java实现http的Post、Get、代理访问请求
本文实例讲解了java实现http的Post、Get、代理访问请求的详细代码片段，分享给大家供大家参考，具体内容如下
packagecom.snowfigure.kits.net;
importjava.io.BufferedReader;
importjava.io.IOException;
importjava.io.InputStream;
importjava.io.InputStreamReader;
importjava.io.OutputStreamWriter;
importjava.io.UnsupportedEncodingException;
importjava.net.HttpURLConnection;
importjava.net.InetSocketAddress;
importjava.net.Proxy;
importjava.net.URL;
importjava.net.URLConnection;
importjava.util.List;
importjava.util.Map;
/**
*Http请求工具类
*@authorsnowfigure
*@since2014-8-2413:30:56
*@versionv1.0.1
*/
publicclassHttpRequestUtil{
staticbooleanproxySet=false;
staticStringproxyHost="127.0.0.1";
staticintproxyPort=8087;
/**
*编码
*@paramsource
*@return
*/
publicstaticStringurlEncode(Stringsource,Stringencode){
Stringresult=source;
try{
result=java.net.URLEncoder.encode(source,encode);
}catch(UnsupportedEncodingExceptione){
e.printStackTrace();
return"0";
}
returnresult;
}
publicstaticStringurlEncodeGBK(Stringsource){
Stringresult=source;
try{
result=java.net.URLEncoder.encode(source,"GBK");
}catch(UnsupportedEncodingExceptione){
e.printStackTrace();
return"0";
}
returnresult;
}
/**
*发起http请求获取返回结果
*@paramreq_url请求地址
*@return
*/
publicstaticStringhttpRequest(Stringreq_url){
StringBufferbuffer=newStringBuffer();
try{
URLurl=newURL(req_url);
HttpURLConnectionhttpUrlConn=(HttpURLConnection)url.openConnection();
httpUrlConn.setDoOutput(false);
httpUrlConn.setDoInput(true);
httpUrlConn.setUseCaches(false);
httpUrlConn.setRequestMethod("GET");
httpUrlConn.connect();
//将返回的输入流转换成字符串
InputStreaminputStream=httpUrlConn.getInputStream();
InputStreamReaderinputStreamReader=newInputStreamReader(inputStream,"utf-8");
BufferedReaderbufferedReader=newBufferedReader(inputStreamReader);
Stringstr=null;
while((str=bufferedReader.readLine())!=null){
buffer.append(str);
}
bufferedReader.close();
inputStreamReader.close();
//释放资源
inputStream.close();
inputStream=null;
httpUrlConn.disconnect();
}catch(Exceptione){
System.out.println(e.getStackTrace());
}
returnbuffer.toString();
}
/**
*发送http请求取得返回的输入流
*@paramrequestUrl请求地址
*@returnInputStream
*/
publicstaticInputStreamhttpRequestIO(StringrequestUrl){
InputStreaminputStream=null;
try{
URLurl=newURL(requestUrl);
HttpURLConnectionhttpUrlConn=(HttpURLConnection)url.openConnection();
httpUrlConn.setDoInput(true);
httpUrlConn.setRequestMethod("GET");
httpUrlConn.connect();
//获得返回的输入流
inputStream=httpUrlConn.getInputStream();
}catch(Exceptione){
e.printStackTrace();
}
returninputStream;
}
/**
*向指定URL发送GET方法的请求
*
*@paramurl
*发送请求的URL
*@paramparam
*请求参数，请求参数应该是name1=value1&name2=value2的形式。
*@returnURL所代表远程资源的响应结果
*/
publicstaticStringsendGet(Stringurl,Stringparam){
Stringresult="";
BufferedReaderin=null;
try{
StringurlNameString=url+"?"+param;
URLrealUrl=newURL(urlNameString);
//打开和URL之间的连接
URLConnectionconnection=realUrl.openConnection();
//设置通用的请求属性
connection.setRequestProperty("accept","*/*");
connection.setRequestProperty("connection","Keep-Alive");
connection.setRequestProperty("user-agent",
"Mozilla/4.0(compatible;MSIE6.0;WindowsNT5.1;SV1)");
//建立实际的连接
connection.connect();
//获取所有响应头字段
Map<String,List<String>>map=connection.getHeaderFields();
//遍历所有的响应头字段
for(Stringkey:map.keySet()){
System.out.println(key+"--->"+map.get(key));
}
//定义BufferedReader输入流来读取URL的响应
in=newBufferedReader(newInputStreamReader(
connection.getInputStream()));
Stringline;
while((line=in.readLine())!=null){
result+=line;
}
}catch(Exceptione){
System.out.println("发送GET请求出现异常！"+e);
e.printStackTrace();
}
//使用finally块来关闭输入流
finally{
try{
if(in!=null){
in.close();
}
}catch(Exceptione2){
e2.printStackTrace();
}
}
returnresult;
}
/**
*向指定URL发送POST方法的请求
*
*@paramurl
*发送请求的URL
*@paramparam
*请求参数，请求参数应该是name1=value1&name2=value2的形式。
*@paramisproxy
*是否使用代理模式
*@return所代表远程资源的响应结果
*/
publicstaticStringsendPost(Stringurl,Stringparam,booleanisproxy){
OutputStreamWriterout=null;
BufferedReaderin=null;
Stringresult="";
try{
URLrealUrl=newURL(url);
HttpURLConnectionconn=null;
if(isproxy){//使用代理模式
@SuppressWarnings("static-access")
Proxyproxy=newProxy(Proxy.Type.DIRECT.HTTP,newInetSocketAddress(proxyHost,proxyPort));
conn=(HttpURLConnection)realUrl.openConnection(proxy);
}else{
conn=(HttpURLConnection)realUrl.openConnection();
}
//打开和URL之间的连接
//发送POST请求必须设置如下两行
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setRequestMethod("POST");//POST方法
//设置通用的请求属性
conn.setRequestProperty("accept","*/*");
conn.setRequestProperty("connection","Keep-Alive");
conn.setRequestProperty("user-agent",
"Mozilla/4.0(compatible;MSIE6.0;WindowsNT5.1;SV1)");
conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
conn.connect();
//获取URLConnection对象对应的输出流
out=newOutputStreamWriter(conn.getOutputStream(),"UTF-8");
//发送请求参数
out.write(param);
//flush输出流的缓冲
out.flush();
//定义BufferedReader输入流来读取URL的响应
in=newBufferedReader(
newInputStreamReader(conn.getInputStream()));
Stringline;
while((line=in.readLine())!=null){
result+=line;
}
}catch(Exceptione){
System.out.println("发送POST请求出现异常！"+e);
e.printStackTrace();
}
//使用finally块来关闭输出流、输入流
finally{
try{
if(out!=null){
out.close();
}
if(in!=null){
in.close();
}
}
catch(IOExceptionex){
ex.printStackTrace();
}
}
returnresult;
}
publicstaticvoidmain(String[]args){
//demo:代理访问
Stringurl="http://api.adf.ly/api.php";
Stringpara="key=youkeyid&youuid=uid&advert_type=int&domain=adf.ly&url=http://somewebsite.com";
Stringsr=HttpRequestUtil.sendPost(url,para,true);
System.out.println(sr);
}
}
希望本文所述对大家学习java程序设计有所帮助。