Mongodb学习笔记(三)

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MongoDB学习笔记三：MongoDB集群环境搭建 MongDB学习笔记三：MongDB集群环境搭建标签（空格分隔）： MongDB一、集群搭建简介 为什么使用集群架构？ 主从：故障转移:无法实现,如果主机宕机，需要关闭slave并且按照master模式启动。无法解决单点故障 无法autofailover 不可以自动主从的切换 为了解决主从的问题，MongDB3.0之后出现副本集，副本集解决了故障转移的问题，但是一个副本集中的 阅读详情
AI摘要

本文详细介绍了一个项目中集成MongoDB的过程，包括配置文件、DAO层实现、文件上传及读取的具体实现等，并通过实例展示了如何使用MongoDB进行数据操作。

这里是ynb中Mongodb的使用：

（1）在pom.xml：

<profiles>
	<!-- ================= Database Profiles ================= -->
	<profile>
		<id>test</id>   
		<activation>
			<activeByDefault>true</activeByDefault>
		</activation>
		<properties>
			<jdbc.url>jdbc:mysql://10.18.96.16:3306/ynb_test?createDatabaseIfNotExist=true&amp;useUnicode=true&amp;characterEncoding=utf-8&amp;autoReconnect=true</jdbc.url>
			<jdbc.username>njb</jdbc.username>     
			<jdbc.password>njb2015</jdbc.password>
			<mongodb.url>10.18.97.32:27017</mongodb.url>
			<mongodb.dbname>db</mongodb.dbname>
			<mongodb.username/>
			<mongodb.password/>
			<redis.host>10.18.97.32</redis.host>
			<redis.port>6379</redis.port>
			<redis.keyword.ip>10.18.97.32</redis.keyword.ip>
			<redis.keyword.port>6379</redis.keyword.port>
			<zookeeper.ip>10.18.97.32</zookeeper.ip>
			<zookeeper.cliport>2181</zookeeper.cliport>
			....//省略很多组件
		</properties>
	</profile>
</profiles>

<dependencies>
	<dependency>
		<groupId>org.mongodb</groupId>
		<artifactId>mongo-java-driver</artifactId>
		<version>2.12.2</version>
	</dependency>	
	<dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-mongodb</artifactId>
            <version>1.3.0.RELEASE</version>
        </dependency>
</dependencies>

（2）applicationContext-resources.xml中： 

<?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:mongo="http://www.springframework.org/schema/data/mongo"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:jee="http://www.springframework.org/schema/jee"
       xmlns:cache="http://www.springframework.org/schema/cache"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:drools="http://drools.org/schema/drools-spring"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:c="http://www.springframework.org/schema/c"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
       		http://www.springframework.org/schema/data/mongo	http://www.springframework.org/schema/data/mongo/spring-mongo-1.0.xsd
            http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-2.0.xsd
            http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache.xsd
            http://www.springframework.org/schema/aop   
           http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
           http://drools.org/schema/drools-spring 
		   http://drools.org/schema/drools-spring-1.3.0.xsd
           http://www.springframework.org/schema/context 
           http://www.springframework.org/schema/context/spring-context.xsd">

    <!-- For mail settings and future properties files -->
    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="ignoreUnresolvablePlaceholders" value="true"/>
        <property name="locations">
            <list>
                <value>classpath:jdbc.properties</value>
                <value>classpath:hibernate.properties</value>
                <value>classpath:redis.properties</value>
            </list>
        </property>
    </bean>

    <!-- JNDI DataSource for J2EE environments -->
    <!--<jee:jndi-lookup id="dataSource" jndi-name="java:comp/env/jdbc/appfuse"/>-->

    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" destroy-method="close">
       <!--   <property name="driverClassName" value="${jdbc.driverClassName}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/> -->
        
        <property name="driverClassName" value="${jdbc.driverClassName}"/>
        
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        
        <property name="maxActive" value="350"/>
        <property name="maxWait" value="10000"/>
        <property name="poolPreparedStatements" value="true"/>
        <property name="defaultAutoCommit" value="true"/>
        <property name="validationQuery" value="SELECT 1+1"/>
        <property name="testOnBorrow" value="true"/>
        <property name="filters" value="stat" /> 
        <!--申请连接的时候检测，如果空闲时间大于timeBetweenEvictionRunsMillis，执行validationQuery检测连接是否有效。 -->
		<property name="testWhileIdle" value="true" />
		<property name="timeBetweenEvictionRunsMillis" value="10000" />
    </bean>

