SpringBoot中动态注册接口-编程知识

1. 说明

接口注册，使用RequestMappingHandlerMapping来实现
mybatis中动态执行sql使用github上的SqlMapper工具类实现

2. 核心代码片段

以下代码为spring动态注册接口代码示例

@Autowired
private RequestMappingHandlerMapping requestMappingHandlerMapping;public boolean register2Spring(String path) {RequestMappingInfo requestMappingInfo = RequestMappingInfo.paths(path).methods(RequestMethod.POST).produces(MediaType.APPLICATION_JSON_VALUE).options(requestMappingHandlerMapping.getBuilderConfiguration()).build();Method method = ReflectionUtils.findMethod(getClass(), "handler",HttpServletRequest.class, HttpServletResponse.class,Map.class, Map.class, Map.class);boolean status = true;try {requestMappingHandlerMapping.registerMapping(requestMappingInfo, this, method);LOGGER.info("【接口注册成功】{}", path);} catch (Exception e) {status = false;LOGGER.error("【注册接口异常】动态映射失败", e.getMessage());}return status;}

3. 源码

3.1 核心代码

3.1.1 ApiServiceHandler

handler中register职责如下：

注册到数据库中
注册接口到spring容器中

import com.alibaba.fastjson2.JSONObject;
import com.google.common.net.HttpHeaders;
import com.hz.pro.artifact.bean.CommonException;
import com.hz.pro.artifact.bean.Response;
import com.hz.pro.artifact.dynamic.bean.ServiceDto;
import com.hz.pro.artifact.dynamic.mapper.main.ApiServiceMapper;
import com.hz.pro.artifact.utils.SqlMapper;
import org.apache.ibatis.session.SqlSessionFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Service;
import org.springframework.util.ReflectionUtils;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.servlet.mvc.method.RequestMappingInfo;
import org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.lang.reflect.Method;
import java.util.List;
import java.util.Map;/*** @author pp_lan* @date 2024/1/4*/
@Service
public class ApiServiceHandler {private static final Logger LOGGER = LoggerFactory.getLogger(ApiServiceHandler.class);@Autowiredprivate RequestMappingHandlerMapping requestMappingHandlerMapping;@Autowired@Qualifier("sqlSessionFactory")private SqlSessionFactory sqlSessionFactory;@Autowiredprivate ApiServiceMapper apiServiceMapper;public void initialRegister() {List<ServiceDto> apis = findApis();for (ServiceDto api : apis) {try {register2Spring(api.getPath());} catch (Exception e) {LOGGER.error("[接口注册失败]{}", api.getPath(), e.getMessage());}}}/*** 注册到spring，并添加到数据库中** @param path* @param sql* @return*/public boolean register(String path, String sql) {boolean status = this.registerApiOfSql(path, sql);if (status) {status = register2Spring(path);}return status;}/*** 注册到容器** @param path* @return*/public boolean register2Spring(String path) {RequestMappingInfo requestMappingInfo = RequestMappingInfo.paths(path).methods(RequestMethod.POST).produces(MediaType.APPLICATION_JSON_VALUE).options(requestMappingHandlerMapping.getBuilderConfiguration()).build();Method method = ReflectionUtils.findMethod(getClass(), "handler",HttpServletRequest.class, HttpServletResponse.class,Map.class, Map.class, Map.class);boolean status = true;try {requestMappingHandlerMapping.registerMapping(requestMappingInfo, this, method);LOGGER.info("【接口注册成功】{}", path);} catch (Exception e) {status = false;LOGGER.error("【注册接口异常】动态映射失败", e.getMessage());}return status;}@ResponseBodypublic Response handler(HttpServletRequest request, HttpServletResponse response,@PathVariable(required = false) Map<String, Object> pathVariable,@RequestParam(required = false) Map<String, Object> requestParam,@RequestBody(required = false) Map<String, Object> requestBody) {String header = request.getHeader(HttpHeaders.CONTENT_TYPE);// 参数处理JSONObject params;if (header != null && header.contains(MediaType.APPLICATION_JSON_VALUE)) {params = new JSONObject(requestBody);} else {params = new JSONObject(requestParam);}// 执行查询try (SqlMapper sqlMapper = new SqlMapper(sqlSessionFactory)) {String path = request.getRequestURI();String sql = apiServiceMapper.findSqlByPath(path);List<Map<String, Object>> result = sqlMapper.selectList(sql, params);return Response.ok(result);} catch (Exception e) {throw new CommonException("【公共查询异常】", e);}}/*** 查询所有在用接口** @return*/public List<ServiceDto> findApis() {return apiServiceMapper.findApis();}/*** 注册接口** @param path* @param sql* @return*/public boolean registerApiOfSql(String path, String sql) {try {return apiServiceMapper.insertApiSql(path, sql) > 0;} catch (Exception e) {throw new CommonException("【注册接口异常】插入sql配置失败", e);}}}

