【java】SSM整合

博主：本当迷
发布时间：2022 年 08 月 01 日
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分类： java

## 总结前：

东西有点多，确实有点难，只是了解了个有里面可能有这个东西，这个东西有什么用，但是如果让我熟练的进行使用，可能还比较困难，嘿嘿，可能过不了多少天就会忘记了，只能到时候再查！

## 总结

### 大概的项目框架

![](https://www.bdmcom.cn/usr/uploads/2022/08/2399837762.png)

## config配置类

### jdbcConfig

连接数据库的基本信息

```java
package com.bdm.config;

import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import org.springframework.transaction.PlatformTransactionManager;

import javax.sql.DataSource;

/**
 * @code Description
 * @code author 本当迷
 * @code date 2022/8/1-6:57
 */
public class JdbcConfig {

@Value("${jdbc.driver}")
    private String driver;

@Value("${jdbc.url}")
    private String url;

@Value("${jdbc.password}")
    private String password;

@Value("${jdbc.username}")
    private String username;

@Bean
    public DataSource dataSource(){
        final DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName(driver);
        dataSource.setUsername(username);
        dataSource.setPassword(password);
        dataSource.setUrl(url);
        return dataSource;

}

@Bean
    public PlatformTransactionManager transactionManager(DataSource dataSource){
        final DataSourceTransactionManager ds = new DataSourceTransactionManager();
        ds.setDataSource(dataSource);
        return ds;
    }

}

```

### MyBatisConfig

配置mybatis映射的路径与类型

```java
package com.bdm.config;

import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.context.annotation.Bean;

import javax.sql.DataSource;
import javax.xml.crypto.Data;

/**
 * @code Description
 * @code author 本当迷
 * @code date 2022/8/1-6:58
 */
public class MyBatisConfig {
    @Bean
    public SqlSessionFactoryBean sqlSessionFactory(DataSource dataSource){
        final SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
        factoryBean .setDataSource(dataSource);
        factoryBean.setTypeAliasesPackage("com.bdm.domain");
        return factoryBean;
    }

@Bean
    public MapperScannerConfigurer mapperScannerConfigurer(){
        final MapperScannerConfigurer msc = new MapperScannerConfigurer();
        msc.setBasePackage("com.bdm.dao");
        return msc;
    }
}

```

### servletConfig

配置过滤器

```java
package com.bdm.config;

import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

/**
 * @code Description
 * @code author 本当迷
 * @code date 2022/8/1-7:36
 */
public class ServletConfig extends AbstractAnnotationConfigDispatcherServletInitializer {
    @Override
    protected Class<?>[] getRootConfigClasses() {
        return new Class[]{SpringConfig.class};
    }

@Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class[]{SpringMvcConfig.class};
    }

@Override
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }
}

```

### SpringConfig

spring的核心配置类

```java
package com.bdm.config;

import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.PropertySource;
import org.springframework.transaction.annotation.EnableTransactionManagement;

/**
 * @code Description
 * @code author 本当迷
 * @code date 2022/8/1-6:56
 */
@Configuration
@ComponentScan({"com.bdm.service"})
@PropertySource("classpath:jdbc.properties")
@Import({JdbcConfig.class, MyBatisConfig.class})
// 开启事务
@EnableTransactionManagement
public class SpringConfig {
}

```

### SpringMvcConfig

SpringMvc的核心配置类与拦截器

```java
package com.bdm.config;

import com.bdm.controller.interceptor.ProjectInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

/**
 * @code Description
 * @code author 本当迷
 * @code date 2022/8/1-7:37
 */
@Configuration
@ComponentScan({"com.bdm.controller"})
@EnableWebMvc
public class SpringMvcConfig implements WebMvcConfigurer {
    @Autowired
    private ProjectInterceptor projectInterceptor; // 注入拦截器

@Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/pages/**").addResourceLocations("/pages/");
        registry.addResourceHandler("/css/**").addResourceLocations("/css/");
        registry.addResourceHandler("/js/**").addResourceLocations("/js/");
        registry.addResourceHandler("/plugins/**").addResourceLocations("/plugins/");
    }

@Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(projectInterceptor).addPathPatterns("/books", "/books/*");
    }
}

