系統(tǒng)->高級(jí)):   java_home=D:\Java\jdk1.5.0_01   path..." />

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使用servlet和JavaBean訪(fǎng)問(wèn)MySQL

時(shí)間:2008-10-07 04:12:00   來(lái)源:無(wú)憂(yōu)考網(wǎng)     [字體: ]
使用Servlet和Java Bean訪(fǎng)問(wèn)MySQL

  運(yùn)行環(huán)境: JDK 5.0 + Tomcat 5.5.4

  JDK安裝路徑: D:\Java\jdk1.5.0_01
  Tomcat安裝路徑:D:\Tomcat 5.5

  設(shè)置環(huán)境變量(控制面板->系統(tǒng)->高級(jí)):
  java_home=D:\Java\jdk1.5.0_01
  path=%JAVA_HOME%\bin
  classpath=.;D:\Java\jdk1.5.0_01\lib\dt.jar;D:\Java\jdk1.5.0_01\lib\tools.jar;D:\Tomcat 5.5\common\lib\servlet-api.jar;D:\Tomcat 5.5\common\lib\mysql-connector-java-3.1.6-bin.jar;


  其中D:\Tomcat 5.5\common\lib\servlet-api.jar為T(mén)omcat的servlet API實(shí)現(xiàn),一定要加上,不如無(wú)法編譯servlet
  D:\Tomcat 5.5\common\lib\mysql-connector-java-3.1.6-bin.jar;是MySQL的JDBC驅(qū)動(dòng),connect/J 3.1.6,可到MySQL官方網(wǎng)站下載

  Tomcat5.5虛擬目錄設(shè)定:
  D:\Tomcat 5.5\conf\Catalina\localhost下新加一test.XML
  內(nèi)容如下:
  
  

  d:\www路徑將是我們測(cè)試網(wǎng)站的根目錄,通過(guò)http://localhost:8080/test訪(fǎng)問(wèn)該虛擬目錄
  d:\www下建有目錄Web-INF,下有web.xml設(shè)置文件(可參考D:\Tomcat 5.5\webapps\ROOT\WEB-INF\web.xml),classes目錄和lib目錄

  //連接數(shù)據(jù)庫(kù)的Java Bean文件名dbconn.java
  package NinGoo;
  import java.sql.*;
  public class dbconn {
  public dbconn() {
  }
  //declare variable
  private Connection conn = null;
  ResultSet rs = null;
  private String server = "127.0.0.1";
  private String port = "3306";
  private String db = "test";
  private String user = "root";
  private String pass = "password";
  private String drivername="com.mysql.jdbc.Driver";
  private String URL="jdbc:mysql://"+server+":"+port+"/"+db+"?user="+user+"&password="+pass;

  public Connection getConn(){//get database connection
  try{
  Class.forName(drivername).newInstance();
  conn = DriverManager.getConnection(URL);
  }
  catch(Exception e){
  e.printStackTrace();
  }
  return this.conn ;
  }

  public ResultSet executeSQL(String str) {
  try{
  Statement stmt = conn.createStatement();
  rs = stmt.executeQuery(str);
  }
  catch(Exception e){
  e.printStackTrace();
  }
  return this.rs;
  }
  }

  編譯javac welcome.java,將編譯后的文件welcome.class放到目錄D:\www\WEB-INF\classes\NinGoo\下

  //調(diào)用Java Bean的servlet welcome.java
  import java.io.*;
  import javax.servlet.*;
  import javax.servlet.http.*;
  import java.sql.*;