            return response.getQrCode(); // 返回二维码图片的地址
        } else {
            // 处理错误
        }
    }
 
    // ... 其他支付相关的方法
}
 
@RestController
public class AlipayController {
    @Autowired
    private AlipayService alipayService;
 
    @GetMapping("/pay")
    public String startPay(@RequestParam("orderId") String orderId,
                           @RequestParam("totalAmount") String totalAmount) {
        try {
            return alipayService.startPay(orderId, totalAmount);
        } catch (AlipayApiException e) {
            // 异常处理
        }
    }
 
    // ... 其他接口方法
}

以上代码提供了一个简化的示例,展示了如何在Spring Boot应用中集成支付宝支付SDK,并实现扫码支付的基本流程。在实际应用中,你需要处理更多的细节,例如异常处理、安全性考虑(如参数签名验证)、日志记录、事务管理等。

2024-09-06

由于原始代码较为复杂且涉及到火车票订票的具体业务逻辑,我们将提供核心的Spring Boot应用配置和服务层的简化示例。




// 火车票服务接口
public interface TicketService {
    Order queryOrder(String orderId);
    boolean isTicketLeft(String trainNumber, String from, String to);
    Order purchaseTicket(String trainNumber, String from, String to);
}
 
// 火车票服务实现
@Service
public class TicketServiceImpl implements TicketService {
 
    @Autowired
    private OrderRepository orderRepository;
 
    @Autowired
    private RestTemplate restTemplate;
 
    @Override
    public Order queryOrder(String orderId) {
        return orderRepository.findById(orderId).orElse(null);
    }
 
    @Override
    public boolean isTicketLeft(String trainNumber, String from, String to) {
        String url = "http://ts.sdo.com/train/left_ticket/?train_date=2023-03-01&station_train_code=" + trainNumber + "&from_station=" + from + "&to_station=" + to;
        String response = restTemplate.getForObject(url, String.class);
        // 根据响应结果判断是否有票
        return !"无".equals(response);
    }
 
    @Override
    public Order purchaseTicket(String trainNumber, String from, String to) {
        // 模拟下单操作
        Order order = new Order();
        order.setOrderId(UUID.randomUUID().toString());
        order.setTrainNumber(trainNumber);
        order.setFrom(from);
        order.setTo(to);
        orderRepository.save(order);
        return order;
    }
}
 
// 实体类Order
@Entity
public class Order {
    @Id
    private String orderId;
    private String trainNumber;
    private String from;
    private String to;
    // 省略getter和setter
}
 
// 仓库接口OrderRepository
public interface OrderRepository extends JpaRepository<Order, String> {
}
 
// 控制器类TicketController
@RestController
public class TicketController {
 
    @Autowired
    private TicketService ticketService;
 
    @GetMapping("/query_order")
    public Order queryOrder(@RequestParam String orderId) {
        return ticketService.queryOrder(orderId);
    }
 
    @GetMapping("/is_ticket_left")
    public boolean isTicketLeft(@RequestParam String trainNumber, @RequestParam String from, @RequestParam String to) {
2024-09-06

在Spring Boot中,可以通过以下四种方式注册Servlet:

  1. 继承SpringBootServletInitializer类
  2. 使用ServletRegistrationBean注册
  3. 使用ServletComponentRegister注册
  4. 使用@WebServlet注解注册

下面是这四种方式的示例代码:

  1. 继承SpringBootServletInitializer类



public class MyServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().write("Hello, world");
    }
}
 
public class ServletInitializer extends SpringBootServletInitializer {
    @Override
    protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
        return application.sources(ServletInitializer.class);
    }
 
    @Bean
    public ServletRegistrationBean myServlet() {
        return new ServletRegistrationBean(new MyServlet(), "/myServlet");
    }
}
  1. 使用ServletRegistrationBean注册



public class MyServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().write("Hello, world");
    }
}
 
@Configuration
public class ServletConfig {
    @Bean
    public ServletRegistrationBean myServlet() {
        return new ServletRegistrationBean(new MyServlet(), "/myServlet");
    }
}
  1. 使用@WebServlet注解注册



@WebServlet(name = "myServlet", urlPatterns = "/myServlet")
public class MyServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().write("Hello, world");
    }
}
  1. 使用ServletComponentRegister注册



@WebServlet(name = "myServlet", urlPatterns = "/myServlet")
public class MyServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.getWriter().write("Hello, world");
    }
}
 
@Configuration
public class ServletConfig implements WebServletRegistry {
    @Override
    public void registerServlet(ServletRegistrationBean servletRegistrationBean) {
        servletRegistrationBean.setServlet(new MyServlet());
        servletRegistrationBean.addUrlMappings("/myServlet");
    }
}

以上四种方式均可以在Spring Boot应用中注册Servlet,具体使用哪一种取决于具体的应用场景和需求。

2024-09-06

以下是一个基于Jenkins的自动构建和部署的示例流程,使用Maven, GitLab和Tomcat:

  1. 安装配置Jenkins。
  2. 在Jenkins中安装必要的插件,如Maven插件、GitLab插件、Deploy to Container Plugin等。
  3. 配置全局设置,如Maven配置、GitLab认证信息等。
  4. 创建一个新的Jenkins项目,并配置:

    • 源码管理:选择Git,并配置GitLab仓库地址和认证信息。
    • 构建触发器:配置为当向GitLab仓库推送代码时自动构建。
    • 构建环境:配置环境变量,如Maven的设置文件。
    • 构建:Goals and options中配置Maven命令,如clean install
    • 后置构建操作:配置Deploy to Container,设置Tomcat的用户名、密码、应用上下文、包的URL和本地路径。

