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之前一段时间一直忙于毕业设计，也没有空学习了，本篇继续学习。
本篇将开始学习java web下使用servlet下来操作数据库，并展示到界面上的使用方法。
新建工程ServletMvc001。
目录结构如下：
web.xml
1 <?xml version="1.0" encoding="UTF-8"?> 2 <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 3 xmlns="http://java.sun.com/xml/ns/javaee" 4 xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" 5 id="WebApp_ID" version="3.0"> 6 <display-name>ServletMvc001</display-name> 7 <welcome-file-list> 8 <welcome-file>logon.jsp</welcome-file> 9 </welcome-file-list> 10 <servlet> 11 <servlet-name>logOnServlet</servlet-name> 12 <servlet-class>com.dx.javamvc.servlets.LogOnServlet</servlet-class> 13 </servlet> 14 <servlet-mapping> 15 <servlet-name>logOnServlet</servlet-name> 16 <url-pattern>/LogOnServlet</url-pattern> 17 </servlet-mapping> 18 </web-app>
logon.jsp
1 <%@ page language="java" contentType="text/html; charset=UTF-8" 2 pageEncoding="UTF-8"%> 3 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 4 <html> 5 <head> 6 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 7 <title>Insert title here</title> 8 </head> 9 <body> 10 <form name="form1" id="form1" method="get" action="LogOnServlet"> 11 <input type="submit" id="btnOk" name="btnOk" value="提交" /> 12 </form> 13 </body> 14 </html>
showPerfileInfo.jsp
1 <%@page import="com.mysql.fabric.Response"%> 2 <%@page import="java.util.List" %> 3 <%@page import="com.dx.javamvc.entity.User" %> 4 <%@ page language="java" contentType="text/html; charset=UTF-8" 5 pageEncoding="UTF-8" %> 6 7 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 8 <html> 9 <head> 10 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 11 <title>Insert title here</title> 12 </head> 13 <body> 14 <% List<User> userItem= (List<User>)request.getAttribute("UserItems"); %> 15 <%for(User user :userItem){ 16 out.write("llddd"); 17 %> 18 <%=user.getId() %><br/> 19 <%=user.getUserName() %><br/> 20 <%=user.getPassword() %><br/> 21 <% 22 } %> 23 </body> 24 </html>
jdbc.properties
1 DriverClass=com.mysql.jdbc.Driver 2 3 JdbcUrl=jdbc:mysql://localhost:3306/servletmvc001 4 5 UserName=root 6 7 Password=123456
DbConfiguration.java
1 package com.dx.javamvc.configuration; 2 3 import java.io.*; 4 import java.net.URISyntaxException; 5 import java.util.*; 6 7 public class DbConfiguration { 8 private static final String FILENAME = "jdbc.properties"; 9 private static String userName = null; 10 private static String password = null; 11 private static String jdbcUrl = null; 12 private static String driverClass = null; 13 14 public DbConfiguration() { 15 Properties property = new Properties(); 16 17 try { 18 String path = this.getClass().getClassLoader().getResource("").toURI().getPath(); 19 FileInputStream inStream = new FileInputStream(new File(path + FILENAME)); 20 property.load(inStream); 21 setUserName(property.getProperty("UserName")); 22 setPassword(property.getProperty("Password")); 23 setJdbcUrl(property.getProperty("JdbcUrl")); 24 setDriverClass(property.getProperty("DriverClass")); 25 } catch (URISyntaxException e) { 26 // TODO Auto-generated catch block 27 e.printStackTrace(); 28 } catch (FileNotFoundException e) { 29 // TODO Auto-generated catch block 30 e.printStackTrace(); 31 } catch (IOException e) { 32 // TODO Auto-generated catch block 33 e.printStackTrace(); 34 } 35 } 36 37 public String getUserName() { 38 return userName; 39 } 40 41 private void setUserName(String userName) { 42 DbConfiguration.userName = userName; 43 } 44 45 public String getPassword() { 46 return password; 47 } 48 49 private void setPassword(String password) { 50 DbConfiguration.password = password; 51 } 52 53 public String getJdbcUrl() { 54 return jdbcUrl; 55 } 56 57 private void setJdbcUrl(String jdbcUrl) { 58 DbConfiguration.jdbcUrl = jdbcUrl; 59 } 60 61 public String getDriverClass() { 62 return driverClass; 63 } 64 65 private void setDriverClass(String driverClass) { 66 DbConfiguration.driverClass = driverClass; 67 } 68 69 }
