android+myeclipse+mysql下拉框数据绑定

原创作品，允许转载，转载时请务必声明作者信息和本声明。http://www.cnblogs.com/zhu520/p/8027036.html

本人小白，那个大神看到有问题可指出，谢谢。。。。

一：我使用的工具  myeclipse ，mysql ，Android studio

二：服务器（后台）myeclipse

=================》

1）：先配置先

a: web.xml

这里的  <servlet-mapping> 我多设置一个  <url-pattern>*.json</url-pattern>用来区分是前台还是后台，这是我的习惯，你也可以不要，自己喜欢

<?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">
    <display-name></display-name>
 
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml, classpath:spring-mybatis.xml</param-value>
    </context-param>
 
    <listener>
        <description>spring监听器</description>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
 
    <servlet>
        <description>spring mvc servlet</description>
        <servlet-name>springMvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <description>spring mvc 配置文件</description>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring-mvc.xml</param-value>
        </init-param>
        <init-param>
            <param-name>activeReverseAjaxEnabled</param-name>
            <param-value>true</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
 
<servlet-mapping>
        <servlet-name>springMvc</servlet-name>
        <!-- 此处配置成*.do，对应struts的后缀习惯 -->
        <url-pattern>*.do</url-pattern>
 
          <!-- 此处配置成*.json，是为了能够截获"../*.json"格式的访问（例如android客户端） -->
        <url-pattern>*.json</url-pattern>
    </servlet-mapping>
 
    <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>
 
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
 
</web-app>

web.xml

b： applicationContext.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:aop="http://www.springframework.org/schema/aop"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop-3.1.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.1.xsd
    http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.1.xsd">
    <!-- 开启注解 -->
    <context:annotation-config />
    <!-- 自动扫描 -->
    <context:component-scan base-package="zhu.dao,zhu.service">
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Repository" />
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Service" />
    </context:component-scan>
</beans>

applicationContext.xml

c:jdbc.properties ==>这里的链接mysql ，数据库记得改，看自己的是那个数据库每次

driverClassName=com.mysql.jdbc.Driver
url=jdbc\:mysql\://localhost\:3306/jdbc01?useUnicode\=true&characterEncoding\=utf-8
username=root
password=root
validationQuery=SELECT 1
# \u6570\u636e\u5e93\u914d\u7f6e
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.url=jdbc\:mysql\://localhost\:3306/jdbc01?useUnicode\=true&characterEncoding\=utf-8&zeroDateTimeBehavior\=convertToNull
jdbc.user=root
jdbc.password=root
#\u5305\u6587\u4ef6\u4f4d\u7f6e
targetProject=THIS4
package.model=zhu.po
package.sql.mapper=zhu.mapper
package.dao.mapper=zhu.dao

jdbc.properties

d:log4j.properties

##### \u65e5\u5fd7\u914d\u7f6e\u8d44\u6e90\u6587\u4ef6\uff1a
##### \u63cf\u8ff0\u65e5\u5fd7\u8bb0\u5f55\u76f8\u5173\u914d\u7f6e\u4fe1\u606f
log4j.rootCategory=INFO,stdout,logfile
 
log4j.rootLogger=info,stdout
 
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %c{1}:%L %5p - %m%n
 
log4j.logger.com.netqin=INFO
log4j.logger.org.springframework=INFO
 
log4j.appender.logfile=org.apache.log4j.DailyRollingFileAppender
log4j.appender.logfile.DatePattern='.'yyyy-MM-dd
log4j.appender.logfile.File=F\:/S3S3M3.log
log4j.appender.logfile.layout=org.apache.log4j.PatternLayout
log4j.appender.logfile.layout.ConversionPattern=%d %p [%X{userName}][%X{userLocale}][%c] - <%m>%n

log4j.properties

f:spring-mvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:mvc="http://www.springframework.org/schema/mvc" 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"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-3.1.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd">
 
    <!-- 自动扫描controller包下的所有类，使其认为spring mvc的控制器 -->
    <context:component-scan base-package="zhu.web">
        <context:include-filter type="annotation"
            expression="org.springframework.stereotype.Controller" />
    </context:component-scan>
 
