前台系统架构
image.png分层的架构有什么好处:
- 有利于系统的维护,扩展。
- 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。
- 灵活性
- 前台系统与服务层可以分离
- 开发团队可以分开,提高开发效率
缺点:
- 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:
- 服务层的web工程 功能就是发布服务
- 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
- Mybatis
- Spring
- 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:
- Spring+SpringMVC
- JS CSS JQuery Bootstrap AngularJS NodeJS React H5
- HttpClient
实现商品分类的展示流程
image.png image.pngProtal-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
image.png
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
- 什么是跨域?
a) 域名不同
b) 域名相同但是端口不同 - 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
- Jsonp的原理:
浏览器在js请求的时候,是可以通过<script>标签中的src来跨域的请求,Js是不能够进行跨域请求数据的,但是js可以跨域请求js的脚本。得到这个js脚本之后就会立即执行的。那么我主可以把数据作为参数传递到方法中,就可以得到数据了。从而解决了跨域访问的问题。
$.getJSONP(this.URL_Serv, category.getDataService);
它有两个参数:第一个参数是请求的url,第二个参数是要调用的方法。所以我们在category.json中是用category.getDataService()把数据包装起来的,作为参数。然后这个json中的数据就会变成一个js的脚本片段。那么该js片段在传回调用方法里的时候就会立即执行。相当于执行的category.getDataService()方法。会把json数据当成参数。
图二
image
创建foreknow-rest 也是继承parent
image.png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>
image.png
设置run configurations 服务器
image.png image.png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
image.pngSqlMapConfig.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>
image.png
image.png
接下来 创建一个maven工程 foreknow-protal 继承parent
image.png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
image.pngresource.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
image.png image.png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
image.png1171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
image.png可以实现数据库和前框页面的动态处理 http://localhost:8082/
image.png数据库
image.png
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