创建Maven分布式前台系统架构，写出京动态导航，跨域返Json数据

前台系统架构

分层的架构有什么好处：

1. 有利于系统的维护，扩展。
2. 分层的结构是按照功能细化，细化之后就能够分布式的部署。
3. 灵活性
4. 前台系统与服务层可以分离
5. 开发团队可以分开，提高开发效率

缺点：

1. 服务器之间需要使用接口进行通信，开发的工作量提高

前台系统可以分为两部分：

1. 服务层的web工程 功能就是发布服务
2. 表现层：负责展现页面，没有业务逻辑，所有的业务就是调用服务层的服务
   搭建服务protal-rest系统
   服务的形式：使用http协议传递json数据，主要的功能是供其它系统进行调用

服务层所使用技术

1. Mybatis
2. Spring
3. SpringMVC

搭建protal-rest的过程与protal-manager-web整合的过程一样

搭建前台（门户）系统：它可以将各种应用，数据的资源以及互联网的资源集成到一个信息管理平台上。并以统一的用户界面提供给我们的用户。
所使用的技术：

1. Spring+SpringMVC
2. JS CSS JQuery Bootstrap AngularJS NodeJS React H5
3. HttpClient

实现商品分类的展示流程

Protal-rest进行发布服务
需求
请求的URL:是当鼠标滑动到链接的时候，就会发出一个事件，做一个Ajax的请求（json数据），这些数据会包含分类的信息，得到数据之后需要初始化分类的菜单并展现出业

#####注意：
所有的分类的数据要从protal-rest中的获取
如果我们要从protal-front里面获取json数据是没有问题，但是我们现在要从protal-rest中获取json数据。所以我们就可以使用ajax请求去调用服务器的数据。

这样就会出现跨域访问的问题
Failed to load http://localhost:8081/category.json: No ‘Access-Control-Allow-Origin’ header is present on the requested resource. Origin ‘http://localhost:8082’ is therefore not allowed access.

跨域问题

1. 什么是跨域？
   a) 域名不同
   b) 域名相同但是端口不同
2. 跨域问题是浏览器的安全的限制，不允许js进行跨域的访问。

如何解决跨域的问题：使用jsonp来解决跨域的问题

1. Jsonp的原理：
   浏览器在js请求的时候，是可以通过

图二

##创建foreknow-rest 也是继承parent

配置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>
  <parent>
		<groupId>com.foreknow</groupId>
		<artifactId>foreknow-parent</artifactId>
		<version>0.0.1-SNAPSHOT</version>
	</parent>
  <groupId>com.foreknow</groupId>
  <artifactId>foreknow-rest</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  <dependencies>
  		<dependency>
			<groupId>com.foreknow</groupId>
			<artifactId>foreknow-manager-mapper</artifactId>
			<version>0.0.1-SNAPSHOT</version>
		</dependency>
	<!-- 	String -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-beans</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-jdbc</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-aspects</artifactId>
		</dependency>
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>servlet-api</artifactId>
			<scope>provided</scope>
		</dependency>
			<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>jsp-api</artifactId>
			<scope>provided</scope>
		</dependency>
	<!-- 	文件上传组件 -->
<dependency>
			<groupId>commons-fileupload</groupId>
			<artifactId>commons-fileupload</artifactId>
		</dependency>
	
  </dependencies>
  <build>
		<plugins>
			<plugin>
				<groupId>org.apache.tomcat.maven</groupId>
				<artifactId>tomcat7-maven-plugin</artifactId>
				<version>2.2</version>
				<configuration>
					<port>8081</port>
					<path>/</path>
					<uriEncoding>UTF-8</uriEncoding>
				</configuration>
			</plugin>
		</plugins>
	</build>
</project>

设置run configurations 服务器

位置 web.xml 中央控制器

<?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_2_5.xsd" version="2.5">
  <display-name>foreknow-rest</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
   <!-- 加载spring容器 -->
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:spring/applicationContext-*.xml</param-value>
	</context-param>
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>
	<!-- 解决post乱码 -->
	<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>
	</filter>
	<filter-mapping>
		<filter-name>CharacterEncodingFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
	<!-- springmvc的前端控制器 -->
	<servlet>
		<servlet-name>foreknow-rest</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<!-- contextConfigLocation不是必须的， 如果不配置contextConfigLocation， springmvc的配置文件默认在：WEB-INF/servlet的name+"-servlet.xml" -->
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>classpath:spring/springmvc.xml</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>foreknow-rest</servlet-name>
		<url-pattern>/rest/*</url-pattern>
	</servlet-mapping>
</web-app>

