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北京做网站黑名单,艺术培训学校招生方案,wordpress menu 插件,企业法治建设工作计划目录 ssm框架整合 第一步：指定打包方式和导入所需要的依赖 打包方法：war springMVC所需依赖 解析json依赖 mybatis依赖 数据库驱动依赖 druid数据源依赖 junit依赖 第二步：导入tomcat插件 第三步：编写配置类 SpringCon…

目录

ssm框架整合

第一步：指定打包方式和导入所需要的依赖

打包方法：war

springMVC所需依赖

解析json依赖

mybatis依赖

数据库驱动依赖

druid数据源依赖

junit依赖

第二步：导入tomcat插件

 第三步：编写配置类

SpringConfig配置类

JdbcConfig配置类

 MybatisConfig配置类

SpringMvcConfig配置类

ServletContainerInitConfig配置类

注意点：

第四步：准备数据库并写对应的pojo类型

第五步：编写dao层

 第六步：编写service层

 第七步：编写controller层

第八步：封装数据

响应码类

封装结果类

修改后的Controller

报错：这里我使用postman测试时，报错 No converter for [class com.hhh.pojo.vo.Result] with preset Content-Type 'null'

异常处理器

业务异常

 系统异常

异常处理器

拦截器 

如何定义拦截器

1.定义一个拦截器类，并实现HandlerInterceptor

2.配置加载拦截器

3.让SpringMVC加载此配置类

 拦截器链

ssm框架整合

先自己创建Maven工程

第一步：指定打包方式和导入所需要的依赖

打包方法：war

    <groupId>com.hhh</groupId><artifactId>spring_day7_ssm2</artifactId><version>1.0-SNAPSHOT</version>
<!--    使用war方式进行打包--><packaging>war</packaging>

springMVC所需依赖

<!--        springMVC依赖--><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>5.2.10.RELEASE</version></dependency><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>3.1.0</version><scope>provided</scope></dependency>

解析json依赖

<!--        json解析--><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.9.0</version></dependency>

mybatis依赖

<!--        mybatis依赖--><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.5</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>5.2.10.RELEASE</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>2.1.0</version></dependency>

数据库驱动依赖

<!--        数据库驱动--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.13</version></dependency>

druid数据源依赖

<!--        druid--><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.16</version></dependency>

junit依赖

<!--        junit--><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId><version>5.2.10.RELEASE</version></dependency>

第二步：导入tomcat插件

 <build><plugins><plugin><groupId>org.apache.tomcat.maven</groupId><artifactId>tomcat7-maven-plugin</artifactId><version>2.1</version><configuration><!-- 指定端口 --><port>8080</port><!-- 请求路径 --><path>/</path><uriEncoding>utf-8</uriEncoding><!--                    &lt;!&ndash;这个名称需要，在maven插件中显示应用名称&ndash;&gt;--><!--                    <server>tomcat7</server>--></configuration></plugin></plugins></build>

 

完整的pom.xml文件如下

<?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>com.hhh</groupId><artifactId>spring_day7_ssm2</artifactId><version>1.0-SNAPSHOT</version>
<!--    使用war方式进行打包--><packaging>war</packaging><properties><maven.compiler.source>21</maven.compiler.source><maven.compiler.target>21</maven.compiler.target><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding></properties><dependencies>
<!--        springMVC依赖--><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>5.2.10.RELEASE</version></dependency><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>3.1.0</version><scope>provided</scope></dependency>
<!--        json解析--><dependency><groupId>com.fasterxml.jackson.core</groupId><artifactId>jackson-databind</artifactId><version>2.9.0</version></dependency>
<!--        mybatis依赖--><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.5</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>5.2.10.RELEASE</version></dependency><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>2.1.0</version></dependency>
<!--        数据库驱动--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.13</version></dependency>
<!--        druid--><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.16</version></dependency>
<!--        junit--><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId><version>5.2.10.RELEASE</version></dependency></dependencies><build><plugins><plugin><groupId>org.apache.tomcat.maven</groupId><artifactId>tomcat7-maven-plugin</artifactId><version>2.1</version><configuration><!-- 指定端口 --><port>8080</port><!-- 请求路径 --><path>/</path><uriEncoding>utf-8</uriEncoding><!--                    &lt;!&ndash;这个名称需要，在maven插件中显示应用名称&ndash;&gt;--><!--                    <server>tomcat7</server>--></configuration></plugin></plugins></build></project>