3.1.2 DynamicController

手动注册接口执行/dynamic/register方法，便可以完成接口注册。

import com.hz.pro.artifact.bean.Response;
import com.hz.pro.artifact.dynamic.bean.ApiReq;
import com.hz.pro.artifact.dynamic.service.ApiServiceHandler;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;/*** @author pp_lan* @date 2024/1/2*/
@RestController
@RequestMapping("/dynamic")
public class DynamicController {@Autowiredprivate ApiServiceHandler apiServiceHandler;/*** 注册接口** @param apiReq* @return*/@PostMapping("register")public Response register(@RequestBody @Validated ApiReq apiReq) {boolean registerStatus = apiServiceHandler.register(apiReq.getPath(), apiReq.getSql());return registerStatus ? Response.ok("接口注册成功") : Response.error("接口注册失败");}
}

3.2 依赖类

3.2.1 SqlMapper

此为github上有开源工具类，最新代码请移步github。以下为其源码：

import org.apache.ibatis.builder.StaticSqlSource;
import org.apache.ibatis.exceptions.TooManyResultsException;
import org.apache.ibatis.mapping.*;
import org.apache.ibatis.scripting.LanguageDriver;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;import java.util.ArrayList;
import java.util.List;
import java.util.Map;/*** MyBatis执行sql工具，在写SQL的时候建议使用参数形式的可以是${}或#{}** 不建议将参数直接拼到字符串中，当大量这么使用的时候由于缓存MappedStatement而占用更多的内存** @author liuzh* @since 2015-03-10*/
public class SqlMapper implements AutoCloseable {private final MSUtils msUtils;private final SqlSession sqlSession;/*** 构造方法，默认缓存MappedStatement** @param sqlSession*/public SqlMapper(SqlSession sqlSession) {this.sqlSession = sqlSession;this.msUtils = new MSUtils(sqlSession.getConfiguration());}public SqlMapper(SqlSessionFactory sqlSessionFactory) {this.sqlSession = sqlSessionFactory.openSession();this.msUtils = new MSUtils(sqlSession.getConfiguration());}/*** 获取List中最多只有一个的数据** @param list List结果* @param <T>  泛型类型* @return*/private <T> T getOne(List<T> list) {if (list.size() == 1) {return list.get(0);} else if (list.size() > 1) {throw new TooManyResultsException("Expected one result (or null) to be returned by selectOne(), but found: " + list.size());} else {return null;}}/*** 查询返回一个结果，多个结果时抛出异常** @param sql 执行的sql* @return*/public Map<String, Object> selectOne(String sql) {List<Map<String, Object>> list = selectList(sql);return getOne(list);}/*** 查询返回一个结果，多个结果时抛出异常** @param sql   执行的sql* @param value 参数* @return*/public Map<String, Object> selectOne(String sql, Object value) {List<Map<String, Object>> list = selectList(sql, value);return getOne(list);}/*** 查询返回一个结果，多个结果时抛出异常** @param sql        执行的sql* @param resultType 返回的结果类型* @param <T>        泛型类型* @return*/public <T> T selectOne(String sql, Class<T> resultType) {List<T> list = selectList(sql, resultType);return getOne(list);}/*** 查询返回一个结果，多个结果时抛出异常** @param sql        执行的sql* @param value      参数* @param resultType 返回的结果类型* @param <T>        泛型类型* @return*/public <T> T selectOne(String sql, Object value, Class<T> resultType) {List<T> list = selectList(sql, value, resultType);return getOne(list);}/*** 查询返回List<Map<String, Object>>** @param sql 执行的sql* @return*/public List<Map<String, Object>> selectList(String sql) {String msId = msUtils.select(sql);return sqlSession.selectList(msId);}/*** 查询返回List<Map<String, Object>>** @param sql   执行的sql* @param value 参数* @return*/public List<Map<String, Object>> selectList(String sql, Object value) {Class<?> parameterType = value != null ? value.getClass() : null;String msId = msUtils.selectDynamic(sql, parameterType);return sqlSession.selectList(msId, value);}/*** 查询返回指定的结果类型** @param sql        执行的sql* @param resultType 返回的结果类型* @param <T>        泛型类型* @return*/public <T> List<T> selectList(String sql, Class<T> resultType) {String msId;if (resultType == null) {msId = msUtils.select(sql);} else {msId = msUtils.select(sql, resultType);}return sqlSession.selectList(msId);}/*** 查询返回指定的结果类型** @param sql        执行的sql* @param value      参数* @param resultType 返回的结果类型* @param <T>        泛型类型* @return*/public <T> List<T> selectList(String sql, Object value, Class<T> resultType) {String msId;Class<?