SpringMVC基础框架搭建

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　　近些年来目前很多公司已经SpringMVC作为Struts的替代方案了，其优劣势在此不做详细讲解了。而互联网分布式系统的盛行使得单机web已经不再流行，更多的方向是动静分离。动静分离是将网站静态资源（HTML，JavaScript，CSS，img等文件）与后台应用（Java或其他后台语言）分开部署。前后端使用异步方式（比如：ajax之类）进行数据交互。本文主要讲解使用SpringMVC对外提供接口URL并返回json数据。

具体步骤如下：

1、web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xmlns="http://java.sun.com/xml/ns/javaee" 
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" 
version="3.0">

  <!--configure the setting of springmvcDispatcherServlet and configure the mapping-->
  <servlet>
      <servlet-name>springmvc</servlet-name>
      <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
      <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc-servlet.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
  </servlet>

  <servlet-mapping>
      <servlet-name>springmvc</servlet-name>
      <url-pattern>/</url-pattern>
  </servlet-mapping>
  
</web-app>

2、spring-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/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"
    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-4.1.xsd
        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd">                    

    <!-- 配置需要扫描的包 -->
    <context:component-scan base-package="com.mao2080.*"/>
    
    <!-- 配置启用注解 -->
    <mvc:annotation-driven />
    
</beans>

3、pom.xml

<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>mao.mao2080</groupId>
  <artifactId>springmvc</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  <dependencies>
      <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>4.3.0.Release</version>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>4.0.0</version>
        <scope>provided</scope>
    </dependency>
  </dependencies>
</project>

4、controller

package com.mao2080.controller;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.mao2080.beans.ResObject;
import com.mao2080.beans.User;

@Controller
@RequestMapping("/testController")
public class TestController {
    
    /**
     * 
     * 描述：登录
     * @author Administrator
     * @created 2017年12月2日 下午12:47:41
     * @since 
     * @param request
     * @param o
     * @return
     */
    @RequestMapping("/login")
    @ResponseBody
    public ResObject homeProduct(HttpServletRequest request, @ModelAttribute User o) {
        if("admin".equals(o.getUserName()) && "admin".equals(o.getUserName())){
            return new ResObject();
        }
        return new ResObject(403, "账号或密码错误...", null);
    }

}

5、ResObject

package com.mao2080.beans;

/**
 * 
 * 描述：返回POJO
 * @author Administrator
 * @created 2017年12月2日 下午12:46:20
 * @since
 */
public class ResObject {
    
    /**状态码*/
    private int code = 200;
    
    /**描述信息（如果是异常则返回异常信息）*/
    private String desc = "Success";
    
    /**成功后数据*/
    private Object data;
    
    public ResObject() {
        super();
    }

    public ResObject(Object data) {
        super();
        this.data = data;
    }

    public ResObject(int code, String desc, Object data) {
        super();
        this.code = code;
        this.desc = desc;
        this.data = data;
    }

    public int getCode() {
        return code;
    }

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

    public String getDesc() {
        return desc;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }

    public Object getData() {
        return data;
    }

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

}

6、User

package com.mao2080.beans;

/**
 * 
 * 描述：用户pojo
 * @author Administrator
 * @created 2017年12月2日 下午12:44:43
 * @since
 */
public class User {
    
    private String userName;
    
    private String password;
    
    public User() {
        super();
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

}

7、访问结果

8、目录结构

9、资源下载

https://files.cnblogs.com/files/mao2080/springmvc.zip