 第三步：编写配置类

SpringConfig配置类

@Configuration
@ComponentScan({"com.hhh.dao","com.hhh.service"})
@PropertySource("classpath:jdbc.properties")//导入外部文件
@Import({JdbcConfig.class, MybatisConfig.class})//加载外部配置类
@EnableTransactionManagement//开启事务功能
public class SpringConfig {
}

JdbcConfig配置类

//管理第三方技术 这个类写数据源和事务处理器
public class JdbcConfig {@Value("${jdbc.driver}")private String driver;@Value("${jdbc.url}")private String url;@Value("${jdbc.username}")private String name;@Value("${jdbc.password}")private String password;@Beanpublic DataSource dataSource(){DruidDataSource druidDataSource = new DruidDataSource();druidDataSource.setDriverClassName(driver);druidDataSource.setUrl(url);druidDataSource.setUsername(name);druidDataSource.setPassword(password);return druidDataSource;}@Beanpublic PlatformTransactionManager manager(DataSource dataSource){//spring会根据类型自动注入相同类型的beanDataSourceTransactionManager dataSourceTransactionManager = new DataSourceTransactionManager();dataSourceTransactionManager.setDataSource(dataSource);return dataSourceTransactionManager;}
}

 MybatisConfig配置类

public class MybatisConfig {@Beanpublic SqlSessionFactoryBean sqlSessionFactoryBean(DataSource dataSource){SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();sqlSessionFactoryBean.setDataSource(dataSource);sqlSessionFactoryBean.setTypeAliasesPackage("com.hhh.pojo");//设置pojo类别名return sqlSessionFactoryBean;}@Beanpublic MapperScannerConfigurer mapperScannerConfigurer(){MapperScannerConfigurer mapperScannerConfigurer = new MapperScannerConfigurer();mapperScannerConfigurer.setBasePackage("com.hhh.dao");//扫描dao层，并帮dao层的接口类创建代理对象beanreturn mapperScannerConfigurer;}
}

SpringMvcConfig配置类

@Configuration
@ComponentScan("com.hhh.controller")
@EnableWebMvc//开启辅助功能
public class SpringMvcConfig {
}

ServletContainerInitConfig配置类

public class ServletContainerInitConfig extends AbstractAnnotationConfigDispatcherServletInitializer {//加载spring核心配置类@Overrideprotected Class<?>[] getRootConfigClasses() {return new Class[]{SpringConfig.class};}//加载springMVC核心配置类@Overrideprotected Class<?>[] getServletConfigClasses() {return new Class[]{SpringMvcConfig.class};}//设置哪些请求路径交给springMVC管理@Overrideprotected String[] getServletMappings() {return new String[]{"/"};}//设置post中文请求乱码@Overrideprotected Filter[] getServletFilters() {CharacterEncodingFilter characterEncodingFilter = new CharacterEncodingFilter();characterEncodingFilter.setEncoding("utf-8");return new Filter[]{characterEncodingFilter};}
}

注意点：

SpringMvc核心配置类和Spring配置类不能互相扫描，假如@Import({JdbcConfig.class, MybatisConfig.class})多了com.hhh.config,就会报错

 Failed to instantiate [org.springframework.web.servlet.HandlerMapping]: Factory method 'resourceHandlerMapping' threw exception; nested exception is java.lang.IllegalStateException: No ServletContext set

