[java]快速创建servlet和springmvc测试项目

web三层架构

web层
    com.demo.
        web
        servlet
        controller
service层
    com.demo.
        service
            serviceimpl
dao层
    com.demo.
        dao
            daoimpl
        repository
        mapper
实体bean对象
    com.demo.
        pojo
        entry
        domain
        bean
        model
测试包
    com.demo.
        test
        junit
工具类
    com.demo.
        utils

参考
新建一个Maven工程当做父工程！(删除无关的)可以不用使用任何模板. 子项目可以继承父的依赖.

创建springmvc项目

new project, maven webapp模板

pom.xml

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.2.5.RELEASE</version>
    </dependency>

如果需要事务支持

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>5.2.5.RELEASE</version>
        </dependency>

如果还需要servlet开发, 导入相关包即可.

添加依赖后idea刷新maven

创建对应的包(目录)

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
    <display-name>Archetype Created Web Application</display-name>
    <!-- 字符编码处理 -->
    <filter>
        <filter-name>characterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
       
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    
    <!--    支持form形式restful-->
    <filter>
        <filter-name>HiddenHttpMethodFilter</filter-name>
        <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>HiddenHttpMethodFilter</filter-name>
        <servlet-name>DispatcherServlet</servlet-name>
    </filter-mapping>

    
    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>

springmvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xmlns="http://www.springframework.org/schema/beans"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">
    <!-- scan the package and the sub package -->
    <context:component-scan base-package="com.demo"></context:component-scan>

    <!-- configure the InternalResourceViewResolver -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>

    <!-- don't handle the static resource -->
    <mvc:default-servlet-handler/>
    <!-- if you use annotation you must configure following setting -->
    <mvc:annotation-driven/>
</beans>

【Spring框架】mvc:default-servlet-handler/的作用

<mvc:default-servlet-handler />

<mvc:resources location="/,classpath:/META-INF/publicResources/" mapping="/resources/**"/>

Content type 'application/json;charset=UTF-8' not supported解决:添加 mvc:annotation-driven/

415 (Unsupported Media Type) 原因及解决方案: 前端缺了content-type为json

springmvc controller层接收List类型的参数

接收List、List、List<Map<String,Object>>、User[]、User(bean里面包含List)几种较为复杂的集合参数示例

controller

HelloWorld.java

@Controller
public class HelloWorld {
    @RequestMapping("/test01")
    @ResponseBody
    public String index() {
        return "test";
    }
}

HelloWorld.java

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class HelloWorld {
    @GetMapping("/test01")
    public String testget() {
        return "do get";
    }

    @PostMapping("/test01")
    public String testpost() {
        return "do post";
    }
}

添加tomcat服务器

启动tomcat服务测试

创建servlet测试模块

父模块选择刚创建的

<dependencies>
   <dependency>
       <groupId>junit</groupId>
       <artifactId>junit</artifactId>
       <version>4.12</version>
   </dependency>
   <-- 导入springmvc依赖 !->
   <dependency>
       <groupId>org.springframework</groupId>
       <artifactId>spring-webmvc</artifactId>
       <version>5.1.9.RELEASE</version>
   </dependency>
   <-- 导入servlet 和 jsp 的 jar 依赖 !->
   <dependency>
       <groupId>javax.servlet</groupId>
       <artifactId>servlet-api</artifactId>
       <version>2.5</version>
   </dependency>
   <dependency>
       <groupId>javax.servlet.jsp</groupId>
       <artifactId>jsp-api</artifactId>
       <version>2.2</version>
   </dependency>
   <dependency>
       <groupId>javax.servlet</groupId>
       <artifactId>jstl</artifactId>
       <version>1.2</version>
   </dependency>
</dependencies>

web.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
        xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
        xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
        version="4.0">
   <servlet>
       <servlet-name>HelloServlet</servlet-name>
       <servlet-class>com.demo.servlet.HelloServlet</servlet-class>
   </servlet>
   <servlet-mapping>
       <servlet-name>HelloServlet</servlet-name>
       <url-pattern>/user</url-pattern>
   </servlet-mapping>
</web-app>