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1、 WORD 使用Eclipse+MyEclipse+MySql开发一个用户注册登录系统 分类： Java 2007-09-07 03:38 2389人阅读 评论(3) 收藏举报今天我在上篇文章搭建好的开发环境下写了个简单的用户注册登录系统，拿出来和大家分享一下。1.开启Eclipse，单击FlieNewProject.出现New Project对话框如下图。选择MyEclipseJ2EE ProjectsWeb Project单击Next如下图。在Project Name文本框中写入logindemo其它保持默认选项单击Finish按钮。此时在Package Explorer(包浏览器)中出现
2、我们新建的项目，把项目展开在src文件夹上单击右键选择NewPackage出现New Java Package对话框如下图在Name文本框中写入register单击Finish按钮。在src文件夹中新建了一个register包，用同样的方法在src文件夹中建一个login包。右键单击register包选择NewClass出现New Java Class对话框如下图在Name文本框中填写Register单击Finish按钮。在register包下生成Register.java文件，更改其容如下：packageregister;importjava.io.*;importjava.util.*;i
3、mportjavax.servlet.*;importjavax.servlet. .*;importjava.sql.*;/import.mysql.jdbc.*;publicclassRegisterextends ServletprivateStringname;privateStringpass;privateStringconfirm;publicsynchronizedvoiddoPost( ServletRequestrequest, ServletResponseresponse)throwsServletException,IOExceptionthis.name=reque
4、st.getParameter(account);this.pass=request.getParameter(password);this.confirm=request.getParameter(confirm);PrintWriterout=response.getWriter();/驱动程序名StringdriverName=.mysql.jdbc.Driver;/数据库用户名StringuserName=root;/密码StringuserPasswd=123;/数据库名StringdbName=database;/表名StringtableName=users;/联结字符串Stri
5、ngurl=jdbc:mysql:/localhost/+dbName+?user=+userName+&password=+userPasswd;tryClass.forName(org.gjt.mm.mysql.Driver);Connectionconnection=DriverManager.getConnection(url);Statementstatement=connection.createStatement();Stringsql=SELECT*FROM+tableName;ResultSetrs=statement.executeQuery(sql);while(true
6、)if(rs.next()if(this.name.equals(rs.getString(1)out.print(+UserNameisinDatabase!);break;elsesql=INSERTINTO+tableName+VALUES(+this.name+,+this.pass+);statement.execute(sql);out.print(+RegisterSuccessful!);break;return;catch(SQLExceptione)catch(ClassNotFoundExceptione)publicsynchronizedvoiddoGet( Serv
7、letRequestrequest, ServletResponseresponse)throwsServletException,IOExceptiondoPost(request,response);用同样的方法在login包下建一个Login.java文件，其容如下：packagelogin;importjava.io.*;importjava.util.*;importjavax.servlet.*;importjavax.servlet. .*;importjava.sql.*;/import.mysql.jdbc.*;publicclassLoginextends Servletp
8、rivateStringname;privateStringpass;publicsynchronizedvoiddoPost( ServletRequestrequest, ServletResponseresponse)throwsServletException,IOExceptionthis.name=request.getParameter(account);this.pass=request.getParameter(password);PrintWriterout=response.getWriter();/驱动程序名StringdriverName=.mysql.jdbc.Dr
9、iver;/数据库用户名StringuserName=root;/密码StringuserPasswd=123;/数据库名StringdbName=database;/表名StringtableName=users;/联结字符串Stringurl=jdbc:mysql:/localhost/+dbName+?user=+userName+&password=+userPasswd;tryClass.forName(org.gjt.mm.mysql.Driver);Connectionconnection=DriverManager.getConnection(url);Statementsta
10、tement=connection.createStatement();Stringsql=SELECT*FROM+tableName;ResultSetrs=statement.executeQuery(sql);while(true)if(rs.next()if(this.name.equals(rs.getString(1)&(this.pass.equals(rs.getString(2)out.print(+LoginSuccess!);break;elseout.print(+AccountorPasswordIsInvalid!);break;return;catch(SQLExceptione)catch(ClassNotFoundExceptione)publicsynchronizedvoiddoGet( ServletRequestrequest, ServletResponseresponse)throwsServletExceptio
