spring 初始小例子

最新推荐文章于 2025-08-10 11:14:23 发布

原创最新推荐文章于 2025-08-10 11:14:23 发布 · 200 阅读

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本文介绍了一个使用Spring MVC框架构建的简单Web应用示例。该应用通过Gradle进行构建，并利用Tomcat作为部署容器。主要组件包括配置类、控制器及实体对象等。

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1. gradle 文件

apply plugin: 'java'
apply plugin: 'war'   //用于打war包

jar {
    baseName = 'gs-rest-service'
    version = '0.1.0'
}

repositories {
    mavenCentral()
    //  maven { url "http://repo.spring.io/release" }

}

sourceCompatibility = 1.7
targetCompatibility = 1.7

dependencies {
//    compile("org.springframework.boot:spring-boot-starter-web")
//    testCompile('org.springframework.boot:spring-boot-starter-test')
//    testCompile('com.jayway.jsonpath:json-path')
    compile("org.springframework:spring-context:4.3.6.RELEASE")
    compile("org.springframework:spring-web:4.3.6.RELEASE")
    compile("org.apache.tomcat:tomcat-servlet-api:8.0.24")
    compile("org.springframework:spring-web:4.3.6.RELEASE")
    compile("org.springframework:spring-webmvc:4.3.6.RELEASE")
    compile("com.fasterxml.jackson.core:jackson-databind:2.8.6")
    compile("com.fasterxml.jackson.core:jackson-annotations:2.8.6")
    compile("com.fasterxml.jackson.core:jackson-core:2.8.6")
//    testCompile('org.springframework.boot:spring-boot-starter-test')
    testCompile("org.springframework:spring-test:4.3.6.RELEASE")

    //compile("org.springframework:spring-context:5.0.0.M1")


}

服务启动初始化：MyWebApplicationInitializer

package hello;

import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;


public class MyWebApplicationInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {

    @Override
    protected Class<?>[] getRootConfigClasses() {
        return null;
    }

    @Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class[]{WebConfig.class};
    }

    @Override
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }


}
web配置：WebConfig

/**
*用于加载注解标识的类，如controller，否则无法实例化注解的bean，导致问题出现，如请求无法映射到controller
**/
@Configuration
@EnableWebMvc
@ComponentScan(basePackages = {"hello"})
public class WebConfig extends WebMvcConfigurerAdapter {
    @Override
    public void configureViewResolvers(ViewResolverRegistry registry) {
        registry.enableContentNegotiation(new MappingJackson2JsonView());
        registry.jsp();
    }

}

控制器  GreetingControllerpackage hello;

import java.util.concurrent.atomic.AtomicLong;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class GreetingController {

    private static final String template = "Hello, %s!";
    private final AtomicLong counter = new AtomicLong();

    @RequestMapping("/greeting")
    public Greeting greeting(@RequestParam(value="name", defaultValue="World") String name) {
        return new Greeting(counter.incrementAndGet(),
                            String.format(template, name));
    }
}
实体对象 Greeting

package hello;

public class Greeting {

    private final long id;
    private final String content;

    public Greeting(long id, String content) {
        this.id = id;
        this.content = content;
    }

    public long getId() {
        return id;
    }

    public String getContent() {
        return content;
    }
}

/**
*用于加载注解标识的类，如controller，否则无法实例化注解的bean，导致问题出现，如请求无法映射到controller
**/