```

## controller接口管理

### ProjectInterceptor

拦截器关键实现

```java
package com.bdm.controller.interceptor;

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * @code Description
 * @code author 本当迷
 * @code date 2022/8/1-15:47
 */
@Component
public class ProjectInterceptor implements HandlerInterceptor {
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("interceptor ...");
        return true; //为true放行，false拦截
    }

@Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("post interceptor ...");
        HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
    }

@Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("after interceptor ...");
        HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}

```

### BookController

接口实现类

```java
package com.bdm.controller;

import com.bdm.domain.Book;
import com.bdm.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.List;

/**
 * @code Description
 * @code author 本当迷
 * @code date 2022/8/1-7:47
 */
@RestController
@RequestMapping("/books")
public class BookController {

@Autowired
    private BookService bookService;

@PostMapping
    public Result save(@RequestBody Book book) {

final boolean flag = bookService.save(book);
        return new Result(flag ? Code.SAVE_OK : Code.SAVE_ERR, flag);
    }

@PutMapping
    public Result update(@RequestBody Book book) {

final boolean flag = bookService.update(book);
        return new Result(flag ? Code.UPDATE_OK : Code.UPDATE_ERR, flag);

}

@DeleteMapping("/{id}")
    public Result delete(@PathVariable Integer id) {
        System.out.println(id);
        final boolean flag = bookService.deleteById(id);
        return new Result(flag ? Code.DELETE_OK : Code.DELETE_ERR, flag);

}

@GetMapping("/{id}")

public Result getById(@PathVariable  Integer id) {
        final Book book = bookService.getById(id);
        Integer code = book != null ? Code.GET_OK : Code.GET_ERR;
        String msg = book != null ? "" : "数据查询失败，请重试";

return new Result(code, book, msg);

}

@GetMapping
    public Result getAll() {
        final List<Book> books = bookService.getAll();
        Integer code = books != null ? Code.GET_OK : Code.GET_ERR;
        String msg = books != null ? "" : "数据查询失败，请重试";
        return new Result(code, books, msg);
    }

}

```

### Code

状态码，用来判别接口返回的成功与失败

```java
package com.bdm.controller;

/**
 * @code Description
 * @code author 本当迷
 * @code date 2022/8/1-11:39
 */
public class Code {
    public static final int SAVE_OK = 20011;
    public static final int DELETE_OK = 20021;
    public static final int UPDATE_OK = 20031;
    public static final int GET_OK = 20041;

public static final int SAVE_ERR = 20010;
    public static final int DELETE_ERR = 20020;
    public static final int UPDATE_ERR = 20030;
    public static final int GET_ERR = 20040;

public static final int SYSTEM_ERR = 50001;
    public static final int BUSINESS_ERR = 50002;
  
    public static final int SYSTEM_UNKNOWN_ERR = 59999;

}

```

### ProjectExceptionAdvice

处理中央异常的关键类，全部的异常都会集中于此

```java
package com.bdm.controller;

import com.bdm.exception.BusinessException;
import com.bdm.exception.SystemException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;

/**
 * @code Description
 * @code author 本当迷
 * @code date 2022/8/1-12:12
 */

@RestControllerAdvice
public class ProjectExceptionAdvice {

@ExceptionHandler(SystemException.class)
    public Result doSystemException(SystemException ex){
        // 记录日志
        // 发送消息给运维
        // 发送邮件给开发人员
        System.out.println("系统异常");
        return new Result(ex.getCode(), null, ex.getMessage());
    }

@ExceptionHandler(BusinessException.class)
    public Result doBusinessException(BusinessException ex){
        System.out.println("业务异常");
        return new Result(ex.getCode(), null, ex.getMessage());
    }

@ExceptionHandler(Exception.class)
    public Result doException(Exception ex){

// 记录日志
        // 发送消息给运维
        // 发送邮件给开发人员
        System.out.println("其他异常");
        return new Result(Code.SYSTEM_UNKNOWN_ERR, null, "系统繁忙，请稍后再试！");
    }
}

```

### Result

返回给前端的统一格式

```java
package com.bdm.controller;

/**
 * @code Description
 * @code author 本当迷
 * @code date 2022/8/1-10:17
 */
public class Result {
    private Object data;
    private Integer code;
    private String msg;

public Result() {
    }

public Result( Integer code, Object data) {
        this.data = data;
        this.code = code;
    }

public Result(Integer code, Object data, String msg) {
        this.data = data;
        this.code = code;
        this.msg = msg;
    }

public Object getData() {
        return data;
    }

public void setData(Object data) {
        this.data = data;
    }

public Integer getCode() {
        return code;
    }

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

public String getMsg() {
        return msg;
    }

public void setMsg(String msg) {
        this.msg = msg;
    }

@Override
    public String toString() {
        return "Result{" +
                "data=" + data +
                ", code=" + code +
                ", msg='" + msg + '\'' +
                '}';
    }
}

