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SprintBoot学习（三）

Thymeleaf模板引擎

1、thymeleaf是一个Java类库,，他是xml/xhtml/html5的模板引擎可以作为view层

2、themeleaf基本语法

引入thymeleaf
```

<html xmlns:th="http://www.thymeleaf.org">
```
将镜头页面转换成动态的视图，要进行动态处理的元素将使用“th:”为前缀

访问model中的数据

<div class="panel-body">
        <!--通过${}访问model中的属性-->
        <span th:text="${singlePerson.name}"></span>
    </div>

需要处理的动态内容需要加上“th:”前缀

model中的数据迭代

<div class="panel-body">
    <ul class="list-group">
        <!--通过th:each 来迭代数据-->
        <li class="list-grop-item" th:each="person:${people}">
            <span th:text="${person.name}"></span>
            <span th:text="${person.age}"></span>
        </li>
    </ul>
</div>

person做为迭代元素来使用，然后像上面一样访问迭代元素中的属性

数据判断

<!--通过${not #lists.isEmpty(people)} 来判断数据。Thymeleaf 支持> 、<、>=、<=、  == 、!= 作为比较条件,同时也支持将Spring EL表达式语言用于条件中-->
<div th:if="${not #lists.isEmpty(people)}">

Thymeleaf 支持> 、<、>=、<=、 == 、!= 作为比较条件,同时也支持将Spring EL表达式语言用于条件中

3、测试案例：

新建spring-boot项目

新建一个JavaBean

package com.example.spring_boot_thymeleaf_test.entity;

/**
 * @Author: Amy
 * @Date: 2018/10/16
 * @Time: 17:23
 * Description:
 */
public class Person {

    private  String name ;

    private  Integer age;

    public Person(){

        super();
    }
    
    public Person(String name , Integer age ){

        super();
        this.age=age;
        this.name=name;

    }

    public String getName() {
        return name;
    }

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

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }
}

启动类（controller和启动类在同一个类中）

package com.example.spring_boot_thymeleaf_test;

import com.example.spring_boot_thymeleaf_test.entity.Person;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import java.util.ArrayList;
import java.util.List;
@Controller
@SpringBootApplication
public class SpringBootThymeleafTestApplication {

    public static void main(String[] args) {

        SpringApplication.run(SpringBootThymeleafTestApplication.class, args);
    }

    @RequestMapping("/")
    public String index(Model model){
        Person single = new Person("Amy",21);
        List<Person> people = new ArrayList<Person>();
        Person p1 = new Person("旋涡鸣人",12);
        Person p2 = new Person("佐助",12);
        people.add(p1);
        people.add(p2);
        model.addAttribute("singlePerson",single);
        model.addAttribute("people",people);
        return  "index";
    }


}

当启动类和controller在同一个类的时候，要使用@controller注解

controller类（controller和启动类不在同一个类中）

package com.example.spring_boot_thymeleaf_test;

import com.example.spring_boot_thymeleaf_test.entity.Person;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import java.util.ArrayList;
import java.util.List;

/**
 * @Author: Amy
 * @Date: 2018/10/17
 * @Time: 17:12
 * Description:
 */
@Controller
@RequestMapping("/test")
public class TestController {
   /* @RequestMapping("/index")
    public String index(Model model){
        Person single = new Person("Amy",21);
        List<Person> people = new ArrayList<Person>();
        Person p1 = new Person("旋涡鸣人",12);
        Person p2 = new Person("佐助",12);
        people.add(p1);
        people.add(p2);
        model.addAttribute("singlePerson",single);
        model.addAttribute("people",people);
        return  "index";
    }*/
    @RequestMapping("/index")
    public ModelAndView index(){
        ModelAndView model = new ModelAndView("/index");
        Person single = new Person("Amy",21);
        List<Person> people = new ArrayList<Person>();
        Person p1 = new Person("旋涡鸣人",12);
        Person p2 = new Person("佐助",12);
        people.add(p1);
        people.add(p2);
        model.addObject("singlePerson",single);
        model.addObject("people",people);
        return model;
    }
}

