appletrequest.java

java+mapxtreme 开发校园房管系统

package com.oyc.mapxtreme.applet.util;

import java.io.DataInputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;

/**
 * 负责Applet向服务器发送请求: doGet(),doPost()
 * @author 三峡大学理学院 欧阳超
 *
 */
public class AppletRequest {
	
	/**
	 * 发送get请求,并返回响应流的的字节数据
	 * @param url     请求的url
	 * 
	 * @return 响应流中读取的字节数组
	 * @throws IOException
	 */
	public byte[] sendGetRequest(String url) throws IOException {
		DataInputStream input = null;
		byte[] b = new byte[100000];
		try {
			URL server = new URL(url);
			URLConnection con = server.openConnection();
			input = new DataInputStream(con.getInputStream());
			//读出数据
			try {
				input.readFully(b);  //EOFException
			} catch (Exception e) {
			}
			
		} catch (IOException e) {
			System.out.println("发送get请求出错...");
			throw e;
		} finally {
			input.close();
		}
		return b;
	}
	
	/**
	 * 发送post请求,并返回响应流的的字节数据
	 * @param url       请求的url
	 * @param parameter 传入的参数,形如name=ouyang&sex=1.....
	 * 
	 * @return 响应流中读取的字节数组
	 * @throws IOException
	 */
	public byte[] sendPostRequest(String url, String parameter) throws IOException {
		//建立HTTP连接
		HttpURLConnection httpConn = null;
		PrintWriter out = null;
		try {
			URL server = new URL(url);
			httpConn = (HttpURLConnection) server.openConnection();
			httpConn.setDoOutput(true);
			httpConn.setDoInput(true);
			
			//发送参数
			out = new PrintWriter(httpConn.getOutputStream());
			out.print(parameter);
			
		} catch (IOException e) {
			System.out.println("发送post请求出错...");
			throw e;
		} finally {
			try {
				if(out != null){
					out.flush();
					out.close();
				}
			} catch (Exception e) {
			}
		}
		
		//读取响应流中的数据
		DataInputStream input = null;
		byte[] b = new byte[100000];
		try {
			input = new DataInputStream(httpConn.getInputStream());
			try {
				input.readFully(b);  //EOFException
			} catch (Exception e) {
			}
			
		} catch (IOException e) {
			System.out.println("发送post请求出错...");
			throw e;
		} finally {
			input.close();
		}
		
		return b;
	}

}