功能类似于java.net访问http服务器程序
2024-07-13 09:55:38
供稿：网友
本文来源于网页设计爱好者web开发社区http://www.html.org.cn收集整理，欢迎访问。package net.sonyhome.net;
import java.io.*;
import java.net.*;
import java.util.*;
import java.text.*;
/**
* 一个用来访问http服务器的东西。功能类似于java.net中的那个。但要强，这个对post方法的支持更好。
* 其实也不能说是我写的。不记得从哪儿找来的程序，稍事修改了一下。所以现在程序的结构都忘啦。
* 不过有一点是肯定的，那就是可以用。呵呵。
* 去年我做的java版的精华区就是用这个类来访问的。
* creation date: (2001-8-24 23:57:14)
* @author: sonymusic
*/
public class httpconnection {
private url url = null;
//private boolean doinput = true;
//private boolean dooutput = true;
private boolean usepost = false;
private boolean usecaches = false;
private vector reqheadernames = new vector();
private vector reqheadervalues = new vector();
private vector resheadernames = null;
private vector resheadervalues = null;
private socket socket = null;
private outputstream out = null;
private inputstream in = null;
private boolean usehttp11 = false;
private boolean connected = false;
private boolean inputstarted = false;
hashtable postdata = new hashtable();
hashtable getdata = new hashtable();
/**
* httpconnection constructor comment.
*/
public httpconnection(url url) {
super();
this.url = url;
}
/**
* insert the method's description here.
* creation date: (2001-8-25 1:16:52)
* @param name java.lang.string
* @param value java.lang.string
*/
public void addget(string name, string value) {
getdata.put(name, value);
}
/**
* insert the method's description here.
* creation date: (2001-8-25 1:16:52)
* @param name java.lang.string
* @param value java.lang.string
*/
public void addpost(string name, string value) {
postdata.put(name, value);
}
public void close() throws ioexception {
if (!connected)
return;
out.close();
if (inputstarted)
in.close();
socket.close();
}
public void connect() throws ioexception {
if (connected)
return;
if (!usecaches) {
setrequestproperty("pragma", "no-cache");
//setrequestproperty("cache-control", "no-cache, must-revalidate");
//setrequestproperty("expires", "mon, 26 jul 1997 05:00:00 gmt");
}
string protocol = url.getprotocol();
if (!protocol.equals("http"))
throw new unknownserviceexception("unknown protocol");
string host = url.gethost();
int port = url.getport();
if (port == -1)
port = 80;
string file = url.getfile();
socket = new socket(host, port);
out = socket.getoutputstream();
printstream pout = new printstream(out);
string method;
if (usepost) {
method = "post";
setrequestproperty("content-type", "application/x-www-form-urlencoded");
int len = getpostdatalength();
setrequestproperty("content-length", string.valueof(getpostdatalength()));
}
else
method = "get";
if (getgetdatalength() > 0) {
file += "?" + getgetdatastring();
}
pout.println(method + " " + file + " http/1.0");
for (int i = 0; i < reqheadernames.size(); ++i) {
string name = (string) reqheadernames.elementat(i);
string value = (string) reqheadervalues.elementat(i);
pout.println(name + ": " + value);
}
pout.println("");
if (usepost) {
string ttt = getpostdatastring();
pout.println(getpostdatastring());
}
pout.flush();
connected = true;
}
/**
* insert the method's description here.
* creation date: (2001-8-25 2:06:07)
* @return boolean
* @exception java.lang.illegalstateexception the exception description.
*/
public boolean contentistext() throws ioexception {
string type = getcontenttype();
if (type.startswith("text"))
return true;
return false;
}
/**
* insert the method's description here.
* creation date: (2001-8-25 2:20:31)
* @return byte[]
*/
public byte[] getbytearray() throws ioexception {
datainputstream din = new datainputstream(getinputstream());
byte[] ret;
byte[] b = new byte[1024];
int off = 0, len = 0;
bytearrayoutputstream bos = new bytearrayoutputstream();
while ((len = din.read(b, off, 1024)) > 0) {
bos.write(b, 0, len);
if (len < 1024)
break;
}
bos.flush();
bos.close();
return bos.tobytearray();
}
// gets the content length. returns -1 if not known.
public int getcontentlength() throws ioexception {
return getheaderfieldint("content-length", -1);
}
/// gets the content type. returns null if not known.
public string getcontenttype() throws ioexception {
return getheaderfield("content-type");
}
/**
* insert the method's description here.
* creation date: (2001-8-25 1:18:23)
* @return java.lang.string
*/
public int getgetdatalength() {
return getgetdatastring().length();
}
/**
* insert the method's description here.
* creation date: (2001-8-25 1:18:23)
* @return java.lang.string
*/
public string getgetdatastring() {
stringbuffer buf = new stringbuffer();
enumeration enu = getdata.keys();
while (enu.hasmoreelements()) {
string key = (string) (enu.nextelement());
string value = (string) (getdata.get(key));
if (buf.length() > 0)
buf.append("&");
buf.append(key);
buf.append("=");
buf.append(urlencoder.encode(value));
}
return buf.tostring();
}
public string getheaderfield(string name) throws ioexception {
if (resheadernames == null)
startinput();
int i = resheadernames.indexof(name.tolowercase());
if (i == -1)
return null;
return (string) resheadervalues.elementat(i);
}
public long getheaderfielddate(string name, long def) throws ioexception {
try {
return dateformat.getdateinstance().parse(getheaderfield(name)).gettime();
}
catch (parseexception e) {
throw new ioexception(e.tostring());
}
}
public int getheaderfieldint(string name, int def) throws ioexception {
try {
return integer.parseint(getheaderfield(name));
}
catch (numberformatexception t) {
return def;
}
}
/**
* insert the method's description here.
