Spring Boot HTTP over JSON 的错误码异常处理

springboot-mybatis-mutil-datasource/pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>springboot</groupId>
+    <artifactId>springboot-mybatis-mutil-datasource</artifactId>
+    <version>0.0.1-SNAPSHOT</version>
+    <name>springboot-mybatis-mutil-datasource :: Spring Boot 实现 Mybatis 多数据源配置</name>
+
+    <!-- Spring Boot 启动父依赖 -->
+    <parent>
+        <groupId>org.springframework.boot</groupId>
+        <artifactId>spring-boot-starter-parent</artifactId>
+        <version>1.5.1.RELEASE</version>
+    </parent>
+
+    <properties>
+        <mybatis-spring-boot>1.2.0</mybatis-spring-boot>
+        <mysql-connector>5.1.39</mysql-connector>
+        <druid>1.0.18</druid>
+    </properties>
+
+    <dependencies>
+
+        <!-- Spring Boot Web 依赖 -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+
+        <!-- Spring Boot Test 依赖 -->
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+
+        <!-- Spring Boot Mybatis 依赖 -->
+        <dependency>
+            <groupId>org.mybatis.spring.boot</groupId>
+            <artifactId>mybatis-spring-boot-starter</artifactId>
+            <version>${mybatis-spring-boot}</version>
+        </dependency>
+
+        <!-- Druid 数据连接池依赖 -->
+        <dependency>
+            <groupId>com.alibaba</groupId>
+            <artifactId>druid</artifactId>
+            <version>${druid}</version>
+        </dependency>
+
+        <!-- MySQL 连接驱动依赖 -->
+        <dependency>
+            <groupId>mysql</groupId>
+            <artifactId>mysql-connector-java</artifactId>
+            <version>${mysql-connector}</version>
+        </dependency>
+
+        <!-- Junit -->
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.12</version>
+        </dependency>
+    </dependencies>
+</project>

springboot-mybatis-mutil-datasource/src/main/java/org/spring/springboot/Application.java

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+package org.spring.springboot;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+/**
+ * Spring Boot 应用启动类
+ *
+ * Created by bysocket on 16/4/26.
+ */
+// Spring Boot 应用的标识
+@SpringBootApplication
+public class Application {
+
+    public static void main(String[] args) {
+        // 程序启动入口
+        // 启动嵌入式的 Tomcat 并初始化 Spring 环境及其各 Spring 组件
+        SpringApplication.run(Application.class,args);
+    }
+}

springboot-mybatis-mutil-datasource/src/main/java/org/spring/springboot/config/ds/ClusterDataSourceConfig.java

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+package org.spring.springboot.config.ds;
+
+import com.alibaba.druid.pool.DruidDataSource;
+import org.apache.ibatis.session.SqlSessionFactory;
+import org.mybatis.spring.SqlSessionFactoryBean;
+import org.mybatis.spring.annotation.MapperScan;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Primary;
+import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
+import org.springframework.jdbc.datasource.DataSourceTransactionManager;
+
+import javax.sql.DataSource;
+
+@Configuration
+// 扫描 Mapper 接口并容器管理
+@MapperScan(basePackages = ClusterDataSourceConfig.PACKAGE, sqlSessionFactoryRef = "clusterSqlSessionFactory")
+public class ClusterDataSourceConfig {
+    // 精确到 cluster 目录，以便跟其他数据源隔离
+    static final String PACKAGE = "org.spring.springboot.dao.cluster";
+    static final String MAPPER_LOCATION = "classpath:mapper/cluster/*.xml";
+
+    @Value("${cluster.datasource.url}")
+    private String url;
+
+    @Value("${cluster.datasource.username}")
+    private String user;
+
+    @Value("${cluster.datasource.password}")
+    private String password;
+
+    @Value("${cluster.datasource.driverClassName}")
+    private String driverClass;
+
+    @Bean(name = "clusterDataSource")
+    public DataSource clusterDataSource() {
+        DruidDataSource dataSource = new DruidDataSource();
+        dataSource.setDriverClassName(driverClass);
+        dataSource.setUrl(url);
+        dataSource.setUsername(user);
+        dataSource.setPassword(password);
+        return dataSource;
+    }
+
+    @Bean(name = "clusterTransactionManager")
+    public DataSourceTransactionManager clusterTransactionManager() {
+        return new DataSourceTransactionManager(clusterDataSource());
+    }
+
+    @Bean(name = "clusterSqlSessionFactory")
+    public SqlSessionFactory clusterSqlSessionFactory(@Qualifier("clusterDataSource") DataSource clusterDataSource)
+            throws Exception {
+        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
+        sessionFactory.setDataSource(clusterDataSource);
+        sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver()
+                .getResources(ClusterDataSourceConfig.MAPPER_LOCATION));
+        return sessionFactory.getObject();
+    }
+}

springboot-mybatis-mutil-datasource/src/main/java/org/spring/springboot/config/ds/MasterDataSourceConfig.java

