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本篇內容主要講解“Java Socket應答怎么實現”,感興趣的朋友不妨來看看。本文介紹的方法操作簡單快捷,實用性強。下面就讓小編來帶大家學習“Java Socket應答怎么實現”吧!
HTTP/1.1表示這個HTTP服務器是1.1版,200是服務器對客戶請求的應答狀態碼,OK是對應答狀態碼的解釋,之后是這個文檔的元信息和文檔正文。(相關應答狀態碼和元信息的解釋請參閱Inetrnet標準草案:RFC2616)。
Http.java import java.net.*; import java.io.*; import java.util.Properties; import java.util.Enumeration; public class Http { protected Socket client; protected BufferedOutputStream sender; protected BufferedInputStream receiver; protected ByteArrayInputStream byteStream; protected URL target; private int responseCode=-1; private String responseMessage=""; private String serverVersion=""; private Properties header = new Properties(); public Http() { } public Http(String url) { GET(url) ; } /* GET方法根據URL,會請求文件、數據庫查詢結果、程序運行結果等多種內容 */ public void GET(String url) { try { checkHTTP(url); openServer(target.getHost(),target.getPort() ); String cmd = "GET "+ getURLFormat(target) +" HTTP/1.0\r\n" + getBaseHeads()+"\r\n"; sendMessage(cmd); receiveMessage(); } catch(ProtocolException p) { p.printStackTrace(); return; } catch(UnknownHostException e) { e.printStackTrace(); return; } catch(IOException i) { i.printStackTrace(); return; } } /* * HEAD方法只請求URL的元信息,不包括URL本身。若懷疑本機和服務器上的 * 文件相同,用這個方法檢查最快捷有效。 */ public void HEAD(String url) { try { checkHTTP(url); openServer(target.getHost(),target.getPort() ); String cmd = "HEAD "+getURLFormat(target)+" HTTP/1.0\r\n" +getBaseHeads()+"\r\n"; sendMessage(cmd); receiveMessage(); }catch(ProtocolException p) { p.printStackTrace(); return; }catch(UnknownHostException e) { e.printStackTrace(); return; }catch(IOException i) { i.printStackTrace(); return; } } /* * POST方法是向服務器傳送數據,以便服務器做出相應的處理。例如網頁上常用的 * 提交表格。 */ public void POST(String url,String content) { try { checkHTTP(url); openServer(target.getHost(),target.getPort() ); String cmd = "POST "+ getURLFormat(target) +"HTTP/1.0\r\n"+getBaseHeads(); cmd += "Content-type: application/x-www-form-urlencoded\r\n"; cmd += "Content-length: " + content.length() + "\r\n\r\n"; cmd += content+"\r\n"; sendMessage(cmd); receiveMessage(); }catch(ProtocolException p) { p.printStackTrace(); return; }catch(UnknownHostException e) { e.printStackTrace(); return; }catch(IOException i) { i.printStackTrace(); return; } } protected void checkHTTP(String url) throws ProtocolException { try { URL target = new URL(url); if(target==null || !target.getProtocol().toUpperCase().equals("HTTP") ) throw new ProtocolException("這不是HTTP協議"); this.target = target; } catch(MalformedURLException m) { throw new ProtocolException("協議格式錯誤"); } } /* * 與Web服務器連接。若找不到Web服務器,InetAddress會引發UnknownHostException * 異常。若Socket連接失敗,會引發IOException異常。 */ protected void openServer(String host,int port) throws UnknownHostException,IOException { header.clear(); responseMessage=""; responseCode=-1; try { if(client!=null) closeServer(); if(byteStream != null) { byteStream.close(); byteStream=null; } InetAddress address = InetAddress.getByName(host); client = new Socket(address,port==-1?80:port); sender = new BufferedOutputStream(client.getOutputStream()); receiver = new BufferedInputStream(client.getInputStream()); }catch(UnknownHostException u) { throw u; }catch(IOException i) { throw i; } } /* 關閉與Web服務器的連接 */ protected void closeServer() throws IOException { if(client==null) return; try { client.close(); sender.close(); receiver.close(); } catch(IOException i) { throw i; } client=null; sender=null; receiver=null; } protected String getURLFormat(URL target) { String spec = "http:// +target.getHost(); if(target.getPort()!