如何在不使用 Eclipse 的情况下在 spring 和 maven 中运行 HelloWorld 程序答案

【问题标题】：How to run HelloWorld program in spring and maven without using Eclipse如何在不使用 Eclipse 的情况下在 spring 和 maven 中运行 HelloWorld 程序
【发布时间】：2013-11-20 11:22:11
【问题描述】：

我刚刚开始学习 spring，我正在尝试使用 maven 但没有 eclipse 来执行示例 HelloWorld 程序。

我使用 maven 构建成功，但我无法运行该项目。

有人可以帮帮我吗？

HelloWorld.java

package com.tutorialspoint;

public class HelloWorld {
   private String message;

   public void setMessage(String message){
      this.message  = message;
   }

   public void getMessage(){
      System.out.println("Your Message : " + message);
   }
}

MainApp.java

package com.tutorialspoint;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class MainApp {
   public static void main(String[] args) {
      ApplicationContext context = new ClassPathXmlApplicationContext("Beans.xml");
      HelloWorld obj = (HelloWorld) context.getBean("helloWorld");

      obj.getMessage();
   }
}

Beans.xml

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

   <bean id="helloWorld" class="com.tutorialspoint.HelloWorld">
       <property name="message" value="Hello World!"/>
   </bean>

</beans>

POM.xml

<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/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.tutorialspoint</groupId>
  <artifactId>HelloSpring</artifactId>
  <packaging>jar</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>HelloSpring</name>
  <url>http://maven.apache.org</url>
  <dependencies>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>3.2.5.RELEASE</version>
    </dependency>

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>3.2.5.RELEASE</version>
    </dependency>

  </dependencies>
</project>

错误

Exception in thread "main" java.lang.NoSuchMethodError: main

【问题讨论】：

你究竟想如何运行这个项目？
cd 目标\ java -cp HelloSpring-1.0-SNAPSHOT.jar com.tutorialspoint.HelloWorld
你的班级是MainApp，而不是HelloWorld
但是没有生成 MainApp 类
@Govan：？？？您的示例中有一个 MainApp？！

标签： java spring maven spring-mvc

【解决方案1】：

你需要在 pom 配置中指定一个入口点。

<plugin>
  <groupId>org.apache.maven.plugins</groupId>
  <artifactId>maven-jar-plugin</artifactId>
  <version>2.4</version>
  <configuration>
    <archive>
        <manifest>
            <mainClass>com.path_to_main_class</mainClass>
        </manifest>
    </archive>
  </configuration>
</plugin>

教程在这里 How to create a jar file with Maven

【讨论】：

添加后我得到以下信息：格式错误的 POM /home/elangovan/Documents/HelloSpring/pom.xml: Unrecognized tag: 'plugin' (position: START_TAG seen ...@987654322 @>\n ...@10:11) @ /home/elangovan/Documents/HelloSpring/pom.xml，第 10 行，第 11 列 -> [帮助 2]
将<plugin> 放入<plugins> 部分
@MariuszS 我错过了构建标签。谢谢。

【解决方案2】：

使用 Spring 的程序可以像其他 java 程序一样启动。

java -cp <your classpath>  com.tutorialspoint.HelloWorld

通常类路径包含许多库：Spring、hibernate、jdbc 驱动程序和许多其他库。为了避免长类路径，我使用带有依赖项的 jar。在这种情况下，您的命令行非常简单：

java -jar MyApp-1.0-SNAPSHOT.jar

pom.xml：

<?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>
    <groupId>mygroupid</groupId>
    <artifactId>myappid</artifactId>
    <packaging>jar</packaging>
    <version>1.0-SNAPSHOT</version>
    <name>MyApp</name>
    <url>http://maven.apache.org</url>

    <dependencies>
        <!-- Your dependencies -->
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>2.0.2</version>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                </configuration>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-assembly-plugin</artifactId>
                <version>2.2.1</version>
                <executions>
                    <execution>
                        <id>package-jar-with-dependencies</id>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                        <configuration>
                            <appendAssemblyId>false</appendAssemblyId>
                            <descriptorRefs>
                                <descriptorRef>jar-with-dependencies</descriptorRef>
                            </descriptorRefs>
                            <archive>
                                <manifest>
                                    <mainClass>com.tutorialspoint.MainApp</mainClass>
                                </manifest>
                            </archive>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <version>2.1</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                        <configuration>
                            <filters>
                                <filter>
                                    <artifact>junit:junit</artifact>
                                    <includes>
                                        <include>junit/framework/**</include>
                                        <include>org/junit/**</include>
                                    </includes>
                                    <excludes>
                                        <exclude>org/junit/experimental/**</exclude>
                                        <exclude>org/junit/runners/**</exclude>
                                    </excludes>
                                </filter>
                                <filter>
                                    <artifact>*:*</artifact>
                                    <excludes>
                                        <exclude>META-INF/*.SF</exclude>
                                        <exclude>META-INF/*.DSA</exclude>
                                        <exclude>META-INF/*.RSA</exclude>
                                    </excludes>
                                </filter>
                            </filters>
                            <transformers>
                                <transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                                    <resource>META-INF/spring.handlers</resource>
                                </transformer>
                                <transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                                    <resource>META-INF/spring.schemas</resource>
                                </transformer>
                                <transformer implementation="org.apache.maven.plugins.shade.resource.PluginXmlResourceTransformer"/>
                            </transformers>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

【讨论】：