public class UserDaoImpl extends JdbcDaoSupport implements UserDao {@Overridepublic void save(User u) {String sql = "insert into user values('1',?) ";super.getJdbcTemplate().update(sql, u.getName());}@Overridepublic void delete(Integer id) {String sql = "delete from user where id = ? ";super.getJdbcTemplate().update(sql,id);}@Overridepublic void update(User u) {String sql = "update  user set name = ? where id=? ";super.getJdbcTemplate().update(sql, u.getName(),u.getId());}@Overridepublic User getById(Integer id) {String sql = "select * from user where id = ? ";return super.getJdbcTemplate().queryForObject(sql,new RowMapper<User>(){@Overridepublic User mapRow(ResultSet rs, int arg1) throws SQLException {User u = new User();u.setId(rs.getInt("id"));u.setName(rs.getString("name"));return u;}}, id);}@Overridepublic int getTotalCount() {String sql = "select count(*) from user  ";Integer count = super.getJdbcTemplate().queryForObject(sql, Integer.class);return count;}@Overridepublic List<User> getAll() {String sql = "select * from user  ";List<User> list = super.getJdbcTemplate().query(sql, new RowMapper<User>(){@Overridepublic User mapRow(ResultSet rs, int arg1) throws SQLException {User u = new User();u.setId(rs.getInt("id"));u.setName(rs.getString("name"));return u;}});return list;}
}

jdbc.jdbcUrl=jdbc:mysql:///spring
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.user=root
jdbc.password=1234

<!-- 指定spring读取db.properties配置 -->
<context:property-placeholder location="classpath:db.properties"  />
<!-- 将连接池放入spring容器 -->
<bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" ><property name="jdbcUrl" value="${jdbc.jdbcUrl}" ></property><property name="driverClass" value="${jdbc.driverClass}" ></property><property name="user" value="${jdbc.user}" ></property><property name="password" value="${jdbc.password}" ></property>
</bean>
<!-- 将UserDao放入spring容器 -->
<bean name="userDao" class="com.jichi.jdbctemplate.UserDaoImpl" ><property name="dataSource" ref="dataSource" ></property>
</bean>

/** Copyright 2002-2012 the original author or authors.** Licensed under the Apache License, Version 2.0 (the "License");* you may not use this file except in compliance with the License.* You may obtain a copy of the License at**      http://www.apache.org/licenses/LICENSE-2.0** Unless required by applicable law or agreed to in writing, software* distributed under the License is distributed on an "AS IS" BASIS,* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.* See the License for the specific language governing permissions and* limitations under the License.*/package org.springframework.jdbc.core.support;import java.sql.Connection;
import javax.sql.DataSource;import org.springframework.dao.support.DaoSupport;
import org.springframework.jdbc.CannotGetJdbcConnectionException;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.jdbc.datasource.DataSourceUtils;
import org.springframework.jdbc.support.SQLExceptionTranslator;/*** Convenient super class for JDBC-based data access objects.** <p>Requires a {@link javax.sql.DataSource} to be set, providing a* {@link org.springframework.jdbc.core.JdbcTemplate} based on it to* subclasses through the {@link #getJdbcTemplate()} method.** <p>This base class is mainly intended for JdbcTemplate usage but can* also be used when working with a Connection directly or when using* {@code org.springframework.jdbc.object} operation objects.** @author Juergen Hoeller* @since 28.07.2003* @see #setDataSource* @see #getJdbcTemplate* @see org.springframework.jdbc.core.JdbcTemplate*/
public abstract class JdbcDaoSupport extends DaoSupport {private JdbcTemplate jdbcTemplate;/*** Set the JDBC DataSource to be used by this DAO.*/public final void setDataSource(DataSource dataSource) {if (this.jdbcTemplate == null || dataSource != this.jdbcTemplate.getDataSource()) {this.jdbcTemplate = createJdbcTemplate(dataSource);initTemplateConfig();}}/*** Create a JdbcTemplate for the given DataSource.* Only invoked if populating the DAO with a DataSource reference!* <p>Can be overridden in subclasses to provide a JdbcTemplate instance* with different configuration, or a custom JdbcTemplate subclass.* @param dataSource the JDBC DataSource to create a JdbcTemplate for* @return the new JdbcTemplate instance* @see #setDataSource*/protected JdbcTemplate createJdbcTemplate(DataSource dataSource) {return new JdbcTemplate(dataSource);}/*** Return the JDBC DataSource used by this DAO.*/public final DataSource getDataSource() {return (this.jdbcTemplate != null ? this.jdbcTemplate.getDataSource() : null);}/*** Set the JdbcTemplate for this DAO explicitly,* as an alternative to specifying a DataSource.*/public final void setJdbcTemplate(JdbcTemplate jdbcTemplate) {this.jdbcTemplate = jdbcTemplate;initTemplateConfig();}/*** Return the JdbcTemplate for this DAO,* pre-initialized with the DataSource or set explicitly.*/public final JdbcTemplate getJdbcTemplate() {return this.jdbcTemplate;}/*** Initialize the template-based configuration of this DAO.* Called after a new JdbcTemplate has been set, either directly* or through a DataSource.* <p>This implementation is empty. Subclasses may override this* to configure further objects based on the JdbcTemplate.* @see #getJdbcTemplate()*/protected void initTemplateConfig() {}@Overrideprotected void checkDaoConfig() {if (this.jdbcTemplate == null) {throw new IllegalArgumentException("'dataSource' or 'jdbcTemplate' is required");}}/*** Return the SQLExceptionTranslator of this DAO's JdbcTemplate,* for translating SQLExceptions in custom JDBC access code.* @see org.springframework.jdbc.core.JdbcTemplate#getExceptionTranslator()*/protected final SQLExceptionTranslator getExceptionTranslator() {return getJdbcTemplate().getExceptionTranslator();}/*** Get a JDBC Connection, either from the current transaction or a new one.* @return the JDBC Connection* @throws CannotGetJdbcConnectionException if the attempt to get a Connection failed* @see org.springframework.jdbc.datasource.DataSourceUtils#getConnection(javax.sql.DataSource)*/protected final Connection getConnection() throws CannotGetJdbcConnectionException {return DataSourceUtils.getConnection(getDataSource());}/*** Close the given JDBC Connection, created via this DAO's DataSource,* if it isn't bound to the thread.* @param con Connection to close* @see org.springframework.jdbc.datasource.DataSourceUtils#releaseConnection*/protected final void releaseConnection(Connection con) {DataSourceUtils.releaseConnection(con, getDataSource());}}