编写完配置类之后我们先启动项目看看，会不会出错

注意：启动之前现在main目录下创建一个webapp目录

 没有问题

第四步：准备数据库并写对应的pojo类型

 

public class Book {private Integer id;private String name;private String description;private Integer score;@Overridepublic String toString() {return "Book{" +"id=" + id +", name='" + name + '\'' +", description='" + description + '\'' +", score=" + score +'}';}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}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;}public Integer getScore() {return score;}public void setScore(Integer score) {this.score = score;}}

第五步：编写dao层

由于修改操作需要id和Book类对象，所以重新写一个pojo类

public class UpdateBook {Integer id;Book book;@Overridepublic String toString() {return "UpdateBook{" +"id=" + id +", book=" + book +'}';}public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public Book getBook() {return book;}public void setBook(Book book) {this.book = book;}
}


//这里不用写@Repository注解，因为MybatisConfig会扫描这一个包下的所有接口类，并创建代理对象
public interface BookDao {//新增操作@Insert("insert into book(name, description, score) VALUE (#{name},#{description},#{score});")@Options(useGeneratedKeys = true,keyColumn = "id",keyProperty = "id")//设置主键回填Integer save(Book book);//查询全部@Select("select * from book;")List<Book> getAll();//查询某一个@Select("select * from book where id=#{id};")Book getById(Integer id);//删除@Delete("delete from book where id=#{id};")Integer deleteById(Integer id);//修改/*@Update("update book set name=#{book.name},description=#{book.description},score=#{book.score} where id=#{id};")Integer updateById(@Param("id") Integer id, @Param("book") Book book);*/@Update("update book set name=#{book.name},description=#{book.description},score=#{book.score} where id=#{id};")Integer updateById(UpdateBook u);
}

 第六步：编写service层

BookService接口

@Transactional//开启事务管理
public interface BookService {//新增操作Boolean save(Book book);//查询全部List<Book> getAll();//查询某一个Book getById(Integer id);//删除Boolean deleteById(Integer id);//修改Boolean updateById(UpdateBook updateBook);
}

BookServiceImpl实现类

@Service
public class BookServiceImpl implements BookService {@Autowiredprivate BookDao bookDao;@Overridepublic Boolean save(Book book) {return bookDao.save(book)>0;//大于0为真}@Overridepublic List<Book> getAll() {return bookDao.getAll();}@Overridepublic Book getById(Integer id) {return bookDao.getById(id);}@Overridepublic Boolean deleteById(Integer id) {return bookDao.deleteById(id)>0;}@Overridepublic Boolean updateById(UpdateBook updateBook) {return bookDao.updateById(updateBook)>0;}
}

测试一下

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = SpringConfig.class)//加载spring核心配置类
public class BookServiceTest {@Autowiredprivate BookService bookService;@Testpublic void testGetAll(){List<Book> list = bookService.getAll();System.out.println(list);}@Testpublic void  testGetById(){Book book= bookService.getById(2);System.out.println(book);}@Testpublic void testSave(){Book book = new Book();book.setName("hh");book.setDescription("aa");book.setScore(90);Boolean aBoolean = bookService.save(book);System.out.println(aBoolean);//trueSystem.out.println("id="+book.getId());//11}@Testpublic void testUpdate(){Book book = new Book();book.setName("hhh");book.setDescription("aaa");book.setScore(70);UpdateBook updateBook = new UpdateBook();updateBook.setBook(book);updateBook.setId(9);Boolean b = bookService.updateById(updateBook);System.out.println(b);}@Testpublic void testDelete(){Boolean b = bookService.deleteById(11);System.out.println(b);}
}

 全部正确

 第七步：编写controller层

/*@ResponseBody
@Controller*/
@RestController
@RequestMapping(value = "/books",produces = "text/html;charset=utf-8")
public class BookController {@Autowiredprivate BookService bookService;@PostMappingpublic String save(@RequestBody Book book){//解析json对象Boolean b = bookService.save(book);return b?"保存成功":"保存失败";//return "保存成功";}@GetMappingpublic List<Book>getAll(){return bookService.getAll();}@GetMapping("/{id}")public Book getById(@PathVariable Integer id){//从路径中获取值return bookService.getById(id);}@PutMappingpublic String update(@RequestBody UpdateBook book){Boolean b = bookService.updateById(book);return b?"修改成功":"修改失败";}@DeleteMapping("/{id}")public String delete(@PathVariable Integer id){//从路径中获取值Boolean b = bookService.deleteById(id);return b?"删除成功":"删除失败";}
}

