JAVA发送HTTP请求的四种方式总结
源代码:http://github.com/lovewenyo/HttpDemo
1.HttpURLConnection
使用JDK原生提供的net,无需其他jar包;
HttpURLConnection是URLConnection的子类,提供更多的方法,使用更方便。
packagehttpURLConnection; importjava.io.BufferedReader; importjava.io.InputStream; importjava.io.InputStreamReader; importjava.net.HttpURLConnection; importjava.net.URL; publicclassHttpURLConnectionHelper{ publicstaticStringsendRequest(StringurlParam,StringrequestType){ HttpURLConnectioncon=null; BufferedReaderbuffer=null; StringBufferresultBuffer=null; try{ URLurl=newURL(urlParam); //得到连接对象 con=(HttpURLConnection)url.openConnection(); //设置请求类型 con.setRequestMethod(requestType); //设置请求需要返回的数据类型和字符集类型 con.setRequestProperty("Content-Type","application/json;charset=GBK"); //允许写出 con.setDoOutput(true); //允许读入 con.setDoInput(true); //不使用缓存 con.setUseCaches(false); //得到响应码 intresponseCode=con.getResponseCode(); if(responseCode==HttpURLConnection.HTTP_OK){ //得到响应流 InputStreaminputStream=con.getInputStream(); //将响应流转换成字符串 resultBuffer=newStringBuffer(); Stringline; buffer=newBufferedReader(newInputStreamReader(inputStream,"GBK")); while((line=buffer.readLine())!=null){ resultBuffer.append(line); } returnresultBuffer.toString(); } }catch(Exceptione){ e.printStackTrace(); } return""; } publicstaticvoidmain(String[]args){ Stringurl="http://int.dpool.sina.com.cn/iplookup/iplookup.php?ip=120.79.75.96"; System.out.println(sendRequest(url,"POST")); } }
2.URLConnection
使用JDK原生提供的net,无需其他jar包;
建议使用HttpURLConnection
packageuRLConnection; importjava.io.BufferedReader; importjava.io.InputStream; importjava.io.InputStreamReader; importjava.net.HttpURLConnection; importjava.net.URL; importjava.net.URLConnection; publicclassURLConnectionHelper{ publicstaticStringsendRequest(StringurlParam){ URLConnectioncon=null; BufferedReaderbuffer=null; StringBufferresultBuffer=null; try{ URLurl=newURL(urlParam); con=url.openConnection(); //设置请求需要返回的数据类型和字符集类型 con.setRequestProperty("Content-Type","application/json;charset=GBK"); //允许写出 con.setDoOutput(true); //允许读入 con.setDoInput(true); //不使用缓存 con.setUseCaches(false); //得到响应流 InputStreaminputStream=con.getInputStream(); //将响应流转换成字符串 resultBuffer=newStringBuffer(); Stringline; buffer=newBufferedReader(newInputStreamReader(inputStream,"GBK")); while((line=buffer.readLine())!=null){ resultBuffer.append(line); } returnresultBuffer.toString(); }catch(Exceptione){ e.printStackTrace(); } return""; } publicstaticvoidmain(String[]args){ Stringurl="http://int.dpool.sina.com.cn/iplookup/iplookup.php?ip=120.79.75.96"; System.out.println(sendRequest(url)); } }
3.HttpClient
使用方便,我个人偏爱这种方式,但依赖于第三方jar包,相关maven依赖如下:
commons-httpclient commons-httpclient 3.1 packagehttpClient; importjava.io.IOException; importorg.apache.commons.httpclient.HttpClient; importorg.apache.commons.httpclient.HttpException; importorg.apache.commons.httpclient.methods.GetMethod; importorg.apache.commons.httpclient.methods.PostMethod; importorg.apache.commons.httpclient.params.HttpMethodParams; publicclassHttpClientHelper{ publicstaticStringsendPost(StringurlParam)throwsHttpException,IOException{ //创建httpClient实例对象 HttpClienthttpClient=newHttpClient(); //设置httpClient连接主机服务器超时时间:15000毫秒 httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(15000); //创建post请求方法实例对象 PostMethodpostMethod=newPostMethod(urlParam); //设置post请求超时时间 postMethod.getParams().setParameter(HttpMethodParams.SO_TIMEOUT,60000); postMethod.addRequestHeader("Content-Type","application/json"); httpClient.executeMethod(postMethod); Stringresult=postMethod.getResponseBodyAsString(); postMethod.releaseConnection(); returnresult; } publicstaticStringsendGet(StringurlParam)throwsHttpException,IOException{ //创建httpClient实例对象 