	<bean id="jedisPoolConfig" class="com.eshore.framework.util.JedisPoolConfigWrapper">
		<!--最大连接数 -->
		<property name="maxActive" value="50" />
		<!--最大空闲连接数 -->
		<property name="maxIdle" value="5" />
		<!--初始化连接数 -->
		<property name="minIdle" value="1" />
		<!--最大等待时间 -->
		<property name="maxWait" value="5000" />
		<!--对拿到的connection进行validateObject校验 -->
		<property name="testOnBorrow" value="true" />
		<!--在进行returnObject对返回的connection进行validateObject校验 -->
		<property name="testOnReturn" value="true" />
		<!--定时对线程池中空闲的链接进行validateObject校验 -->
		<property name="testWhileIdle" value="true" />
	</bean>
	
	<bean id="jedisPool" class="redis.clients.jedis.JedisPool" destroy-method="destroy">
	     <constructor-arg index="0">
	            <bean factory-bean="jedisPoolConfig" factory-method="getConfig"/>
	     </constructor-arg>
        <constructor-arg index="1" value="${redis.host}"/>
	</bean>
	
    <!-- <mongo:mongo host="${mongodb.url}" port="${mongodb.port}"/> -->
	<mongo:mongo replica-set="${mongodb.url}">
	    <mongo:options
		 connections-per-host="800"
		 threads-allowed-to-block-for-connection-multiplier="5"
		 max-wait-time="7000" 
         connect-timeout="7000" 
		 write-fsync="true"
		 />
	</mongo:mongo>    	
		
	<mongo:db-factory dbname="${mongodb.dbname}" username="${mongodb.username}" password="${mongodb.password}" mongo-ref="mongo" />
     
    <bean id="mappingContext" class="org.springframework.data.mongodb.core.mapping.MongoMappingContext" />

    <bean id="defaultMongoTypeMapper" class="org.springframework.data.mongodb.core.convert.DefaultMongoTypeMapper">
        <constructor-arg name="typeKey"><null /></constructor-arg>
    </bean>
    
    <bean id="mappingMongoConverter" class="org.springframework.data.mongodb.core.convert.MappingMongoConverter">
        <constructor-arg name="mongoDbFactory" ref="mongoDbFactory" />
        <constructor-arg name="mappingContext" ref="mappingContext" />
        <property name="typeMapper" ref="defaultMongoTypeMapper" />
    </bean>

    <bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
        <constructor-arg name="mongoDbFactory" ref="mongoDbFactory" />
        <constructor-arg name="mongoConverter" ref="mappingMongoConverter" />
    </bean>
    

    <bean id="cacheManager" class="org.springframework.cache.ehcache.EhCacheCacheManager" p:cache-manager-ref="ehcache"/>
	<bean id="ehcache" class="org.springframework.cache.ehcache.EhCacheManagerFactoryBean" p:config-location="classpath:ehcache.xml" p:shared="true"/>
  
</beans>

（3）MongoDBDaoImpl： 

package com.eshore.framework.dao.mongodb;
import java.util.ArrayList;
import java.util.List;
import org.apache.log4j.Logger;
import org.bson.types.ObjectId;
import org.springframework.data.mongodb.core.MongoTemplate;
import com.mongodb.BasicDBObject;
import com.mongodb.DB;
import com.mongodb.DBCollection;
import com.mongodb.DBCursor;
import com.mongodb.DBObject;
public class MongoDBDaoImpl implements MongoDBDao {

    Logger log = Logger.getLogger(MongoDBDaoImpl.class);

    private MongoTemplate mongoTemplate;

    @Override
    public List getAll(String collectionName) {
        DB db = mongoTemplate.getDb();
        List list = new ArrayList();
        DBCollection coll = db.getCollection(collectionName);
        DBCursor cursor = coll.find();
        try {
            while (cursor.hasNext()) {
                DBObject object = cursor.next();
                list.add(object);
            }
        } finally {
            cursor.close();
        }
        return list;
    }

    @Override
    public void delete(String collectionName, String id) {
        DB db = mongoTemplate.getDb();
        DBCollection coll = db.getCollection(collectionName);
        coll.remove(new BasicDBObject("_id", new ObjectId(id)));
    }

