package cn.jeesoft.core.util;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.URL;
import java.net.URLConnection;
import org.apache.commons.lang.StringUtils;
public class HttpUtil {
private static final String default_charset = "utf-8";
public static String get(String url0,String data,String charset) throws IOException {
if(StringUtils.isBlank(charset)){
charset = default_charset;
}
/**
* 首先要和URL下的URLConnection对话。 URLConnection可以很容易的从URL得到。比如: // Using
* java.net.URL and //java.net.URLConnection
*/
URL url = new URL(url0);
URLConnection conn = url.openConnection();
/**
* 然后把连接设为输出模式。URLConnection通常作为输入来使用,比如下载一个Web页。
* 通过把URLConnection设为输出,你可以把数据向你个Web页传送。下面是如何做:
*/
conn.setDoOutput(true);
//当存在post的值时,才打开OutputStreamWriter
if(data!=null && data.toString().trim().length()>0){
/**
* 最后,为了得到OutputStream,简单起见,把它约束在Writer并且放入POST信息中,例如: ...
*/
OutputStreamWriter out = new OutputStreamWriter(conn.getOutputStream(),charset);
out.write("username=kevin&password=*********"); // post的关键所在!
// remember to clean up
out.flush();
out.close();
}
/**
* 这样就可以发送一个看起来象这样的POST: POST /jobsearch/jobsearch.cgi HTTP 1.0 ACCEPT:
* text/plain Content-type: application/x-www-form-urlencoded
* Content-length: 99 username=bob password=someword
*/
// 一旦发送成功,用以下方法就可以得到服务器的回应:
String sCurrentLine = null;
StringBuilder buff = new StringBuilder();
BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream(),charset));
while ((sCurrentLine = reader.readLine()) != null) {
// buff.append(new String(sCurrentLine.getBytes(), charset));
System.out.println("sCurrentLine="+sCurrentLine);
buff.append(sCurrentLine);
}
return buff.toString();
}
public static void main(String[] args) throws IOException {
System.out.println(HttpUtil.get("http://www.baidu.com",null,"gbk"));
}
}