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+package org.spring.springboot.config.ds;
+
+import com.alibaba.druid.pool.DruidDataSource;
+import org.apache.ibatis.session.SqlSessionFactory;
+import org.mybatis.spring.SqlSessionFactoryBean;
+import org.mybatis.spring.annotation.MapperScan;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.context.properties.ConfigurationProperties;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Primary;
+import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
+import org.springframework.jdbc.datasource.DataSourceTransactionManager;
+
+import javax.sql.DataSource;
+
+@Configuration
+// 扫描 Mapper 接口并容器管理
+@MapperScan(basePackages = MasterDataSourceConfig.PACKAGE, sqlSessionFactoryRef = "masterSqlSessionFactory")
+public class MasterDataSourceConfig {
+    // 精确到 master 目录，以便跟其他数据源隔离
+    static final String PACKAGE = "org.spring.springboot.dao.master";
+    static final String MAPPER_LOCATION = "classpath:mapper/master/*.xml";
+
+    @Value("${master.datasource.url}")
+    private String url;
+
+    @Value("${master.datasource.username}")
+    private String user;
+
+    @Value("${master.datasource.password}")
+    private String password;
+
+    @Value("${master.datasource.driverClassName")
+    private String driverClass;
+
+    @Bean(name = "masterDataSource")
+    @Primary
+    public DataSource masterDataSource() {
+        DruidDataSource dataSource = new DruidDataSource();
+        dataSource.setDriverClassName(driverClass);
+        dataSource.setUrl(url);
+        dataSource.setUsername(user);
+        dataSource.setPassword(password);
+        return dataSource;
+    }
+
+    @Bean(name = "masterTransactionManager")
+    @Primary
+    public DataSourceTransactionManager masterTransactionManager() {
+        return new DataSourceTransactionManager(masterDataSource());
+    }
+
+    @Bean(name = "masterSqlSessionFactory")
+    @Primary
+    public SqlSessionFactory masterSqlSessionFactory(@Qualifier("masterDataSource") DataSource masterDataSource)
+            throws Exception {
+        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
+        sessionFactory.setDataSource(masterDataSource);
+        sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver()
+                .getResources(MasterDataSourceConfig.MAPPER_LOCATION));
+        return sessionFactory.getObject();
+    }
+}

springboot-mybatis-mutil-datasource/src/main/java/org/spring/springboot/controller/UserRestController.java

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+package org.spring.springboot.controller;
+
+import org.spring.springboot.domain.City;
+import org.spring.springboot.domain.User;
+import org.spring.springboot.service.UserService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+/**
+ * 用户控制层
+ *
+ * Created by bysocket on 07/02/2017.
+ */
+@RestController
+public class UserRestController {
+
+    @Autowired
+    private UserService userService;
+
+    /**
+     * 根据用户名获取用户信息，包括从库的地址信息
+     *
+     * @param userName
+     * @return
+     */
+    @RequestMapping(value = "/api/user", method = RequestMethod.GET)
+    public User findByName(@RequestParam(value = "userName", required = true) String userName) {
+        return userService.findByName(userName);
+    }
+
+}

springboot-mybatis-mutil-datasource/src/main/java/org/spring/springboot/dao/cluster/CityDao.java

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+package org.spring.springboot.dao.cluster;
+
+import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Param;
+import org.spring.springboot.domain.City;
+
+/**
+ * 城市 DAO 接口类
+ *
+ * Created by bysocket on 07/02/2017.
+ */
+@Mapper
+public interface CityDao {
+
+    /**
+     * 根据城市名称，查询城市信息
+     *
+     * @param cityName 城市名
+     */
+    City findByName(@Param("cityName") String cityName);
+}

springboot-mybatis-mutil-datasource/src/main/java/org/spring/springboot/dao/master/UserDao.java

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+package org.spring.springboot.dao.master;
+
+import org.apache.ibatis.annotations.Mapper;
+import org.apache.ibatis.annotations.Param;
+import org.spring.springboot.domain.User;
+
+/**
+ * 用户 DAO 接口类
+ *
+ * Created by bysocket on 07/02/2017.
+ */
+@Mapper
+public interface UserDao {
+
+    /**
+     * 根据用户名获取用户信息
+     *
+     * @param userName
+     * @return
+     */
+    User findByName(@Param("userName") String userName);
+}

springboot-mybatis-mutil-datasource/src/main/java/org/spring/springboot/domain/City.java

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+package org.spring.springboot.domain;
+
+import java.io.Serializable;
+
+/**
+ * 城市实体类
+ *
+ * Created by bysocket on 07/02/2017.
+ */
+public class City {
+
+    /**
+     * 城市编号
+     */
+    private Long id;
+
+    /**
+     * 省份编号
+     */
+    private Long provinceId;
+
+    /**
+     * 城市名称
+     */
+    private String cityName;
+
+    /**
+     * 描述
+     */
+    private String description;
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public Long getProvinceId() {
+        return provinceId;
+    }
+
+    public void setProvinceId(Long provinceId) {
+        this.provinceId = provinceId;
+    }
+
+    public String getCityName() {
+        return cityName;
+    }
+
+    public void setCityName(String cityName) {
+        this.cityName = cityName;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+}

springboot-mybatis-mutil-datasource/src/main/java/org/spring/springboot/domain/User.java