> parameterType = value != null ? value.getClass() : null;if (resultType == null) {msId = msUtils.selectDynamic(sql, parameterType);} else {msId = msUtils.selectDynamic(sql, parameterType, resultType);}return sqlSession.selectList(msId, value);}/*** 插入数据** @param sql 执行的sql* @return*/public int insert(String sql) {String msId = msUtils.insert(sql);return sqlSession.insert(msId);}/*** 插入数据** @param sql   执行的sql* @param value 参数* @return*/public int insert(String sql, Object value) {Class<?> parameterType = value != null ? value.getClass() : null;String msId = msUtils.insertDynamic(sql, parameterType);return sqlSession.insert(msId, value);}/*** 更新数据** @param sql 执行的sql* @return*/public int update(String sql) {String msId = msUtils.update(sql);return sqlSession.update(msId);}/*** 更新数据** @param sql   执行的sql* @param value 参数* @return*/public int update(String sql, Object value) {Class<?> parameterType = value != null ? value.getClass() : null;String msId = msUtils.updateDynamic(sql, parameterType);return sqlSession.update(msId, value);}/*** 删除数据** @param sql 执行的sql* @return*/public int delete(String sql) {String msId = msUtils.delete(sql);return sqlSession.delete(msId);}/*** 删除数据** @param sql   执行的sql* @param value 参数* @return*/public int delete(String sql, Object value) {Class<?> parameterType = value != null ? value.getClass() : null;String msId = msUtils.deleteDynamic(sql, parameterType);return sqlSession.delete(msId, value);}@Overridepublic void close() throws Exception {this.sqlSession.close();}private class MSUtils {private Configuration configuration;private LanguageDriver languageDriver;private MSUtils(Configuration configuration) {this.configuration = configuration;languageDriver = configuration.getDefaultScriptingLanuageInstance();}/*** 创建MSID** @param sql 执行的sql* @param sql 执行的sqlCommandType* @return*/private String newMsId(String sql, SqlCommandType sqlCommandType) {StringBuilder msIdBuilder = new StringBuilder(sqlCommandType.toString());msIdBuilder.append(".").append(sql.hashCode());return msIdBuilder.toString();}/*** 是否已经存在该ID** @param msId* @return*/private boolean hasMappedStatement(String msId) {return configuration.hasStatement(msId, false);}/*** 创建一个查询的MS** @param msId* @param sqlSource  执行的sqlSource* @param resultType 返回的结果类型*/private void newSelectMappedStatement(String msId, SqlSource sqlSource, final Class<?> resultType) {MappedStatement ms = new MappedStatement.Builder(configuration, msId, sqlSource, SqlCommandType.SELECT).resultMaps(new ArrayList<ResultMap>() {{add(new ResultMap.Builder(configuration, "defaultResultMap", resultType, new ArrayList<ResultMapping>(0)).build());}}).build();//缓存configuration.addMappedStatement(ms);}/*** 创建一个简单的MS** @param msId* @param sqlSource      执行的sqlSource* @param sqlCommandType 执行的sqlCommandType*/private void newUpdateMappedStatement(String msId, SqlSource sqlSource, SqlCommandType sqlCommandType) {MappedStatement ms = new MappedStatement.Builder(configuration, msId, sqlSource, sqlCommandType).resultMaps(new ArrayList<ResultMap>() {{add(new ResultMap.Builder(configuration, "defaultResultMap", int.class, new ArrayList<ResultMapping>(0)).build());}}).build();//缓存configuration.addMappedStatement(ms);}private String select(String sql) {String msId = newMsId(sql, SqlCommandType.SELECT);if (hasMappedStatement(msId)) {return msId;}StaticSqlSource sqlSource = new StaticSqlSource(configuration, sql);newSelectMappedStatement(msId, sqlSource, Map.class);return msId;}private String selectDynamic(String sql, Class<?