从零开始--Spring项目整合(2)整合SpringMVC

1、pom.xml 定义版本

<properties>
          <spring.version>4.2.7.RELEASE</spring.version>
        <jackson.version>2.6.7</jackson.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

2、pom.xml 添加依赖

<!-- spring mvc 框架 -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>${spring.version}</version>
    </dependency>

    <!-- servlet -->
    <dependency>
            <groupId>javax.servlet</groupId>
        <artifactId>servlet-api</artifactId>
        <version>2.5</version>
    </dependency>

    <!-- jsp/jstl/core 页面标签 -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>
    <dependency>
        <groupId>taglibs</groupId>
        <artifactId>standard</artifactId>
        <version>1.1.2</version>
    </dependency>

    <!-- SLF4J API -->
    <!-- SLF4J 是一个日志抽象层，允许你使用任何一个日志系统，并且可以随时切换还不需要动到已经写好的程序 -->
    <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
           <version>1.7.22</version>
    </dependency>

    <!-- Log4j 日志系统（最常用） -->
    <dependency>
        <groupId>org.slf4j</groupId>
        <artifactId>slf4j-log4j12</artifactId>
        <version>1.7.22</version>
    </dependency>

    <!-- jackson -->
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-core</artifactId>
        <version>${jackson.version}</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-annotations</artifactId>
        <version>${jackson.version}</version>
    </dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>${jackson.version}</version>
    </dependency>

3、修改web.xml文件

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

    <!-- Spring的log4j监听器 -->
    <listener>
        <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
    </listener>

    <!-- 字符集 过滤器  -->
    <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>

    <!-- Spring view分发器 -->
    <servlet>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>/WEB-INF/classes/spring/dispatcher-servlet.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>  

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
      </listener>
      <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath*:spring/*.xml</param-value>
      </context-param>

</web-app>

4、在resources源码包内新建spring文件夹，专门存放spring的配置文件

5、把新建dispatcher-servlet.xml ，内容如下，放入spring文件夹内

<?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:websocket="http://www.springframework.org/schema/websocket"
    xmlns:tx="http://www.springframework.org/schema/tx" 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.xsd
       http://www.springframework.org/schema/tx
       http://www.springframework.org/schema/tx/spring-tx.xsd
          http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc.xsd
       http://www.springframework.org/schema/websocket http://www.springframework.org/schema/websocket/spring-websocket.xsd">

    <!-- 配置扫描的包 -->
    <context:component-scan base-package="com.*" />

    <!-- 注册HandlerMapper、HandlerAdapter两个映射类 -->
    <mvc:annotation-driven />

    <!-- 访问静态资源 -->
    <mvc:default-servlet-handler />

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

</beans>

6、新建 log4j.properties 日志配置文件，放入resources源码包内

# Priorities are: DEBUG, INFO, WARN, ERROR, or FATAL.
log4j.rootCategory=INFO, CONSOLE, FILE
logs.dir=${catalina.base}/logs/springdemo/
logs.filename=logs
fileBufferSize=20480
#log to File
log4j.appender.FILE=org.apache.log4j.DailyRollingFileAppender
log4j.appender.FILE.File=${webapp.root}/logs/test.log
log4j.appender.FILE.encoding=UTF-8
log4j.appender.FILE.Append=true
log4j.appender.FILE.LocationInfo=true
log4j.appender.FILE.DatePattern='.'yyyy-MM-dd'.log'
log4j.appender.FILE.layout=org.apache.log4j.PatternLayout
log4j.appender.FILE.layout.ConversionPattern=[%-5p] %d(%r) --> %l: %m %x %n
log4j.appender.FILE.bufferSize=${fileBufferSize}
# CONSOLE is set to be a ConsoleAppender using a PatternLayout.
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.Threshold=DEBUG
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=- %m%n

7、新建一个LoggerController，测试SpringMVC的访问

package com.jiafuwei.spring.controller;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class LoggerController{
    final Logger logger = LoggerFactory.getLogger(getClass());

    @RequestMapping("/logger")
    public void handleRequest(HttpServletRequest req, HttpServletResponse resp) throws Exception {

         resp.getWriter().println("test logger");

         logger.info("这是一条日志信息 - {}", "jiafuwei");
    }
}

8、启动项目，并进行访问 http://localhost:8080/spring-mvc-web/logger

页面得到结果：

控制台打印：

根据配置文件的设置，日志存放地址为项目发布路径下，logs的文件夹内

至此，SpringMVC搭建成功

我们再测试SpringMVC对 restful api 的支持

新建User.java对象

package com.jiafuwei.spring.controller;

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

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

import com.jiafuwei.spring.po.User;

@Controller
@RequestMapping("/user")
public class RESTfulJSONController {

    //访问路径 http://localhost:8080/spring-mvc-web/user/view/jiafuwei
    /**Spring MVC RESTful JSON**/
    @RequestMapping(value = "/view/{username}", method = RequestMethod.GET)
    @ResponseBody
    public User view(@PathVariable String username){
        User user = new User();
        user.setAge(10);
        user.setEmail("jiafuwei@qq.com");
        user.setPassword("123");
        user.setUsername(username);
        System.out.println("view username:"+username);

        return user;
    }

    //访问路径  http://localhost:8080/spring-mvc-web//user/query?username=jiahaha
    @RequestMapping(value = "/query", method = RequestMethod.GET)
    @ResponseBody
    public User query(@RequestParam(value="username", required=true) String username){
        User user = new User();
        user.setAge(10);
        user.setEmail("jiafuwei@qq.com");
        user.setPassword("123");
        user.setUsername(username);
        System.out.println("view username:"+username);

        return user;
    }

    //访问路径  http://localhost:8080/spring-mvc-web/user/list
    @RequestMapping(value = "/list", method = RequestMethod.GET)
    public @ResponseBody
    List<User> listPerson(@RequestParam(value = "username", required = false, defaultValue = "") String name) {

        User user = new User();
        user.setAge(10);
        user.setEmail("jiafuwei@qq.com");
        user.setPassword("123");
        user.setUsername("haha");

        User user2 = new User();
        user2.setAge(50);
        user2.setEmail("tyew@qq.com");
        user2.setPassword("frekkk");
        user2.setUsername("zheshi");

        List<User> listUser = new ArrayList<User>();
        listUser.add(user);
        listUser.add(user2);

        return listUser;
    }

}

通过访问，直接把User对象转换为json格式

项目地址 https://github.com/jiafuweiJava/spring-integration