    <!-- 日期转换 必须放在<mvc:annotation-driven />前面 -->
    <bean
        class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"></bean>
 
    <!-- 注解方式 -->
    <mvc:annotation-driven>
    </mvc:annotation-driven>
 
    <!-- 启动Spring MVC的注解功能，完成请求和注解POJO的映射 -->
    <bean
        class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
 
    <!--mvc配置视图解析  -->
    <!-- 对模型视图名称的解析，即在模型视图名称添加前后缀 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" >
        <property name="prefix" value="/WEB-INF/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>
    <!--跳转的时候只用写jsp名字，不用带后缀，因为默认的后缀“.jsp”,路径为“/WEB-INF/jsp”  -->
 
</beans>

spring-mvc.xml

g:spring-mybatis.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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="
    http://www.springframework.org/schema/tx
    http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
    http://www.springframework.org/schema/aop
    http://www.springframework.org/schema/aop/spring-aop-3.1.xsd
    http://www.springframework.org/schema/context
    http://www.springframework.org/schema/context/spring-context-3.1.xsd
    http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.1.xsd">
 
    <!-- ========================================数据库方言========================================= -->
    <!-- properties配置文件 -->
    <bean id="dbProperties"
        class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <!-- 是否忽略不可解析的 -->
        <property name="ignoreUnresolvablePlaceholders" value="true" />
        <property name="locations">
            <list>
                <value>classpath:jdbc.properties</value>
            </list>
        </property>
    </bean>
 
    <!-- ========================================数据源配置========================================= -->
    <!-- 配置数据源，使用的是alibaba的Druid(德鲁伊)数据源 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
        init-method="init" destroy-method="close">
        <property name="url" value="${url}" />
        <property name="username" value="${username}" />
        <property name="password" value="${password}" />
        <!-- 初始化连接大小 -->
        <property name="initialSize" value="0" />
        <!-- 连接池最大使用连接数量 -->
        <property name="maxActive" value="20" />
        <!-- 连接池最大空闲 -->
        <property name="maxIdle" value="20" />
        <!-- 连接池最小空闲 -->
        <property name="minIdle" value="0" />
        <!-- 获取连接最大等待时间 -->
        <property name="maxWait" value="60000" />
        <property name="validationQuery" value="${validationQuery}" />
        <property name="testOnBorrow" value="false" />
        <property name="testOnReturn" value="false" />
        <property name="testWhileIdle" value="true" />
        <!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 -->
        <property name="timeBetweenEvictionRunsMillis" value="60000" />
        <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 -->
        <property name="minEvictableIdleTimeMillis" value="25200000" />
        <!-- 打开removeAbandoned功能 -->
        <property name="removeAbandoned" value="true" />
        <!-- 1800秒，也就是30分钟 -->
        <property name="removeAbandonedTimeout" value="1800" />
        <!-- 关闭abanded连接时输出错误日志 -->
        <property name="logAbandoned" value="true" />
        <!-- 监控数据库 -->
        <!-- <property name="filters" value="stat" /> -->
        <property name="filters" value="mergeStat" />
    </bean>
 
    <!-- ========================================MyBatis的配置项============================== -->
    <!-- 配置sqlSessionFactory -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 实例化sqlSessionFactory时需要使用上述配置好的数据源以及SQL映射文件 -->
        <property name="dataSource" ref="dataSource" />
        <!-- <property name="configLocation" value="classpath:mybatis.cofig.xml" /> -->
        <!-- 自动扫描Mybatis的Mapper.xml文件 -->
        <property name="mapperLocations" value="classpath:zhu/mapper/*.xml" />
    </bean>
 
    <!-- 配置扫描器 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 扫描zhu.dao这个包以及它的子包下的所有映射接口类 -->
        <property name="basePackage" value="zhu.dao" />
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" />
    </bean>
 
    <!-- 配置事务管理器 -->
    <bean id="transactionManager"
        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource" />
    </bean>
 
