springboot手动动态注入controller和service方式

springboot手动动态注入controller和service方式

目录手动动态注入controller和service在controller中使用参数说明

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

@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);

}

}

}

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;

@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

*

* 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://localhoiUnNbrlgst: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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