springboot怎么手动动态注入controller和service

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手动动态注入controller和service

package test;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.beans.factory.config.BeanDefinition;import org.springframework.beans.factory.support.BeanDefinitionBuilder;import org.springframework.beans.factory.support.DefaultListableBeanFactory;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.context.ApplicationContext;import org.springframework.context.ConfigurableApplicationContext;import org.springframework.core.io.FileSystemResource;import org.springframework.core.io.FileSystemResourceLoader;import org.springframework.stereotype.Component;import org.springframework.util.ClassUtils;import org.springframework.util.ReflectionUtils;import org.springframework.util.StringUtils;import org.springframework.web.servlet.mvc.method.RequestMappingInfo;import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;import java.io.File;import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import java.net.MalformedURLException;import java.net.URL;import java.net.URLClassLoader;@SpringBootApplication@Componentpublic class ApplicationBootstrap {    static ApplicationContext applicationContext;    static String file = "F:\\download\\apache-maven-3.3.9-bin\\repository\\org\\example\\springboot-test-common\\1.0-SNAPSHOT\\" +            "springboot-test-common-1.0-SNAPSHOT.jar";    public static void main(String[] args) throws Exception {        applicationContext = SpringApplication.run(ApplicationBootstrap.class, args);        String clazzName = "test1.controller.MyTestController1";        String clazzName1 = "test1.service.MyTestServiceImpl";        registerBean(clazzName1);        registerBean(clazzName);        registerController(StringUtils.uncapitalize(clazzName.substring(clazzName.lastIndexOf(".") + 1)));    }    public static void registerBean(String clazzName) throws Exception{        URL url = new File(file).toURI().toURL();//        URLClassLoader loader = (URLClassLoader) ApplicationBootstrap.class.getClassLoader();//        Method add = URLClassLoader.class.getDeclaredMethod("addURL", new Class[] { URL.class });//        add.setAccessible(true);//        add.invoke(loader, url);        URLClassLoader loader = new URLClassLoader(new URL[]{url});//        String clazzName = "test1.controller.MyTestController1";        Class<?> clazz = loader.loadClass(clazzName);//        applicationContext.getClassLoader().loadClass("test.MyController");//        DefaultListableBeanFactory factory = (DefaultListableBeanFactory) applicationContext.getAutowireCapableBeanFactory();        BeanDefinitionBuilder beanDefinitionBuilder = BeanDefinitionBuilder.genericBeanDefinition(clazz);        BeanDefinition beanDefinition = beanDefinitionBuilder.getRawBeanDefinition();        //设置当前bean定义对象是单利的        beanDefinition.setScope("singleton");        //将变量首字母置小写        String beanName = StringUtils.uncapitalize(clazzName);        beanName =  beanName.substring(beanName.lastIndexOf(".")+1);        beanName = StringUtils.uncapitalize(beanName);        //将applicationContext转换为ConfigurableApplicationContext        ConfigurableApplicationContext configurableApplicationContext = (ConfigurableApplicationContext) applicationContext;        // 获取bean工厂并转换为DefaultListableBeanFactory        DefaultListableBeanFactory defaultListableBeanFactory = (DefaultListableBeanFactory) configurableApplicationContext.getBeanFactory();        defaultListableBeanFactory.registerBeanDefinition(beanName, beanDefinition);    }        public static void registerController(String controllerBeanName) throws Exception{        final RequestMappingHandlerMapping requestMappingHandlerMapping=                applicationContext.getBean(RequestMappingHandlerMapping.class);        if(requestMappingHandlerMapping!=null){            String handler=controllerBeanName;            Object controller= applicationContext.getBean(handler);            if(controller==null){                return;            }//            unregisterController(controllerBeanName);            //注册Controller            Method method=requestMappingHandlerMapping.getClass().getSuperclass().getSuperclass().                    getDeclaredMethod("detectHandlerMethods",Object.class);            //将private改为可使用            method.setAccessible(true);            method.invoke(requestMappingHandlerMapping,handler);        }    }        public static void unregisterController(String controllerBeanName){        final RequestMappingHandlerMapping requestMappingHandlerMapping=(RequestMappingHandlerMapping)                applicationContext.getBean("requestMappingHandlerMapping");        if(requestMappingHandlerMapping!=null){            String handler=controllerBeanName;            Object controller= applicationContext.getBean(handler);            if(controller==null){                return;            }            final Class<?> targetClass=controller.getClass();            ReflectionUtils.doWithMethods(targetClass, new ReflectionUtils.MethodCallback() {                public void doWith(Method method) {                    Method specificMethod = ClassUtils.getMostSpecificMethod(method, targetClass);                    try {                        Method createMappingMethod = RequestMappingHandlerMapping.class.                                getDeclaredMethod("getMappingForMethod", Method.class, Class.class);                        createMappingMethod.setAccessible(true);                        RequestMappingInfo requestMappingInfo =(RequestMappingInfo)                                createMappingMethod.invoke(requestMappingHandlerMapping,specificMethod,targetClass);                        if(requestMappingInfo != null) {                            requestMappingHandlerMapping.unregisterMapping(requestMappingInfo);                        }                    }catch (Exception e){                        e.printStackTrace();                    }                }            }, ReflectionUtils.USER_DECLARED_METHODS);        }    }}

在controller中使用参数

说明

控制器中使用参数有很多种方式，直接上代码，在代码注释中进行说明

package com.mzj.springboot.actionpai.controller; import com.mzj.springboot.actionpai.common.User;import org.springframework.web.bind.annotation.*; import javax.servlet.http.HttpServletRequest;import java.util.List; @RestControllerpublic class HelloWorldController3 {     //----------------------方法1、获取路径中的值----------------------------        @GetMapping("/addUser0/{username}")    public String addUser0(@PathVariable String username) {        System.out.println("username : " + username);        return "success0";    }     //----------------------方法2、获取路径中的参数----------------------------        @GetMapping("/addUser1")    public String addUser1(String username) {        System.out.println("username : " + username);        return "success1";    }     //----------------------方法3、通过bean接收HTTP提交的对象----------------------------        @GetMapping("/addUser2")    public String addUser2(User user) {        System.out.println("user ... " + user);        return "success2";    }     //----------------------方法4、通过HttpServletRequest接收参数----------------------------        @GetMapping("/addUser3")    public String addUser3(HttpServletRequest request) {        System.out.println("username ... " + request.getParameter("username"));        return "success3";    }     //----------------------方法5、用@RequestParam绑定入参----------------------------        @GetMapping("/addUser4")    public String addUser4(@RequestParam String username) {        System.out.println("username : " + username);        return "success4";    }     //----------------------方法6、用@RequestBody接收JSON数据----------------------------        @PostMapping("/addUser5")    public String addUser5(@RequestBody List<User> userList) {        System.out.println("userList : " + userList);        return "success5";    }     //----------------------方法7、用@ModelAttribute注解获取参数----------------------------        @PostMapping("/addUser6")    public String addUser6(@ModelAttribute("user") User user) {        System.out.println("user ... " + user);        return "success6";    }         @PostMapping("/addUser7")    public String addUser7(@ModelAttribute("user") User user) {        System.out.println("user7 ... " + user);        return "success7";    }    @ModelAttribute("user")    public User addAccount() {        return new User("jz", 55);    } }

除了上面的方式外，还有：上传文件MultipartFile、上传图片，这里省略。

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