搭建Spring MVC环境进行简单的增、删、改、查。

Spring MVC流程说明：
用户向Web服务器发送请求
Web服务器根据web.xml文件找到请求映射到的Contorller处理器。
处理器根据请求访问业务Service层和DAO层进行处理然后把得出的返回结果到前端JSP页面
用户通过返回结果得到相应的信息

项目配置文件如下：
Web.xml:

<web-app xmlns:xsi=“http://www.w3.org/2001/XMLSchema-instance”

xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
id="WebApp_ID" version="2.5">
<!-- 配置 Spring的 IOC 容器: 配置文件、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>
<!-- 配置 SpringMVC 的 Servlet -->
<servlet>
    <servlet-name>hello</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
        <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext-mvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
    <servlet-name>hello</servlet-name>
    <url-pattern>*.action</url-pattern>
</servlet-mapping>
<filter>
    <filter-name>encodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filte-class>
</filter>
<filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>
<welcome-file-list>
  <welcome-file>index.jsp</welcome-file>
</welcome-file-list>

db.properties：
user=root
password=1204
driver=com.mysql.jdbc.Driver
url=jdbc:mysql:///test
SpringMVC配置文件:

<beans xmlns=“http://www.springframework.org/schema/beans”

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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.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">
<context:component-scan base-package="springmvc"></context:component-scan>
<!-- 配置视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="suffix" value=".jsp"></property>
    <property name="prefix" value="/"></property>
</bean>

Spring 配置文件：

<beans xmlns=“http://www.springframework.org/schema/beans”

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.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/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.1.xsd
    http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd">
<context:component-scan base-package="springmvc"></context:component-scan>
<context:property-placeholder location="classpath:db.properties"/>
<!-- 配置 C3P0 数据源 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <property name="user" value="${user}"></property>
    <property name="password" value="${password}"></property>
    <property name="jdbcUrl" value="${url}"></property>
    <property name="driverClass" value="${driver}"></property>
    <!-- 当连接池中的连接用完时，C3P0一次性创建新连接的数目-->
    <property name="acquireIncrement" value="5"></property>
    <!-- 初始化时创建的连接数，必须在minPoolSize和maxPoolSize之间 -->
    <property name="initialPoolSize" value="10"></property>
    <property name="maxPoolSize" value="20"></property>
    <property name="minPoolSize" value="5"></property>
 <!-- jdbc的标准参数  用以控制数据源内加载的PreparedStatement数量，但由于预缓存的Statement属于单个Connection而不是整个连接 -->
    <property name="maxStatements" value="20"></property>
</bean>
<bean id="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate">
    <property name="dataSource" ref="dataSource"/>
</bean>
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
    <property name="dataSource" ref="dataSource"></property>
</bean>

源码：
Customer：
package springmvc.model;
public class Customer {

private Integer id;
private String name;
private String address;
private String phone;
public Customer(Integer id, String name, String address, String phone) {
    this.id = id;
    this.name = name;
    this.address = address;
    this.phone = phone;
}
public Customer() {
    // TODO Auto-generated constructor stub
}
public Integer getId() {
    return id;
}
public void setId(Integer id) {
    this.id = id;
}
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public String getAddress() {
    return address;
}
public void setAddress(String address) {
    this.address = address;
}
public String getPhone() {
    return phone;
}
public void setPhone(String phone) {
    this.phone = phone;
}
@Override
public String toString() {
    return "Customer [id=" + id + ", name=" + name + ", address=" + address     + ", phone=" + phone + "]";
}