    <!-- 拦截器方式配置事物 -->
    <tx:advice id="transactionAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="add*" propagation="REQUIRED" />
            <tx:method name="append*" propagation="REQUIRED" />
            <tx:method name="insert*" propagation="REQUIRED" />
            <tx:method name="save*" propagation="REQUIRED" />
            <tx:method name="update*" propagation="REQUIRED" />
            <tx:method name="modify*" propagation="REQUIRED" />
            <tx:method name="edit*" propagation="REQUIRED" />
            <tx:method name="delete*" propagation="REQUIRED" />
            <tx:method name="remove*" propagation="REQUIRED" />
            <tx:method name="repair" propagation="REQUIRED" />
            <tx:method name="delAndRepair" propagation="REQUIRED" />
            <tx:method name="get*" propagation="SUPPORTS" />
            <tx:method name="find*" propagation="SUPPORTS" />
            <tx:method name="load*" propagation="SUPPORTS" />
            <tx:method name="search*" propagation="SUPPORTS" />
            <tx:method name="datagrid*" propagation="SUPPORTS" />
            <tx:method name="*" propagation="SUPPORTS" />
        </tx:attributes>
    </tx:advice>
 
    <aop:config>
        <!-- 配置所有的Advice,使用正则表达式，配置所有类，所有返回值的方法 -->
        <aop:pointcut id="transactionPointcut"
            expression="execution(* zhu.service..*Impl.*(..))" />
        <aop:advisor pointcut-ref="transactionPointcut"
            advice-ref="transactionAdvice" />
    </aop:config>
 
    <!-- 配置druid监控spring jdbc -->
    <bean id="druid-stat-interceptor"
        class="com.alibaba.druid.support.spring.stat.DruidStatInterceptor"></bean>
    <bean id="druid-stat-pointcut" class="org.springframework.aop.support.JdkRegexpMethodPointcut"
        scope="prototype">
        <property name="patterns">
            <list>
                <value>zhu.service.*</value>
            </list>
        </property>
    </bean> 
 
    <aop:config>
        <aop:advisor advice-ref="druid-stat-interceptor"
            pointcut-ref="druid-stat-pointcut" />
    </aop:config>
 
</beans>

spring-mybatis.xml

数据库的表

创建表：

USE jdbc01;

CREATE TABLE tbdept(

did INT PRIMARY KEY AUTO_INCREMENT,

dname VARCHAR(40),

)ENGINE=INNODB DEFAULT CHARSET=utf8;

新增数据

INSERT INTO tbdept ( dname  )  VALUES ( 'A部门' );

INSERT INTO tbdept ( dname  )  VALUES ( 'B部门' );

INSERT INTO tbdept ( dname  )  VALUES ( 'C部门' );

2):代码

• a）：po层

package zhu.po;
 
public class Tbdept {
    private Integer did;
 
    private String dname;
 
    public Integer getDid() {
        return did;
    }
 
    public void setDid(Integer did) {
        this.did = did;
    }
 
    public String getDname() {
        return dname;
    }
 
    public void setDname(String dname) {
        this.dname = dname;
    }
}

Tbdept.java

• b):mapper(映射)

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
 
<!--namespace命令空间，作用就是对sql进行分类化管理，理解sql隔离
注意：使用mapper代理方法开发，namepace有特殊重要的作用
  -->
<mapper namespace="zhu.dao.TbempMapper" >
  <resultMap id="BaseResultMap" type="zhu.po.Tbdept" >
    <id column="did" property="did" jdbcType="INTEGER" />
    <result column="dname" property="dname" jdbcType="VARCHAR" />
  </resultMap>
  <sql id="Base_Column_List" >
    did, dname
  </sql>
 <select id="query_tbDept" resultType="zhu.po.Tbdept" >
 SELECT did,dname FROM  tbdept
 </select>
 
</mapper>

TbdeptMapper.xml

• c):dao层

package zhu.dao;
 
import java.util.List;
 
import org.springframework.stereotype.Repository;
 
import zhu.po.Tbdept;
 
