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这篇文章主要介绍“springboot怎么手动动态注入controller和service”的相关知识，小编通过实际案例向大家展示操作过程，操作方法简单快捷，实用性强，希望这篇“springboot怎么手动动态注入controller和service”文章能帮助大家解决问题。
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
@Component
public 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);
}
}
}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;
@RestController
public 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
* <p>
* 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"
* }
* ]
* <p>
* 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<User> 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
* <p>
* 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
* <p>
* 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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