}
CriteriaCustomer：
package springmvc.model;
public class CriteriaCustomer {

private String name = "";
private String address = "";
private String phone = "";
public String getName() {
    return name;
}
public void setName(String name) {
    this.name = name;
}
public String getAddress() {
    return address;
}
public void setAddress(String address) {
    this.address = address;
}
public String getPhone() {
    return phone;
}
public void setPhone(String phone) {
    this.phone = phone;
}
public CriteriaCustomer(String name, String address, String phone) {
    this.name = name;
    this.address = address;
    this.phone = phone;
    if(this.name == null){
        this.name = "";
    }
    if(this.address == null){
        this.address = "";
    }
    if(this.phone == null){
        this.phone = "";
    }
}
public CriteriaCustomer() {
    // TODO Auto-generated constructor stub
}
@Override
public String toString() {
    return "CriteriaCustomer [name=" + name + ", address=" + address
            + ", phone=" + phone + "]";
}   

}
DAO:
package springmvc.dao;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;
import javax.annotation.Resource;
import org.springframework.jdbc.core.BeanPropertyRowMapper;
import org.springframework.jdbc.core.JdbcTemplate;
public class DAO {

private JdbcTemplate jdbcTemplate;
@Resource
public void setJdbcTemplate(JdbcTemplate jdbcTemplate) {
    this.jdbcTemplate = jdbcTemplate;
}
private Class<T> clazz;
@SuppressWarnings("unchecked")
public DAO() {
    Type type = getClass().getGenericSuperclass();
    if(type instanceof ParameterizedType){
        ParameterizedType pt = (ParameterizedType) type;
        Type [] parameterArgs = pt.getActualTypeArguments();
        if(parameterArgs != null && parameterArgs.length > 0){
            if(parameterArgs[0] instanceof Class){
                clazz = (Class<T>) parameterArgs[0]; 
            }
        }
    }
}
protected void update(String sql, Object ... args) throws SQLException{
    jdbcTemplate.update(sql, args);
}
protected T get(String sql, Object ... args) throws SQLException{
    return jdbcTemplate.queryForObject(sql, new BeanPropertyRowMapper<T>(clazz), args);
}
protected List<T> getForList(String sql, Object ... args) throws SQLException{
    return jdbcTemplate.query(sql, new BeanPropertyRowMapper(clazz), args);
}
protected <E> E getValue(String sql, Object ... args) throws SQLException{
    E result = null;
    List list = jdbcTemplate.queryForList(sql, args);
    if(list != null && list.size() > 0){
        Map map = (Map) list.get(0);
        result = (E) map.values().iterator().next();
    }
    return result;
}

}
CustomerDAO:
package springmvc.dao;
import java.util.List;
import springmvc.model.CriteriaCustomer;
import springmvc.model.Customer;
public interface CustomerDAO{

public void save(Customer cust);
public void delete(Integer id);
public void update(Customer cust);
public List<Customer> getForList(CriteriaCustomer cc);
public Customer getCustomer(Integer id);
public long getCountWithName(String name);

}
CustomerDAOImpl:
package springmvc.dao.impl;
import java.sql.SQLException;
import java.util.List;
import org.springframework.stereotype.Repository;
import springmvc.dao.CustomerDAO;
import springmvc.dao.DAO;
import springmvc.exception.CustomerNameExistException;
import springmvc.exception.DBException;
import springmvc.model.CriteriaCustomer;
import springmvc.model.Customer;
@Repository(“customerDAO”)
public class CustomerDAOImpl extends DAO implements CustomerDAO {