    @Override
    public DBObject findOne(String collectionName, String id) {
        DB db = mongoTemplate.getDb();
        DBCollection coll = db.getCollection(collectionName);
        return coll.findOne(new BasicDBObject("_id", new ObjectId(id)));
    }

    public void setMongoTemplate(MongoTemplate mongoTemplate) {
        this.mongoTemplate = mongoTemplate;
    }

    public MongoTemplate getMongoTemplate() {
        return mongoTemplate;
    }

    @Override
    public List getList(String collectionName, BasicDBObject query,
        PageInfo pageInfo) {
        DB db = mongoTemplate.getDb();
        DBCollection coll = db.getCollection(collectionName);
        if (pageInfo.getSortDirection() == pageInfo.SORT_DIRECTION_DESC) {
            pageInfo.setSortDirection(-1);
        }
        DBCursor cursor = coll.find(query).sort(
            new BasicDBObject(pageInfo.getSortField(), pageInfo
                .getSortDirection()));
        List list = new ArrayList();
        try {
            while (cursor.hasNext()) {
                DBObject object = cursor.next();
                list.add(object);
            }
        } finally {
            cursor.close();
        }
        return list;
    }

    @Override
    public List getAll(String collectionName, BasicDBObject query) {
        DB db = mongoTemplate.getDb();
        List list = new ArrayList();
        DBCollection coll = db.getCollection(collectionName);
        DBCursor cursor = coll.find(query);
        try {
            while (cursor.hasNext()) {
                DBObject object = cursor.next();
                list.add(object);
            }
        } finally {
            cursor.close();
        }
        return list;
    }

}

（3.5）一个使用了MongoDBDao的例子：

 UserLogServiceImpl中：   
 /**
     * 查询用户日志
     *
     * @param requestBean
     * @return
     */
    @Override
    public Page<AppUserLogVo> queryAppUserLogList(AppUserLogRequestBean requestBean, PageInfo pageInfo) {
        if (StringUtils.isBlank(pageInfo.getSortField())) {
            pageInfo.setSortField("operateTime");
            pageInfo.setSortDirection(pageInfo.SORT_DIRECTION_DESC);
        }
        BasicDBObject query = new BasicDBObject();
        List<AppUserLogVo> logVoList = new ArrayList<AppUserLogVo>();

        if (requestBean != null && StringUtils.isNotBlank(requestBean.getMobileNo())) {
            Pattern pattern = Pattern.compile("^.*" + requestBean.getMobileNo() + ".*$", Pattern.CASE_INSENSITIVE);
            query.put("puppetMobileNo", pattern);
        }

        DB db = mongoDBDao.getMongoTemplate().getDb();
        DBCollection coll = db.getCollection(COLLECTION_NAME);
        DBCursor cursor = coll.find(query).skip(pageInfo.getPageNum() * pageInfo.getPageSize()).limit((pageInfo.getPageNum() + 1) * pageInfo.getPageSize());
        if (StringUtils.isNotBlank(pageInfo.getSortField())) {
            cursor.sort(new BasicDBObject(pageInfo.getSortField(), pageInfo.getSortDirection() == pageInfo.SORT_DIRECTION_DESC ? -1 : 1));
        }
        int count = cursor.count();
        try {
            while (cursor.hasNext()) {
                DBObject object = cursor.next();
                AppUserLogVo logListBean = new AppUserLogVo();
                logListBean.setOperateClassName(String.valueOf(object.get("operateClassName")));
                logListBean.setOperateDesc(String.valueOf(object.get("operateDesc")));
                logListBean.setPuppetId(String.valueOf(object.get("puppetId")));
                logListBean.setPuppetType(String.valueOf(object.get("puppetType")));
                logListBean.setOperateIp(String.valueOf(object.get("operateIp")));

                Date d = (Date) object.get("operateTime");
                logListBean.setOperateTime(d);

                logListBean.setOperateAccount(String.valueOf(object.get("operateAccount")));
                logListBean.setOperateId(Integer.parseInt(String.valueOf(object.get("operateId"))));
                logListBean.setOperateData(String.valueOf(object.get("operateData")));
                logListBean.setPuppetMobileNo(String.valueOf(object.get("puppetMobileNo")));
                if (object.get("device") == null) {
                    logListBean.setDevice("管理后台");
                } else {
                    logListBean.setDevice(String.valueOf(object.get("device")));
                }
                logVoList.add(logListBean);
            }
        } finally {
            cursor.close();
        }
        PageImpl<AppUserLogVo> page = new PageImpl<AppUserLogVo>();
        page.setResults(logVoList);
        page.setPageNumber(pageInfo.getPageNum());
        page.setPageSize(pageInfo.getPageSize());
        page.setTotalResults(count);
        return page;
    }