HttpClienthttpClient=newHttpClient(); //设置httpClient连接主机服务器超时时间:15000毫秒 httpClient.getHttpConnectionManager().getParams().setConnectionTimeout(15000); //创建GET请求方法实例对象 GetMethodgetMethod=newGetMethod(urlParam); //设置post请求超时时间 getMethod.getParams().setParameter(HttpMethodParams.SO_TIMEOUT,60000); getMethod.addRequestHeader("Content-Type","application/json"); httpClient.executeMethod(getMethod); Stringresult=getMethod.getResponseBodyAsString(); getMethod.releaseConnection(); returnresult; } publicstaticvoidmain(String[]args)throwsHttpException,IOException{ Stringurl="http://int.dpool.sina.com.cn/iplookup/iplookup.php?ip=120.79.75.96"; System.out.println(sendPost(url)); System.out.println(sendGet(url)); } }4.Socket
使用JDK原生提供的net,无需其他jar包;
使用起来有点麻烦。
packagesocket; importjava.io.BufferedInputStream; importjava.io.BufferedReader; importjava.io.BufferedWriter; importjava.io.IOException; importjava.io.InputStreamReader; importjava.io.OutputStreamWriter; importjava.net.Socket; importjava.net.URLEncoder; importjavax.net.ssl.SSLSocket; importjavax.net.ssl.SSLSocketFactory; publicclassSocketForHttpTest{ privateintport; privateStringhost; privateSocketsocket; privateBufferedReaderbufferedReader; privateBufferedWriterbufferedWriter; publicSocketForHttpTest(Stringhost,intport)throwsException{ this.host=host; this.port=port; /** *http协议 */ //socket=newSocket(this.host,this.port); /** *https协议 */ socket=(SSLSocket)((SSLSocketFactory)SSLSocketFactory.getDefault()).createSocket(this.host,this.port); } publicvoidsendGet()throwsIOException{ //StringrequestUrlPath="/z69183787/article/details/17580325"; StringrequestUrlPath="/"; OutputStreamWriterstreamWriter=newOutputStreamWriter(socket.getOutputStream()); bufferedWriter=newBufferedWriter(streamWriter); bufferedWriter.write("GET"+requestUrlPath+"HTTP/1.1\r\n"); bufferedWriter.write("Host:"+this.host+"\r\n"); bufferedWriter.write("\r\n"); bufferedWriter.flush(); BufferedInputStreamstreamReader=newBufferedInputStream(socket.getInputStream()); bufferedReader=newBufferedReader(newInputStreamReader(streamReader,"utf-8")); Stringline=null; while((line=bufferedReader.readLine())!=null){ System.out.println(line); } bufferedReader.close(); bufferedWriter.close(); socket.close(); } publicvoidsendPost()throwsIOException{ Stringpath="/"; Stringdata=URLEncoder.encode("name","utf-8")+"="+URLEncoder.encode("张三","utf-8")+"&"+ URLEncoder.encode("age","utf-8")+"="+URLEncoder.encode("32","utf-8"); //Stringdata="name=zhigang_jia"; System.out.println(">>>>>>>>>>>>>>>>>>>>>"+data); OutputStreamWriterstreamWriter=newOutputStreamWriter(socket.getOutputStream(),"utf-8"); bufferedWriter=newBufferedWriter(streamWriter); bufferedWriter.write("POST"+path+"HTTP/1.1\r\n"); bufferedWriter.write("Host:"+this.host+"\r\n"); bufferedWriter.write("Content-Length:"+data.length()+"\r\n"); bufferedWriter.write("Content-Type:application/x-www-form-urlencoded\r\n"); bufferedWriter.write("\r\n"); bufferedWriter.write(data); bufferedWriter.write("\r\n"); bufferedWriter.flush(); BufferedInputStreamstreamReader=newBufferedInputStream(socket.getInputStream()); bufferedReader=newBufferedReader(newInputStreamReader(streamReader,"utf-8")); Stringline=null; while((line=bufferedReader.readLine())!=null) { System.out.println(line); } bufferedReader.close(); bufferedWriter.close(); socket.close(); } publicstaticvoidmain(String[]args)throwsException{ /** *http协议测试 */ //SocketForHttpTestforHttpTest=newSocketForHttpTest("www.baidu.com",80); /** *https协议测试 */ SocketForHttpTestforHttpTest=newSocketForHttpTest("www.baidu.com",443); try{ forHttpTest.sendGet(); //forHttpTest.sendPost(); }catch(IOExceptione){ e.printStackTrace(); } } }总结
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