写了3个BEAN,Check.java,DB.JAVA,Login.java 其中Login.java需调用Check.java和DB.JAVA的方法 但是Login.java再编译的时候提示出错 下面是代码
Check.java
package rlzygl;/**
* Created by IntelliJ IDEA.
* User: xu
* Date: 2008-12-18
* Time: 11:15:09
* To change this template use File | Settings | File Templates.
*/
public class Checkstr {
public Checkstr(){}
public String dostring(String str){
str=str.replaceAll("&","&");
str=str.replaceAll("<","<");
str=str.replaceAll(">",">");
str=str.replaceAll("","");
str=str.replaceAll(";","");
str=str.replaceAll("--","");
str=str.replaceAll("/","");
str=str.replaceAll("%","");
return str;
}
}DB.JAVA
package rlzygl;import java.sql.Connection;
import java.sql.Statement;
import java.sql.ResultSet;
import java.sql.DriverManager;/**
* Created by IntelliJ IDEA.
* User: xu
* Date: 2008-12-18
* Time: 11:20:56
* To change this template use File | Settings | File Templates.
*/
public class DB {
private Connection con;
private Statement stm;
private ResultSet rs;
private String classname="sun.jdbc.odbc.JdbcOdbcDriver";
public DB(){}
public Connection getCon(){
try{
Class.forName(classname); //加载并注册驱动
}
catch(ClassNotFoundException e){
e.printStackTrace();
}
try{
con= DriverManager.getConnection("jdbc:odbc:rlzygl","",""); //得到和数据库的连接
}
catch(Exception e){
e.printStackTrace(System.err);
con=null;
}
return con;
}
public Statement getStm(){
try{
con=getCon();
stm=con.createStatement();
}catch(Exception e){
e.printStackTrace(System.err);
}
return stm;
}
public ResultSet search(String sql){
if(sql==null)sql="";
try{
stm=getStm();
rs=stm.executeQuery(sql);
}catch(Exception e){
e.printStackTrace();
}
return rs;
}
}LOGIN.JAVA
package rlzygl;import java.sql.ResultSet;/**
* Created by IntelliJ IDEA.
* User: xu
* Date: 2008-12-18
* Time: 11:40:59
* To change this template use File | Settings | File Templates.
*/
public class Login {
private String username;
private String password;
private Checkstr check=new Checkstr();
public Login(){}
public void setUsername(String username){
this.username=check.dostring(username);
}
public void setPassword(String password){
this.password=check.dostring(password);
}
public String checklogin(){
String backmess="";
boolean =true;
if(this.username.equals("")){
=false;
backmess+="<li>请输入<b>用户名</b></li></br>";
}
if(this.password.equals("")){
=false;
backmess+="<li>请输入<b>密码</b></li></br>";
}
if(!){
return backmess;
}
String sql="select * from admin where id='"+this.username+"'and psw='"+this.password+"'";
DB db=new DB();
ResultSet rs=db.search(sql);
try{
if(rs.next()){ }else{
backmess="登陆失败!<b>输入的<b>用户名</b>或<b>密码</b>不正确!";
}
}
catch(Exception e)
{e.printStackTrace();
backmess="操作失败!";
}
return backmess;
}
}都放在同一个包下面
Check.java
package rlzygl;/**
* Created by IntelliJ IDEA.
* User: xu
* Date: 2008-12-18
* Time: 11:15:09
* To change this template use File | Settings | File Templates.
*/
public class Checkstr {
public Checkstr(){}
public String dostring(String str){
str=str.replaceAll("&","&");
str=str.replaceAll("<","<");
str=str.replaceAll(">",">");
str=str.replaceAll("","");
str=str.replaceAll(";","");
str=str.replaceAll("--","");
str=str.replaceAll("/","");
str=str.replaceAll("%","");
return str;
}
}DB.JAVA
package rlzygl;import java.sql.Connection;
import java.sql.Statement;
import java.sql.ResultSet;
import java.sql.DriverManager;/**
* Created by IntelliJ IDEA.
* User: xu
* Date: 2008-12-18
* Time: 11:20:56
* To change this template use File | Settings | File Templates.
*/
public class DB {
private Connection con;
private Statement stm;
private ResultSet rs;
private String classname="sun.jdbc.odbc.JdbcOdbcDriver";
public DB(){}
public Connection getCon(){
try{
Class.forName(classname); //加载并注册驱动
}
catch(ClassNotFoundException e){
e.printStackTrace();
}
try{
con= DriverManager.getConnection("jdbc:odbc:rlzygl","",""); //得到和数据库的连接
}
catch(Exception e){
e.printStackTrace(System.err);
con=null;
}
return con;
}
public Statement getStm(){
try{
con=getCon();
stm=con.createStatement();
}catch(Exception e){
e.printStackTrace(System.err);
}
return stm;
}
public ResultSet search(String sql){
if(sql==null)sql="";
try{
stm=getStm();
rs=stm.executeQuery(sql);
}catch(Exception e){
e.printStackTrace();
}
return rs;
}
}LOGIN.JAVA
package rlzygl;import java.sql.ResultSet;/**
* Created by IntelliJ IDEA.
* User: xu
* Date: 2008-12-18
* Time: 11:40:59
* To change this template use File | Settings | File Templates.
*/
public class Login {
private String username;
private String password;
private Checkstr check=new Checkstr();
public Login(){}
public void setUsername(String username){
this.username=check.dostring(username);
}
public void setPassword(String password){
this.password=check.dostring(password);
}
public String checklogin(){
String backmess="";
boolean =true;
if(this.username.equals("")){
=false;
backmess+="<li>请输入<b>用户名</b></li></br>";
}
if(this.password.equals("")){
=false;
backmess+="<li>请输入<b>密码</b></li></br>";
}
if(!){
return backmess;
}
String sql="select * from admin where id='"+this.username+"'and psw='"+this.password+"'";
DB db=new DB();
ResultSet rs=db.search(sql);
try{
if(rs.next()){ }else{
backmess="登陆失败!<b>输入的<b>用户名</b>或<b>密码</b>不正确!";
}
}
catch(Exception e)
{e.printStackTrace();
backmess="操作失败!";
}
return backmess;
}
}都放在同一个包下面
在同一个包下,编译错误如下:
Login.java:15: 找不到符号
符号: 类 Checkstr
位置: 类 rlzygl.Login
private Checkstr check=new Checkstr();
^
Login.java:15: 找不到符号
符号: 类 Checkstr
位置: 类 rlzygl.Login
private Checkstr check=new Checkstr();
^
Login.java:38: 找不到符号
符号: 类 DB
位置: 类 rlzygl.Login
DB db=new DB();
^
Login.java:38: 找不到符号
符号: 类 DB
位置: 类 rlzygl.Login
DB db=new DB();
^
4 错误
用JAVAC Login.java的时候就提示出粗
javac -d c: *.java