spring mvc 环境搭建

web.xml 

<web-app 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" version="3.0">

<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>

<context-param>
<param-name>log4jRefreshInterval</param-name>
<param-value>3000</param-value>
</context-param>

<listener>
<listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>

<context-param>
<param-name>webAppRootKey</param-name>
<param-value>webapp.root</param-value>
</context-param>

<!-- spring core 配置 -->
<servlet>
<servlet-name>spring</servlet-name>
<!-- 该拦截器默认加载servlet.xml 格式的 -->
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- load-on-startup：表示启动容器时初始化该Servlet -->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:main-servlet.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>

<!-- 所有的请求交由spring进行拦截 -->
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/api/*</url-pattern>
</servlet-mapping>

</web-app>
main-servlet.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-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-4.0.xsd">
<!-- 扫描com.eazy下面的所有注解 -->
<context:component-scan base-package="com.eazy" />

<mvc:annotation-driven />

<!-- 引入配置文件 -->
<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="classpath:db.properties" />
</bean>

<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
destroy-method="close">
<property name="driverClassName" value="${db.driver}" />
<property name="url" value="${db.url}" />
<property name="username" value="${db.username}" />
<property name="password" value="${db.password}" />
<!-- 初始化连接大小 -->
<property name="initialSize" value="${initialSize}"></property>
<!-- 连接池最大数量 -->
<property name="maxActive" value="${maxActive}"></property>
<!-- 连接池最大空闲 -->
<property name="maxIdle" value="${maxIdle}"></property>
<!-- 连接池最小空闲 -->
<property name="minIdle" value="${minIdle}"></property>
<!-- 获取连接最大等待时间 -->
<property name="maxWait" value="${maxWait}"></property>
</bean>

<!-- 定义事务管理 -->
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager"
p:dataSource-ref="dataSource" />

<!-- 配置Jdbc模板 -->
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
<property name="dataSource" ref="dataSource" />
</bean>

<!-- 文件上传 -->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="defaultEncoding" value="utf-8"></property>
<property name="maxUploadSize" value="10485760000"></property>
<property name="maxInMemorySize" value="40960"></property>
</bean>

<!-- 转换返回json格式配置 -->
<bean
class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<ref bean="mappingJacksonHttpMessageConverter" />
</list>
</property>
</bean>

<bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />
</beans>
db.properties

db.driver=com.mysql.jdbc.Driver
db.url=jdbc:mysql://127.0.0.1:3306/test
db.username=accp
db.password=
#\u5B9A\u4E49\u521D\u59CB\u8FDE\u63A5\u6570
initialSize=0
#\u5B9A\u4E49\u6700\u5927\u8FDE\u63A5\u6570
maxActive=20
#\u5B9A\u4E49\u6700\u5927\u7A7A\u95F2
maxIdle=20
#\u5B9A\u4E49\u6700\u5C0F\u7A7A\u95F2
minIdle=1
#\u5B9A\u4E49\u6700\u957F\u7B49\u5F85\u65F6\u95F4
maxWait=60000
log4j

log4j.rootLogger=DEBUG, CONSOLE,FILE
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
log4j.appender.CONSOLE.layout.ConversionPattern=%-d{yyyy-MM-dd HH:mm:ss,SSS} [%c]-[%p] %m%n

log4j.appender.FILE=org.apache.log4j.RollingFileAppender
log4j.appender.FILE.File=E://log/login_server.log
log4j.appender.FILE.MaxFileSize=4000KB
log4j.appender.FILE.MaxBackupIndex=10
log4j.appender.FILE.layout=org.apache.log4j.PatternLayout
log4j.appender.FILE.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss,SSS} [%c]-[%p] %m%n

log4j.logger.org.apache.commons.httpclient.HttpClient=ERROR
log4j.logger.org.apache.commons.httpclient.params.DefaultHttpParams=ERROR
log4j.logger.org.apache.commons.httpclient.methods.EntityEnclosingMethod=ERROR
log4j.logger.org.apache.commons.httpclient.HttpMethodBase=ERROR
log4j.logger.org.apache.commons.httpclient.HttpConnection=ERROR
log4j.logger.httpclient.wire.content=ERROR
log4j.logger.httpclient.wire.header=ERROR
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dao层代码

package com.eazy.dao;

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

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;

// 标注为Dao层 默认当前类名
@Repository
public class UserDao {

@Autowired
private JdbcTemplate jdbcTemplate;

// 查询用户列表
public List<Map<String,Object>> selectUser() {
return jdbcTemplate.queryForList("select * from user");
}
}

service 层代码

package com.eazy.service;

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

public interface UserService {

public List<Map<String,Object>> selectUser();
}

service impl

package com.eazy.service.impl;

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

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.eazy.dao.UserDao;
import com.eazy.service.UserService;

// 服务标注，推荐使用
@Service
public class UserServiceImpl implements UserService {

@Autowired
private UserDao userDao;

public List<Map<String, Object>> selectUser() {
return userDao.selectUser();
}

}

controller

package com.eazy.controller;

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

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.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import com.eazy.service.UserService;

@Controller
@RequestMapping("/user")
public class UserController {

// controller 提供spring restful 功能，把返回数据提供给手机端，适合用于api 提供

@Autowired
private UserService userService;

@RequestMapping(value = "list" , method = RequestMethod.GET)
@ResponseBody
public Map<String,Object> selectUser() {
Map<String,Object> map = new HashMap<String,Object>();
map.put("result", userService.selectUser());
return map;
}
}