=-1) spec+=":"+target.getPort(); return spec+=target.getFile(); } /* 向Web服務器傳送數據 */ protected void sendMessage(String data) throws IOException{ sender.write(data.getBytes(),0,data.length()); sender.flush(); } /* 接收來自Web服務器的數據 */ protected void receiveMessage() throws IOException{ byte data[] = new byte[1024]; int count=0; int word=-1; // 解析***行 while( (word=receiver.read())!=-1 ) { if(word=='\r'||word=='\n') { word=receiver.read(); if(word=='\n') word=receiver.read(); break; } if(count == data.length) data = addCapacity(data); data[count++]=(byte)word; } String message = new String(data,0,count); int mark = message.indexOf(32); serverVersion = message.substring(0,mark); while( mark<message.length() && message.charAt(mark+1)==32 ) mark++; responseCode = Integer.parseInt(message.substring(mark+1,mark+=4)); responseMessage = message.substring(mark,message.length()).trim(); // 應答狀態碼和處理請讀者添加 switch(responseCode) { case 400: throw new IOException("錯誤請求"); case 404: throw new FileNotFoundException( getURLFormat(target) ); case 503: throw new IOException("服務器不可用" ); } if(word==-1) throw new ProtocolException("信息接收異常終止"); int symbol=-1; count=0; // 解析元信息 while( word!='\r' && word!='\n' && word>-1) { if(word=='\t') word=32; if(count==data.length) data = addCapacity(data); data[count++] = (byte)word; parseLine: { while( (symbol=receiver.read()) >-1 ) { switch(symbol) { case '\t': symbol=32; break; case '\r': case '\n': word = receiver.read(); if( symbol=='\r' && word=='\n') { word=receiver.read(); if(word=='\r') word=receiver.read(); } if( word=='\r' || word=='\n' || word>32) break parseLine; symbol=32; break; } if(count==data.length) data = addCapacity(data); data[count++] = (byte)symbol; } word=-1; } message = new String(data,0,count); mark = message.indexOf(':'); String key = null; if(mark>0) key = message.substring(0,mark); mark++; while( mark<message.length() && message.charAt(mark)<=32 ) mark++; String value = message.substring(mark,message.length() ); header.put(key,value); count=0; } // 獲得正文數據 while( (word=receiver.read())!=-1) { if(count == data.length) data = addCapacity(data); data[count++] = (byte)word; } if(count>0) byteStream = new ByteArrayInputStream(data,0,count); data=null; closeServer(); } public String getResponseMessage() { return responseMessage; } public int getResponseCode() { return responseCode; } public String getServerVersion() { return serverVersion; } public InputStream getInputStream() { return byteStream; } public synchronized String getHeaderKey(int i) { if(i>=header.size()) return null; Enumeration enum = header.propertyNames(); String key = null; for(int j=0; j<=i; j++) key = (String)enum.nextElement(); return key; } public synchronized String getHeaderValue(int i) { if(i>=header.size()) return null; return header.getProperty(getHeaderKey(i)); } public synchronized String getHeaderValue(String key) { return header.getProperty(key); } protected String getBaseHeads() { String inf = "User-Agent: myselfHttp/1.0\r\n"+ "Accept: www/source; text/html; image/gif; */*\r\n"; return inf; } private byte[] addCapacity(byte rece[]){ byte temp[] = new byte[rece.length+1024]; System.arraycopy(rece,0,temp,0,rece.length); return temp; } public static void main(String[] args) { Http http=new Http(); //http.GET("http://192.168.1.5 ); int i; for (i=0; i<50000; i++) { http.GET("http://www.model-dl.com/modelinfo.asp?modelid=101 ); http.POST("http://www.model-dl.com/modelinfo.asp?modelid=101,"ratecontd=101&MM_insert=form1 "); } } }
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