SexType.java
1 package com.dx.javamvc.entity; 2 3 public enum SexType { 4 Mail(0), Femail(1); 5 6 private int value; 7 8 private SexType(int value) { 9 setValue(value); 10 } 11 12 public int getValue() { 13 return value; 14 } 15 16 public void setValue(int value) { 17 this.value = value; 18 } 19 20 public static SexType valueOf(int value) { 21 SexType sexType; 22 switch (value) { 23 case 1: 24 sexType = SexType.Femail; 25 break; 26 default: 27 sexType = SexType.Mail; 28 break; 29 } 30 31 return sexType; 32 } 33 }
User.java
1 package com.dx.javamvc.entity; 2 3 import java.util.Date; 4 5 public class User { 6 private int id; 7 private String userName; 8 private String password; 9 private SexType sex; 10 private Date createDate; 11 12 public int getId() { 13 return id; 14 } 15 16 public void setId(int id) { 17 this.id = id; 18 } 19 20 public String getUserName() { 21 return userName; 22 } 23 24 public void setUserName(String userName) { 25 this.userName = userName; 26 } 27 28 public String getPassword() { 29 return password; 30 } 31 32 public void setPassword(String password) { 33 this.password = password; 34 } 35 36 public SexType getSex() { 37 return sex; 38 } 39 40 public void setSex(SexType sex) { 41 this.sex = sex; 42 } 43 44 public Date getCreateDate() { 45 return createDate; 46 } 47 48 public void setCreateDate(Date createDate) { 49 this.createDate = createDate; 50 } 51 }
DbUtil.java
1 package com.dx.javamvc.utils; 2 3 import java.sql.Connection; 4 import java.sql.DriverManager; 5 import java.sql.PreparedStatement; 6 import java.sql.ResultSet; 7 import java.sql.SQLException; 8 9 import com.dx.javamvc.configuration.DbConfiguration; 10 import com.dx.javamvc.types.IExecuteQueryAction; 11 import com.dx.javamvc.types.IPreparedStatementAction; 12 13 public class DbUtil { 14 public static void executeQuery(String sql, IPreparedStatementAction preparedStatementAction, 15 IExecuteQueryAction executeQueryAction) { 16 Connection connection = null; 17 PreparedStatement preparedStatement = null; 18 ResultSet resultSet = null; 19 20 DbConfiguration configuration=new DbConfiguration(); 21 String driverClass = configuration.getDriverClass(); 22 String jdbcUrl = configuration.getJdbcUrl(); 23 String userName = configuration.getUserName(); 24 String password = configuration.getPassword(); 25 26 try { 27 Class.forName(driverClass); 28 29 connection = DriverManager.getConnection(jdbcUrl, userName, password); 30 preparedStatement = connection.prepareStatement(sql); 31 32 if (preparedStatementAction != null) { 33 preparedStatementAction.action(preparedStatement); 34 } 35 36 resultSet = preparedStatement.executeQuery(); 37 38 if (executeQueryAction != null) { 39 executeQueryAction.action(resultSet); 40 } 41 } catch (ClassNotFoundException e) { 42 // TODO Auto-generated catch block 43 e.printStackTrace(); 44 } catch (SQLException e) { 45 // TODO Auto-generated catch block 46 e.printStackTrace(); 47 } finally { 48 if (resultSet != null) { 49 try { 50 resultSet.close(); 51 } catch (SQLException e) { 52 // TODO Auto-generated catch block 53 e.printStackTrace(); 54 } 55 } 56 if (preparedStatement != null) { 57 try { 58 preparedStatement.close(); 59 } catch (SQLException e) { 60 // TODO Auto-generated catch block 61 e.printStackTrace(); 62 } 63 } 64 if (connection != null) { 65 try { 66 connection.close(); 67 } catch (SQLException e) { 68 // TODO Auto-generated catch block 69 e.printStackTrace(); 70 } 71 } 72 } 73 74 } 75 76 }