（4）使用GridFS的MongoDBFileDaoImpl:

普通文件系统优点是简单直接，缺点是当规模变大以后难于管理，难以扩展
使用GridFS的话优缺点正好对换，用起来相对复杂，但是当规模变大之后管理和扩展要容易得多

package com.eshore.framework.dao.mongodb;
import java.io.IOException;
import org.apache.commons.io.IOUtils;
import org.springframework.data.mongodb.core.MongoTemplate;
import com.mongodb.DB;
import com.mongodb.gridfs.GridFS;
import com.mongodb.gridfs.GridFSDBFile;
import com.mongodb.gridfs.GridFSInputFile;
public class MongoDBFileDaoImpl implements MongoDBFileDao {

    private MongoTemplate mongoTemplate;

    private static final String COLLECTION_NAME = "uploadFile";
    
    /**
     * @param filename
     *            文件名
     */
    public void removeByFilename(String filename) {
        this.removeByFilename(COLLECTION_NAME, filename);
    }

    /**
     * @param filename
     *            文件名
     */
    public void removeByFilename(String collectionName, String filename) {
        GridFS gridFS = getGridFS(collectionName);
        gridFS.remove(filename);
    }

    /**
     * @param filename
     *            文件名
     */
    @Override
    public MongoDBFile findByFilename(String filename) {
        return this.findByFilename(COLLECTION_NAME, filename);
    }

    /**
     * @param filename
     *            文件名
     * @param collectionName
     *            集合名
     */
    @Override
    public MongoDBFile findByFilename(String collectionName, String filename) {
        MongoDBFile mongoDBFile = null;
        GridFS gridFS = getGridFS(collectionName);
        GridFSDBFile gridFSDBFile = gridFS.findOne(filename);
        if (gridFSDBFile != null) {
            mongoDBFile = new MongoDBFile();
            mongoDBFile.set_id(gridFSDBFile.getId().toString());
            mongoDBFile.setContentType(gridFSDBFile.getContentType());
            mongoDBFile.setFilename(gridFSDBFile.getFilename());
            try {
                mongoDBFile.setBytes(IOUtils.toByteArray(gridFSDBFile
                    .getInputStream()));
            } catch (IOException e) {
                // TODO Auto-generated catch block
                //e.printStackTrace();
            }
            // mongoDBFile.setInputStream(gridFSDBFile.getInputStream());
        }
        return mongoDBFile;
    }

    /**
     * 存储文件 使用默认集合名
     * 
     * @throws IOException
     */
    @Override
    public void saveFile(MongoDBFile mongoDBFile) throws IOException {
        this.saveFile(COLLECTION_NAME, mongoDBFile);
    }

    /**
     * 存储文件
     * 
     * @param collectionName
     *            集合名 默认以IO流方式存入
     * @throws IOException
     */
    @Override
    public void saveFile(String collectionName, MongoDBFile mongoDBFile)
        throws IOException {
        GridFS gridFS = getGridFS(collectionName);
        GridFSInputFile gfs = null;
        if (mongoDBFile.getBytes() != null) {
            gfs = gridFS.createFile(mongoDBFile.getBytes());
        } else if (mongoDBFile.getInputStream() != null) {
            gfs = gridFS.createFile(mongoDBFile.getInputStream());
        } else {
            gfs = gridFS.createFile(mongoDBFile.getFile());
        }
        if (mongoDBFile.get_id() != null) {
            gfs.put("_id", mongoDBFile.get_id());
        }
        gfs.put("filename", mongoDBFile.getFilename());
        gfs.put("contentType", mongoDBFile.getContentType());
        gfs.save();
    }

    /**
     * 
     * @param collectionName
     *            集合名
     * @return
     */
    public GridFS getGridFS(String collectionName) {
        DB db = mongoTemplate.getDb();
        GridFS gridFS = new GridFS(db, collectionName);
        return gridFS;
    }

    public MongoTemplate getMongoTemplate() {
        return mongoTemplate;
    }

    public void setMongoTemplate(MongoTemplate mongoTemplate) {
        this.mongoTemplate = mongoTemplate;
    }

}

（5）MongoDBFileServiceImpl：

package com.eshore.framework.service.impl;