> parameterType) {String msId = newMsId(sql + parameterType, SqlCommandType.SELECT);if (hasMappedStatement(msId)) {return msId;}SqlSource sqlSource = languageDriver.createSqlSource(configuration, sql, parameterType);newSelectMappedStatement(msId, sqlSource, Map.class);return msId;}private String select(String sql, Class<?> resultType) {String msId = newMsId(resultType + sql, SqlCommandType.SELECT);if (hasMappedStatement(msId)) {return msId;}StaticSqlSource sqlSource = new StaticSqlSource(configuration, sql);newSelectMappedStatement(msId, sqlSource, resultType);return msId;}private String selectDynamic(String sql, Class<?> parameterType, Class<?> resultType) {String msId = newMsId(resultType + sql + parameterType, SqlCommandType.SELECT);if (hasMappedStatement(msId)) {return msId;}SqlSource sqlSource = languageDriver.createSqlSource(configuration, sql, parameterType);newSelectMappedStatement(msId, sqlSource, resultType);return msId;}private String insert(String sql) {String msId = newMsId(sql, SqlCommandType.INSERT);if (hasMappedStatement(msId)) {return msId;}StaticSqlSource sqlSource = new StaticSqlSource(configuration, sql);newUpdateMappedStatement(msId, sqlSource, SqlCommandType.INSERT);return msId;}private String insertDynamic(String sql, Class<?> parameterType) {String msId = newMsId(sql + parameterType, SqlCommandType.INSERT);if (hasMappedStatement(msId)) {return msId;}SqlSource sqlSource = languageDriver.createSqlSource(configuration, sql, parameterType);newUpdateMappedStatement(msId, sqlSource, SqlCommandType.INSERT);return msId;}private String update(String sql) {String msId = newMsId(sql, SqlCommandType.UPDATE);if (hasMappedStatement(msId)) {return msId;}StaticSqlSource sqlSource = new StaticSqlSource(configuration, sql);newUpdateMappedStatement(msId, sqlSource, SqlCommandType.UPDATE);return msId;}private String updateDynamic(String sql, Class<?> parameterType) {String msId = newMsId(sql + parameterType, SqlCommandType.UPDATE);if (hasMappedStatement(msId)) {return msId;}SqlSource sqlSource = languageDriver.createSqlSource(configuration, sql, parameterType);newUpdateMappedStatement(msId, sqlSource, SqlCommandType.UPDATE);return msId;}private String delete(String sql) {String msId = newMsId(sql, SqlCommandType.DELETE);if (hasMappedStatement(msId)) {return msId;}StaticSqlSource sqlSource = new StaticSqlSource(configuration, sql);newUpdateMappedStatement(msId, sqlSource, SqlCommandType.DELETE);return msId;}private String deleteDynamic(String sql, Class<?> parameterType) {String msId = newMsId(sql + parameterType, SqlCommandType.DELETE);if (hasMappedStatement(msId)) {return msId;}SqlSource sqlSource = languageDriver.createSqlSource(configuration, sql, parameterType);newUpdateMappedStatement(msId, sqlSource, SqlCommandType.DELETE);return msId;}}
}

3.2.2 ApiServiceMapper

import com.hz.pro.artifact.dynamic.bean.ServiceDto;
import org.apache.ibatis.annotations.Param;import java.util.List;/*** @author pp_lan* @date 2024/1/5*/
public interface ApiServiceMapper {List<ServiceDto> findApis();String findSqlByPath(@Param("path") String path);int insertApiSql(@Param("path") String path, @Param("sqlContent") String sqlContent);
}

3.2.3 ApiServiceMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.hz.pro.artifact.dynamic.mapper.main.ApiServiceMapper"><select id="findApis" resultType="com.hz.pro.artifact.dynamic.bean.ServiceDto">select path, sql_content from t_api_sql where in_use = 1</select><select id="findSqlByPath" resultType="java.lang.String">select sql_content from t_api_sql where path = #{path} and in_use = 1</select><insert id="insertApiSql">INSERT INTO t_api_sql VALUES(#{path}, #{sqlContent}, 1)</insert></mapper>