想知道某个类有的API,使用javap,想知道javadoc就不容易了。没有现成的话,就的有源码了。javap sun.net.ftp.FtpClient Compiled from "FtpClient.java" public class sun.net.ftp.FtpClient extends sun.net.TransferProtocolClient{ public static final int FTP_PORT; static int FTP_SUCCESS; static int FTP_TRY_AGAIN; static int FTP_ERROR; java.lang.String command; int lastReplyCode; public java.lang.String welcomeMsg; static final boolean $assertionsDisabled; public static boolean getUseFtpProxy(); public static java.lang.String getFtpProxyHost(); public static int getFtpProxyPort(); public static boolean matchNonProxyHosts(java.lang.String); public void closeServer() throws java.io.IOException; protected int issueCommand(java.lang.String) throws java.io.IOException; protected void issueCommandCheck(java.lang.String) throws java.io.IOException; protected int readReply() throws java.io.IOException; protected java.net.Socket openPassiveDataConnection() throws java.io.IOException; protected java.net.Socket openDataConnection(java.lang.String) throws java.io.IOException; public void openServer(java.lang.String) throws java.io.IOException; public void openServer(java.lang.String, int) throws java.io.IOException; public void login(java.lang.String, java.lang.String) throws java.io.IOException; public sun.net.TelnetInputStream get(java.lang.String) throws java.io.IOException; public sun.net.TelnetOutputStream put(java.lang.String) throws java.io.IOException; public sun.net.TelnetOutputStream append(java.lang.String) throws java.io.IOException; public sun.net.TelnetInputStream list() throws java.io.IOException; public sun.net.TelnetInputStream nameList(java.lang.String) throws java.io.IOException; public void cd(java.lang.String) throws java.io.IOException; public void cdUp() throws java.io.IOException; public java.lang.String pwd() throws java.io.IOException; public void binary() throws java.io.IOException; public void ascii() throws java.io.IOException; public void rename(java.lang.String, java.lang.String) throws java.io.IOException; public java.lang.String system() throws java.io.IOException; public void noop() throws java.io.IOException; public void reInit() throws java.io.IOException; public sun.net.ftp.FtpClient(java.lang.String) throws java.io.IOException; public sun.net.ftp.FtpClient(java.lang.String, int) throws java.io.IOException; public sun.net.ftp.FtpClient(); public sun.net.ftp.FtpClient(java.net.Proxy); protected void finalize() throws java.io.IOException; static java.net.Proxy access$000(sun.net.ftp.FtpClient); static {}; }
JRE 中以 sun 以及 com.sun 开头的包,是不建议直接在代码中直接使用的,因为这是 JRE 底层类库,可能在 Windows 平台上存在这个类,但是其他平台上就不一定会存在这个类。所以这些 JRE 底层的类库都是未文档化的,因此也就没有 API document
Compiled from "FtpClient.java"
public class sun.net.ftp.FtpClient extends sun.net.TransferProtocolClient{
public static final int FTP_PORT;
static int FTP_SUCCESS;
static int FTP_TRY_AGAIN;
static int FTP_ERROR;
java.lang.String command;
int lastReplyCode;
public java.lang.String welcomeMsg;
static final boolean $assertionsDisabled;
public static boolean getUseFtpProxy();
public static java.lang.String getFtpProxyHost();
public static int getFtpProxyPort();
public static boolean matchNonProxyHosts(java.lang.String);
public void closeServer() throws java.io.IOException;
protected int issueCommand(java.lang.String) throws java.io.IOException;
protected void issueCommandCheck(java.lang.String) throws java.io.IOException;
protected int readReply() throws java.io.IOException;
protected java.net.Socket openPassiveDataConnection() throws java.io.IOException;
protected java.net.Socket openDataConnection(java.lang.String) throws java.io.IOException;
public void openServer(java.lang.String) throws java.io.IOException;
public void openServer(java.lang.String, int) throws java.io.IOException;
public void login(java.lang.String, java.lang.String) throws java.io.IOException;
public sun.net.TelnetInputStream get(java.lang.String) throws java.io.IOException;
public sun.net.TelnetOutputStream put(java.lang.String) throws java.io.IOException;
public sun.net.TelnetOutputStream append(java.lang.String) throws java.io.IOException;
public sun.net.TelnetInputStream list() throws java.io.IOException;
public sun.net.TelnetInputStream nameList(java.lang.String) throws java.io.IOException;
public void cd(java.lang.String) throws java.io.IOException;
public void cdUp() throws java.io.IOException;
public java.lang.String pwd() throws java.io.IOException;
public void binary() throws java.io.IOException;
public void ascii() throws java.io.IOException;
public void rename(java.lang.String, java.lang.String) throws java.io.IOException;
public java.lang.String system() throws java.io.IOException;
public void noop() throws java.io.IOException;
public void reInit() throws java.io.IOException;
public sun.net.ftp.FtpClient(java.lang.String) throws java.io.IOException;
public sun.net.ftp.FtpClient(java.lang.String, int) throws java.io.IOException;
public sun.net.ftp.FtpClient();
public sun.net.ftp.FtpClient(java.net.Proxy);
protected void finalize() throws java.io.IOException;
static java.net.Proxy access$000(sun.net.ftp.FtpClient);
static {};
}
请问下用java不是跨平台的吗?怎么会出现这种问题,org.apache.commons.net.ftp.FTPClient是不会比较好点