在src/main/resources

SqlMapConfig.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
		PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
		"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
	<!-- 配置分页插件    拦截器-->
	<plugins>
		<plugin interceptor="com.github.pagehelper.PageHelper">
			<!-- 设置数据库类型 Oracle,Mysql,MariaDB,SQLite,Hsqldb,PostgreSQL六种数据库-->        
        	<property name="dialect" value="mysql"/>
		</plugin>
	</plugins>
</configuration>

db.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/taobao?characterEncoding=utf-8
jdbc.username=root
jdbc.password=root

resource.properties

#FTP\u76F8\u5173\u914D\u7F6E
#FTP\u7684ip\u5730\u5740
FTP_ADDRESS=192.168.230.128
FTP_PORT=21
FTP_USERNAME=ftpuser
FTP_PASSWORD=sunyong0305
FTP_BASE_PATH=/home/ftpuser/www/images

#\u56FE\u7247\u670D\u52A1\u5668\u7684\u76F8\u5173\u914D\u5236
#\u56FE\u7247\u670D\u52A1\u5668\u7684\u57FA\u7840\u8DEF\u5F84
#FILI_UPLOAD_PATH=D:/temp/imagestest/webapps/images
IMAGE_BASE_URL=http://192.168.230.128

applicationContext-dao.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
	http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
	http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
	http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd">

	<!-- 数据库连接池 -->
	<!-- 加载配置文件 -->
	<context:property-placeholder location="classpath:resource/*.properties" />
	<!-- 数据库连接池 -->
	<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
		destroy-method="close">
		<property name="url" value="${jdbc.url}" />
		<property name="username" value="${jdbc.username}" />
		<property name="password" value="${jdbc.password}" />
		<property name="driverClassName" value="${jdbc.driver}" />
		<property name="maxActive" value="10" />
		<property name="minIdle" value="5" />
	</bean>
	<!-- 配置sqlsessionFactory -->
	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<property name="configLocation" value="classpath:mybatis/SqlMapConfig.xml"></property>
		<property name="dataSource" ref="dataSource"></property>
	</bean>
	<!-- 配置扫描包，加载mapper代理对象 -->
	<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
		<property name="basePackage" value="com.foreknow.mapper"></property>
	</bean>
</beans>

applicationContext-service.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
	http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
	http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
	http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd">

	<!-- 扫描包加载Service实现类 -->
	<context:component-scan base-package="com.foreknow.rest.serive"></context:component-scan>
</beans>

applicationContext-trans.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
	http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
	http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
	http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd">

	<!-- 事务管理器 -->
	<bean id="transactionManager"
		class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<!-- 数据源 -->
		<property name="dataSource" ref="dataSource" />
	</bean>
	<!-- 通知 -->
	<tx:advice id="txAdvice" transaction-manager="transactionManager">
		<tx:attributes>
			<!-- 传播行为 -->
			<tx:method name="save*" propagation="REQUIRED" />
			<tx:method name="insert*" propagation="REQUIRED" />
			<tx:method name="add*" propagation="REQUIRED" />
			<tx:method name="create*" propagation="REQUIRED" />
			<tx:method name="delete*" propagation="REQUIRED" />
			<tx:method name="update*" propagation="REQUIRED" />
			<tx:method name="find*" propagation="SUPPORTS" read-only="true" />
			<tx:method name="select*" propagation="SUPPORTS" read-only="true" />
			<tx:method name="get*" propagation="SUPPORTS" read-only="true" />
		</tx:attributes>
	</tx:advice>
	<!-- 切面 -->
	<aop:config>
		<aop:advisor advice-ref="txAdvice"
			pointcut="execution(* com.foreknow.rest.serive.*.*(..))" />
	</aop:config>
</beans>

springmvc.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:p="http://www.springframework.org/schema/p"
	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/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

	<context:component-scan base-package="com.foreknow.rest.controller" />
	<mvc:annotation-driven />
	<!-- 定义文件上传解析器 -->
	<bean id="multipartResolver"
		class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		<!-- 设定默认编码 -->
		<property name="defaultEncoding" value="UTF-8"></property>
		<!-- 设定文件上传的最大值5MB，5*1024*1024 -->
		<property name="maxUploadSize" value="5242880"></property>
	</bean>
<!-- 视图解析器 -->
	<bean
		class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/WEB-INF/jsp/" />
		<property name="suffix" value=".jsp" />
	</bean>

	<mvc:resources location="/WEB-INF/css/" mapping="/css/**" />
	<mvc:resources location="/WEB-INF/js/" mapping="/js/**" />
</beans>