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+package org.spring.springboot.domain;
+
+/**
+ * 用户实体类
+ *
+ * Created by bysocket on 07/02/2017.
+ */
+public class User {
+
+    /**
+     * 城市编号
+     */
+    private Long id;
+
+    /**
+     * 城市名称
+     */
+    private String userName;
+
+    /**
+     * 描述
+     */
+    private String description;
+
+    private City city;
+
+    public City getCity() {
+        return city;
+    }
+
+    public void setCity(City city) {
+        this.city = city;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getUserName() {
+        return userName;
+    }
+
+    public void setUserName(String userName) {
+        this.userName = userName;
+    }
+
+    public String getDescription() {
+        return description;
+    }
+
+    public void setDescription(String description) {
+        this.description = description;
+    }
+}

springboot-mybatis-mutil-datasource/src/main/java/org/spring/springboot/service/UserService.java

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+package org.spring.springboot.service;
+
+import org.spring.springboot.domain.City;
+import org.spring.springboot.domain.User;
+
+/**
+ * 用户业务接口层
+ *
+ * Created by bysocket on 07/02/2017.
+ */
+public interface UserService {
+
+    /**
+     * 根据用户名获取用户信息，包括从库的地址信息
+     *
+     * @param userName
+     * @return
+     */
+    User findByName(String userName);
+}

springboot-mybatis-mutil-datasource/src/main/java/org/spring/springboot/service/impl/UserServiceImpl.java

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+package org.spring.springboot.service.impl;
+
+import org.spring.springboot.dao.cluster.CityDao;
+import org.spring.springboot.dao.master.UserDao;
+import org.spring.springboot.domain.City;
+import org.spring.springboot.domain.User;
+import org.spring.springboot.service.UserService;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+/**
+ * 用户业务实现层
+ *
+ * Created by bysocket on 07/02/2017.
+ */
+@Service
+public class UserServiceImpl implements UserService {
+
+    @Autowired
+    private UserDao userDao; // 主数据源
+
+    @Autowired
+    private CityDao cityDao; // 从数据源
+
+    @Override
+    public User findByName(String userName) {
+        User user = userDao.findByName(userName);
+        City city = cityDao.findByName("温岭市");
+        user.setCity(city);
+        return user;
+    }
+}

springboot-mybatis-mutil-datasource/src/main/resources/application.properties

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+## master 数据源配置
+master.datasource.url=jdbc:mysql://localhost:3306/springbootdb?useUnicode=true&characterEncoding=utf8
+master.datasource.username=root
+master.datasource.password=123456
+master.datasource.driverClassName=com.mysql.jdbc.Driver
+
+## cluster 数据源配置
+cluster.datasource.url=jdbc:mysql://localhost:3306/springbootdb_cluster?useUnicode=true&characterEncoding=utf8
+cluster.datasource.username=root
+cluster.datasource.password=123456
+cluster.datasource.driverClassName=com.mysql.jdbc.Driver

springboot-mybatis-mutil-datasource/src/main/resources/mapper/CityMapper.xml

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+<?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="org.spring.springboot.dao.cluster.CityDao">
+	<resultMap id="BaseResultMap" type="org.spring.springboot.domain.City">
+		<result column="id" property="id" />
+		<result column="province_id" property="provinceId" />
+		<result column="city_name" property="cityName" />
+		<result column="description" property="description" />
+	</resultMap>
+
+	<parameterMap id="City" type="org.spring.springboot.domain.City"/>
+
+	<sql id="Base_Column_List">
+		id, province_id, city_name, description
+	</sql>
+
+	<select id="findByName" resultMap="BaseResultMap" parameterType="java.lang.String">
+		select
+		<include refid="Base_Column_List" />
+		from city
+		where city_name = #{cityName}
+	</select>
+
+</mapper>

springboot-mybatis-mutil-datasource/src/main/resources/mapper/master/UserMapper.xml

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+<?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="org.spring.springboot.dao.master.UserDao">
+	<resultMap id="BaseResultMap" type="org.spring.springboot.domain.User">
+		<result column="id" property="id" />
+		<result column="user_name" property="userName" />
+		<result column="description" property="description" />
+	</resultMap>
+
+	<parameterMap id="User" type="org.spring.springboot.domain.User"/>
+
+	<sql id="Base_Column_List">
+		id, user_name, description
+	</sql>
+
+	<select id="findByName" resultMap="BaseResultMap" parameterType="java.lang.String">
+		select
+		<include refid="Base_Column_List" />
+		from user
+		where id = 1
+	</select>
+
+</mapper>