1、按照javaweb項目的要求逐步建立搭建起機構，具體的類包有：model 、db、dao、test;
具體的架構詳見下圖：
2、根據搭建的項目架構新建數據庫test和數據庫表t_userinfo並且添加對應的測試數據; (這裡我使用的是綠色版的數據庫，具體的下載地址：http://pan.baidu.com/s/1mg88YAc)
具體的建立數據庫操作詳見下圖：
3、編寫包中的各種類代碼，具體參考代碼如下：
UserInfo.java
/** * FileName: UserInfo.java * @Description: TODO封裝對象的信息* Copyright: personage * Company personage * @author: gaoxing * @version V1.0 * Createdate: 2014-5-25 下午2:26:41 * * Modification History: * Date Author Version Discription * ----------------------------------------------------------------------------------- * 2014-5-25 GX 1.0 1.0 * Why & What is modified: <修改原因描述> */package com.org.user.model; /** * @ClassName: UserInfo * @Description:TODO封裝對象的信息* @author: gaoxing * @date: 2014-5-25 下午2:26:41 */public class UserInfo { private int userid; private String username; private String password; /** * @Title: UserInfo * @Description: TODO(描述這個方法的作用) * @param: @param userid * @param: @param username * @param: @param password * @throws */ public UserInfo(int userid, String username, String password) { super(); this.userid = userid; this.username = username; this.password = password; } /** * @Title: UserInfo * @Description: TODO無參的構造方法* @param: * @throws */public UserInfo() { super();} public int getUserid() { return userid; } public void setUserid(int userid) { this.userid = userid; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } }UserInfoDBManger.java
/** * FileName: UserInfoDBManger.java * @Description: TODO 連接數據庫的操作* Copyright: personage * Company personage * @author: gaoxing * @version V1.0 * Createdate: 2014-5-25 下午2:47:38 * * Modification History: * Date Author Version Discription * ----------------------------------------------------------------------------------- * 2014-5-25 GX 1.0 1.0 * Why & What is modified: <修改原因描述> */package com.org.user.db; import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException; import com.mysql.jdbc.Connection;import com.mysql.jdbc.PreparedStatement; /** * @ClassName: UserInfoDBManger * @Description:TODO連接數據庫的操作* @author: gaoxing * @date: 2014-5-25 下午2:47:38 */public class UserInfoDBManger { private static Connection conn = null; private PreparedStatement ps = null; private ResultSet rs = null; public static Connection getConn() { String url = "jdbc:mysql://localhost:3306/test"; try { Class.forName("com.mysql.jdbc.Driver"); try { conn = (Connection) DriverManager.getConnection(url, "root", "mysql"); } catch (SQLException e) { System.out.println(e.getMessage()); } } catch (ClassNotFoundException e) { System.out.println(e.getMessage()); } return conn; } public void close() { try { rs.close(); ps.close(); conn.close(); } catch (SQLException e) { e.getMessage(); } } }UserInfoDao.java
/** * FileName: UserInfoDao.java * @Description: TODO 處理通過數據庫的連接進行操作對象信息* Copyright: personage * Company personage * @author: gaoxing * @version V1.0 * Createdate: 2014-5-25 下午2:36:09 * * Modification History: * Date Author Version Discription * ----------------------------------------------------------------------------------- * 2014-5-25 GX 1.0 1.0 * Why & What is modified: <修改原因描述> */package com.org.user.dao; import java.sql.ResultSet;import java.sql.SQLException;import java.util.ArrayList;import java.util.List; import com.mysql.jdbc.Connection;import com.mysql.jdbc.PreparedStatement;import com.org.user.db.UserInfoDBManger;import com.org.user.model.UserInfo; /** * @ClassName: UserInfoDao * @Description:TODO處理通過數據庫的連接進行操作對象信息* @author: gaoxing * @date: 2014-5-25 下午2:36:09 */public class UserInfoDao { Connection conn=null; PreparedStatement ps=null; ResultSet rs=null; public List<UserInfo> find(){ List<UserInfo> list=new ArrayList<UserInfo>(); String sql="select * from t_userinfo "; conn=UserInfoDBManger.getConn(); try { ps=(PreparedStatement) conn.prepareStatement(sql); rs=ps.executeQuery(); while (rs.next()) { UserInfo ui=new UserInfo(); ui.setUserid(rs.getInt(1)); ui.setUsername(rs.getString(2)); ui.setPassword(rs.getString(3)); list.add(ui); } } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } return list; }}UserInfoTest.java
/** * FileName: UserInfoTest.java * @Description: TODO測試dao包的方法* Copyright: personage * Company personage * @author: gaoxing * @version V1.0 * Createdate: 2014-5-25 下午5:43:03 * * Modification History: * Date Author Version Discription * ----------------------------------------------------------------------------------- * 2014-5-25 GX 1.0 1.0 * Why & What is modified: <修改原因描述> */package com.org.user.test; import static org.junit.Assert.*; import java.util.List; import org.junit.AfterClass;import org.junit.BeforeClass;import org.junit.Test; import com.org.user.dao.UserInfoDao;import com.org.user.model.UserInfo; /** * @ClassName: UserInfoTest * @Description:TODO 測試dao包的方法* @author: gaoxing * @date: 2014-5-25 下午5:43:03 */public class UserInfoTest { /** * @Title: setUpBeforeClass * @Description: TODO(描述這個方法的作用) * @param: @throws java.lang.Exception * @return: void * @throws */ @BeforeClass public static void setUpBeforeClass() throws Exception { } /** * @Title: tearDownAfterClass * @Description: TODO(描述這個方法的作用) * @param: @throws java.lang.Exception * @return: void * @throws */ @AfterClass public static void tearDownAfterClass() throws Exception { } /** * Test method for {@link com.org.user.dao.UserInfoDao#find()}. */ @Test public void testFind() { UserInfoDao udao=new UserInfoDao(); List<UserInfo> list=udao.find(); for (int i = 0; i < list.size(); i++) { UserInfo ui=list.get(i); System.out.println("名稱: "+ui.getUsername()+"密碼: "+ui.getPassword()); } } }4、在編寫好類內容之後，在搭建項目過程中要加入輔助的JUnit的測試包junit.jar，同時也要導入數據庫的連接mysq-connector-java-5.1.7-bin.jar sqljdbc.jar,這樣才可以連接到數據庫；
5、所有的工作做好之後，就可以啟動服務進行運行了查看結果了，如果在JUnit測試台和控制台出現如下結果就表示項目運行成功了。
以上就是小編為大家帶來的java實現連接mysql數據庫單元測試查詢數據的實例代碼全部內容了，希望大家多多支持武林網~