* creation date: (2001-8-25 1:12:09)
* @return java.util.enumeration
*/
public enumeration getheadernames() {
return resheadernames.elements();
}
public inputstream getinputstream() throws ioexception {
startinput();
return in;
}
public outputstream getoutputstream() throws ioexception {
connect();
return out;
}
/**
* insert the method's description here.
* creation date: (2001-8-25 1:18:23)
* @return java.lang.string
*/
public int getpostdatalength() {
return getpostdatastring().length();
}
/**
* insert the method's description here.
* creation date: (2001-8-25 1:18:23)
* @return java.lang.string
*/
public string getpostdatastring() {
stringbuffer buf = new stringbuffer();
enumeration enu = postdata.keys();
while (enu.hasmoreelements()) {
string key = (string) (enu.nextelement());
string value = (string) (postdata.get(key));
if (buf.length() > 0)
buf.append("&");
buf.append(key);
buf.append("=");
buf.append(urlencoder.encode(value));
}
return buf.tostring();
}
public string getrequestproperty(string name) {
if (connected)
throw new illegalaccesserror("already connected");
int i = reqheadernames.indexof(name);
if (i == -1)
return null;
return (string) reqheadervalues.elementat(i);
}
public url geturl() {
return url;
}
public boolean getusecaches() {
return usecaches;
}
public boolean getusehttp11() {
return usehttp11;
}
/**
* insert the method's description here.
* creation date: (2001-8-25 1:48:15)
* @return boolean
*/
public boolean isusepost() {
return usepost;
}
/**
* insert the method's description here.
* creation date: (2001-8-25 0:15:53)
* @param args java.lang.string[]
*/
public static void main(string[] args) {
try {
/*
url url=new url("http","192.168.0.3","/post.php");
httpconnection con=new httpconnection(url);
con.setusepost(true);
con.setusecaches(false);
//con.setrequestproperty("connection", "keep-alive");
con.addget("textfield","你好");
con.addget("submit", "submit");
con.connect();
//bytearrayoutputstream bos=con.getbytearray();
byte[] ret=con.getbytearray();
system.out.println(new string(ret));
system.out.println("");
enumeration enu=con.getheadernames();
while (enu.hasmoreelements()) {
string headername=(string)(enu.nextelement());
system.out.println(headername+": "+con.getheaderfield(headername));
}
con.close();
*/
url url = new url("http", "192.168.0.3", "/codemaker/images/bo.gif");
httpconnection con = new httpconnection(url);
con.connect();
fileoutputstream fos = new fileoutputstream("d://bo.gif");
fos.write(con.getbytearray());
fos.flush();
fos.close();
system.out.println("");
enumeration enu = con.getheadernames();
while (enu.hasmoreelements()) {
string headername = (string) (enu.nextelement());
system.out.println(headername + ": " + con.getheaderfield(headername));
}
con.close();
}
catch (exception e) {
e.printstacktrace();
}
}
/**
* insert the method's description here.
* creation date: (2001-8-25 1:16:52)
* @param name java.lang.string
* @param value java.lang.string
*/
public void removeget(string name) {
getdata.remove(name);
}
/**
* insert the method's description here.
* creation date: (2001-8-25 1:16:52)
* @param name java.lang.string
* @param value java.lang.string
*/
public void removepost(string name) {
postdata.remove(name);
}
public void setrequestproperty(string name, string value) {
if (connected)
throw new illegalaccesserror("already connected");
reqheadernames.addelement(name);
reqheadervalues.addelement(value);
}
public void setusecaches(boolean usecaches) {
if (connected)
throw new illegalaccesserror("already connected");
this.usecaches = usecaches;
}
public void setusehttp11(boolean usehttp11) {
if (connected)
throw new illegalaccesserror("already connected");
this.usehttp11 = usehttp11;
}
/**
* insert the method's description here.
* creation date: (2001-8-25 1:48:15)
* @param newusepost boolean
*/
public void setusepost(boolean newusepost) {
if (connected)
throw new illegalaccesserror("already connected");
usepost = newusepost;
}
private void startinput() throws ioexception {
connect();
if (inputstarted)
return;
in = socket.getinputstream();
resheadernames = new vector();
resheadervalues = new vector();
datainputstream din = new datainputstream(in);
string line;
// read and ignore the status line.
line = din.readline();
// read and save the header lines.
while (true) {
line = din.readline();
if (line == null || line.length() == 0)
break;
int colonblank = line.indexof(": ");
if (colonblank != -1) {
string name = line.substring(0, colonblank);
string value = line.substring(colonblank + 2);
resheadernames.addelement(name.tolowercase());
resheadervalues.addelement(value);
}
}
inputstarted = true;
}
/**
* returns a string that represents the value of this object.
* @return a string representation of the receiver
*/
public string tostring() {
// insert code to print the receiver here.
// this implementation forwards the message to super. you may replace or supplement this.
return this.getclass().getname() + ":" + url;
}
}
