笔记（json）实现前后端交互案例

1：首先创建一个项目如：（说明：此项目是在eclipse创建的）

2.在创建相对应的包如：

3.创建写好相对应的配置文件如：

applicationContext.xml具体内容如下：

<?xml version=”1.0″ encoding=”UTF-8″?>
<beans xmlns=”http://www.springframework.org/schema/beans”
xmlns:context=”http://www.springframework.org/schema/context”
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.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
“>
<!–自动注入processor解释器(此行不写)–>
<context:annotation-config></context:annotation-config>
<!–自动扫描包–>
<context:component-scan base-package=”com.nf”></context:component-scan>

<!–加载JDBC的配置文件–>
<context:property-placeholder location=”classpath:jdbc.properties”></context:property-placeholder>

<!–构造SessionFactory,需要3项内容：1.连接 2.配置 3.实体类映射关系–>
<bean id=”sessionFactory” class=”org.springframework.orm.hibernate5.LocalSessionFactoryBean”>
<!–1.数据库连接池–>
<property name=”dataSource” ref=”myDataSource”></property>
<!–2.相关hibernate的配置信息–>
<property name=”hibernateProperties”>
<props>
<prop key=”hibernate.dialect”>org.hibernate.dialect.MySQL57InnoDBDialect</prop>
<prop key=”hibernate.show_sql”>true</prop>
<prop key=”hibernate.format_sql”>true</prop>
<prop key=”hibernate.connection.autocommit”>false</prop>
<prop key=”hibernate.hbm2ddl.auto”>update</prop>
</props>
</property>
<!–3.实体类映射关系–>
<property name=”packagesToScan” value=”com.nf”></property>
</bean>

<!–事务管理器配置，Hibernate单数据源事务–>
<bean id=”defaultTransactionManager” class=”org.springframework.orm.hibernate5.HibernateTransactionManager”>
<property name=”sessionFactory” ref=”sessionFactory”></property>
</bean>
<!–使用注解annotation定义事务–>
<tx:annotation-driven transaction-manager=”defaultTransactionManager” ></tx:annotation-driven>

</beans>

具体内容如下：（这是与MySQL数据库连接的配置）

#database information
driverClass=com.mysql.cj.jdbc.Driver
jdbcUrl=jdbc:mysql://localhost:3306/lib?serverTimezone=UTC
user=root
password=

struts.xml配置文件如下：

<?xml version=”1.0″ encoding=”UTF-8″?>

<!DOCTYPE struts PUBLIC
“-//Apache Software Foundation//DTD Struts Configuration 2.5//EN”
“http://struts.apache.org/dtds/struts-2.5.dtd”>

<struts>
<constant name=”struts.objectFactory” value=”spring”></constant>
<package name=”myPackage” extends=”struts-default,json-default”>
<action name=”bookAction_*” class=”bookAction” method=”{1}”>
<result type=”json” name=”jsonOK”>
<param name=”root”>jsonMap</param>
</result>
<allowed-methods>getAllBook</allowed-methods>
</action>

</package>
</struts>

配置web.xml过滤文件

web.xml具体内容如下：

<?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_3_1.xsd”
id=”WebApp_ID” version=”3.1″>
<display-name>Archetype Created Web Application</display-name>
<!–2个struts的过滤器–>
<filter>
<filter-name>struts-prepare</filter-name>
<filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareFilter</filter-class>
</filter>
<filter>
<filter-name>struts-execute</filter-name>
<filter-class>org.apache.struts2.dispatcher.filter.StrutsExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>struts-prepare</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<filter-mapping>
<filter-name>struts-execute</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<!–1个spring的监听器–>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>

</web-app>

4.在web目录下创建个js文件夹来存放这俩个js文件（注：这俩个文件是第三方的js文件）：

在webContext目录下建个jsp文件，如：test.jsp

(具体内容如下：)