```

## dao数据库交互

### BookDao

与数据库交互的sql语句

```java
package com.bdm.dao;

import com.bdm.domain.Book;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;

import java.util.List;

/**
 * @code Description
 * @code author 本当迷
 * @code date 2022/8/1-7:45
 */
public interface BookDao {

@Insert("insert into tbl_book values(null, #{type}, #{name}, #{description})")
    int save(Book book);

@Update("update tbl_book set type = #{type}, name = #{name}, description = #{description} where id = #{id}")
    int update(Book book);

@Delete("delete from tbl_book where id = #{id}")
    int delete(Integer id);

@Select("select * from tbl_book where id = #{id}")
    Book getById(Integer id);

@Select("select * from tbl_book")
    List<Book>getAll();

}

```

## domain实体类

### Book

实体类

```java
package com.bdm.domain;

/**
 * @code Description
 * @code author 本当迷
 * @code date 2022/8/1-7:43
 */
public class Book {
    private Integer id;
    private String type;
    private String name;
    private String description;

public Book() {
    }

public Book(Integer id, String type, String name, String description) {
        this.id = id;
        this.type = type;
        this.name = name;
        this.description = description;
    }

public Integer getId() {
        return id;
    }

public void setId(Integer id) {
        this.id = id;
    }

public String getType() {
        return type;
    }

public void setType(String type) {
        this.type = type;
    }

public String getName() {
        return name;
    }

public void setName(String name) {
        this.name = name;
    }

public String getDescription() {
        return description;
    }

public void setDescription(String description) {
        this.description = description;
    }

@Override
    public String toString() {
        return "Book{" +
                "id=" + id +
                ", type='" + type + '\'' +
                ", name='" + name + '\'' +
                ", description='" + description + '\'' +
                '}';
    }
}

```

## exception自定义异常

### BusinessException

业务异常

```java
package com.bdm.exception;

/**
 * @code Description
 * @code author 本当迷
 * @code date 2022/8/1-12:25
 */
public class BusinessException extends RuntimeException{
    private Integer code;

public Integer getCode() {
        return code;
    }

public BusinessException(Integer code, String message ) {
        super(message);
        this.code = code;
    }

public BusinessException(Integer code, String message, Throwable cause) {
        super(message, cause);
        this.code = code;
    }

}

```

### SystemException

系统异常

```java
package com.bdm.exception;

/**
 * @code Description
 * @code author 本当迷
 * @code date 2022/8/1-12:25
 */
public class SystemException extends RuntimeException{
    private Integer code;

public Integer getCode() {
        return code;
    }

public SystemException(Integer code, String message ) {
        super(message);
        this.code = code;
    }

public SystemException( Integer code, String message, Throwable cause) {
        super(message, cause);
        this.code = code;
    }

}

```

## service业务相关

### BookServiceImpl

接受数据库的数据，经过处理后再返回出去

```java
package com.bdm.service.impl;

import com.bdm.controller.Code;
import com.bdm.dao.BookDao;
import com.bdm.domain.Book;
import com.bdm.exception.BusinessException;
import com.bdm.exception.SystemException;
import com.bdm.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * @code Description
 * @code author 本当迷
 * @code date 2022/8/1-7:46
 */
@Service
public class BookServiceImpl implements BookService {

@Autowired
    private BookDao bookDao;

@Override
    public boolean save(Book book) {
        final int save = bookDao.save(book);
        return save > 0;
    }

@Override
    public boolean update(Book book) {
        final int update = bookDao.update(book);
        return update > 0;
    }

@Override
    public boolean deleteById(Integer id) {
        final int delete = bookDao.delete(id);
        return delete > 0;
    }

@Override
    public Book getById(Integer id) {
        if(id < 1){
            System.out.println("id = 1");
            throw new BusinessException(Code.BUSINESS_ERR, "请不要恶意访问，否则将追究责任！");
        }

return bookDao.getById(id);
    }

@Override
    public List<Book> getAll() {
        return bookDao.getAll();
    }
}