使用postman测试

 完全正确

第八步：封装数据

响应码类

public class Code {public  static final Integer SAVE_OK=10010;public static final Integer UPDATE_OK=10020;public static final Integer DELETE_OK=10030;public  static final Integer SELECT_OK=10040;public  static final Integer SAVE_ERR=10011;public  static final Integer UPDATE_ERR=10021;public  static final Integer DELETE_ERR=10031;public  static final Integer SELECT_ERR=10041;}

封装结果类

public class Result {private Integer code;//响应码private Object data;//响应数据private String msg;//响应信息，可有可无@Overridepublic String toString() {return "Result{" +"code=" + code +", data=" + data +", msg='" + msg + '\'' +'}';}public Result(Integer code, Object data, String msg) {this.code = code;this.data = data;this.msg = msg;}public Result(Integer code, Object data) {this.code = code;this.data = data;}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;}
}

修改后的Controller

/*@ResponseBody
@Controller*/
@RestController
@RequestMapping(value = "/books",produces = "application/json;charset=utf-8")
public class BookController {@Autowiredprivate BookService bookService;@PostMappingpublic Result save(@RequestBody Book book){//解析json对象Boolean b = bookService.save(book);Integer code=b? Code.SAVE_OK:Code.SAVE_ERR;String msg=b?"新增成功":"新增失败";return new Result(code,b,msg);}@GetMappingpublic Result getAll(){List<Book> bookList = bookService.getAll();Integer code=bookList!=null?Code.SELECT_OK:Code.SELECT_ERR;String msg=bookList!=null?"查询成功":"查询失败";return new Result(code,bookList,msg);}@GetMapping("/{id}")public Result getById(@PathVariable Integer id){//从路径中获取值Book book = bookService.getById(id);Integer code=book!=null?Code.SELECT_OK:Code.SELECT_ERR;String msg=book!=null?"查询成功":"查询失败";return new Result(code,book,msg);}@PutMappingpublic Result update(@RequestBody UpdateBook book){Boolean b = bookService.updateById(book);Integer code=b? Code.UPDATE_OK:Code.UPDATE_ERR;String msg=b?"修改成功":"修改失败";return new Result(code,b,msg);}@DeleteMapping("/{id}")public Result delete(@PathVariable Integer id){//从路径中获取值Boolean b = bookService.deleteById(id);Integer code=b? Code.DELETE_OK:Code.DELETE_ERR;String msg=b?"删除成功":"删除失败";return new Result(code,b,msg);}
}

报错：
这里我使用postman测试时，报错 No converter for [class com.hhh.pojo.vo.Result] with preset Content-Type 'null'

解决方法：
把@RequestMapping(value = "/books",produces = {"text/html;charset=UTF-8"})

改成

@RequestMapping(value = "/books",produces = {"application/json;charset=UTF-8"})

异常处理器

 我们可以把出现的异常封装成结果类，返回给前端

@RestControllerAdvice
//包好了@ResponseBody，@Component注解
public class ProjectExceptionAdvice {@ExceptionHandler(Exception.class)//告诉spring这是处理异常的，负责处理Exception异常public Result doException(Exception e){return new Result(Code.ERR,null,"项目出错");}
}

还需要在Spring核心配置类中扫描到这个包，如果没有写，异常处理器就不会生效

@Configuration
@ComponentScan({"com.hhh.dao","com.hhh.service","com.hhh.exception"})
@PropertySource("classpath:jdbc.properties")//导入外部文件
@Import({JdbcConfig.class, MybatisConfig.class})//加载外部配置类
@EnableTransactionManagement//开启事务功能
public class SpringConfig {
}

