因工作需要,需要在后台处理一些小文件,比如网页资源到服务器上保存,本来计划使用DFS来进行压缩存储,考虑到需要再次解压生成访问连接,暂时先直接通过FTP直接保存在服务器上。就看了下Java下的ftp上传的实现方法,参照了网上的代码。
这里给出我封装的一个工具类,可以直接使用,应该需要再优化。
使用了Apache的commons-net-1.4.1.jar开源组件。
对应的API地址如下:
http://commons.apache.org/proper/commons-net/apidocs/org/apache/commons/net/ftp/FTPClient.html
package com.test;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;
/**
* FTP工具类
* @author dq
*/
public class FtpUtils {
private FTPClient ftpClient = null;
private String server;
private int port;
private String userName;
private String userPassword;
public FtpUtils(String server, int port, String userName, String userPassword) {
this.server = server;
this.port = port;
this.userName = userName;
this.userPassword = userPassword;
}
/**
* 连接服务器
* @return 连接成功与否 true:成功, false:失败
*/
public boolean open() {
if (ftpClient != null && ftpClient.isConnected()) {
return true;
}
try {
ftpClient = new FTPClient();
// 连接
ftpClient.connect(this.server, this.port);
ftpClient.login(this.userName, this.userPassword);
setFtpClient(ftpClient);
// 检测连接是否成功
int reply = ftpClient.getReplyCode();
if (!FTPReply.isPositiveCompletion(reply)) {
this.close();
System.err.println("FTP server refused connection.");
System.exit(1);
}
System.out.println("open FTP success:" + this.server + ";port:" + this.port + ";name:" + this.userName
+ ";pwd:" + this.userPassword);
ftpClient.setFileType(FTP.BINARY_FILE_TYPE); // 设置上传模式.binally or ascii
return true;
} catch (Exception ex) {
this.close();
ex.printStackTrace();
return false;
}
}
/**
* 切换到父目录
* @return 切换结果 true:成功, false:失败
*/
private boolean changeToParentDir() {
try {
return ftpClient.changeToParentDirectory();
} catch (IOException e) {
e.printStackTrace();
return false;
}
}
/**
* 改变当前目录到指定目录
* @param dir 目的目录
* @return 切换结果 true:成功,false:失败
*/
private boolean cd(String dir) {
try {
return ftpClient.changeWorkingDirectory(dir);
} catch (IOException e) {
e.printStackTrace();
return false;
}
}
/**
* 获取目录下所有的文件名称
*
* @param filePath 指定的目录
* @return 文件列表,或者null
*/
private FTPFile[] getFileList(String filePath) {
try {
return ftpClient.listFiles(filePath);
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
/**
* 层层切换工作目录
* @param ftpPath 目的目录
* @return 切换结果
*/
public boolean changeDir(String ftpPath) {
if (!ftpClient.isConnected()) {
return false;
}
try {
// 将路径中的斜杠统一
char[] chars = ftpPath.toCharArray();
StringBuffer sbStr = new StringBuffer(256);
for (int i = 0; i < chars.length; i++) {
if ('\\' == chars[i]) {
sbStr.append('/');
} else {
sbStr.append(chars[i]);
}
}
ftpPath = sbStr.toString();
if (ftpPath.indexOf('/') == -1) {
// 只有一层目录
ftpClient.changeWorkingDirectory(new String(ftpPath.getBytes(), "iso-8859-1"));
} else {
// 多层目录循环创建
String[] paths = ftpPath.split("/");
for (int i = 0; i < paths.length; i++) {
ftpClient.changeWorkingDirectory(new String(paths[i].getBytes(), "iso-8859-1"));
}
}
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
/**
* 循环创建目录,并且创建完目录后,设置工作目录为当前创建的目录下
* @param ftpPath 需要创建的目录
* @return
*/
public boolean mkDir(String ftpPath) {
if (!ftpClient.isConnected()) {
return false;
}
try {
// 将路径中的斜杠统一
char[] chars = ftpPath.toCharArray();
StringBuffer sbStr = new StringBuffer(256);
for (int i = 0; i < chars.length; i++) {
if ('\\' == chars[i]) {
sbStr.append('/');
} else {
sbStr.append(chars[i]);
}
}
ftpPath = sbStr.toString();
System.out.println("ftpPath:" + ftpPath);
if (ftpPath.indexOf('/') == -1) {
// 只有一层目录
ftpClient.makeDirectory(new String(ftpPath.getBytes(), "iso-8859-1"));
ftpClient.changeWorkingDirectory(new String(ftpPath.getBytes(), "iso-8859-1"));
} else {
// 多层目录循环创建
String[] paths = ftpPath.split("/");
for (int i = 0; i < paths.length; i++) {
ftpClient.makeDirectory(new String(paths[i].getBytes(), "iso-8859-1"));
ftpClient.changeWorkingDirectory(new String(paths[i].getBytes(), "iso-8859-1"));
}
}
return true;
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
/**
* 上传文件到FTP服务器
* @param localDirectoryAndFileName 本地文件目录和文件名
* @param ftpFileName 上传到服务器的文件名
* @param ftpDirectory FTP目录如:/path1/pathb2/,如果目录不存在会自动创建目录
* @return
*/
public boolean upload(String localDirectoryAndFileName, String ftpFileName, String ftpDirectory) {