当启动类和controller不在同一个类的时候，启动类要放在根目录下，启动类上使用了注解@SpringBootApplication会默认扫描启动类的所在的包和子包下面所有的注解；如果controller和启动类不在同一个包需要使用注解@ComponentScan来指定扫描的包

index页面

<!DOCTYPE html>
<!--将镜头页面转换成动态的视图，要进行动态处理的元素将使用“th:”为前缀-->
<!--引入Thymeleaf-->
<html xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <!--引入Bootstrap-->
    <link rel="stylesheet" href="//cdn.bootcss.com/bootstrap/3.3.5/css/bootstrap.min.css">
    <link rel="stylesheet" href="//cdn.bootcss.com/bootstrap/3.3.5/css/bootstrap-theme.min.css">
</head>
<!--通过@{}引用web静态资源，引入jQuery-->
<script th:src="@{jquery-3.3.1.min.js}" type="text/javascript"></script>
<body>
<div class="panel panel-primary">
    <div class="panel-heading">
        <h3 class="panel-title">访问model</h3>
    </div>
    <div class="panel-body">
        <!--通过${}访问model中的属性-->
        <span th:text="${singlePerson.name}"></span>
    </div>
</div>
<!--通过${not #lists.isEmpty(people)} 来判断数据。Thymeleaf 支持> 、<、>=、<=、  == 、!= 作为比较条件,同时也支持将Spring EL表达式语言用于条件中-->
<div th:if="${not #lists.isEmpty(people)}">
    <div class="panel panel-primary">
        <div class="panel-heading">
            <h3 class="panel-title">列表</h3>
        </div>
        <div class="panel-body">
            <ul class="list-group">
                <!--通过th:each 来迭代数据-->
                <li class="list-grop-item" th:each="person:${people}">
                    <span th:text="${person.name}"></span>
                    <span th:text="${person.age}"></span>
                </li>
            </ul>
        </div>
    </div>
</div>
</body>
</html>

运行结果，浏览器访问http://localhost:8080/test/index 或者http://localhost:8080/ 页面如下

Servlet、Filter、Listener的注册

1、直接注册Bean

Servlet注册测试

package com.example.spring_boot_thymeleaf_test.servlet;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * @Author: Amy
 * @Date: 2018/12/5
 * @Time: 17:10
 * Description:
 */public class HelloServlet extends HttpServlet {

    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println("GET");
        request.setCharacterEncoding("UTF-8");
        response.setCharacterEncoding("UTF-8");
        // 向客户端生成响应数据
        response.setContentType("text/html;charset=UTF-8");
        PrintWriter w = response.getWriter();
        w.println("<h1 style='text-align:center;color:blue;'>Hello, Servlet!</h1>");
    }
}

配置类

@Configuration
public class WebCofig {
    @Bean
    public HelloServlet helloServlet(){
        return  new HelloServlet();
    }

}

Filter注册测试

package com.example.spring_boot_thymeleaf_test.filter;

import javax.servlet.*;
import java.io.IOException;

/**
 * @Author:Amy
 * @Date: 2018/12/5
 * @Time: 17:32
 * Description:
 */public class HelloFilter implements Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        System.out.println( "Filter Init" );

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        System.out.println( "Hello" );
        filterChain.doFilter( servletRequest, servletResponse );
        System.out.println( "Filter" );
    }

    @Override
    public void destroy() {
        System.out.println("Filter Destroy");

    }
}

配置类

 @Bean
    public HelloFilter helloFilter(){
        return new HelloFilter();
    }

Listener注册测试

package com.example.spring_boot_thymeleaf_test.listener;

import javax.servlet.DispatcherType;
import javax.servlet.ServletRequest;
import javax.servlet.ServletRequestEvent;
import javax.servlet.ServletRequestListener;
import javax.servlet.http.HttpServletRequest;

/**
 * @Author: Amy
 * @Date: 2018/12/5
 * @Time: 17:38
 * Description:
 */
public class RequestLifecycleListener implements ServletRequestListener {

