java连接没密码代码 java登录密码错误提示

java连接网络mysql不暴露账号密码

可以设置不暴露。

可以通过如下环境变量强制Linux不记录敏感历史命令，在命令行执行HISTCONTROL等于ignorespace后，再输入带密码的命令的前面加一个空格登录，登录命令不会被记录到历史记录里，操作完敏感的命令后可以及时删除命令行记录执行historyd历史命令序号清除指定历史记录命令。

相关问答

Q1: java连接数据库的代码

package mysql;

import java.sql.*;

/**

* @author xys

*/

public class ConnectMysql {

public static Connection getConnection() throws ClassNotFoundException, SQLException {

String url = "jdbc:mysql://localhost:3306/databaseName";

String user = "mysqluser";

String password = "password";

String driverClass = "com.mysql.cj.jdbc.Driver";

Connection connection = null;

Class.forName(driverClass);

try {

connection = DriverManager.getConnection(url, user, password);

} catch (SQLException e) {

e.printStackTrace();

}

if (connection != null) {

System.out.println("数据库连接成功");

} else {

System.out.println("数据库连接失败");

connection.close();

}

return connection;

}

public void getResult() throws ClassNotFoundException, SQLException {

// 实例化 Statement 对象

Statement statement = getConnection().createStatement();

// 要执行的 Mysql 数据库操作语句（增、删、改、查）

String sql = "";

// 展开结果集数据库

ResultSet resultSet = statement.executeQuery(sql);

while (resultSet.next()) {

// 通过字段检索

int id = resultSet.getInt("id");

String name = resultSet.getString("name");

// 输出数据

System.out.println("ID : " +id);

System.out.println("name :" + name);

}

// 完成后需要依次关闭

resultSet.close();

statement.close();

getConnection().close();

}

}

Q2: 用java怎么连接没有用户名和密码的SQL数据

用java怎么连接没有用户名和密码java连接没密码代码的SQL数据库

: 去看连接数据库java连接没密码代码的配置文件,具体要看你采用的哪种连接模式,配置文件可能为.properties 或.xml 也可能直接写在.java里面

Q3: java ftp上传文件 没有用户名密码

上传下载java连接没密码代码的代码

import java.io.BufferedReader;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import sun.net.TelnetOutputStream;

import sun.net.TelnetInputStream;

import sun.net.;

public class download {

String localfilename;

String remotefilename;

FtpClient ftpClient;

// serverjava连接没密码代码：服务器名字

// userjava连接没密码代码：用户名

// passwordjava连接没密码代码：密码

// path：服务器上java连接没密码代码的路径

public void connectServer(String ip, int port,String user

, String password,String path) {

try {

ftpClient = new FtpClient();

ftpClient.openServer(ip,port);

ftpClient.login(user, password);

System.out.println("login success!");

if (path.length() != 0) ftpClient.cd(path);

ftpClient.binary();

} catch (IOException ex) {

System.out.println("not login");

System.out.println(ex);

}

}

public void closeConnect() {

try {

ftpClient.closeServer();

System.out.println("disconnect success");

} catch (IOException ex) {

System.out.println("not disconnect");

System.out.println(ex);

}

}

public void upload() {

this.localfilename = "D://test2//test.txt";

this.remotefilename = "test.txt";

try {

TelnetOutputStream os = ftpClient.put(this.remotefilename);

java.io.File file_in = new java.io.File(this.localfilename);

FileInputStream is = new FileInputStream(file_in);

byte[] bytes = new byte[1024];

int c;

while ((c = is.read(bytes)) != -1) {

os.write(bytes, 0, c);

}

System.out.println("upload success");

is.close();

os.close();

} catch (IOException ex) {

System.out.println("not upload");

System.out.println(ex);

}

}

public void download() {

try {

TelnetInputStream is = ftpClient.get(this.remotefilename);

java.io.File file_in = new java.io.File(this.localfilename);

FileOutputStream os = new FileOutputStream(file_in);

byte[] bytes = new byte[1024];

int c;

while ((c = is.read(bytes)) != -1) {

// System.out.println((char)is.read());

// System.out.println(file_in);

os.write(bytes, 0, c);

}

System.out.println("download success");

os.close();

is.close();

} catch (IOException ex) {

System.out.println("not download");

System.out.println(ex);

}

}

public void download(String remotePath,String remoteFile,String localFile) {

try {

if (remotePath.length() != 0) ftpClient.cd(remotePath);

TelnetInputStream is = ftpClient.get(remoteFile);

java.io.File file_in = new java.io.File(localFile);

FileOutputStream os = new FileOutputStream(file_in);

byte[] bytes = new byte[1024];

int c;

while ((c = is.read(bytes)) != -1) {

// System.out.println((char)is.read());

// System.out.println(file_in);

os.write(bytes, 0, c);

}

System.out.println("download success");

os.close();

is.close();

} catch (IOException ex) {

System.out.println("not download");

System.out.println(ex);

}

}

public void download(String remoteFile,String localFile) {

try {

TelnetInputStream is = ftpClient.get(remoteFile);

java.io.File file_in = new java.io.File(localFile);

FileOutputStream os = new FileOutputStream(file_in);

byte[] bytes = new byte[1024];

int c;

while ((c = is.read(bytes)) != -1) {

// System.out.println((char)is.read());

// System.out.println(file_in);

os.write(bytes, 0, c);

}

System.out.println("download success");

os.close();

is.close();

} catch (IOException ex) {

System.out.println("not download");

System.out.println(ex);

}

}

public static void main(String agrs[]) {

String filepath[] = { "/callcenter/index.jsp", "/callcenter/ip.txt",

"/callcenter/mainframe/image/processing_bar_2.gif",

"/callcenter/mainframe/image/logo_01.jpg" };

String localfilepath[] = { "C:\\FTP_Test\\index.jsp",

"C:\\FTP_Test\\ip.txt", "C:\\FTP_Test\\processing_bar_2.gif",

"C:\\FTP_Test\\logo_01.jpg" };

download fu = new download();

fu.connectServer("172.16.1.66",22, "web_test", "123456","/callcenter");

for(int i=0;ifilepath.length;i++){

fu.download(filepath[i],localfilepath[i]);

}

//fu.upload();

//fu.download();

fu.closeConnect();

}

}

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