基于http协议的java客户端

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1.服务器端：使用TT存储数据，开启服务端：

cd /home/wlh/tt/tokyotyrant/bin/
./ttserver -host 127.0.0.1 -port 1998 -ulog ulog-1 -sid 1 casket.tch

2.基于http协议的客户端实现代码：

package com.tt.client;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;

public class HttpClientTest {
	//服务端主机地址
	public static final String TTSERVER_HOST = "http://10.236.0.12";
	//服务端端口号
	public static final int TTSERVER_PORT = 1998;
	/**
         * @date 2011.12.26
         * @Administrator wanglihu
	 * @throws IOException 
	 */
	public static void main(String[] args) throws IOException {
		HttpRequest hq = new HttpRequest();
                //存储数据，发送put请求
		String msg = hq.put("test_key", "test_value", 0, TTSERVER_HOST, TTSERVER_PORT);
		System.out.println(msg);//test_valueCreated
		msg = hq.put("test_key","test_value1", 0,TTSERVER_HOST, TTSERVER_PORT);
		System.out.println(msg);//Exception in thread "main" java.io.FileNotFoundException: http://10.236.0.12:1998/test_key
                //通过key值获得value数据
		msg = hq.get("test_key", TTSERVER_HOST, TTSERVER_PORT);
		System.out.println(msg);//test_value
		msg = hq.options(TTSERVER_HOST, TTSERVER_PORT);
		System.out.println(msg);//空值
		msg = hq.head("test_key", TTSERVER_HOST, TTSERVER_PORT);
		System.out.println(msg);//空值
		msg = hq.delete("test_key", TTSERVER_HOST, TTSERVER_PORT);
		System.out.println(msg);//OK
		msg = hq.get("test_key", TTSERVER_HOST, TTSERVER_PORT);
		System.out.println(msg);//Exception in thread "main" java.io.FileNotFoundException: http://10.236.0.12:1998/test_key
	}

}
final class HttpRequest{
	public final String put(String key,String value,int flag,String host,int port) throws IOException{
		if(flag < 0 || flag > 2){
			flag = 0;
		}
		URL url = new URL(host + ":" + port + "/" +key);
		HttpURLConnection connection = (HttpURLConnection) url.openConnection();
		connection.setDoInput(true);
		connection.setDoOutput(true);
		
		connection.setRequestMethod("PUT");//总共有其中方法：GET,POST,HEAD,OPTIONS,PUT,DELETE,TRACE,CONNECT
		connection.setRequestProperty("HOST", host + ":" +port);//设置主机和端口号
		connection.setRequestProperty("ACCEPT", "*/*");//设置可以接受的媒体（头部）
		//PUT有header"X-TT-PDMODE"，值可以是1（同'tcrdbputkeep'）,2(同'tcrdbputcat'),3(同'tcrdbput')
		//POST可以有header"X-TT-XNAME"或者"X-TT-MNAME"中的一个.
		//X-TT-XNAME等同于"tcrdbext"，用于指定函数名，header"X-TT-XOPTS"用于bitwise-or选项，1（记录锁）和2（全局锁），
		//每个请的URI将被作为URL编码过的key对待,而实体内容被作为value,结果表示在应答的实体正文中。
		//header"X-TT-MOPTS"用于bitwise-or选项,1(忽略更新日志)，请求参数用"application/x-www-form-urlencoded"格式表示在实体正文中，
		//名字被忽略而值被作为参数列表。结果在应答的实体正文中用"application/x-www.form-url-urlencoded"格式表示
		//PUT有header"X-TT-PDMODE"，值可以是1（同'tcrdbputkeep'）,2(同'tcrdbputcat'),3(同'tcrdbput')
		connection.setRequestProperty("X-TT-PDMODE:", " 2 ");
		//设置连接主机超市（单位：毫秒）
		connection.setConnectTimeout(30000);
		//设置从主机读取数据超时（单位：毫秒）
		connection.setReadTimeout(30000);
		