    @Override
    public void requestDestroyed(ServletRequestEvent event) {
        ServletRequest req = event.getServletRequest();
        HttpServletRequest request = (HttpServletRequest) req ;
        String uri = request.getRequestURI();
        DispatcherType type = request.getDispatcherType();
        String name = req.getLocalName();
        System.out.println(  "来自"+name+"请求类型为"+type + " ,请求路径是 " + uri +"的请求结束");
    }

    @Override
    public void requestInitialized(ServletRequestEvent event) {
        ServletRequest req = event.getServletRequest();
        HttpServletRequest request = (HttpServletRequest) req ;
        String uri = request.getRequestURI();
        DispatcherType type = request.getDispatcherType();
        String name = req.getLocalName();
        System.out.println( "接收到请求：来自" +name+"的请求，请求类型为"+type + " ,请求路径是 " + uri );

    }

}

配置类

@Bean
    public RequestLifecycleListener requestLifecycleListener(){
        return  new RequestLifecycleListener();
    }

2、通过RegistrationBean

Servlet注册配置文件

@Bean
    public ServletRegistrationBean servletRegistrationBean(){
        return  new ServletRegistrationBean(new HelloServlet(),"/hello/*");
    }

Filter注册配置文件

  @Bean
    public FilterRegistrationBean filterRegistrationBean(){
        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
        filterRegistrationBean.addUrlPatterns("/hello");
        filterRegistrationBean.setFilter(new HelloFilter());
        return  filterRegistrationBean;
    }

Listener注册配置文件

  @Bean
    public ServletListenerRegistrationBean servletListenerRegistrationBean(){
        return new ServletListenerRegistrationBean(new RequestLifecycleListener());
    }

3、使用注解

Servlet注册
```
@WebServlet("/hello/*")
```
启动类增加@ServletComponentScan注解，会扫描到相关组件
Filter注册
```
@WebFilter("/hello")
```
Listener注册
```
@WebListener
```

配置Tomcat

1、使用配置文件进行配置

####配置servlet容器
#修改端口号
server.port=8080
#修改访问路径,默认是/
server.servlet.context-path=/springboot
####配置Tomcat
#配置Tomcat的编码
server.tomcat.uri-encoding=utf-8

2、使用配置类进行配置

package com.example.spring_boot_thymeleaf_test;

import org.apache.catalina.connector.Connector;
import org.apache.coyote.http11.Http11NioProtocol;
import org.springframework.boot.web.embedded.tomcat.TomcatConnectorCustomizer;
import org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory;
import org.springframework.boot.web.server.WebServerFactory;
import org.springframework.boot.web.server.WebServerFactoryCustomizer;
/**
 * @Author: Amy
 * @Date: 2018/12/5
 * @Time: 19:01
 * Description:
 */
public class ServletContainerConfig implements WebServerFactoryCustomizer {
    @Override
    public void customize(WebServerFactory factory) {
        ((TomcatServletWebServerFactory)factory).addConnectorCustomizers(new TomcatConnectorCustomizer() {
            @Override
            public void customize(Connector connector) {
                Http11NioProtocol protocol = (Http11NioProtocol) connector.getProtocolHandler();
                protocol.setPort(8081);
            }
        });

    }

}

Spring Boot2.0以上使用WebServerFactoryCustomizer接口替换EmbeddedServletContainerCustomizer组件完成对嵌入式Servlet容器的配置。

替换Tomcat

1、替换为jetty

     <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jetty</artifactId>
            <version>2.0.6.RELEASE</version>
        </dependency>

2、替换为Undertow

       <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-undertow</artifactId>
            <version>2.0.6.RELEASE</version>
        </dependency>

https://blog.csdn.net/caychen/article/details/80351936

https://blog.csdn.net/Hard__ball/article/details/81281898

转载请于明显处标明出处

https://www.cnblogs.com/AmyZheng/p/9799262.html

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原文地址：https://www.cnblogs.com/AmyZheng/p/9799262.html