<%@ page language=”java” contentType=”text/html; charset=UTF-8″
pageEncoding=”UTF-8″%>
<!DOCTYPE html PUBLIC “-//W3C//DTD HTML 4.01 Transitional//EN” “http://www.w3.org/TR/html4/loose.dtd”>
<html>
<head>
<meta http-equiv=”Content-Type” content=”text/html; charset=UTF-8″>
<title>Insert title here</title>
</head>
<body>
<table border=”1px” id=”myView”>
<tr>
<th>ID</th>
<th>书名</th>
<th>价格</th>
</tr>
<tr v-for=”book in bookList”>
<td>{{book.id}}</td>
<td>{{book.name}}</td>
<td>{{book.price}}</td>
</tr>
</table>
</body>
<script src=”${pageContext.request.contextPath}/js/vue.js”></script>
<script src=”${pageContext.request.contextPath}/js/jquery-3.2.1.min.js”></script>
<script type=”text/javascript”>
var myModel = {bookList:[]};
var myViewModel = new Vue({
el:”#myView” ,
data:myModel

}) ;
/*
var myViewModel = new Vue({
el:’#myView’,
data:myModel
});
*/
//写成函数的目的，为了【复用】
function getData(){
$.ajax({
url:”bookAction_getAllBook”, //后端的API地址
type:’GET’, //http:POST/GET
//data:postData, //指客户端提交给后台的参数
dataType:’json’, //服务端返回类型text,json
timeout:3000,
success:function(result){
//alert(result);
//$.extend(true, result, myModel);
//失败
//myViewModel.data = result;
//失败
//myModel = result;
myModel.bookList = result.bookList ;

},
error:function(){
alert(‘服务器忙，请不要说脏话，理论上大家都是文明人’);
}
});
}
getData();

</script>
</html>

6.开始在src目录下写后台代码了

先从开始：

创建Book.java文件

具体内容如下：

package com.nf.entity;

import javax.persistence.*;

@Entity
@Table(name = “book”)
public class Book {
private Integer id;
private String name;
private Integer price;

@Id
@GeneratedValue(strategy= GenerationType.IDENTITY)
@Column(name=”id”)
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}

@Column(name = “name”,length = 50,nullable = false)
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}

@Column(name = “price”,nullable = false)
public Integer getPrice() {
return price;
}
public void setPrice(Integer price) {
this.price = price;
}

}

然后在创建dao模层，

先创建个BookDao接口，具体内容如下：

package com.nf.dao;

import com.nf.entity.Book;

import java.util.List;

public interface BookDao {

public List<Book> getAllBook();

}

在创建个BookDaoImpl类并实现BookDao接口，内容如下：

package com.nf.dao;

import com.nf.entity.Book;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.query.Query;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Repository;

import java.util.List;

@Repository
@Scope(“prototype”)
public class BookDaoImpl implements BookDao {

@Autowired
private SessionFactory sessionFactory;

public List<Book> getAllBook() {
Session session = sessionFactory.getCurrentSession();
Query<Book> query = session.createQuery(“from Book”, Book.class);
List<Book> bookList = query.getResultList();

return bookList;
}
}

最后写模块

（具体内容如下：）

package com.nf.action;

import com.nf.entity.Book;
import com.nf.service.BookService;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Scope;
import org.springframework.stereotype.Controller;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Controller
@Scope(“prototype”)
public class BookAction extends ActionSupport {

//姝sonMap鐢ㄤ簬瀛樺偍JSON鏍煎紡鐨勬暟鎹�
private Map<String,Object> jsonMap = new HashMap();
public Map<String, Object> getJsonMap() {
return jsonMap;
}
public void setJsonMap(Map<String, Object> jsonMap) {
this.jsonMap = jsonMap;
}

@Autowired
private BookService bookService;

public String getAllBook(){
List<Book> bookList = bookService.getAllBook();
jsonMap.put(“bookList”, bookList);
return “jsonOK”;
}
}

好了，到这里整个案例已经完成了，一来可以作为我以后复习的笔记，二来希望可以帮助到在这方面学习的朋友，做的不够精细，请多多包含，勿喷！！

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