java短链接
① 如何干净的实现Android/java Socket 长连接通信
JavaSocket通信有很多的时候需要我们不断的学习。方面效率虽然不及C与C++但它以灵活语言优势，为大家广为使用。本文就对在使用java做通信方面程序时候应改注意问题做以说明。
1.长连接、短链接只是针对客户端而言，服务器无所谓长、短；
2.无论同步或者异步通信，发送之后务必要又响应回复，确认收到，负责进行一定范围内重发，例如重发三次；
3.长连接服务器与客户端之间务必需要心跳探测，由客户端主动发起；
4.短连接服务器通用代码：
python">packagecom.biesan.sms.gate.unioncom.communication;
importcom.biesan.commons.Constants;
importcom.biesan.commons.util.CodeUtil;
importcom.biesan.sms.gate.unioncom.data.*;
importcom.biesan.sms.gate.unioncom.util.GateInfo;
importjava.net.*;
importjava.io.*;
importjava.util.*;
importorg.apache.log4j.*;
importspApi.*;
{
//stopflag
privatebooleanunInterrupt=true;
privatebooleanunErr=true;
//privatebooleancloseSocketFlag=false;
//serversocket
privateServerSocketserverSo=null;
//currentsocket
privateSocketso=null
privateOutputStreamoutput=null;
privateInputStreaminput=null;
//gatecommand
privateSGIP_CommandtmpCmd=null;
privateSGIP_Commandcmd=null;
privateBindbind=null;
privateBindRespbindResp=null;
//privateUnbinnBind=null;
privateUnbindRespunBindResp=null;
=true;
LoggerunioncomLog=Logger.getLogger(Unioncom
Deliver.class.getName());
publicUnioncomDeliver(){
}
publicvoidrun(){
unioncomLog.info("Start...");
while(unInterrupt){
this.initServer();
this.startServices();
while(this.unAcceptErrorFlag){
try{
//接受连接请求
unioncomLog.info("beforeacceptconnection!.......
FreeMemroy:"+Runtime.getRuntime().freeMemory());
this.acceptConnection();
unioncomLog.info("afteracceptconnection!.......
FreeMemroy:"+Runtime.getRuntime().freeMemory());
while(unErr){
cmd=newCommand();
unioncomLog.info("beforereadcommandfromstream
...........FreeMemroy:"+Runtime.getRuntime().
freeMemory());
tmpCmd=cmd.read(input);
unioncomLog.info("afterreadcommandfromstream"+
getCommandString(cmd.getCommandID())+"FreeMemroy:"+
Runtime.getRuntime().freeMemory());
if(tmpCmd==null){
unErr=false;
break;
}
switch(cmd.getCommandID()){
//biadreadycommunication
caseSGIP_Command.ID_SGIP_BIND:{
this.dealBind();
break;
}//exitbind
caseSGIP_Command.ID_SGIP_UNBIND:{
this.dealUnBind();
unioncomLog.info("afterunbindconnection!.......
FreeMemroy:"+Runtime.getRuntime().freeMemory());
break;
}//deliver
....
default://错误的命令字
break;
}//switch
}//while(unErr)
}catch(Exceptione){
unioncomLog.error("UnioncomRecvServiceError"
+e.getMessage());
}finally{
if(this.so!=null){
this.closeSocket();
}
this.unErr=true;
}
}//while(this.unAcceptErrorFlag)
try{
this.closeServerSocket();
sleep(200);//sleep
}catch(InterruptedExceptionie){
}
}//while(unInterrupt)
}
privateStringgetCommandString(intcmd){
switch(cmd){
//biadreadycommunication
caseSGIP_Command.ID_SGIP_BIND:{
return"BINDCOMMAND";
}//exitbind
caseSGIP_Command.ID_SGIP_UNBIND:{
return"UNBINDCOMMAND";
}//deliver
case...
default:
return"UNKNOWNCOMMAND";
}
}
privatevoiddealBind(){
try{
bind=newBind(tmpCmd);
if(bind.readbody()!=0){
unioncomLog.warn("ReadBinderror");
this.unErr=false;
}
bindResp=newBindResp(tmpCmd.getMsgHead());
bindResp.SetResult(0);
bindResp.write(output);
unioncomLog.debug("Bindsuccess!");
}catch(Exceptione){
unioncomLog.error("DelaUnionRecvBindError!"+
e.getMessage());
this.unErr=false;
}
}
privatevoiddealUnBind(){
try{
//unBind=(Unbind)tmpCmd;
unBindResp=newUnbindResp(tmpCmd.getMsgHead());
unBindResp.write(output);
unioncomLog.debug("UnBindsuccess!");
}catch(Exceptione){
unioncomLog.warn("Unbinderror!"+e.getMessage());
}
this.unErr=false;
}
privatevoidstartServices(){
booleanunStartServices=true;
while(unStartServices){
try{
serverSo=newServerSocket(ugInfo.getLocalServerPort(),5,
InetAddress.getByName(ugInfo.getLocalIpAdd()));
//serverSo.setSoTimeout(60000);
unStartServices=false;
unioncomLog.info("CreateunionrecvsocketOk!");
}catch(IOExceptione){
unioncomLog.warn("Createunionrecvsocketerror!"