@Override
public void save(Customer cust) {
    String sql = "INSERT INTO customers(name, address, phone) VALUES(?, ?, ?)";
    try {
        update(sql, cust.getName(), cust.getAddress(), cust.getPhone());
    } catch(SQLException ex){
        ex.printStackTrace();
        throw new CustomerNameExistException("名字重复了!...");
    }
}
@Override
public void delete(Integer id) {
    String sql = "DELETE FROM customers WHERE id = ?";
    try {
        update( sql, id);
    } catch(SQLException ex){
        ex.printStackTrace();
        throw new DBException();
    }
}
@Override
public void update(Customer cust) {
    String sql = "UPDATE customers SET name = ?, address = ?, phone = ? WHERE id = ?";
    try {
        update(sql, cust.getName(), cust.getAddress(), cust.getPhone(), cust.getId());
    } catch(SQLException ex){
        ex.printStackTrace();
        throw new DBException();
    }
}
@Override
public List<Customer> getForList(CriteriaCustomer cc) {     
    String sql = "SELECT id, name, address, phone FROM customers " +
            "WHERE name LIKE ? AND address LIKE ? AND phone LIKE ?";
    try {
        return getForList(sql, "%" + cc.getName() + "%", 
                "%" + cc.getAddress() + "%", "%" + cc.getPhone() + "%");
    } catch(SQLException ex){
        ex.printStackTrace();
        throw new DBException();
    }   
}
@Override
public Customer getCustomer(Integer id) {
    String sql = "SELECT id, name, address, phone FROM customers WHERE id = ?";
    try {
        return get(sql, id);
    } catch(SQLException ex){
        ex.printStackTrace();
        throw new DBException();
    }   
}
@Override
public long getCountWithName(String name) {
    String sql = "SELECT count(id) FROM customers WHERE name = ?";
    try {
        return getValue(sql, name);
    } catch(SQLException ex){
        ex.printStackTrace();
        throw new DBException();
    }   
}

}
CustomerController:
package springmvc.controller;
import java.util.Map;
import javax.annotation.Resource;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import springmvc.dao.CustomerDAO;
import springmvc.model.CriteriaCustomer;
import springmvc.model.Customer;
@Controller(“customer”)
public class CustomerController {

@Resource
private CustomerDAO customerDAO;
@ModelAttribute("customer")
public Customer getCustomer(){
    return new Customer();
}
@RequestMapping("/delete")
public String delete(@RequestParam("id") Integer id){
    customerDAO.delete(id);
    return "redirect:query.action";
}
@RequestMapping("/query")
public String query(CriteriaCustomer cc, Map<String, Object> map){
    map.put("customers", customerDAO.getForList(cc)); 
    return "index";
}
@RequestMapping("/toAddCustomer")
public String addCustomer(){
    return "addCustomer";
}
@RequestMapping("/saveCustomer")
public String saveCustomer(Customer customer){
    customerDAO.save(customer);
    return "redirect:query.action";
}
@RequestMapping("/getCustomer")
public String getCustomerForUpdate(@RequestParam("id") Integer id, Map<String, Object> map){
    map.put("customer", customerDAO.getCustomer(id)); 
    return "updateCustomer";
}
@RequestMapping("/update")
public String updateCustomer(Customer customer){
    customerDAO.update(customer);
    return "redirect:query.action";
}

}
CustomerDAOTest:
package springmvc.test;
import java.sql.SQLException;
import java.util.List;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import springmvc.dao.CustomerDAO;
import springmvc.model.CriteriaCustomer;
import springmvc.model.Customer;
public class CustomerDAOTest {

private CustomerDAO customerDAO = null;
public CustomerDAOTest(){
    ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");
    customerDAO = (CustomerDAO) ctx.getBean("customerDAO");
}
@Test
public void testSave() throws SQLException {
    Customer cust = new Customer(null, "XiaoJing", "DaLian", "13920098833");
    customerDAO.save(cust);
}
@Test
public void testDelete() throws SQLException {
    customerDAO.delete(2);
}
@Test
public void testUpdateCustomer() throws SQLException {
    Customer cust = new Customer(3, "XiaoJing3", "DaLian", "13920098833");
    customerDAO.update(cust);
}
@Test
public void testGetForListCriteriaCustomer() throws SQLException {
    CriteriaCustomer cc = new CriteriaCustomer();
    List<Customer> customers = customerDAO.getForList(cc);
    System.out.println(customers); 
}
@Test
public void testGetCustomer() throws SQLException {
    Customer cust = customerDAO.getCustomer(3);
    System.out.println(cust);
}
@Test
public void testGetCountWithName(){
    long count = customerDAO.getCountWithName("XiaoJing3");
    System.out.println(count); 
}