```

### Bookservice

接口规范

```java
package com.bdm.service;

import java.util.List;

/**
 * @code Description
 * @code author 本当迷
 * @code date 2022/8/1-7:46
 */
@Transactional
public interface BookService {

/**
     * 保存
     * @param book
     * @return
     */
    boolean save(Book book);

/**
     * 修改
     * @param book
     * @return
     */
    boolean update(Book book);

/**
     * 删除
     * @param id
     * @return
     */
    boolean deleteById(Integer id);

/**
     * 根据id查询
     * @param id
     * @return
     */
    Book getById(Integer id);

/**
     * 查询全部
     * @return
     */
    List<Book> getAll();
}

```

最后修改：2022 年 08 月 01 日

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【java】SSM整合

本当迷 • 2022 年 08 月 01 日

## 总结前：

## 总结

### 大概的项目框架

![](https://www.bdmcom.cn/usr/uploads/2022/08/2399837762.png)

## config配置类

### jdbcConfig

连接数据库的基本信息

```java
package com.bdm.config;

import javax.sql.DataSource;

/**
 * @code Description
 * @code author 本当迷
 * @code date 2022/8/1-6:57
 */
public class JdbcConfig {

@Value("${jdbc.driver}")
    private String driver;

@Value("${jdbc.url}")
    private String url;

@Value("${jdbc.password}")
    private String password;

@Value("${jdbc.username}")
    private String username;

}

```

### MyBatisConfig

配置mybatis映射的路径与类型

```java
package com.bdm.config;

import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.context.annotation.Bean;

import javax.sql.DataSource;
import javax.xml.crypto.Data;

```

### servletConfig

配置过滤器

```java
package com.bdm.config;

import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;

@Override
    protected Class<?>[] getServletConfigClasses() {
        return new Class[]{SpringMvcConfig.class};
    }

@Override
    protected String[] getServletMappings() {
        return new String[]{"/"};
    }
}

```

### SpringConfig

spring的核心配置类

```java
package com.bdm.config;

```

### SpringMvcConfig

SpringMvc的核心配置类与拦截器

```java
package com.bdm.config;

@Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(projectInterceptor).addPathPatterns("/books", "/books/*");
    }
}

```

## controller接口管理

### ProjectInterceptor

拦截器关键实现

```java
package com.bdm.controller.interceptor;

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

```

### BookController

接口实现类

```java
package com.bdm.controller;

import com.bdm.domain.Book;
import com.bdm.service.BookService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.List;

/**
 * @code Description
 * @code author 本当迷
 * @code date 2022/8/1-7:47
 */
@RestController
@RequestMapping("/books")
public class BookController {

@Autowired
    private BookService bookService;

@PostMapping
    public Result save(@RequestBody Book book) {

final boolean flag = bookService.save(book);
        return new Result(flag ? Code.SAVE_OK : Code.SAVE_ERR, flag);
    }

@PutMapping
    public Result update(@RequestBody Book book) {

final boolean flag = bookService.update(book);
        return new Result(flag ? Code.UPDATE_OK : Code.UPDATE_ERR, flag);

}

@GetMapping("/{id}")

return new Result(code, book, msg);

}

```

### Code

状态码，用来判别接口返回的成功与失败

```java
package com.bdm.controller;

public static final int SAVE_ERR = 20010;
    public static final int DELETE_ERR = 20020;
    public static final int UPDATE_ERR = 20030;
    public static final int GET_ERR = 20040;

public static final int SYSTEM_ERR = 50001;
    public static final int BUSINESS_ERR = 50002;
  
    public static final int SYSTEM_UNKNOWN_ERR = 59999;

}

```

### ProjectExceptionAdvice

处理中央异常的关键类，全部的异常都会集中于此

```java
package com.bdm.controller;

/**
 * @code Description
 * @code author 本当迷
 * @code date 2022/8/1-12:12
 */

@RestControllerAdvice
public class ProjectExceptionAdvice {

@ExceptionHandler(Exception.class)
    public Result doException(Exception ex){