###接下来 创建一个maven工程 foreknow-protal 继承parent

配置 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>
  <parent>
		<groupId>com.foreknow</groupId>
		<artifactId>foreknow-parent</artifactId>
		<version>0.0.1-SNAPSHOT</version>
	</parent>
  <groupId>com.foreknow</groupId>
  <artifactId>foreknow-protal</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  <dependencies>
  		<dependency>
			<groupId>com.foreknow</groupId>
			<artifactId>foreknow-common</artifactId>
			<version>0.0.1-SNAPSHOT</version>
		</dependency>
			<!-- 	String -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-beans</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-webmvc</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-jdbc</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-aspects</artifactId>
		</dependency>
	<!-- 	JSP -->
	<dependency>
			<groupId>jstl</groupId>
			<artifactId>jstl</artifactId>
		</dependency>
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>servlet-api</artifactId>
			<scope>provided</scope>
		</dependency>
			<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>jsp-api</artifactId>
			<scope>provided</scope>
		</dependency>
		
  </dependencies>
  <build>
		<plugins>
			<plugin>
				<groupId>org.apache.tomcat.maven</groupId>
				<artifactId>tomcat7-maven-plugin</artifactId>
				<version>2.2</version>
				<configuration>
					<port>8082</port>
					<path>/</path>
					<uriEncoding>UTF-8</uriEncoding>
				</configuration>
			</plugin>
		</plugins>
	</build>
</project>

然后升级更新工程

配置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_2_5.xsd" version="2.5">
  <display-name>foreknow-protal</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
  <!-- 加载spring容器 -->
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:spring/applicationContext-*.xml</param-value>
	</context-param>
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>
	<!-- 解决post乱码 -->
	<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>
	</filter>
	<filter-mapping>
		<filter-name>CharacterEncodingFilter</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
	<!-- springmvc的前端控制器 -->
	<servlet>
		<servlet-name>foreknow-protal</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<!-- contextConfigLocation不是必须的， 如果不配置contextConfigLocation， springmvc的配置文件默认在：WEB-INF/servlet的name+"-servlet.xml" -->
		<init-param>
			<param-name>contextConfigLocation</param-name>
			<param-value>classpath:spring/springmvc.xml</param-value>
		</init-param>
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>foreknow-protal</servlet-name>
		<url-pattern>*.html</url-pattern>
	</servlet-mapping>
</web-app>

然后在 src/main/resources 配置

resource.properties

#FTP\u76F8\u5173\u914D\u7F6E
#FTP\u7684ip\u5730\u5740
FTP_ADDRESS=192.168.230.128
FTP_PORT=21
FTP_USERNAME=ftpuser
FTP_PASSWORD=sunyong0305
FTP_BASE_PATH=/home/ftpuser/www/images

#\u56FE\u7247\u670D\u52A1\u5668\u7684\u76F8\u5173\u914D\u5236
#\u56FE\u7247\u670D\u52A1\u5668\u7684\u57FA\u7840\u8DEF\u5F84
#FILI_UPLOAD_PATH=D:/temp/imagestest/webapps/images
IMAGE_BASE_URL=http://192.168.230.128

applicationContext-service.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
	http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd
	http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
	http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd">

	<!-- 扫描包加载Service实现类 -->
	<context:component-scan base-package="com.foreknow.protal.service"></context:component-scan>
</beans>

springmvc.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:p="http://www.springframework.org/schema/p"
	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/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

	<context:component-scan base-package="com.foreknow.protal.controller" />
	<mvc:annotation-driven />
	<!-- 定义文件上传解析器 -->
<!-- 	<bean id="multipartResolver"
		class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		设定默认编码
		<property name="defaultEncoding" value="UTF-8"></property>
		设定文件上传的最大值5MB，5*1024*1024
		<property name="maxUploadSize" value="5242880"></property>
	</bean> -->
<!-- 视图解析器 -->
	<bean
		class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/WEB-INF/jsp/" />
		<property name="suffix" value=".jsp" />
	</bean>
<!-- 配置静态资源的映射 -->
<!-- 	<mvc:resources location="/WEB-INF/css/" mapping="/css/**" />
	<mvc:resources location="/WEB-INF/js/" mapping="/js/**" /> -->
	
</beans>

####配置好之后 我们写一下，功能的具体实现

在rest 前台的服务层中 我们在webapp 同级 创建一个category.json

用Json Viewer 工具 显示 分析

其中有一个数据源 data

分为 u n i 对应的i下面还有分组 u n i
也就是说 有一级标题 还有二级标题

那么 我们再src/main/java com.foreknow.rest.pojo 包下 创建CatNode.java 和CatResult.java

分别对应 根 data 和 子分类
CatNode.java

package com.foreknow.rest.pojo;

import java.util.List;

import com.fasterxml.jackson.annotation.JsonProperty;

public class CatNode {
	@JsonProperty("n")
	private String name;
	@JsonProperty("u")
	private String url;
	@JsonProperty("i")
	private List<?> item;
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getUrl() {
		return url;
	}
	public void setUrl(String url) {
		this.url = url;
	}
	public List<?> getItem() {
		return item;
	}
	public void setItem(List<?> item) {
		this.item = item;
	}
}