我们随便写一个异常

结果：

 我们可以把我们常见的异常分成

业务异常和系统出错异常

 public static final Integer ERR=0;public static final Integer BUSINESS_ERR=20101;public static final Integer SYSTEM_ERR=20202;

先添加三个code编码

业务异常

public class BusinessException extends RuntimeException{private Integer 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;}public Integer getCode() {return code;}public void setCode(Integer code) {this.code = code;}
}

 系统异常

public class SystemException extends RuntimeException{private Integer 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;}public Integer getCode() {return code;}public void setCode(Integer code) {this.code = code;}
}

异常处理器


@RestControllerAdvice
//包好了@ResponseBody，@Component注解
public class ProjectExceptionAdvice {@ExceptionHandler(BusinessException.class)//处理BusinessException异常public Result doBusinessException(BusinessException e){//接收程序传过来的异常return new Result(e.getCode(),null,e.getMessage());}@ExceptionHandler(SystemException.class)//处理SystemException异常public Result doSystemException(SystemException e){return new Result(e.getCode(),null,e.getMessage());}@ExceptionHandler(Exception.class)//告诉spring这是处理异常的，负责处理Exception异常public Result doException(Exception e){return new Result(Code.ERR,null,"项目出错");}
}

测试

成功：

拦截器 

拦截器是一种动态拦截方法的机制

作用：

  • 在指定方法调用前后执行预先设定后的代码
  • 阻止原始方法的执行 

如何定义拦截器

1.定义一个拦截器类，并实现HandlerInterceptor

@Component//交给容器管理
public class MyInterceptor implements HandlerInterceptor {@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {System.out.println("preHandle");//执行原方法之前return true;//返回true才能放行去访问controller}@Overridepublic void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {System.out.println("postHandler");}@Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {System.out.println("afterCompletion");}
}

spring核心配置类扫描该自定义的拦截器类，并生成bean

@Configuration
@ComponentScan({"com.hhh.dao","com.hhh.service","com.hhh.exception","com.hhh.interceptor"})
@PropertySource("classpath:jdbc.properties")//导入外部文件
@Import({JdbcConfig.class, MybatisConfig.class})//加载外部配置类
@EnableTransactionManagement//开启事务功能
public class SpringConfig {
}

2.配置加载拦截器

public class SpringWebSupport implements WebMvcConfigurer {@Autowiredprivate MyInterceptor myInterceptor;@Overridepublic void addInterceptors(InterceptorRegistry registry) {registry.addInterceptor(myInterceptor).addPathPatterns("/books");//设置拦截的路径}
}

3.让SpringMVC加载此配置类

@Configuration
@ComponentScan("com.hhh.controller")
@EnableWebMvc//开启辅助功能
@Import(SpringWebSupport.class)
public class SpringMvcConfig {
}

结果：

 拦截器链

  • 当配置多个拦截器时，形成拦截器链
  • 拦截器链的运行顺序参照拦截器添加的顺序为准
  • 当拦截器中出现对原始拦截器的拦截（返回false），后面的拦截器均终止运行(后面的preHandler方法，所有postHandle方法和包括自身的afterCompletion方法都不执行)
  • 当拦截器中断，仅运行配置在前面的拦截器的afterCompletion

添加其他的拦截器

 加载这些拦截器

public class SpringWebSupport implements WebMvcConfigurer {@Autowiredprivate MyInterceptor myInterceptor;@Autowiredprivate MyInterceptor2 myInterceptor2;@Autowiredprivate MyInterceptor3 myInterceptor3;@Overridepublic void addInterceptors(InterceptorRegistry registry) {registry.addInterceptor(myInterceptor).addPathPatterns("/books","/books/*");//设置拦截的路径registry.addInterceptor(myInterceptor2).addPathPatterns("/books","/books/*");registry.addInterceptor(myInterceptor3).addPathPatterns("/books","/books/*");}
}

执行的顺序就是加载的顺序

结果：

http://www.khdw.cn/news/70343.html

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