HTTP请求：

如果需要Json格式的自己转下，度娘上N种姿势…

//处理http请求 requestUrl为请求地址 requestMethod请求方式，值为"GET"或"POST"

public static String httpRequest(String requestUrl,String requestMethod,String outputStr){

StringBuffer buffer=null;

try{

URL url=new URL(requestUrl);

HttpURLConnection conn=(HttpURLConnection)url.openConnection();

conn.setDoOutput(true);

conn.setDoInput(true);

conn.setRequestMethod(requestMethod);

conn.connect();

//往服务器端写内容 也就是发起http请求需要带的参数

if(null!=outputStr){

OutputStream os=conn.getOutputStream();

os.write(outputStr.getBytes("utf-8"));

os.close();

}

//读取服务器端返回的内容

InputStream is=conn.getInputStream();

InputStreamReader isr=new InputStreamReader(is,"utf-8");

BufferedReader br=new BufferedReader(isr);

buffer=new StringBuffer();

String line=null;

while((line=br.readLine())!=null){

buffer.append(line);

}

}catch(Exception e){

e.printStackTrace();

}

return buffer.toString();

}

HTTPS请求：

1、https和http的区别我这里就不介绍了，在java 中访问https链接的话需要有相应的SSL证书，如果没有就无法访问(使用http访问https会返回403)，所以我们要先自定义一个信任管理器。实现java自带的X509TrustManger接口，代码：

import java.security.cert.CertificateException;

import java.security.cert.X509Certificate;

import javax.net.ssl.X509TrustManager;

public class MyX509TrustManager implements X509TrustManager {

@Override

public void checkClientTrusted(X509Certificate[] chain, String authType)

throws CertificateException {

// TODO Auto-generated method stub

}

@Override

public void checkServerTrusted(X509Certificate[] chain, String authType)

throws CertificateException {

// TODO Auto-generated method stub

}

@Override

public X509Certificate[] getAcceptedIssuers() {

// TODO Auto-generated method stub

return null;

}

}

2、然后我们就可以使用https请求了：

/*

* 处理https GET/POST请求

* 请求地址、请求方法、参数

* */

public static String httpsRequest(String requestUrl,String requestMethod,String outputStr){

StringBuffer buffer=null;

try{

//创建SSLContext

SSLContext sslContext=SSLContext.getInstance("SSL");

TrustManager[] tm={new MyX509TrustManager()};

//初始化

sslContext.init(null, tm, new java.security.SecureRandom());;

//获取SSLSocketFactory对象

SSLSocketFactory ssf=sslContext.getSocketFactory();

URL url=new URL(requestUrl);

HttpsURLConnection conn=(HttpsURLConnection)url.openConnection();

conn.setDoOutput(true);

conn.setDoInput(true);

conn.setUseCaches(false);

conn.setRequestMethod(requestMethod);

//设置当前实例使用的SSLSoctetFactory

conn.setSSLSocketFactory(ssf);

conn.connect();

//往服务器端写内容

if(null!=outputStr){

OutputStream os=conn.getOutputStream();

os.write(outputStr.getBytes("utf-8"));

os.close();

}

//读取服务器端返回的内容

InputStream is=conn.getInputStream();

InputStreamReader isr=new InputStreamReader(is,"utf-8");

BufferedReader br=new BufferedReader(isr);

buffer=new StringBuffer();

String line=null;

while((line=br.readLine())!=null){

buffer.append(line);

}

}catch(Exception e){

e.printStackTrace();

}

return buffer.toString();

}

以上这篇java 发送http和https请求的实例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持脚本之家。