CatResult.java

package com.foreknow.rest.pojo;

import java.util.List;

public class CatResult {
	private List<?> data;

	public List<?> getData() {
		return data;
	}

	public void setData(List<?> data) {
		this.data = data;
	}
}

然后 写出 com.foreknow.rest.service ItemCatService.java 接口

package com.foreknow.rest.service;

import java.util.List;

import com.foreknow.rest.pojo.CatResult;

public interface ItemCatService {
	/**
	 * 前台分类（根节点Data）
	 * @return
	 */
	public CatResult getItemCatList();
	
	/**
	 * 查询分类的列表
	 */
	public List<?> getCatList(long parentId);
	
}

然后写 接口的实现类 com.foreknow.rest.service.impl包下 ItemCatServiceImpl.java

package com.foreknow.rest.service.impl;

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

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.foreknow.mapper.TbItemCatMapper;
import com.foreknow.pojo.TbItemCat;
import com.foreknow.pojo.TbItemCatExample;
import com.foreknow.pojo.TbItemCatExample.Criteria;
import com.foreknow.rest.pojo.CatNode;
import com.foreknow.rest.pojo.CatResult;
import com.foreknow.rest.service.ItemCatService;
@Service
public class ItemCatServiceImpl implements ItemCatService {
	@Autowired
	private TbItemCatMapper tbItemCatMapper;
	@Override
	public CatResult getItemCatList() {
		CatResult catResult = new CatResult();
		//查询分类的列表
		catResult.setData(getCatList(0));
		return catResult;
	}
	
	@Override
	public List<?> getCatList(long parentId) {
//		把结果创建一个resultList  集合
		List resultList = new ArrayList<>();
		TbItemCatExample example = new TbItemCatExample();
		Criteria criteria = example.createCriteria();
//		这个什么意思？
		criteria.andParentIdEqualTo(parentId);
		List<TbItemCat> list = tbItemCatMapper.selectByExample(example);
		for (TbItemCat tbItemCat : list) {
			//1.要判断是否为根节点
			if(tbItemCat.getIsParent()) {
				CatNode catNode = new CatNode();
//				data下面如果等于0  是第0个元素   那么我们就拼接   这个是第一级
				if(parentId==0) {
					catNode.setName("<a href='/products/"+tbItemCat.getId()+".html'>"+tbItemCat.getName()+"</a>");
				}else {
//					二级节点	否则就能显示的名字  
					catNode.setName(tbItemCat.getName());
				}
				catNode.setUrl("/products/"+tbItemCat.getId()+".html");   //u  拼接
//				应该I 里面还有  N U I   我们用的是递归  自己调用自己
				catNode.setItem(getCatList(tbItemCat.getId()));
				resultList.add(catNode);
			}else {
				//如果为子节点
				resultList.add("/products/"+tbItemCat.getId()+".html|"+tbItemCat.getName());
			}
		}
		
		return resultList;
	}
}

最后写com.foreknow.rest.controller 控制器

JsonController.java

package com.foreknow.rest.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.foreknow.common.util.JsonUtils;
import com.foreknow.rest.pojo.CatResult;
import com.foreknow.rest.service.ItemCatService;

@Controller
public class JsonController {
	@Autowired
	private ItemCatService itemCatService;
	/* 后面的参数表示返回的数据类型是json，字符编码是utf-8
	 * 相当于是.response.setContentType("application/json;charset=UTF-8");
	 */
	@RequestMapping(value="/itemcat/all", produces=MediaType.APPLICATION_JSON_VALUE + ";charset=utf-8")
	@ResponseBody
	public String getItemCatList(String callback) {
		//查询分类列表  调用service 层的查询方法json数据  前台分类（根节点Data）
		CatResult catResult = itemCatService.getItemCatList();
		
		//把pojo转换成一个字符串   //把对象转换成json数据   
		String json = JsonUtils.objectToJson(catResult);
		
		//拼装返回的字符串(js代码片段)  不能直接返回Json  这个callback= category.getDataservice 在lib-v1.js  包装起来
		String result = callback + "(" + json + ");";	
		return result;
	}
}

####总结：rest里的流程 就是把json 数据获取并封装成一个JS脚本 因为为了跨域 让foreknow-protal能访问到 rest 里的数据

###在写foreknow-protal

也一个跳到主页的控制器 com.foreknow.protal.controller

PageController.java

package com.foreknow.protal.controller;

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

@Controller
public class PageController {
	@RequestMapping("/index")
	public String showIndex() {
		return "index";
	}
}

####总结：protal里的核心 在也JS lib-v1.js

1171行代码 找到服务器端口的127.0.0.1:8081 rest 里的Json数据

还有就是 用ajax 发起的异步跨域请求

#可以实现数据库和前框页面的动态处理 http://localhost:8082/

数据库