0.从零开始写一个spring mvc框架之 - 简介

写在前面

整个项目基于servlet 3.0开发，纯粹用于学习spring mvc框架原理的。框架设计的使用方式也尽量是参考spring mvc的，配置全部使用注解做，不要xml。由于作者本人水平有限(第二次写博客)，代码若有错误或是遗漏，欢迎指正，再或是有更好的实现，更是跪求指教了。（联系qq1455066227@gmail.com）

• 项目实现功能
  • webmvc大部分功能
  • aop（其实只是controller的aop手动划掉，哈哈）
  • 统一异常处理
  • 集成模板引擎thymeleaf
• 项目使用jdk8做开发。项目使用到的库
  • servlet 3.0: servlet
  • log4j: 日志
  • commons-fileupload: 文件上传
  • gson: json
  • thymeleaf: 模板引擎

使用效果如下（具体细节请参考之后的版本）

import cn.isaxon.iservlet.annation.*;
import cn.isaxon.iservlet.aspect.annotion.Intercept;
import cn.isaxon.iservlet.bean.HttpMethod;
import cn.isaxon.iservlet.bean.ThymeleafMap;
import cn.isaxon.iservlet.gson.GsonFilter;
import cn.isaxon.iservlet.z_test.User;
import cn.isaxon.iservlet.z_test.aspect.WebAspect;
import org.apache.log4j.Logger;

import javax.servlet.http.Part;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * <p></p>
 * <p>Copyright:@isaxon.cn</p>
 *
 * @author saxon/isaxon
 * Create 2017-12-19 10:29 By qq145
 */
@Controller
@CrossOrigin//(methods = {HttpMethod.POST})
@Intercept(type = WebAspect.class)
@RequestMapping({"/isaxon", "/test"})
public class TestController
{
    private static Logger logger = Logger.getLogger(TestController.class);
    @GetMapping({"/hello", "h"})
    public String hello()
    {
        return "Hello";
    }

    @GetMapping("/hello/result")
    public User result(@RequestParam("test") String test)
    {
        logger.info(test);
        User user = new User();
        user.name = test;
        return user;
    }

    @RequestMapping(value = "/world", method = {HttpMethod.OPTIONS})
    public int world()
    {
        return 15;
    }

    @PostMapping("/upload")
    public void upload(@RequestParam("image") List<Part> fileItems,
                       @RequestParam("file") String file)
    {
        logger.info(fileItems.size());
        logger.info(file);
        fileItems.forEach(TestController::saveFile);
    }

    private static void saveFile(Part part)
    {
        try
        {
            logger.info(part.getSubmittedFileName());
            part.getHeaderNames().forEach(logger::info);

            part.write("/home/isaxon/Downloads/" + part.getSubmittedFileName());
        } catch (Exception e)
        {
            logger.error(e.getMessage(), e);
        }
    }

    @GetMapping("/home")
    public ThymeleafMap thymeleafTest(@RequestParam("text") String text)
    {
        ThymeleafMap thymeleafMap = new ThymeleafMap("index.html");
        thymeleafMap.put("val", text);
        return thymeleafMap;
    }

    @GetMapping("/exception")
    public String exception(@RequestParam("id") Integer id)
    {
        if (id == 0)
            throw new NullPointerException("Id is not can be zero");
        return "Hello World!";
    }

    private class GsonFilterTest
    {
        public Integer test = 15;

        public Integer age = 10;

        public String name = "11";

        public String nsf = "sdf";
    }

    @GsonFilter({
            @GsonFilter.GsonFieldFilter(type = User.class, include = {"name", "id"}),
            @GsonFilter.GsonFieldFilter(type = GsonFilterTest.class, exclude = {"name", "nsf"}),
    })
    @GetMapping("/gosnfilter")
    public Map<String, Object> gosnfilter()
    {
        User user = new User();
        user.name = "@isaxon.cn";
        user.age = 15;
        Map<String, Object> result = new HashMap<>();
        result.put("USer", user);
        result.put("GsonFilterTest", new GsonFilterTest());
        return result;
    }

}