    @Testpublic void fun2() throws Exception{User u = new User();u.setName("tom");ud.save(u);}

<!-- 指定spring读取db.properties配置 -->
<context:property-placeholder location="classpath:db.properties"  />
<!-- 1.将连接池放入spring容器 -->
<bean name="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" ><property name="jdbcUrl" value="${jdbc.jdbcUrl}" ></property><property name="driverClass" value="${jdbc.driverClass}" ></property><property name="user" value="${jdbc.user}" ></property><property name="password" value="${jdbc.password}" ></property>
</bean>
<!-- 2.将JDBCTemplate放入spring容器 -->
<bean name="jdbcTemplate" class="org.springframework.jdbc.core.JdbcTemplate" ><property name="dataSource" ref="dataSource" ></property>
</bean>
<!-- 3.将UserDao放入spring容器 -->
<bean name="userDao" class="com.jichi.jdbctemplate.UserDaoImpl" ><property name="jdbcTemplate" ref="jdbcTemplate" ></property>
</bean>

public class UserDaoImpl  implements UserDao {@Resourceprivate JdbcTemplate jdbcTemplate;@Overridepublic void save(User u) {String sql = "insert into user values('1',?) ";jdbcTemplate.update(sql, u.getName());}@Overridepublic void delete(Integer id) {String sql = "delete from user where id = ? ";jdbcTemplate.update(sql,id);}@Overridepublic void update(User u) {String sql = "update  user set name = ? where id=? ";jdbcTemplate.update(sql, u.getName(),u.getId());}@Overridepublic User getById(Integer id) {String sql = "select * from user where id = ? ";return jdbcTemplate.queryForObject(sql,new RowMapper<User>(){@Overridepublic User mapRow(ResultSet rs, int arg1) throws SQLException {User u = new User();u.setId(rs.getInt("id"));u.setName(rs.getString("name"));return u;}}, id);}@Overridepublic int getTotalCount() {String sql = "select count(*) from user  ";Integer count = jdbcTemplate.queryForObject(sql, Integer.class);return count;}@Overridepublic List<User> getAll() {String sql = "select * from user  ";List<User> list = jdbcTemplate.query(sql, new RowMapper<User>(){@Overridepublic User mapRow(ResultSet rs, int arg1) throws SQLException {User u = new User();u.setId(rs.getInt("id"));u.setName(rs.getString("name"));return u;}});return list;}
}

    @Testpublic void fun2() throws Exception{User u = new User();u.setName("tom");ud.save(u);}

    @Overridepublic void save(User u) {String sql = "insert into user values('1',?) ";jdbcTemplate.update(sql, u.getName());}@Overridepublic void delete(Integer id) {String sql = "delete from user where id = ? ";jdbcTemplate.update(sql,id);}@Overridepublic void update(User u) {String sql = "update  user set name = ? where id=? ";jdbcTemplate.update(sql, u.getName(),u.getId());}

    @Overridepublic int getTotalCount() {String sql = "select count(*) from user  ";Integer count = jdbcTemplate.queryForObject(sql, Integer.class);return count;}

    @Overridepublic User getById(Integer id) {String sql = "select * from user where id = ? ";return jdbcTemplate.queryForObject(sql,new RowMapper<User>(){@Overridepublic User mapRow(ResultSet rs, int arg1) throws SQLException {User u = new User();u.setId(rs.getInt("id"));u.setName(rs.getString("name"));return u;}}, id);}

    @Overridepublic List<User> getAll() {String sql = "select * from user  ";List<User> list = jdbcTemplate.query(sql, new RowMapper<User>(){@Overridepublic User mapRow(ResultSet rs, int arg1) throws SQLException {User u = new User();u.setId(rs.getInt("id"));u.setName(rs.getString("name"));return u;}});return list;}

    @Overridepublic List<User> getAll() {String sql = "select * from user  ";List<User> list = jdbcTemplate.query(sql,new BeanPropertyRowMapper<>(User.class));return list;}