@Repository(value = "tbemdao")
public interface TbempMapper {
 
    List<Tbdept> query_tbDept ();
 
}

• d):service

package zhu.service;
 
import java.util.List;
 
import zhu.po.Tbdept;
 
public interface I_tbenService {
    List<Tbdept> query_tbDept ();
}

package zhu.service.impl;
 
import java.util.List;
 
import javax.annotation.Resource;
 
import org.springframework.stereotype.Service;
 
import zhu.dao.TbempMapper;
import zhu.po.Tbdept;
import zhu.service.I_tbenService;
 
@Service
public class TbempService_Impl implements I_tbenService {
 
    @Resource(name="tbemdao")
    private TbempMapper my_tbemp;
 
    @Override
    public List<Tbdept> query_tbDept() {
        // TODO Auto-generated method stub
        return my_tbemp.query_tbDept();
    }
 
}

• f):web

package zhu.web;
 
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
 
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletResponse;
 
import net.sf.json.JSONObject;
 
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
 
import zhu.po.Tbdept;
import zhu.service.I_tbenService;
 
@Controller
@RequestMapping("/Binding_Cbo")
public class Binding_Cbo {
 
    @Autowired
    private I_tbenService my_TbenService;
 
    @RequestMapping(value="/android_cbo.json",produces="application/json")
    public void android_cbo(HttpServletResponse response)throws ServletException, IOException{
        JSONObject json = new JSONObject();
        PrintWriter writer = response.getWriter();
        List<Tbdept> cbo_bm= my_TbenService.query_tbDept();
        json.put("cbo_bm", cbo_bm);
        writer.write(json.toString());
        writer.close();
    }
}

然后检查一下 是否能成功 运行

三：Android studio

• a);先进行准备前工作先 在build.gradle四个地方要加入代码

// Top-level build file where you can add configuration options common to all sub-projects/modules.
 
buildscript {
    repositories {
        jcenter()
        // add plugin
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.3.3'
        classpath 'org.greenrobot:greendao-gradle-plugin:3.2.2' // add plugin
        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
}
 
allprojects {
    repositories {
        jcenter()
    }
}
 
task clean(type: Delete) {
    delete rootProject.buildDir
}

build.gradle

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

// 这个非常重要，会生成Dao的类
greendao {    //add plugin
    schemaVersion 2
    //生成greedao的对象类的路径   

设置DaoMaster,DaoSession,Dao包的路径，我不太喜欢它原来的路径，每次找都很麻烦，所以把它放在一个自己方便看的路径下来，你也可以不要下面这两句!
    daoPackage 'zhu.com.sprnner_cbo.greendao'
    targetGenDir 'src/main/java'//保存到java代码路径   ==》这句你可以不要
}

如果没有这俩句，那么DaoMaster,DaoSession,Dao的原路径是在这里的

有这俩句，那么DaoMaster,DaoSession,Dao那么路径挺好找的

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

apply plugin: 'com.android.application'
apply plugin: 'org.greenrobot.greendao'//add plugin
android {
    compileSdkVersion 26
    buildToolsVersion "26.0.1"
    defaultConfig {
        applicationId "zhu.com.sprnner_cbo"
        minSdkVersion 19
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}
// 这个非常重要，会生成Dao的类
greendao {    //add plugin
    schemaVersion 2
    //生成greedao的对象类的路径   ==》我不太喜欢它原来的路径，所以把它放在一个自己方便看的路径下来,所以这句你可以不要!
    daoPackage 'zhu.com.sprnner_cbo.greendao'
    targetGenDir 'src/main/java'//保存到java代码路径   ==》这句你可以不要
}
dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:26.+'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    compile 'com.loopj.android:android-async-http:1.4.9'// add library==》这个是添加 网络请求的插件
    compile 'org.greenrobot:greendao:3.2.2' // add library  ==>这个是 添加 greedao插件
    testCompile 'junit:junit:4.12'
}

