Atitit mvc框架的实现 mvc的原理demo v2 sbb.docx 目录 1. 原理流程， 1 1.1. 项目启动的时候启动mvc框架扫描，建立url 方法对应表 1 1.2. 执行ur

Atitit  mvc框架的实现 mvc的原理demo v2 sbb.docx

 

目录

1. 原理流程， 1

1.1. 项目启动的时候启动mvc框架扫描，建立url 方法对应表 1

1.2. 执行url的时候，执行webfilter，获取的对应method 1

1.3. 使用反射ai调用方法输出 2

2. code 2

2.1. class MvcCtrol { 2

2.2. MvcFilter 2

2.3. MvcUtil 5

 

/springbootUpload/src/mvcpkg/MvcCtrol.java

http://localhost:8080/mvctest

 

1. 原理流程，
   1. 项目启动的时候启动mvc框架扫描，建立url 方法对应表

public class Application {

 

public static void main(String[] args) {

 

 //boot mvc framwork

MvcUtil.get_url_method_mapper(MvcCtrol.class);

 

1. 1. 执行url的时候，执行webfilter，获取的对应method

Method meth =MvcUtil. url_method_maps.get(uri);  

 

Class<? > class1 = meth.getDeclaringClass();

Object  classObj = ConstructorUtils.invokeConstructor(class1, null);

Object[] args =MvcUtil.getArgs(meth,httpServletRequest,httpServletResponse); //new Object[] {};

String r = (String) meth.invoke(classObj, args);

 

1. 1. 使用反射ai调用方法输出

 

1. code
   1. class MvcCtrol {

@MyComponent

public class MvcCtrol {

    //  http://localhost:8080/mvctest

@MyMapping("/mvctest")

public String mvctestMeth(HttpServletRequest req) {

 

return "data";

}

 

}

1. 1. MvcFilter 

 

 

package mvcpkg;

 

import java.io.File;

import java.io.IOException;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

import java.lang.reflect.Parameter;

import java.util.List;

import java.util.Map;

import java.util.function.Consumer;

 

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletOutputStream;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

import javax.servlet.annotation.WebFilter;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.swing.text.html.HTMLDocument.HTMLReader.IsindexAction;

 

import org.apache.commons.io.FileUtils;

import org.apache.commons.lang3.ObjectUtils;

import org.apache.commons.lang3.reflect.ConstructorUtils;

import org.springframework.stereotype.Component;

 

import com.google.common.base.Objects;

import com.google.common.collect.Lists;

import com.google.common.collect.Maps;

 

@Component

@WebFilter(urlPatterns = "/*", filterName = "mvcFilter")

public class MvcFilter implements Filter {

 

@Override

public void destroy() {

// TODO Auto-generated method stub

 

}

 

@Override

public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2) {

try {

 

// get url out mapper

   // Map<String, Method> url_method_maps = MvcUtil.get_url_out_mapper();

 

HttpServletRequest httpServletRequest = (HttpServletRequest) arg0;

HttpServletResponse httpServletResponse = (HttpServletResponse) arg1;

String uri = httpServletRequest.getRequestURI();

System.out.println(uri);

 

 if(MvcUtil.url_method_maps.get(uri)==null)

 {

arg2.doFilter(arg0, arg1);

return;

 }

 

 

Method meth =MvcUtil. url_method_maps.get(uri);  

 

Class<? > class1 = meth.getDeclaringClass();

Object  classObj = ConstructorUtils.invokeConstructor(class1, null);

Object[] args =MvcUtil.getArgs(meth,httpServletRequest,httpServletResponse); //new Object[] {};

String r = (String) meth.invoke(classObj, args);

outputHtml(httpServletResponse, r);

return;  //not to next ,beirs springmvc show err,cause cant this mappering  

// arg2.doFilter(arg0, arg1);

 

} catch (Exception e) {

    throw new RuntimeException(e);

}

}

 

 

 

// private List getMycomponentClassList() {

// List li_allclass=Lists.newArrayList();

// li_allclass.add(MvcCtrol.class);

//

// List li= Lists.newArrayList();

// classList.add();

//

// }

 

private void outputHtml(HttpServletResponse httpServletResponse, String txt) throws IOException {

byte[] s = txt.getBytes();

ServletOutputStream outputStream = httpServletResponse.getOutputStream();

outputStream.write(s);

  outputStream.flush();

}

 

@Override

public void init(FilterConfig arg0) throws ServletException {

// TODO Auto-generated method stub

 

}

 

}

 

1. 1. MvcUtil 

 

  package mvcpkg;

 

import java.lang.reflect.Method;

import java.lang.reflect.Parameter;

import java.util.List;

import java.util.Map;

import java.util.function.Consumer;

 

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

import javax.servlet.http.HttpServletRequest;

 

import com.google.common.collect.Lists;

import com.google.common.collect.Maps;

 

public class MvcUtil {

 

 

 

 

public static  Map<String, Method> url_method_maps = Maps.newLinkedHashMap();

public static  Map<String, Method> get_url_method_mapper(Class class1) {

// MyComponent MyComponentAnno = (MyComponent) class1.getAnnotation(MyComponent.class);

// if (MyComponentAnno == null)

// return;

 

// 获取一个类的注解，根据注解名

Method[] methds = class1.getMethods();

for (Method method : methds) {

MyMapping anno1 = (MyMapping) method.getAnnotation(MyMapping.class);

if (anno1 == null)

continue;

 

String uri_mapping = anno1.value();  

url_method_maps.put(uri_mapping, method);

}

return url_method_maps;

}

 

public static Object[] getArgs(Method meth, ServletRequest arg0, ServletResponse arg1) {

List li=Lists.newArrayList();

Parameter[] Parameters_arr= meth.getParameters();

for (Parameter parameter : Parameters_arr) {

Class<?> type1 = parameter.getType();

if  (  type1 ==HttpServletRequest.class)

{

li.add(arg0);

}

}

return li.toArray();

}

 

private static void ClassListForeach(Consumer<Class<?>> consumer) {

List<Class<?>> li_allclass = Lists.newArrayList();

li_allclass.add(MvcCtrol.class);

for (Class class1 : li_allclass) {

consumer.accept(class1);

}

 

}

 

 

// public static  Map<String, MethodObj> get_url_out_mapper() {

// Map<String, MethodObj> url_method_maps = Maps.newLinkedHashMap();

// ClassListForeach(new Consumer<Class<?>>() {

//

// @Override

// public void accept(Class<?> cls) {

//

// MyComponent MyComponentAnno = (MyComponent) cls.getAnnotation(MyComponent.class);

// if (MyComponentAnno == null)

// return;

//

// // 获取一个类的注解，根据注解名

// Method[] methds = cls.getMethods();

// for (Method method : methds) {

// MyMapping anno1 = (MyMapping) method.getAnnotation(MyMapping.class);

// if (anno1 == null)

// continue;

//  

// String uri_mapping = anno1.value();

// MethodObj MethodObj1 = new MethodObj();

// MethodObj1.classProp = cls;

// MethodObj1.methodProp = method;

// url_method_maps.put(uri_mapping, MethodObj1);

// }

//

// }

// });

//

// return url_method_maps;

//}

 

}