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); } /** * 注册Controller * @param controllerBeanName * @throws Exception */ 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); } } /** * 去掉Controller的Mapping * @param controllerBeanName */ 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---------------------------- /** * URL：http://localhost:8081/addUser0/MAZHONGJIA * * @param username * @return */ @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---------------------------- /** * URL：http://localhost:8081/addUser1?username=mazhongjia * * @param username * @return */ @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---------------------------- /** * URL：http://localhost:8081/addUser2?username=mazhongjia&age=33 * * @param user * @return */ @GetMapping("/addUser2") public String addUser2(User user) { System.out.println("user ... " + user); return "success2"; } //----------------------方法4、通过HttpServletRequest接收参数---------------------------- /** * URL：http://localhost:8081/addUser3?username=mazhongjia * * @param request * @return */ @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---------------------------- /** * 通过@RequestParam注解绑定入参 * * URL：http://localhost:8081/addUser1?username=mazhongjia * * @param username * @return */ @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---------------------------- /** * URL：http://localhost:8081/addUser5 * BODY： * [ * { * "username": "mazhongjia", * "age": "35" * }, * { * "username": "huan", * "age": "31" * } * ] *
* 通过@RequestBody接收JSON入参，同时需要设置http的header中Content-Type属性值为【application/json;charset=UTF-8】 * * @param userList * @return */ @PostMapping("/addUser5") public String addUser5(@RequestBody List userList) { System.out.println("userList : " + userList); return "success5"; } //----------------------方法7、用@ModelAttribute注解获取参数---------------------------- /** * URL：http://localhost:8081/addUser6?username=mazhong&age=35 * * 通过@ModelAttribute注解，从Model、Form或者URL请求参数中获取属性值，上面的URL演示从URL参数中取值 * * @param user * @return */ @PostMapping("/addUser6") public String addUser6(@ModelAttribute("user") User user) { System.out.println("user ... " + user); return "success6"; } /** * URL：http://localhost:8081/addUser7 *
* 通过@ModelAttribute注解，从Model、Form或者URL请求参数中获取属性值，上面的URL演示从Model中取值 * * @param user * @return */ @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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