build.gradle

b):因为需要网络的请求 所以 要必须 要在AndroidManifest.xml加一句代码，不加就会出现下面这种错误的情况

12-26 02:45:25.969 5267-5334/zhu.com.sprnner_cbo W/System.err: java.net.SocketException: Permission denied
12-26 02:45:25.970 5267-5334/zhu.com.sprnner_cbo W/System.err:     at java.net.Socket.createImpl(Socket.java:473)
12-26 02:45:25.970 5267-5334/zhu.com.sprnner_cbo W/System.err:     at java.net.Socket.getImpl(Socket.java:536)
12-26 02:45:25.971 5267-5334/zhu.com.sprnner_cbo W/System.err:     at java.net.Socket.setSoTimeout(Socket.java:1127)
12-26 02:45:25.971 5267-5334/zhu.com.sprnner_cbo W/System.err:     at cz.msebera.android.httpclient.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:116)
12-26 02:45:25.971 5267-5334/zhu.com.sprnner_cbo W/System.err:     at cz.msebera.android.httpclient.conn.scheme.PlainSocketFactory.connectSocket(PlainSocketFactory.java:157)
12-26 02:45:25.971 5267-5334/zhu.com.sprnner_cbo W/System.err:     at cz.msebera.android.httpclient.conn.scheme.SchemeSocketFactoryAdaptor.connectSocket(SchemeSocketFactoryAdaptor.java:65)
12-26 02:45:25.972 5267-5334/zhu.com.sprnner_cbo W/System.err:     at cz.msebera.android.httpclient.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:177)
12-26 02:45:25.972 5267-5334/zhu.com.sprnner_cbo W/System.err:     at cz.msebera.android.httpclient.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:145)
12-26 02:45:25.972 5267-5334/zhu.com.sprnner_cbo W/System.err:     at cz.msebera.android.httpclient.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:131)
12-26 02:45:25.972 5267-5334/zhu.com.sprnner_cbo W/System.err:     at cz.msebera.android.httpclient.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:611)
12-26 02:45:25.973 5267-5334/zhu.com.sprnner_cbo W/System.err:     at cz.msebera.android.httpclient.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:446)
12-26 02:45:25.973 5267-5334/zhu.com.sprnner_cbo W/System.err:     at cz.msebera.android.httpclient.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:860)
12-26 02:45:25.973 5267-5334/zhu.com.sprnner_cbo W/System.err:     at cz.msebera.android.httpclient.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
12-26 02:45:25.973 5267-5334/zhu.com.sprnner_cbo W/System.err:     at com.loopj.android.http.AsyncHttpRequest.makeRequest(AsyncHttpRequest.java:146)
12-26 02:45:25.974 5267-5334/zhu.com.sprnner_cbo W/System.err:     at com.loopj.android.http.AsyncHttpRequest.makeRequestWithRetries(AsyncHttpRequest.java:177)
12-26 02:45:25.974 5267-5334/zhu.com.sprnner_cbo W/System.err:     at com.loopj.android.http.AsyncHttpRequest.run(AsyncHttpRequest.java:106)
12-26 02:45:25.974 5267-5334/zhu.com.sprnner_cbo W/System.err:     at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:428)
12-26 02:45:25.974 5267-5334/zhu.com.sprnner_cbo W/System.err:     at java.util.concurrent.FutureTask.run(FutureTask.java:237)
12-26 02:45:25.975 5267-5334/zhu.com.sprnner_cbo W/System.err:     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
12-26 02:45:25.975 5267-5334/zhu.com.sprnner_cbo W/System.err:     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
12-26 02:45:25.975 5267-5334/zhu.com.sprnner_cbo W/System.err:     at java.lang.Thread.run(Thread.java:761)

错误情况

好了配置弄好剩下的就 很好解决了

c):代码

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="zhu.com.sprnner_cbo.MainActivity">
 
    <Spinner
        android:id="@+id/kj_spinner_tbmep"
        android:layout_width="240dp"
        android:layout_height="30dp"
        android:layout_margin="5dp"
        android:background="@drawable/etitext_frame_radiuo"
        android:spinnerMode="dialog"
        android:entries="@array/cbo_tbmep"
        />
 
