spring 初始小例子

拼搏现实的明天。 2022-07-12 04:42 127阅读 0赞

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  GreetingController package 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 **/