if (!ftpClient.isConnected()) {
return false;
}
boolean flag = false;
if (ftpClient != null) {
File srcFile = new File(localDirectoryAndFileName);
FileInputStream fis = null;
try {
fis = new FileInputStream(srcFile);
// 创建目录
this.mkDir(ftpDirectory);
ftpClient.setBufferSize(100000);
ftpClient.setControlEncoding("UTF-8");
// 设置文件类型(二进制)
ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
// 上传
flag = ftpClient.storeFile(new String(ftpFileName.getBytes(), "iso-8859-1"), fis);
} catch (Exception e) {
this.close();
e.printStackTrace();
return false;
} finally {
try {
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
System.out.println("上传文件成功,本地文件名: " + localDirectoryAndFileName + ",上传到目录:" + ftpDirectory + "/" + ftpFileName);
return flag;
}
/**
* 从FTP服务器上下载文件
* @param ftpDirectoryAndFileName ftp服务器文件路径,以/dir形式开始
* @param localDirectoryAndFileName 保存到本地的目录
* @return
*/
public boolean get(String ftpDirectoryAndFileName, String localDirectoryAndFileName) {
if (!ftpClient.isConnected()) {
return false;
}
ftpClient.enterLocalPassiveMode(); // Use passive mode as default
try {
// 将路径中的斜杠统一
char[] chars = ftpDirectoryAndFileName.toCharArray();
StringBuffer sbStr = new StringBuffer(256);
for (int i = 0; i < chars.length; i++) {
if ('\\' == chars[i]) {
sbStr.append('/');
} else {
sbStr.append(chars[i]);
}
}
ftpDirectoryAndFileName = sbStr.toString();
String filePath = ftpDirectoryAndFileName.substring(0, ftpDirectoryAndFileName.lastIndexOf("/"));
String fileName = ftpDirectoryAndFileName.substring(ftpDirectoryAndFileName.lastIndexOf("/") + 1);
this.changeDir(filePath);
ftpClient.retrieveFile(new String(fileName.getBytes(), "iso-8859-1"),
new FileOutputStream(localDirectoryAndFileName)); // download
// file
System.out.println(ftpClient.getReplyString()); // check result
System.out.println("从ftp服务器上下载文件:" + ftpDirectoryAndFileName + ", 保存到:" + localDirectoryAndFileName);
return true;
} catch (IOException e) {
e.printStackTrace();
return false;
}
}
/**
* 返回FTP目录下的文件列表
* @param pathName
* @return
*/
public String[] getFileNameList(String pathName) {
try {
return ftpClient.listNames(pathName);
} catch (IOException e) {
e.printStackTrace();
return null;
}
}
/**
* 删除FTP上的文件
* @param ftpDirAndFileName 路径开头不能加/,比如应该是test/filename1
* @return
*/
public boolean deleteFile(String ftpDirAndFileName) {
if (!ftpClient.isConnected()) {
return false;
}
try {
return ftpClient.deleteFile(ftpDirAndFileName);
} catch (IOException e) {
e.printStackTrace();
return false;
}
}
/**
* 删除FTP目录
* @param ftpDirectory
* @return
*/
public boolean deleteDirectory(String ftpDirectory) {
if (!ftpClient.isConnected()) {
return false;
}
try {
return ftpClient.removeDirectory(ftpDirectory);
} catch (IOException e) {
e.printStackTrace();
return false;
}
}
/**
* 关闭链接
*/
public void close() {
try {
if (ftpClient != null && ftpClient.isConnected()) {
ftpClient.disconnect();
}
System.out.println("成功关闭连接,服务器ip:" + this.server + ", 端口:" + this.port);
} catch (Exception e) {
e.printStackTrace();
}
}
public FTPClient getFtpClient() {
return ftpClient;
}
public void setFtpClient(FTPClient ftpClient) {
this.ftpClient = ftpClient;
}
public static void main(String[] args) {
FtpUtils f = new FtpUtils("192.168.162.100", 21, "uftp", "admin");
try {
if(f.open()) {
String fileName = "测试2.txt";
//上传
f.upload("d:/1.txt", fileName, "test1");
//遍历
FTPFile[] list = f.getFileList("test1");
for(FTPFile file : list) {
String name = file.getName();
System.out.println("--" + new String(name.getBytes("iso-8859-1"), "GB2312"));
}
//只遍历指定目录下的文件名
String[] names = f.getFileNameList("test1");
for(String name : names) {
System.out.println(new String(name.getBytes("iso-8859-1"), "GB2312"));
}
//下载
boolean b = f.get("/test1/测试2.txt", "d:/text.txt");
System.out.println(b);
//删除
String ftpDirAndFileName = "test1/测试.txt";
boolean be = f.deleteFile(new String(ftpDirAndFileName.getBytes(), "iso-8859-1"));
System.out.println(be);
//删除目录
boolean delf = f.deleteDirectory("test1");
System.out.println(delf);
f.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
代码不难理解,main方法中给出了使用的方式,就当做是记录一下了。