```

### Result

返回给前端的统一格式

```java
package com.bdm.controller;

/**
 * @code Description
 * @code author 本当迷
 * @code date 2022/8/1-10:17
 */
public class Result {
    private Object data;
    private Integer code;
    private String msg;

public Result() {
    }

public Result( Integer code, Object data) {
        this.data = data;
        this.code = code;
    }

public Result(Integer code, Object data, String msg) {
        this.data = data;
        this.code = code;
        this.msg = msg;
    }

public Object getData() {
        return data;
    }

public void setData(Object data) {
        this.data = data;
    }

public Integer getCode() {
        return code;
    }

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

public String getMsg() {
        return msg;
    }

public void setMsg(String msg) {
        this.msg = msg;
    }

```

## dao数据库交互

### BookDao

与数据库交互的sql语句

```java
package com.bdm.dao;

import java.util.List;

/**
 * @code Description
 * @code author 本当迷
 * @code date 2022/8/1-7:45
 */
public interface BookDao {

@Insert("insert into tbl_book values(null, #{type}, #{name}, #{description})")
    int save(Book book);

@Update("update tbl_book set type = #{type}, name = #{name}, description = #{description} where id = #{id}")
    int update(Book book);

@Delete("delete from tbl_book where id = #{id}")
    int delete(Integer id);

@Select("select * from tbl_book where id = #{id}")
    Book getById(Integer id);

@Select("select * from tbl_book")
    List<Book>getAll();

}

```

## domain实体类

### Book

实体类

```java
package com.bdm.domain;

public Book() {
    }

public Book(Integer id, String type, String name, String description) {
        this.id = id;
        this.type = type;
        this.name = name;
        this.description = description;
    }

public Integer getId() {
        return id;
    }

public void setId(Integer id) {
        this.id = id;
    }

public String getType() {
        return type;
    }

public void setType(String type) {
        this.type = type;
    }

public String getName() {
        return name;
    }

public void setName(String name) {
        this.name = name;
    }

public String getDescription() {
        return description;
    }

public void setDescription(String description) {
        this.description = description;
    }

```

## exception自定义异常

### BusinessException

业务异常

```java
package com.bdm.exception;

/**
 * @code Description
 * @code author 本当迷
 * @code date 2022/8/1-12:25
 */
public class BusinessException extends RuntimeException{
    private Integer code;

public Integer getCode() {
        return code;
    }

public BusinessException(Integer code, String message ) {
        super(message);
        this.code = code;
    }

public BusinessException(Integer code, String message, Throwable cause) {
        super(message, cause);
        this.code = code;
    }

}

```

### SystemException

系统异常

```java
package com.bdm.exception;

/**
 * @code Description
 * @code author 本当迷
 * @code date 2022/8/1-12:25
 */
public class SystemException extends RuntimeException{
    private Integer code;

public Integer getCode() {
        return code;
    }

public SystemException(Integer code, String message ) {
        super(message);
        this.code = code;
    }

public SystemException( Integer code, String message, Throwable cause) {
        super(message, cause);
        this.code = code;
    }

}

```

## service业务相关

### BookServiceImpl

接受数据库的数据，经过处理后再返回出去

```java
package com.bdm.service.impl;

import java.util.List;

/**
 * @code Description
 * @code author 本当迷
 * @code date 2022/8/1-7:46
 */
@Service
public class BookServiceImpl implements BookService {

@Autowired
    private BookDao bookDao;

@Override
    public boolean save(Book book) {
        final int save = bookDao.save(book);
        return save > 0;
    }

@Override
    public boolean update(Book book) {
        final int update = bookDao.update(book);
        return update > 0;
    }

@Override
    public boolean deleteById(Integer id) {
        final int delete = bookDao.delete(id);
        return delete > 0;
    }

return bookDao.getById(id);
    }

@Override
    public List<Book> getAll() {
        return bookDao.getAll();
    }
}

```

### Bookservice

接口规范

```java
package com.bdm.service;

import java.util.List;

/**
 * @code Description
 * @code author 本当迷
 * @code date 2022/8/1-7:46
 */
@Transactional
public interface BookService {

/**
     * 保存
     * @param book
     * @return
     */
    boolean save(Book book);

/**
     * 修改
     * @param book
     * @return
     */
    boolean update(Book book);

/**
     * 删除
     * @param id
     * @return
     */
    boolean deleteById(Integer id);

/**
     * 根据id查询
     * @param id
     * @return
     */
    Book getById(Integer id);

/**
     * 查询全部
     * @return
     */
    List<Book> getAll();
}

```

【java】SSM整合

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【java】SSM整合

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【java】SSM整合

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