IExecuteQueryAction.java
1 package com.dx.javamvc.types; 2 3 import java.sql.ResultSet; 4 import java.sql.SQLException; 5 6 public interface IExecuteQueryAction { 7 void action(ResultSet result) throws SQLException; 8 }
IPreparedStatementAction.java
1 package com.dx.javamvc.types; 2 3 import java.sql.PreparedStatement; 4 import java.sql.SQLException; 5 6 public interface IPreparedStatementAction { 7 void action(PreparedStatement preparedStatement) throws SQLException; 8 }
UserDao.java
1 package com.dx.javamvc.domain; 2 3 import java.sql.PreparedStatement; 4 import java.sql.ResultSet; 5 import java.sql.SQLException; 6 import java.util.ArrayList; 7 import java.util.List; 8 9 import com.dx.javamvc.entity.SexType; 10 import com.dx.javamvc.entity.User; 11 import com.dx.javamvc.types.IPreparedStatementAction; 12 import com.dx.javamvc.types.IExecuteQueryAction; 13 import com.dx.javamvc.utils.DbUtil; 14 15 public class UserDao { 16 public List<User> getUserByUserName(final String userName) { 17 final List<User> userItems = new ArrayList<User>(); 18 19 String sql = "Select * From User Where Name=?"; 20 21 IPreparedStatementAction preparedStatementAction = new IPreparedStatementAction() { 22 @Override 23 public void action(PreparedStatement preparedStatement) throws SQLException { 24 preparedStatement.setString(1, userName); 25 } 26 }; 27 28 IExecuteQueryAction executeQueryAction = new IExecuteQueryAction() { 29 @Override 30 public void action(ResultSet result) throws SQLException { 31 try { 32 while (result.next()) { 33 User user = new User(); 34 35 user.setId(result.getInt("Id")); 36 user.setUserName(result.getString("Name")); 37 user.setPassword(result.getString("Password")); 38 user.setSex(SexType.valueOf(result.getInt("Sex"))); 39 user.setCreateDate(result.getDate("CreateDate")); 40 41 userItems.add(user); 42 } 43 } catch (SQLException e) { 44 e.printStackTrace(); 45 } 46 } 47 }; 48 49 DbUtil.executeQuery(sql, preparedStatementAction, executeQueryAction); 50 51 return userItems; 52 53 } 54 }
LogOnServlet.java
1 package com.dx.javamvc.servlets; 2 3 import java.io.IOException; 4 import java.util.List; 5 6 import javax.servlet.ServletException; 7 import javax.servlet.http.HttpServlet; 8 import javax.servlet.http.HttpServletRequest; 9 import javax.servlet.http.HttpServletResponse; 10 11 import com.dx.javamvc.domain.UserDao; 12 import com.dx.javamvc.entity.User; 13 14 public class LogOnServlet extends HttpServlet { 15 private static final long serialVersionUID = -8807878351076369807L; 16 private static final UserDao userDao = new UserDao(); 17 18 @Override 19 protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { 20 List<User> userItems = userDao.getUserByUserName("yy3b2007com"); 21 req.setAttribute("UserItems", userItems); 22 req.getRequestDispatcher("/showPerfileInfo.jsp").forward(req, resp); 23 } 24 }
Java Servlet(七)：JavaWeb MVC 操作(jdk7+tomcat7+eclipse)
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原文地址：http://www.cnblogs.com/yy3b2007com/p/5463859.html