以下是一个简化的Jenkins Job配置示例:




// Jenkinsfile
pipeline {
    agent any
    stages {
        stage('Build') {
            steps {
                // 获取代码
                git 'git@gitlab.com:username/project.git'
                // 执行Maven构建
                sh 'mvn clean install'
            }
        }
        stage('Deploy') {
            steps {
                // 部署到Tomcat
                deploy war: 'target/project.war',
                        context: 'project',
                        container: 'tomcat8.example.com'
            }
        }
    }
    // 其他配置...
}

确保Jenkins具有对Tomcat和GitLab仓库的访问权限,并且Deploy to Container插件已正确配置。这样,当代码被推送到GitLab后,Jenkins将自动执行构建并将应用部署到Tomcat容器中。

2024-09-06

Spring Boot整合Shiro主要有两种方式:

  1. 使用Shiro Spring Boot Starter
  2. 手动配置

1. 使用Shiro Spring Boot Starter

首先,添加依赖到你的pom.xml




<dependency>
    <groupId>org.apache.shiro</groupId>
    <artifactId>shiro-spring-boot-starter</artifactId>
    <version>版本号</version>
</dependency>

然后,在application.propertiesapplication.yml中配置Shiro:




# 配置Shiro
shiro.sessionManager.globalSessionTimeout = 800000
shiro.unauthorizedUrl = /unauthorized
shiro.user.cookie = user
shiro.user.cookie.maxAge = 3600
shiro.user.cookie.path = /

2. 手动配置

在Spring Boot的配置类中添加Shiro配置:




@Configuration
public class ShiroConfig {
 
    @Bean
    public Realm realm() {
        // 配置你的Realm
        return new YourRealm();
    }
 
    @Bean
    public DefaultWebSecurityManager securityManager() {
        DefaultWebSecurityManager manager = new DefaultWebSecurityManager();
        manager.setRealm(realm());
        // 配置其他组件
        return manager;
    }
 
    @Bean
    public ShiroFilterFactoryBean shiroFilterFactoryBean(DefaultWebSecurityManager securityManager) {
        ShiroFilterFactoryBean factoryBean = new ShiroFilterFactoryBean();
        factoryBean.setSecurityManager(securityManager);
        // 配置过滤链
        return factoryBean;
    }
}

application.propertiesapplication.yml中配置Shiro:




# 配置Shiro
shiro.sessionManager.globalSessionTimeout = 800000
shiro.unauthorizedUrl = /unauthorized
shiro.user.cookie = user
shiro.user.cookie.maxAge = 3600
shiro.user.cookie.path = /

以上两种方式均可以整合Shiro到Spring Boot项目中,具体使用哪一种取决于你的项目需求和偏好。

2024-09-06

以下是一个简化的Spring Cloud Gateway配合JWT实现鉴权的示例:

  1. 添加依赖(pom.xml):



<dependencies>
    <!-- Spring Cloud Gateway -->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-gateway</artifactId>
    </dependency>
    <!-- Spring Cloud Gateway Filter for JWT -->
    <dependency>
        <groupId>com.marcosbarbero.cloud</groupId>
        <artifactId>spring-cloud-gateway-core-filter-jwt-rewrite</artifactId>
        <version>2.2.1.RELEASE</version>
    </dependency>
    <!-- JWT -->
    <dependency>
        <groupId>io.jsonwebtoken</groupId>
        <artifactId>jjwt</artifactId>
        <version>0.9.1</version>
    </dependency>
</dependencies>
  1. 配置文件(application.yml):



spring:
  cloud:
    gateway:
      routes:
        - id: service-id
          uri: http://localhost:8080
          predicates:
            - Path=/service/**
          filters:
            - StripPrefix=1
            - name: JwtRequestWrapperFilter
            - name: JwtDecodeFilter
              args:
                public-key: "your_public_key"
                token-is-optional: false
  1. 配置JWT过滤器(FilterConfig.java):



@Configuration
public class FilterConfig {
 
    @Bean
    public JwtFilter jwtFilter() {
        return new JwtFilter("your_public_key");
    }
}
  1. JWT过滤器实现(JwtFilter.java):



public class JwtFilter implements GatewayFilter, Ordered {
    private String publicKey;
 
    public JwtFilter(String publicKey) {
        this.publicKey = publicKey;
    }
 
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        String token = exchange.getRequest().getHeaders().getFi
2024-09-06

在Spring Cloud Gateway中,跨域问题通常是由于浏览器的同源策略导致的,它阻止了来自不同源(域名、协议或端口)的Web页面请求访问另一个源的资源。Spring Cloud Gateway提供了一个全局过滤器来解决跨域问题。

解决方案:

  1. 添加全局跨域过滤器:



@Bean
public RouteLocator customRouteLocator(RouteLocatorBuilder builder) {
    return builder.routes()
            .route("cross-origin", r -> r.order(0)
                    .filter(exposeHeadersGatewayFilterFactory.apply(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN))
                    .uri("http://localhost:8080/")
                    .id("cross_origin_route")
            )
            .build();
}
  1. 配置跨域过滤器:



spring:
  cloud:
    gateway:
      globalcors:
        add-to-simple-url-handler-mapping: true
        corsConfigurations:
          '[/**]':
            allowedOrigins: "*"
            allowedMethods:
            - GET
            - POST
            - DELETE
            - PUT
            - OPTIONS

在上述配置中,add-to-simple-url-handler-mapping 属性设置为 true 表示启用简单URL的处理映射,allowedOrigins 属性设置为 "*" 表示允许所有域进行跨域请求。

注意:在生产环境中,应该将 allowedOrigins 设置为特定的域,以保证安全。