</RelativeLayout>

activity_main.xml

d):设置实体类：

实体类 要根据返回的json中 相对于的key 一一对应

注意：   主键：id必须要设置Long的类型 ，切记 必须要加入  @Entity， 和@Id

设置好变量后 ，还有一个操作 设置 生成DaoMaster,DaoSession,Dao类的操作，这它就会自动补全我们实体类剩下的get和set的方法了

================生成的========》

    最后在实体类中再加 一个方法 得到 从 服务器专递的json的数据
    // 将json ==>转化为 Bean的对象（即Tb_Cbo_CLDL的对象）
    public static  Tbmep json_To_Bean(JSONObject object){
        try {
            return  new Tbmep(object.getLong("did"),
                    object.getString("dname")
            );
        }catch (Exception e){   }
        return  null;
    }

 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~··

package zhu.com.sprnner_cbo;
 
import org.greenrobot.greendao.annotation.Entity;
import org.greenrobot.greendao.annotation.Id;
import org.greenrobot.greendao.annotation.Generated;
import org.json.JSONObject;
 
/**
 * Created by XiaoZhu on 2017/12/14.
 */
@Entity
public class Tbmep {
   @Id
    private Long did;
    private String dname;
 
   @Generated(hash = )
   public Tbmep(Long did, String dname) {
       this.did = did;
       this.dname = dname;
   }
   @Generated(hash = )
   public Tbmep() {
   }
   public Long getDid() {
       return this.did;
   }
   public void setDid(Long did) {
       this.did = did;
   }
   public String getDname() {
       return this.dname;
   }
   public void setDname(String dname) {
       this.dname = dname;
   }
 
    // 将json ==>转化为 Bean的对象（即Tb_Cbo_CLDL的对象）
    public static  Tbmep json_To_Bean(JSONObject object){
        try {
            return  new Tbmep(object.getLong("did"),
                    object.getString("dname")
            );
        }catch (Exception e){   }
        return  null;
    }
}

MainActivity

package zhu.com.sprnner_cbo;
 
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;
 
import com.loopj.android.http.AsyncHttpClient;
import com.loopj.android.http.AsyncHttpResponseHandler;
 
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
 
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
 
import cz.msebera.android.httpclient.Header;
import cz.msebera.android.httpclient.HttpResponse;
import cz.msebera.android.httpclient.NameValuePair;
import cz.msebera.android.httpclient.client.entity.UrlEncodedFormEntity;
import cz.msebera.android.httpclient.client.methods.HttpPost;
import cz.msebera.android.httpclient.impl.client.DefaultHttpClient;
import cz.msebera.android.httpclient.message.BasicNameValuePair;
 
public class MainActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener {
    private Spinner  btn_spinner_tbmep;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn_spinner_tbmep = (Spinner) findViewById(R.id.kj_spinner_tbmep);
        btn_spinner_tbmep.setOnItemSelectedListener(MainActivity. this);//成品尺寸
    }
 
    /**
     * 如果使用 类 实现==>这个的 implements AdapterView.OnItemSelectedListener
     * ，那么就必须要复写下面这个方法onItemSelected()
     * onNothingSelected()
     * @param adapterView
     * @param view
     * @param i
     * @param l
     */
    @Override //成功干嘛
    public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
        switch (adapterView.getId()){
            case R.id.kj_spinner_tbmep: //kj_spinner_tbmep ==>这个是 控件的  id名称
                cbo_tbmep();
                break;
        }
    }
    @Override  //不成功干嘛
    public void onNothingSelected(AdapterView<?> adapterView) {
 
