1.运用spring集成mongodb是，刚开始最大的困难不是怎么操作，而是有关导入jar文件的问题。我在做一个小例子的时候，一直有一个错误就是NoSuchMethod。网上查了好多资料说是spring-data-mongodb与spring-data-commons包版本不一致的问题，下载了一个晚上的不同版本jar文件。后来才发现原来是spring-framework版本太低，于是果断换了3.2.1版本就好了。提醒各位排查错误的时候有时我们需要换个角度来。

2.spring配置mongodb

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:p="http://www.springframework.org/schema/p" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mongo="http://www.springframework.org/schema/data/mongo"
	xsi:schemaLocation="http://www.springframework.org/schema/context
          http://www.springframework.org/schema/context/spring-context-3.0.xsd
          http://www.springframework.org/schema/data/mongo
          http://www.springframework.org/schema/data/mongo/spring-mongo-1.2.xsd
          http://www.springframework.org/schema/beans
          http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">

    
	<context:property-placeholder location="classpath:mongo.properties" />
	<context:component-scan base-package="com.mongo.dao" />
	<context:component-scan base-package="com.mongo.service" />

	<!-- Default bean name is 'mongo' -->
	<mongo:mongo host="localhost" port="27017">
		<mongo:options connections-per-host="8"
			threads-allowed-to-block-for-connection-multiplier="4"
			connect-timeout="1000" max-wait-time="1500" auto-connect-retry="true"
			socket-keep-alive="true" socket-timeout="1500" slave-ok="true"
			write-number="1" write-timeout="0" write-fsync="true" />
	</mongo:mongo>

	<!-- 注册MongoDbFactory类 -->
	<mongo:db-factory id="mongoDbFactory" host="localhost"
		port="27017" dbname="bylw" username="xiaozhi" password="123" />


	<!-- 注册MongoTemplate类 -->
	<bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
		<constructor-arg ref="mongoDbFactory" />
		<!-- <constructor-arg name="databaseName" value="xiaozhi" /> -->
	</bean>

</beans>

?domain类：Student

package com.mongo.domain;

import org.springframework.data.annotation.Id;
import org.springframework.data.annotation.PersistenceConstructor;
import org.springframework.data.mongodb.core.mapping.Document;

/*
 * 学生信息集合类
 */
@Document
public class Student {
	@Id
	private String sno; // 学号

	private String sname; // 姓名

	private String ssex; // 性别

	private int sage; // 年龄

	private String sdept; // 学院

	private String smajor; // 专业

	private String s_entrance; // 入学时间

	private String s_class; // 班级

	private String subject_id = "";// 选择的题目
             
             get{} set{}...
}

?Dao类

package com.mongo.dao;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.stereotype.Repository;

import com.mongo.domain.Student;

@Repository
public class GraduateProjectDao {
	@Autowired
	private MongoTemplate mongoTemplate;
	
	//添加学生
	public void addStudent(Student student){
		mongoTemplate.insert(student);
	}
}

?

测试：

package com.mongo.test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.data.mongodb.core.MongoTemplate;

import com.mongo.dao.GraduateProjectDao;
import com.mongo.domain.Student;

public class TestMain {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
		System.out.println(ctx.getBean("mongoTemplate",MongoTemplate.class));
		St