		connection.connect();
		OutputStream outputStream = connection.getOutputStream();
		//通过输出流对象构建对象输入流，以实现输出可序列化的对象
		BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(outputStream));
		//想对象输出流写出数据，这些数据将存到内存缓冲区中
		bw.write(value);
		//刷新对象输出流，将任何字节都写入潜在的流中
		bw.flush();
		//关闭对象流，此时，不能再想对象输出流中写入任何数据，先前写入的数据存在于内存缓冲区中
		//在调用下面的getInputStream()函数时才把准备好的http请求正是发送到服务器
		bw.close();
		//connection.getInputStream()，将内存缓冲区中封装好的完整的HTTP请求电文发送到服务端
		BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));//注意，实际发送请求的代码段就在这里
		//上面的connection.getInputStream()方法已调用，本次http请求结束，下边向对象输出流的输出已无意义。
		//即使对象输出流没有调用close()方法，下面的操作也不会向对象输出流写入任何数据。
		//因此，要重新发送数据时需要重新创建连接、重新设参数、重新创建流对象、重新写数据，重新发送数据
		StringBuffer buffer = new StringBuffer(100);
		buffer.append(value);
		String line = null;
		if(br == null){
			System.out.println("result is null!");
		}
		while((line = br.readLine()) != null){
			buffer.append(line);
			buffer.append("\r\n");
		}
		br.close();
		return buffer.toString();
	}
	public final String get(String key , String host,int port) throws IOException{
		URL url = new URL(host + ":" + port + "/" +key);
		//HttpURLConnection对象实际上是根据URL的请求协议(此处是http)生成的URLConnection类的子类HttpURLConnection，
		//故此处最好将其转化为HttpURLConnection类型的对象，以便用到HttpURLConnection更多的API
		HttpURLConnection connection = (HttpURLConnection) url.openConnection();
		//设置是否向HttpURLConnection读入，默认情况下是false
		connection.setDoInput(true);
		//对象参数1:设置是否向HttpURLConnection输出，因为这个是post请求，参数要放在http正文内，因此需要设为true,默认情况下是false
		connection.setDoOutput(true);
		//请求不能使用缓存
		connection.setUseCaches(false);
		//设定传送的内容类型是可序列化的java对象（如果不设此项，在传送序列化对象时，当Web服务默认的不是这种类型时可能抛出java.io.EOFException）
		connection.setRequestProperty("Content-type", "application/x-java-serialized-object");
		//设置请求的方法是"GET",默认就是GET
		connection.setRequestMethod("GET");
		
		connection.setRequestProperty("HOST", host + ":" +port);
		connection.setRequestProperty("ACCEPT", "*/*");
		//上面的配置信息必须在connect之前完成
		connection.connect();
		
		//此处的getInputStream会隐含的进行connect（即：如同调用上面的connect()方法，所以在开发中不调用上述connect()也可以）
		//通过输入流对象构建对象输入流，以实现输入可序列化的对象
		BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));
		StringBuffer buffer = new StringBuffer(100);
		String line = null;
		if(br == null){
			System.out.println("result is null!");
		}
		while((line = br.readLine()) != null){
			buffer.append(line);
			buffer.append("\r\n");
		}
		br.close();
		return buffer.toString();
	}
	public final String delete(String key,String host,int port)throws IOException{
		URL url = new URL(host + ":" + port + "/" +key);
		HttpURLConnection connection = (HttpURLConnection) url.openConnection();
		connection.setDoInput(true);
		connection.setDoOutput(true);
		connection.setRequestMethod("DELETE");
		connection.setRequestProperty("HOST", host + ":" +port);
		connection.setRequestProperty("ACCEPT", "*/*");
		connection.connect();
		BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));
		StringBuffer buffer = new StringBuffer(100);
		String line = null;
		if(br == null){
			System.out.println("result is null!");
		}
		while((line = br.readLine()) != null){
			buffer.append(line);
			buffer.append("\r\n");
		}
		br.close();
		return buffer.toString();
		
	}
	public final String options(String host,int port)throws IOException{
		URL url = new URL(host + ":" + port + "/");
		HttpURLConnection connection = (HttpURLConnection) url.openConnection();
		connection.setDoInput(true);
		connection.setDoOutput(true);
		connection.setRequestMethod("OPTIONS");
		connection.setRequestProperty("HOST", host + ":" +port);
		connection.setRequestProperty("ACCEPT", "*/*");
		connection.connect();
		BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));
		StringBuffer buffer = new StringBuffer(100);
		String line = null;
		if(br == null){
			System.out.println("result is null!");
		}
		while((line = br.readLine()) != null){
			buffer.append(line);
			buffer.append("\r\n");
		}
		br.close();
		return buffer.toString();
	}
	public final String head(String key,String host,int port)throws IOException{
		URL url = new URL(host + ":" + port + "/" + key);
		HttpURLConnection connection = (HttpURLConnection) url.openConnection();
		connection.setDoInput(true);
		connection.setDoOutput(true);
		connection.setRequestMethod("OPTIONS");
		connection.setRequestProperty("HOST", host + ":" +port);
		connection.setRequestProperty("ACCEPT", "*/*");
		connection.connect();
		BufferedReader br = new BufferedReader(new InputStreamReader(connection.getInputStream()));
		StringBuffer buffer = new StringBuffer(100);
		String line = null;
		if(br == null){
			System.out.println("result is null!");
		}
		while((line = br.readLine()) != null){
			buffer.append(line);
			buffer.append("\r\n");
		}
		br.close();
		return buffer.toString();
	}
}