}
前台展示的Jsp页面如下：
Index.jsp：
%@page import="java.util.List"%
<%@ page language=“java” contentType=“text/html; charset=UTF-8”

pageEncoding="UTF-8"%>

%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %





Insert title here

    <form action="query.action" method="POST">

    <table>

        <tr>
            <td>Name: </td>  
            <td>
                <input type="text" name="name" />
            </td>
        </tr>

        <tr> 
            <td>Address: </td>
            <td>
                <input type="text" name="address" />
            </td>
        </tr>

        <tr>
            <td>Phone: </td>
            <td>
                <input type="text" name="phone"/>
            </td>
        </tr>

        <tr>
            <td><input type="submit" value="查询全部"/></td>
            <td><a href="${baseUrl}/toAddCustomer.action">Create New Customer</a></td>
        </tr>

    </table>

</form>

<br><br>

<c:if test="${!empty requestScope.customers }">

    <table border="1" cellpadding="10" cellspacing="0">

        <tr>
            <td>Name:</td>
            <td>Address:</td>
            <td>Phone:</td>
            <td>Update</td>
            <td>Delete</td>
        </tr>

        <c:forEach items="${requestScope.customers }" var="cust">

            <tr>
                <td>${cust.name }</td>
                <td>${cust.address }</td>
                <td>${cust.phone }</td>
                <td><a href="${baseUrl}/getCustomer.action?id=${cust.id}">UPDATE</a></td>
                <td><a href="${baseUrl}/delete.action?id=${cust.id}">DELETE</a></td>
            </tr>

        </c:forEach>    

    </table>
</c:if>

<!--  
    已经执行查询, 但返回的集合中没有任何元素时, 显示: 没有符合条件的员工信息. 
-->
<c:if test="${requestScope.customers != null }">
    <c:if test="${empty requestScope.customers }">
        没有符合条件的员工信息. 
    </c:if>
</c:if>

addCustomer.jsp：
<%@ page language=“java” contentType=“text/html; charset=UTF-8”

pageEncoding="UTF-8"%>

%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %

Insert title here

<br><br>

<form:form action="saveCustomer.action" method="post" 
    modelAttribute="customer">

    <table>

        <tr>
            <td>Name: </td>  
            <td>
                <form:input path="name"/>
            </td>
        </tr>

        <tr>
            <td>Address: </td>
            <td>
                <form:input path="address"/>
            </td>
        </tr>

        <tr>
            <td>Phone: </td>
            <td>
                <form:input path="phone"/>
            </td>
        </tr>

        <tr>
            <td colspan="2">  
                <input type="submit" value="Submit"/>
            </td>
        </tr>

    </table>

</form:form>

updateCustomer.jsp：
%@page import="java.util.List"%
<%@ page language=“java” contentType=“text/html; charset=UTF-8”

pageEncoding="UTF-8"%>

%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %
%@ taglib prefix="form" uri="http://www.springframework.org/tags/form" %

Insert title here

    <c:set value="${requestScope.customer}" var="cust"></c:set>

<form:form action="update.action" method="POST" modelAttribute="customer">
    <input type="hidden" name="id" value="${cust.id}">
    Name: <input type="text" name="name" value="${cust.name }" /><br>
    Address: <input type="text" name="address" value="${cust.address }"/><br>
    Phone:<input type="text" name="phone" value="${cust.phone }"/><br>
    <input type="submit" value="Update"/>
</form:form>

数据库表结构：
Create Table

CREATE TABLE customers (
ID int(11) NOT NULL AUTO_INCREMENT,
Name varchar(255) DEFAULT NULL,
ADDRESS varchar(255) DEFAULT NULL,
PHONE varchar(255) DEFAULT NULL,
PRIMARY KEY (ID)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=gb2312