+e.getMessage());
unStartServices=true;
UnioncomSubmit.thrSlp(3000);
}
}
}
privatevoidacceptConnection(){
//Accept失败
try{
so=serverSo.accept();
so.setSoTimeout(10000);
}catch(Exceptione){
unioncomLog.warn("AcceptError!"+e.getMessage());
this.closeServerSocket();
this.unAcceptErrorFlag=false;
this.unErr=false;
}
//Accept成功
try{
input=so.getInputStream();
output=so.getOutputStream();
}catch(IOExceptione){
unioncomLog.warn("GetI/OstreamError!"+e.getMessage());
this.closeService();
this.unAcceptErrorFlag=false;
this.unErr=false;
}
}
privatevoidcloseSocket(){
try{
so.close();
unioncomLog.info("SocketCloseSuccess!!!");
}catch(Exceptione){
unioncomLog.error("SocketCloseFailure!!!"+e.getMessage());
}
}
privatevoidcloseServerSocket(){
try{
serverSo.close();
unioncomLog.info("ServerSocketCloseSuccess!!!");
}catch(Exceptione){
unioncomLog
.error("ServerSocketCloseFailure!!!"+e.getMessage());
}
}
privatevoidcloseService(){
this.closeSocket();
this.closeServerSocket();
}
privatevoidinitServer(){
this.bind=null;
this.bindResp=null;
//this.unBind=null;
this.unBindResp=null;
this.tmpCmd=null;
this.cmd=null;
this.serverSo=null;
this.so=null;
this.output=null;
this.input=null;
this.unErr=true;
//this.closeSocketFlag=false;
unioncomLog.info("Memory***==="
+java.lang.Runtime.getRuntime().freeMemory());
}
(){
this.unInterrupt=false;
unioncomLog.info("Requreinterrupt!!!");
}
(intmsgCoding,byte[]msgContent){
StringdeliverContent=null;
try{
if(msgContent!=null){
if(msgCoding==8){//处理ucs32编码
deliverContent=newString(msgContent,
"UnicodeBigUnmarked");
}elseif(msgCoding==0){//处理ASCII编码
deliverContent=newString(msgContent,"ASCII");
}elseif(msgCoding==4){//处理binary编码
deliverContent=newString(msgContent);
}elseif(msgCoding==15){//处理GBK编码
deliverContent=newString(msgContent,"GBK");
//处理DELIVER数据包的短信息ID
}else{
unioncomLog.error("编码格式错误!");
return"";
}
}else
return"";
returndeliverContent;
}catch(){
unioncomLog.error("dealcontenterror!"+
ex.getMessage());
return"";
}
}
}
② java socket 长连接 客户端
首先说长连接和短连接
短连接：在获得tcp连接之后发送数据，然后关闭连接
长连接：获得tcp连接之后，有数据则发送数据，无数据发送则定时发送数据包，保持连接状态.
长短只是相对的
你的需求应该在取得socket连接之后建立输入输出流，在输入流得到相应数据之后就可以关闭连接了
③ java调用百度api生成短链接，跪求java代码，不要复制网上的，要自己亲测实际能运行的！谢谢
package com..www;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
public class TestShort {
public static void main(String[] args) {
// TODO Auto-generated method stub
String httpUrl = "http://apis..com/3023/shorturl/shorten";
String httpArg = "url_long=http%3A%2F%2Fapistore..com%2Fastore%2Fshopready%2F1973.html";
String jsonResult = request(httpUrl, httpArg);
System.out.println(jsonResult);
}
/**
* @param urlAll
* :请求接口
* @param httpArg
* :参数
* @return 返回结果
*/
public static String request(String httpUrl, String httpArg) {
BufferedReader reader = null;
String result = null;
StringBuffer sbf = new StringBuffer();
httpUrl = httpUrl + "?" + httpArg;
try {
URL url = new URL(httpUrl);
HttpURLConnection connection = (HttpURLConnection) url
.openConnection();
connection.setRequestMethod("GET");
// 填入apikey到HTTP header
connection.setRequestProperty("apikey", "自己的apikey");
connection.connect();
InputStream is = connection.getInputStream();
reader = new BufferedReader(new InputStreamReader(is, "UTF-8"));
String strRead = null;
while ((strRead = reader.readLine()) != null) {
sbf.append(strRead);
sbf.append("\r\n");
}
reader.close();
result = sbf.toString();
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
}
这个可以用 不过要自己申请下api key 得到的字符串也要自己解析
④ java基础入门教程都有哪些
网上教程挺多的，刚刚看了一个九天的Java学习入门教程，通过《学生管理系统》案例整合基础知识，巩固加深知识理解。
学习内容：
第一阶段：Java基础语法
Java背景与环境搭建；常量、变量、数据类型；运算符；分支语句；循环语句；数组；方法；二维数组
第二阶段：面向对象基础
面向对象思想理解；类和对象的关系；对象的使用；对象内存图；this关键字；封装；构造方法；JavaBean类的编写
第三阶段：常用API
API手册的使用；String类的特点；不同方式创建String对象的区别；字符串常见面试题；字符串常用方法；StringBuilder类的使用；StringBuilder常用方法；String和StringBuilder的区别对比
第四阶段：集合框架
集合和数组的对比；ArrayList集合对象的使用；ArrayList集合对象常用方法；ArrayList集合遍历，与封装数据到集合；综合案例 - 学生管理系统
网页链接 912t