SSM（Spring+SpringMVC+MyBatis）框架集由Spring、MyBatis两个开源框架整合而成（SpringMVC是Spring中的部分内容）。常作为数据源较简单的web项目的框架。
创建初始化类，代替web.xml
在Servlet3.0环境中，容器会在类路径中查找实现javax.servlet.ServletContainerInitializer接口的类，
如果找到的话就用它来配置Servlet容器。 Spring提供了这个接口的实现，名为
SpringServletContainerInitializer，这个类反过来又会查找实现WebApplicationInitializer的类并将配
置的任务交给它们来完成。Spring3.2引入了一个便利的WebApplicationInitializer基础实现，名为
AbstractAnnotationConfigDispatcherServletInitializer，当我们的类扩展了
AbstractAnnotationConfigDispatcherServletInitializer并将其部署到Servlet3.0容器的时候，容器会自
动发现它，并用它来配置Servlet上下文。
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
| package com.white.mvc.config;
import org.springframework.web.filter.CharacterEncodingFilter;
import org.springframework.web.filter.HiddenHttpMethodFilter;
import org.springframework.web.servlet.support.AbstractAnnotationConfigDispatcherServletInitializer;
import javax.servlet.Filter;
//web工程的初始化类，用来代替web.xml
public class WebInit extends AbstractAnnotationConfigDispatcherServletInitializer {
/**
* 指定spring的配置类
* @return
*/
@Override
protected Class<?>[] getRootConfigClasses() {
return new Class[]{SpringConfig.class};
}
/**
* 指定springMVC的配置类
* @return
*/
@Override
protected Class<?>[] getServletConfigClasses() {
return new Class[]{WebConfig.class};
}
/**
* 指定DispatcherServlet的映射规则，即url-pattern
* @return
*/
@Override
protected String[] getServletMappings() {
return new String[]{"/"};
}
/**
* 注册过滤器
* @return
*/
@Override
protected Filter[] getServletFilters() {
CharacterEncodingFilter characterEncodingFilter = new CharacterEncodingFilter();
characterEncodingFilter.setEncoding("UTF-8");
characterEncodingFilter.setForceResponseEncoding(true);
HiddenHttpMethodFilter hiddenHttpMethodFilter = new HiddenHttpMethodFilter();
return new Filter[]{characterEncodingFilter, hiddenHttpMethodFilter};
}
}
|
创建SpringConfig配置类，代替spring的配置文件
1
2
3
| @Configuration public class SpringConfig {
//ssm整合之后，spring的配置信息写在此类中
}
|
创建WebConfig配置类，代替SpringMVC的配置文件
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
| package com.white.mvc.config;
import com.white.mvc.interceptor.TestInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.context.ContextLoader;
import org.springframework.web.context.WebApplicationContext;
import org.springframework.web.multipart.MultipartResolver;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.*;
import org.springframework.web.servlet.handler.SimpleMappingExceptionResolver;
import org.thymeleaf.spring5.SpringTemplateEngine;
import org.thymeleaf.spring5.view.ThymeleafViewResolver;
import org.thymeleaf.templatemode.TemplateMode;
import org.thymeleaf.templateresolver.ITemplateResolver;
import org.thymeleaf.templateresolver.ServletContextTemplateResolver;
import java.util.List;
import java.util.Properties;
/**
* 代替SpringMVC的配置文件：
* 1、扫描组件 2、视图解析器 3、view-controller 4、default-servlet-handler
* 5、mvc注解驱动 6、文件上传解析器 7、异常处理 8、拦截器
*/
//将当前类标识为一个配置类
@Configuration
//1、扫描组件
@ComponentScan("com.white.mvc.controller")
//5、mvc注解驱动
@EnableWebMvc
public class WebConfig implements WebMvcConfigurer {
//4、default-servlet-handler
@Override
public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
configurer.enable();
}
//8、拦截器
@Override
public void addInterceptors(InterceptorRegistry registry) {
TestInterceptor testInterceptor = new TestInterceptor();
registry.addInterceptor(testInterceptor).addPathPatterns("/**");
}
//3、view-controller
@Override
public void addViewControllers(ViewControllerRegistry registry) {
registry.addViewController("/hello").setViewName("hello");
}
//6、文件上传解析器
@Bean
public MultipartResolver multipartResolver(){
CommonsMultipartResolver commonsMultipartResolver = new CommonsMultipartResolver();
return commonsMultipartResolver;
}
//7、异常处理
@Override
public void configureHandlerExceptionResolvers(List<HandlerExceptionResolver> resolvers) {
SimpleMappingExceptionResolver exceptionResolver = new SimpleMappingExceptionResolver();
Properties prop = new Properties();
prop.setProperty("java.lang.ArithmeticException", "error");
exceptionResolver.setExceptionMappings(prop);
exceptionResolver.setExceptionAttribute("exception");
resolvers.add(exceptionResolver);
}
//配置生成模板解析器
@Bean
public ITemplateResolver templateResolver() {
WebApplicationContext webApplicationContext = ContextLoader.getCurrentWebApplicationContext();
// ServletContextTemplateResolver需要一个ServletContext作为构造参数，可通过WebApplicationContext 的方法获得
ServletContextTemplateResolver templateResolver = new ServletContextTemplateResolver(
webApplicationContext.getServletContext());
templateResolver.setPrefix("/WEB-INF/templates/");
templateResolver.setSuffix(".html");
templateResolver.setCharacterEncoding("UTF-8");
templateResolver.setTemplateMode(TemplateMode.HTML);
return templateResolver;
}
//生成模板引擎并为模板引擎注入模板解析器
@Bean
public SpringTemplateEngine templateEngine(ITemplateResolver templateResolver) {
SpringTemplateEngine templateEngine = new SpringTemplateEngine();
templateEngine.setTemplateResolver(templateResolver);
return templateEngine;
}
//生成视图解析器并未解析器注入模板引擎
@Bean
public ViewResolver viewResolver(SpringTemplateEngine templateEngine) {
ThymeleafViewResolver viewResolver = new ThymeleafViewResolver();
viewResolver.setCharacterEncoding("UTF-8");
viewResolver.setTemplateEngine(templateEngine);
return viewResolver;
}
}
|
测试功能
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
| package com.white.mvc.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class TestController {
@RequestMapping("/")
public String index(){
return "index";
}
}
|