@Service("mongoDBFileService")
@Transactional(readOnly = true)
public class MongoDBFileServiceImpl implements MongoDBFileService {
    static Logger log = Logger.getLogger(MongoDBFileServiceImpl.class);

    @Autowired
    private MongoDBFileBuilder mongoDBFileBuilder;

    @Autowired
    private MongoDBFileDao mongoDBFileDao;

    @Override
    @Transactional(readOnly = false)
    public void removeByFilename(String filename) {
        mongoDBFileDao.removeByFilename(filename);
    }

    @Override
    public void removeByFilename(String collectionName, String filename) {
        // TODO Auto-generated method stub

    }

    @Override
    @Transactional(readOnly = false)
    public MongoDBFileVo findByFilename(String filename) {
        MongoDBFileVo mongoDBFileVo = null;
        try {
            MongoDBFile mongoDBFile = mongoDBFileDao.findByFilename(filename);
            mongoDBFileVo = mongoDBFileBuilder.buildValueObject(mongoDBFile);
        } catch (Exception e) {
            /*
             * // TODO Auto-generated catch block e.printStackTrace();
             */
        }
        return mongoDBFileVo;
    }

    @Override
    public MongoDBFileVo findByFilename(String collectionName, String filename) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    @Transactional(readOnly = false)
    public void saveFile(MongoDBFileVo mongoDBFileVo) throws IOException, BeanValidationException {

       // String startInfo = "调用mongoDBFileService.saveFile开始的时间" + new SimpleDateFormat("yyyyMMddhhmmssms.SSS").format(new Date(System.currentTimeMillis()));
        // log.error(startInfo);

        MongoDBFile mongoDBFile = mongoDBFileBuilder.buildEntity(mongoDBFileVo);
        mongoDBFileDao.saveFile(mongoDBFile);
    }

    @Override
    public void saveFile(String collectionName, MongoDBFileVo mongoDBFileVo) throws IOException, BeanValidationException {
        MongoDBFile mongoDBFile = mongoDBFileBuilder.buildEntity(mongoDBFileVo);
        mongoDBFileDao.saveFile(collectionName, mongoDBFile);

    }

    @Override
    @Transactional(readOnly = false)
    public void saveFile(List<MongoDBFileVo> mongoDBFileVos) throws IOException, BeanValidationException {
        Iterator<MongoDBFileVo> it = mongoDBFileVos.iterator();
        while (it.hasNext()) {
            MongoDBFileVo mongoDBFileVo = it.next();
            saveFile(mongoDBFileVo);
        }
    }
}
（5.5.1）ajax上传用户头像功能(页面代码)： 

<input type="hidden" id="imgUrl" name="imgUrl" value=""/>
<img class="normalFace" id="uploadimg" name="uploadimg" src="../images/fileUpload.png" onclick="fileSelect();"/>
<input id="appLogoFile" runat="server" name="appLogoFile" type="file" class="validate[required]" style="display:none;"  onchange="uploadInputChanged();"/>

//uploadInputChanged()如下：
function uploadInputChanged(){
	var myfileValue = $("#appLogoFile").val();
	if(!checkImageStyle("appLogoFile")){
		alert("仅支持JPG、JPEG、GIF、PNG格式的图片");
		return;
	}
	if(myfileValue&&myfileValue!=""){
		$.ajaxFileUpload({
	        url: basepath + '/appManager/uploadIcon.do?ajax=true',//用于文件上传的服务器端请求地址
	        type:'post',
	        secureuri:false,//一般设置为false
	        dataType: 'json',//返回值类型 一般设置为json
	        fileElementId:'appLogoFile',//文件上传空间的id属性  <input type="file" id="file" name="file" />
	        success: function (data, status)  //服务器成功响应处理函数
	        {
	        	if(data.fail){
	        		alert(data.fail);
	        	}else{
	        		$("#imgUrl").attr("value",data.imageurl);
	        		//生成预览
		        	<span style="color:#ff0000;">$("#uploadimg").attr("src",contextPath + "/uploadFile/loadImgDataByFileName.do?fileName="+data.imageurl</span>+"&time=" + Date.parse(new Date()));
	        	}
	        },
	        error: function (data, status, e)//服务器响应失败处理函数
	        {
	            alert(e);
	        }
		}
		
