手写Spring、SpringMVC

2020-07-01 18:46:09 763

目前实现了以下注解

@Autowired 从容器中自动注入

@Bean 标记方法返回值加入容器管理

@Component 标记此类加入容器管理

@RestController 标记此类为Rest风格的控制器 结果默认转为json

@RequestMapping 前置匹配路径

@GetMapping 匹配一个Get请求

@PutMapping 匹配一个Put请求

@DeleteMapping 匹配一个Delete请求

@PostMapping 匹配一个Post请求

@PatchMapping 匹配一个Patch请求

@ExceptionHandler 标记此方法处理一个异常

项目地址https://github.com/MQPearth/SimpleFrame

先来测试一下

用源码构建好的jar包，加入依赖，工程目录如下

config

加上@Bean注解

package com.test.config;


import simpleframe.annotation.bean.Bean;

public class ApplicationConfig {


    @Bean
    public String getApplicationName() {
        return "Hello Simple Frame";
    }

}

Result

定义响应结果类

package com.test.model;

public class Result {
    public static final int RESULT_OK = 200;


    private Integer code;
    private String message;


    private Result() {
    }

    public Integer getCode() {
        return code;
    }

    public void setCode(Integer code) {
        this.code = code;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public static Result resultFactory(int code, String message) {
        Result result = new Result();
        result.setCode(code);
        result.setMessage(message);
        return result;
    }


}

controller

写一个控制器

package com.test.controller;


import com.test.model.Result;
import simpleframe.annotation.bean.Autowired;
import simpleframe.annotation.mvc.GetMapping;
import simpleframe.annotation.mvc.RequestMapping;
import simpleframe.annotation.mvc.RestController;

import javax.servlet.http.HttpServletRequest;



@RestController
@RequestMapping("/simpleframe")
public class HelloController {

    @Autowired
    private String applicationName;
	
    /**
    * 线程安全
    */
    @Autowired
    private HttpServletRequest request;

    @GetMapping("/hello")
    public Result hello() {
        System.out.println(request.getRequestURL());

        return Result.resultFactory(Result.RESULT_OK, applicationName);
    }
}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
		  http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
         version="2.5">
    <servlet>
        <servlet-name>startupservlet</servlet-name>
        <servlet-class>simpleframe.servlet.StartUpServlet</servlet-class>
        <!-- 随容器启动 -->
        <load-on-startup>0</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>startupservlet</servlet-name>
        <!-- 匹配所有路径 -->
        <url-pattern>/*</url-pattern>
    </servlet-mapping>

</web-app>

测试接口

启动容器，访问接口

StartUpServlet.java

初始化流程

请求分发流程

• spring
• springmvc