1.2 jcifs
Jcifs pan>是一个用JAVA开发的SMB客户端库,利用jcifs可以操作windows共享文件,可以得到域用户,实现单点登录,最新版本为:1.3.12,官方网址:http://jcifs.samba.org/
2. 代码实现
package uploadSMB;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import jcifs.smb.SmbFile;
import jcifs.smb.SmbFileInputStream;
import jcifs.smb.SmbFileOutputStream;
public class UploadDownloadUtil {
/**
* Description: 从共享目录拷贝文件到本地
* @Version1.0 Sep 25, 2009 3:48:38 PM
* @param remoteUrl 共享目录上的文件路径
* @param localDir 本地目录
*/
public void smbGet(String remoteUrl,String localDir) {
InputStream in = null;
OutputStream out = null;
try {
SmbFile remoteFile = new SmbFile(remoteUrl);
if(remoteFile==null){
System.out.println("共享文件不存在");
return;
}
String fileName = remoteFile.getName();
File localFile = new File(localDir+File.separator+fileName);
in = new BufferedInputStream(new SmbFileInputStream(remoteFile));
out = new BufferedOutputStream(new FileOutputStream(localFile));
byte[] buffer = new byte[1024];
while(in.read(buffer)!=-1){
out.write(buffer);
buffer = new byte[1024];
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
out.close();
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* Description: 从本地上传文件到共享目录
* @Version1.0 Sep 25, 2009 3:49:00 PM
* @param remoteUrl 共享文件目录
* @param localFilePath 本地文件绝对路径
*/
public void smbPut(String remoteUrl,String localFilePath) {
InputStream in = null;
OutputStream out = null;
try {
File localFile = new File(localFilePath);
String fileName = localFile.getName();
SmbFile remoteFile = new SmbFile(remoteUrl+"/"+fileName);
in = new BufferedInputStream(new FileInputStream(localFile));
out = new BufferedOutputStream(new SmbFileOutputStream(remoteFile));
byte[] buffer = new byte[1024];
while(in.read(buffer)!=-1){
out.write(buffer);
buffer = new byte[1024];
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
out.close();
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public static void main(String[] args){
UploadDownloadUtil test = new UploadDownloadUtil() ;
// smb:域名;用户名:密码@目的IP/文件夹/文件名.xxx
//test.smbGet("smb://szpcg;jiang.t:xxx@192.168.193.13/Jake/test.txt", "c://") ;
test.smbPut("smb://szpcg;jiang.t:xxx@192.168.193.13/Jake", "c://test.txt") ;
}
}
2.3 remoteUrl说明
remoteUrl如何填写是值得注意的
如果是无需密码的共享,则类似如下格式:
smb://ip/sharefolder(例如:smb://192.168.0.77/test)
如果需要用户名、密码,则类似如下格式:
Smb://username:password@ip/sharefolder(例如:smb://chb:123456@192.168.0.1/test)
// smb:域名;用户名:密码@目的IP/文件夹/文件名.xxx
//test.smbGet("smb://szpcg;jiang.t:xxx@192.168.193.13/Jake/test.txt", "c://") ;
test.smbPut("smb://szpcg;jiang.t:xxx@192.168.193.13/Jake", "c://test.txt") ;

To optimize MySQL slow query, slowquerylog and performance_schema need to be used: 1. Enable slowquerylog and set thresholds to record slow query; 2. Use performance_schema to analyze query execution details, find out performance bottlenecks and optimize.

MySQL and SQL are essential skills for developers. 1.MySQL is an open source relational database management system, and SQL is the standard language used to manage and operate databases. 2.MySQL supports multiple storage engines through efficient data storage and retrieval functions, and SQL completes complex data operations through simple statements. 3. Examples of usage include basic queries and advanced queries, such as filtering and sorting by condition. 4. Common errors include syntax errors and performance issues, which can be optimized by checking SQL statements and using EXPLAIN commands. 5. Performance optimization techniques include using indexes, avoiding full table scanning, optimizing JOIN operations and improving code readability.

MySQL asynchronous master-slave replication enables data synchronization through binlog, improving read performance and high availability. 1) The master server record changes to binlog; 2) The slave server reads binlog through I/O threads; 3) The server SQL thread applies binlog to synchronize data.

MySQL is an open source relational database management system. 1) Create database and tables: Use the CREATEDATABASE and CREATETABLE commands. 2) Basic operations: INSERT, UPDATE, DELETE and SELECT. 3) Advanced operations: JOIN, subquery and transaction processing. 4) Debugging skills: Check syntax, data type and permissions. 5) Optimization suggestions: Use indexes, avoid SELECT* and use transactions.

The installation and basic operations of MySQL include: 1. Download and install MySQL, set the root user password; 2. Use SQL commands to create databases and tables, such as CREATEDATABASE and CREATETABLE; 3. Execute CRUD operations, use INSERT, SELECT, UPDATE, DELETE commands; 4. Create indexes and stored procedures to optimize performance and implement complex logic. With these steps, you can build and manage MySQL databases from scratch.

InnoDBBufferPool improves the performance of MySQL databases by loading data and index pages into memory. 1) The data page is loaded into the BufferPool to reduce disk I/O. 2) Dirty pages are marked and refreshed to disk regularly. 3) LRU algorithm management data page elimination. 4) The read-out mechanism loads the possible data pages in advance.

MySQL is suitable for beginners because it is simple to install, powerful and easy to manage data. 1. Simple installation and configuration, suitable for a variety of operating systems. 2. Support basic operations such as creating databases and tables, inserting, querying, updating and deleting data. 3. Provide advanced functions such as JOIN operations and subqueries. 4. Performance can be improved through indexing, query optimization and table partitioning. 5. Support backup, recovery and security measures to ensure data security and consistency.

Full table scanning may be faster in MySQL than using indexes. Specific cases include: 1) the data volume is small; 2) when the query returns a large amount of data; 3) when the index column is not highly selective; 4) when the complex query. By analyzing query plans, optimizing indexes, avoiding over-index and regularly maintaining tables, you can make the best choices in practical applications.


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