SSM框架搭建 - 孤独时代

项目结构

ssm框架

SpringConfig

package com.itheima.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;

@Configuration
@ComponentScan({"com.itheima.service"})
@PropertySource("classpath:jdbc.properties")
@Import({JdbcConfig.class, MybatisConfig.class})
@EnableTransactionManagement
public class SpringConfig {
}
//注意扫描properties文件的写法

SpringMvcConfig

这种写法把SpringMVC的配置文件和放行静态资源, 添加拦截器写在一起了
更方便, 但是代码侵入性比较强
其实可以单独拆出来一个SpringMvcSupport类继承WebMvcConfigurationSupport(一个抽象的配置类)

package com.itheima.config;

import com.itheima.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;

@Configuration
@ComponentScan({"com.itheima.controller", "com.itheima.config"})
@EnableWebMvc
public class SpringMvcConfig implements WebMvcConfigurer {

    //放行静态资源
    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
        registry.addResourceHandler("/css/**").addResourceLocations("/css/");
        registry.addResourceHandler("/js/**").addResourceLocations("/js/");
        registry.addResourceHandler("/pages/**").addResourceLocations("/pages/");
        registry.addResourceHandler("/plugins/**").addResourceLocations("/plugins/");
    }
    //配置拦截器
    @Autowired
    private ProjectInterceptor projectInterceptor;

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

整合MyBatis

首先配置数据源 JdbcCoinfig

package com.itheima.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;

public class JdbcConfig {

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

    @Bean
    public DataSource dataSource() {

        DruidDataSource ds = new DruidDataSource();
        ds.setDriverClassName(driver);
        ds.setUrl(url);
        ds.setUsername(username);
        ds.setPassword(password);
        return ds;
    }

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

}

整合MyBatis

创建SqlSessionFactoryBean(配置数据源dataSource和别名)
和扫描dao类

package com.itheima.config;

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

import javax.sql.DataSource;

public class MybatisConfig {

    @Bean
    public SqlSessionFactoryBean sessionFactory(DataSource dataSource) {
        SqlSessionFactoryBean factoryBean = new SqlSessionFactoryBean();
        factoryBean.setDataSource(dataSource);
        factoryBean.setTypeAliasesPackage("com.itheima.domain");
        return factoryBean;
    }

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

}

Spring初始化ServletContainerConfig

package com.itheima.config;

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

import javax.servlet.Filter;

public class ServletContainerConfig 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[]{"/"};
    }

    //乱码处理
    @Override
    protected Filter[] getServletFilters() {
        CharacterEncodingFilter filter = new CharacterEncodingFilter();
        filter.setEncoding("UTF-8");
        return new Filter[]{filter};
    }
}

可选:单独拆出WebMvcConfigurationSupport

package com.itheima.config;

import com.itheima.controller.interceptor.ProjectInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;

@Configuration
public class SpringMvcSupport extends WebMvcConfigurationSupport {

    @Autowired
    private ProjectInterceptor projectInterceptor;

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

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

自定义异常

BusinessException

package com.itheima.exception;

public class BusinessException extends RuntimeException {
 private Integer code;//异常编号

 public Integer getCode() {
     return code;
 }

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

package com.itheima.exception;

public class SystemException extends RuntimeException {
    private Integer code;//异常编号

    public Integer getCode() {
        return code;
    }

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

}

拦截异常ProjectExceptionAdvice

package com.itheima.controller;

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

@RestControllerAdvice
public class ProjectExceptionAdvice {

    @ExceptionHandler(SystemException.class)
    public Result doSystemException(SystemException e){
        //记录日志
        //发送消息给运维
        //发送邮件给运维
        return new Result(e.getCode(), null, "系统级错误1:" + e.getMessage());
    }


    @ExceptionHandler(BusinessException.class)
    public Result doBusinessException(BusinessException e){
        return new Result(e.getCode(), null, "业务级错误2:" + e.getMessage());
    }


    @ExceptionHandler(Exception.class)
    public Result doException(Exception e){
        //记录日志
        //发送消息给运维
        //发送邮件给运维
        System.out.println("异常, 我草泥马");
        return new Result(Code.SYSTEM_UNKNOW_ERR, null, "其他错误3系统繁忙, 请稍后再试");
    }

}

自定义错误码

package com.itheima.controller;

public class Code {
    public static final Integer SAVE_OK = 20011;
    public static final Integer DELETE_OK = 20021;
    public static final Integer UPDATE_OK = 20031;
    public static final Integer GET_OK = 20041;

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

    public static final Integer SYSTEM_ERR = 50001;
    public static final Integer SYSTEM_TIMEOUT_ERR = 50002;

    public static final Integer BUSINESS_ERR = 60002;
    public static final Integer SYSTEM_UNKNOW_ERR = 59999;
}

拦截器

package com.itheima.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;

@Component
public class ProjectInterceptor implements HandlerInterceptor {

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        System.out.println("preHandle");
        return true;
    }

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

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

}

自定义协议

package com.itheima.controller;

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.code = code;
        this.data = data;
        this.msg = msg;
    }

    public Integer getCode() {
        return code;
    }

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

    public Object getData() {
        return data;
    }

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

    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 + '\'' +
                '}';
    }
}

项目结构

SpringConfig

SpringMvcConfig

整合MyBatis

Spring初始化ServletContainerConfig

可选:单独拆出WebMvcConfigurationSupport

自定义异常

拦截异常ProjectExceptionAdvice

自定义错误码

拦截器

自定义协议

评论