    }
 
    //==>这是系统自带的 下拉框
    private List<String> list_Cbo_str=null;// 接受string的数据
    List<Tbmep> list_cboBinding=null;//接收 TbCboCLDL对象的数据
    ArrayAdapter<String> arrayAdapter=null;
    int tbmepId=0;//接收ID
    //访问后台的 封面纸张的 链接
    public void cbo_tbmep(){
        AsyncHttpClient client =new AsyncHttpClient();
        //第一个参数是访问 后台的路径，第二是：参数根据 id获取 string 查询数据 ，第三个:回调函数
        client.get("http://192.168.191.2:8080/2017_1214_cbo/Binding_Cbo/android_cbo.json", null, new AsyncHttpResponseHandler() {
            @Override
            public void onSuccess(int statusCode, Header[] headers, byte[] responseBody) {
                if (statusCode==200){
                    try {
                        JSONObject object = new JSONObject(new String(responseBody));//获取json数据
                        JSONArray jsonArray = object.getJSONArray("cbo_bm");//获取数据集名称为obj的数据
                        Log.d("jsonArray数据输出：", String.valueOf(jsonArray));
                        list_cboBinding = new ArrayList<>();
                        for(int i=0;i<jsonArray.length();i++){
                            //把 json 转换为 ==》bean的对象形式
                            Tbmep cbo=Tbmep.json_To_Bean(jsonArray.getJSONObject(i));
                            if (cbo!=null){
                                list_cboBinding.add(cbo);//把对象放入 list的数组中
                            }
                        }
                        //判断是否有数据
                        if (jsonArray.length() > 0) {
                            list_Cbo_str = new ArrayList<>();
                            for (int i = 0; i < list_cboBinding.size(); i++) {
                                Tbmep section = list_cboBinding.get(i);
                                list_Cbo_str.add(section.getDname());
                            }
                            //1.为下拉列表定义一个数组适配器，这个数组适配器就用到里前面定义的list。装的都是list所添加的内容 android.R.layout.simple_spinner_item==》这是系统本来就有的哦
                            arrayAdapter = new ArrayAdapter<>(MainActivity.this, android.R.layout.simple_spinner_item, list_Cbo_str);
                            //2.为适配器设置下拉菜单样式。android.R.layout.simple_list_item_single_choice==》Android系统自带样式
                            arrayAdapter.setDropDownViewResource(android.R.layout.simple_list_item_single_choice);
                            //3.以上声明完毕后，建立适配器,有关于sipnner这个控件的建立。用到kj_user_fm_spinner_papers2
                            btn_spinner_tbmep.setAdapter(arrayAdapter);
                            //4.为下拉列表设置各种点击事件，以响应菜单中的文本item被选中了，用setOnItemSelectedListener
                            btn_spinner_tbmep.setOnItemSelectedListener(new Spinner.OnItemSelectedListener() {//选择item的选择点击监听事件
                                public void onItemSelected(AdapterView<?> parent, View view, int position, long id)  {
                                    tbmepId=0;
                                    tbmepId =list_cboBinding.get((int) id).getDid().intValue();//获取id
                                    arrayAdapter.getItem(position);//==》获取选择的项目名称
                                }
                                public void onNothingSelected(AdapterView<?> parent ) {
                                }
                            });
 
                        }
                    }
                    catch (JSONException e) {
                        Toast.makeText(MainActivity.this, "下拉框加载失败！", Toast.LENGTH_SHORT).show();
                    }
                }else if(statusCode==400){
                    Toast.makeText(MainActivity.this, "若返回值400，则是返回网络异常！", Toast.LENGTH_SHORT).show();
                }
            }
 
            @Override
            public void onFailure(int statusCode, Header[] headers, byte[] responseBody, Throwable error) {
                Toast.makeText(MainActivity.this, "请求网络失败！", Toast.LENGTH_SHORT).show();
            }
        }) ;
    }
 
}

好了，上面的就是我 绑定Android下拉框所有的代码了

运行时必须要先运行后台服务器，要不根本跑不起来，还有如果使用真机必须要使用同一个wifi

运行效果：

因为每次想下载的时候CSDN都要资源分而我刚好没有，所以我把我这次的源码放到了CSDN上。。。。上面的代码是已经齐的了，如果实在不想下载，那你可以去我之前的http://www.cnblogs.com/zhu520/p/7883273.html 下载 ssm ,去 里面找 jar 即可

源码：http://download.csdn.net/download/qq_35812301/10174004