实现简单的Http服务器+SpringMvc，集成到Spring
1、Http协议
1.1、HTTP 协议请求格式
方法 + 空格 + URL + 空格 + 版本 + 回车符 + 换行符
头部域名称：头部域值 + 回车符 + 换行符
...
头部域名称：头部域值 + 回车符 + 换行符
回车符 + 换行符
请求数据利用Tcp接收一条Http请求数据如下：
java
GET /task/findAll?a=b HTTP/1.1
Host: localhost:8081
Connection: keep-alive
sec-ch-ua: "Google Chrome";v="119", "Chromium";v="119", "Not?A_Brand";v="24"
sec-ch-ua-mobile: ?0
sec-ch-ua-platform: "Windows"
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Sec-Fetch-Site: none
Sec-Fetch-Mode: navigate
Sec-Fetch-User: ?1
Sec-Fetch-Dest: document
Accept-Encoding: gzip, deflate, br
Accept-Language: zh-CN,zh;q=0.9完全符合上面的http协议的格式，反过来，可以根据上面的协议格式，解析Http的参数和需要的字段。
解析完后的实体如下：
{
"headers": {
"Accept": " text/html,application/xhtml xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7",
"Connection": " keep-alive",
"User-Agent": " Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36",
"Sec-Fetch-Site": " none",
"Sec-Fetch-Dest": " document",
"Host": " localhost",
"Accept-Encoding": " gzip, deflate, br",
"content-Type": "application/x-www-form-urlencoded",
"Sec-Fetch-Mode": " navigate",
"sec-ch-ua": " \"Google Chrome\";v=\"119\", \"Chromium\";v=\"119\", \"Not?A_Brand\";v=\"24\"",
"sec-ch-ua-mobile": " ?0",
"Cache-Control": " max-age=0",
"Upgrade-Insecure-Requests": " 1",
"sec-ch-ua-platform": " \"Windows\"",
"Sec-Fetch-User": " ?1",
"Accept-Language": " zh-CN,zh;q=0.9"
},
"methodName": "GET",
"protocol": "HTTP",
"queryString": {
"a": "b"
},
"uri": "/task/findAll",
"version": "1.1"
}1.2、http协议相应格式
版本 + 空格 + 状态码 + 空格 + 原因短句 + 回车符 + 换行符
头部域名称：头部域值 + 回车符 + 换行符
...
头部域名称：头部域值 + 回车符 + 换行符
回车符 + 换行符
相应正文1.3、请求及相应
public class Test {
public static void main(String[] args) {
HttpInvoke httpInvoke = new HttpInvoke() {
@Override
public Object invoke(RequestEntity entity) {
return "hello";
}
};
BootstrapServer bootstrapServer = new BootstrapServer(8081, httpInvoke);
}
}
// HttpInvoke作为请求的回调，这里只做简单的回应"hello"，启动8081
2、SpringMvc
2.1、扫描组件包
扫描组件包，将每个接口请求封装成MethodHandler
Properties prop = PropertyUtils.getClassPathProperties(MVC_CLASSPATH_NAME);
packageScanner = new GenericPackagesScanner(ctx.getPackages());
// 1、找到被controller注解标记的类
Set<Class<?>> classes = packageScanner.getFullyQualifiedClassNameList();
Set<Class<?>> webSet = new HashSet<>();
Iterator<Class<?>> iterator = classes.iterator();
while (iterator.hasNext()) {
Class<?> next = iterator.next();
if(AnnotationUtils.containsAnyAnnotation(next, ControllerVax.class)) {
webSet.add(next);
}
}
// 2、解析处理方法
Iterator<Class<?>> controller = webSet.iterator();
List<MethodHandler> handlers = new ArrayList<>();
while (controller.hasNext()) {
Class<?> next = controller.next();
String commonUrl = AnnotationUtils.get(next, UrlMapping.class);
List<Method> methods = ClassUtils.getMarkedMethod(next, UrlMapping.class);
Iterator<Method> methodIt = methods.iterator();
while (methodIt.hasNext()) {
Method method = methodIt.next();
String subUri = AnnotationUtils.get(method, UrlMapping.class);
MethodHandler methodHandler = new MethodHandler();
methodHandler.setMethod(method);
methodHandler.setMethodURL(subUri);
methodHandler.setClazz(next);
methodHandler.setClazzUrl(commonUrl);
methodHandler.setObj(ctx.getBean(next));
methodHandler.setUrl(PathUtils.merge(commonUrl, subUri));
methodHandler.setParameters(ClassUtils.getMethodParameters(method));
if(handlers.contains(methodHandler)) {
throw new MappingExistsException("method mapping exists");
}
handlers.add(methodHandler);
}
}2.2、匹配请求
遍历所有的MethodHandler，如果接口上的uri和请求中的uri一直，则将参数带进去执行，并将结果返回。
Iterator<MethodHandler> iterator = handlers.iterator();
while (iterator.hasNext()) {
// 接口方法
MethodHandler handler = iterator.next();
if(StringUtils.equals(handler.getUrl(), entity.getUri())) {
// controller实例
Object bean = ctx.getBean(handler.getClazz());
Method method = handler.getMethod();
List<String> parameters = handler.getParameters();
List<Parameter> parameterType = Arrays.asList(method.getParameters());
Object[] parameterVal = new Object[parameters.size()];
for (int i = 0; i < parameters.size(); i++) {
// 1、queryString
Map<String, String> queryString = entity.getQueryString();
if(queryString != null && queryString.size() > 0) {
parameterVal[i] = ObjectUtils.firstNotNull(queryString.get(parameters.get(i)));
}
// 2、body-json/form-data
Map<String, String> body = (Map<String, String>) entity.getBody();
if(body != null && body.size() > 0) {
parameterVal[i] = ObjectUtils.firstNotNull(body.get(parameters.get(i)));
}
if(!ObjectUtils.isSimpleType(parameterType.get(i).getType()) && StringUtils.equalsIgnore(entity.getContentType(), Constants.JSON_CONTENT_TYPE_VAL)) {
parameterVal[i] = JSON.parseObject(entity.getBody().toString(), parameterType.get(i).getType());
}
}
return ObjectUtils.invoke(bean, method, parameterVal);
}
}3、Spring集成Mybatis
mybatis的代理对象，作为Spring组件，注入到容器中
JdbcManager jdbcManager = new JdbcManager(getJdbcProperties());
packageScanner.setPackages(ctx.getPackages());
this.classes = packageScanner.getFullyQualifiedClassNameList();
Iterator<Class<?>> iterator = this.classes.iterator();
// 2、移除没有被注解标记的类
while (iterator.hasNext()) {
Class<?> clazz = iterator.next();
if(!AnnotationUtils.containsAnyAnnotation(clazz, GlobalConstants.MAPPER_ANNOTATIONS)) {
iterator.remove();
continue;
}
ctx.registry(clazz.getSimpleName(), ProxyUtils.getProxy(clazz, new MapperProxyFactory(jdbcManager)));
}
ctx.refresh(false);