		); 
	}
}

//其中检测上传图片格式函数：
function checkImageStyle(divId){
	var uploadFile = document.getElementById(divId).value;
	var subfix = uploadFile.valueOf().toLowerCase();
	var reg=new RegExp(".jpg$|.jpeg$|gif$|png$");
	return reg.test(subfix);
}
（5.5.2）ajax上传用户头像功能(后台代码)：

先保存到mongo中，然后返回图片url到前台

@RequestMapping("/uploadIcon")
public void uploadIcon(HttpServletRequest request,
		HttpServletResponse response) {
	response.setCharacterEncoding("utf-8");
	response.setContentType("text/html");
	Date date = new Date();
	MultipartHttpServletRequest multipartRequest = null;
	MultipartFile multipartFile = null;
	try {
		multipartRequest = (MultipartHttpServletRequest) request;
		multipartFile = multipartRequest.getFile("appLogoFile");

		// File newFile = new File(indexbannerpath + "//" +newFilePath);
		// 如果文件大于400K返回错误信息
		if (multipartFile.getSize() > 400 * 1024) {
			JSONObject jsonO = new JSONObject();
			jsonO.put("fail", "头像文件太大了");
			response.getWriter().write(jsonO.toString());
		} else {
			// multipartFile.transferTo(newFile);
			AttachmentVo attachmentVo = new AttachmentVo();
			attachmentVo.setCreateTime(date);
			String extName = multipartFile.getOriginalFilename().substring(
					multipartFile.getOriginalFilename().lastIndexOf("."));
			attachmentVo.setExtName(extName);
			String fileNewName = UUID.randomUUID().toString() + "_"
					+ new SimpleDateFormat("yyyyMMddhhmmssms").format(date);
			attachmentVo.setFileName(fileNewName + extName);
			attachmentVo.setRelativePath(null);
			attachmentVo
					.setOldFileName(multipartFile.getOriginalFilename());
			attachmentVo.setOwnerType("appLogoFile");
			attachmentVo = attachmentService.add(attachmentVo);
			MongoDBFileVo mongoDBFileVo = new MongoDBFileVo();
			mongoDBFileVo.setContentType(attachmentVo.getExtName());
			mongoDBFileVo.setFilename(attachmentVo.getFileName());
			mongoDBFileVo.setBytes(multipartFile.getBytes());
			// mongoDBFileVo.setInputStream(inputStream);
			<span style="color:#ff0000;">mongoDBFileService</span>.saveFile(mongoDBFileVo);
			JSONObject jsonO = new JSONObject();
			jsonO.put(<span style="color:#ff0000;">"imageurl", attachmentVo.getFileName()</span>);
			<span style="color:#ff0000;">response.getWriter().write(jsonO.toString());</span>
		}
	} catch (Exception e) {
		e.printStackTrace();
	}
}
（5.5.3）ajax上传用户头像功能(页面根据url再调用后台方法生成图片)：

/**
 * 用户头像带缓存
 * 
 * @param fileName
 * @param request
 * @param response
 * @throws IOException
 */
@RequestMapping("/loadImgDataByFileName")
public void loadImgDataByFileName(@RequestParam("fileName") String fileName, HttpServletRequest request, HttpServletResponse response) throws IOException {
	if(fileName==null) {
		return;
	}
    AttachmentVo attachmentVo = attachmentService.getByFileName(fileName);
    MongoDBFileVo  mongoDBFileVo=null;    
    if(attachmentVo!=null && attachmentVo.getFileName()!=null ){
        mongoDBFileVo = mongoDBFileService.findByFilename(attachmentVo.getFileName());
    }else{
        return;
    }
     
    response.setContentType(attachmentVo.getExtName());
    response.setHeader("Cache-Control", "public"); // HTTP/1.1
    response.setHeader("Pragma", "Pragma");
    response.setDateHeader("Expires", System.currentTimeMillis() + 30000000);
    byte[] buffer = mongoDBFileVo.getBytes();
    OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
    toClient.write(buffer);
    toClient.flush();
    toClient.close();
}



版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。
mongodb-jdbc mongodb-jdbc mongodb java jdbc驱动 =============== public static void main（String args []）抛出SQLException，ClassNotFoundException {jdbcdriver =“ org.opencloudb.jdbc.mongodb.MongoDriver”; jdbcurl =“ mongodb：//192.168.0.99/test”; 字符串username =“ jifeng”; 字符串password =“ jifeng”; Class.forName（jdbcdriver）; 连接c = DriverManager.getConnection（jdbcurl，username，password）; 语句st = c.createStatement（）; prin 立即下载

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