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java发送请求,Java发送请求

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求教java程序怎么向网页服务器发送请求

POST方式发送请求示例: String fullurl = url; //打开连接 URLConnection conn =new URL(fullurl).openConnection(); //设置通用的请求属性 conn.setRequestProperty("accept", "*/*"); conn.setRequestProperty("connection", "Keep-Alive"); conn.setRequestProperty("user-agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.90 Safari/537.36"); //发送POST请求必须设置下面两行 conn.setDoInput(true); conn.setDoOutput(true); try ( //获取URLConnection对象对应的输出流 PrintWriter out = new PrintWriter(conn.getOutputStream());) { out.print(parm);//发送请求参数(key1=value1key2=value2) out.flush();//flush输出流的缓冲 } catch (Exception e) {} //获取响应头字段 MapString, ListString map = conn.getHeaderFields(); //根据输入流读取响应数据 InputStream is = conn.getInputStream();

Java发送get请求时设置ua

HttpClient方式发送请求或则以流的方式。

两种实现方式不同,怎么使用看个人喜好,不过在项目开发过程中,使用流的方式部署在预发机linux机器上会出现发送请求返回null的情况,但是本地windows却正常访问,而且,换另外一台预发机也能正常获取数据,目前还没有研究出个所以然,get是从服务器上获取数据,post是向服务器传送数据,get是把参数数据队列加到提交表单的ACTION属性所指的URL中,值和表单内各个字段一一对应,在URL中可以看到,post是通过HTTPpost机制,将表单内各个字段与其内容放置在HTML HEADER内一起传送到ACTION属性所指的URL地址。

如何使用java发送post请求

/**

* 向指定 URL 发送POST方法的请求

*

* @param url

* 发送请求的 URL

* @param param

* 请求参数,请求参数应该是 name1=value1name2=value2 的形式。

* @return 所代表远程资源的响应结果

*/

public static String sendPost(String url, String param) {

PrintWriter out = null;

BufferedReader in = null;

String result = "";

try {

URL realUrl = new URL(url);

// 打开和URL之间的连接

URLConnection conn = realUrl.openConnection();

// 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; MSIE 6.0; Windows NT 5.1;SV1)");

// 发送POST请求必须设置如下两行

conn.setDoOutput(true);

conn.setDoInput(true);

// 获取URLConnection对象对应的输出流

out = new PrintWriter(conn.getOutputStream());

// 发送请求参数

out.print(param);

// flush输出流的缓冲

out.flush();

// 定义BufferedReader输入流来读取URL的响应

in = new BufferedReader(

new InputStreamReader(conn.getInputStream()));

String line;

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

result += line;

}

} catch (Exception e) {

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(IOException ex){

ex.printStackTrace();

}

}

return result;

}

求解java怎样发送https请求

使用httpClient可以发送,具体的可以参考下面的代码

SSLClient类,继承至HttpClient

import java.security.cert.CertificateException;

import java.security.cert.X509Certificate;

import javax.net.ssl.SSLContext;

import javax.net.ssl.TrustManager;

import javax.net.ssl.X509TrustManager;

import org.apache.http.conn.ClientConnectionManager;

import org.apache.http.conn.scheme.Scheme;

import org.apache.http.conn.scheme.SchemeRegistry;

import org.apache.http.conn.ssl.SSLSocketFactory;

import org.apache.http.impl.client.DefaultHttpClient;

//用于进行Https请求的HttpClient

public class SSLClient extends DefaultHttpClient{

public SSLClient() throws Exception{

        super();

        SSLContext ctx = SSLContext.getInstance("TLS");

        X509TrustManager tm = new X509TrustManager() {

                @Override

                public void checkClientTrusted(X509Certificate[] chain,

                        String authType) throws CertificateException {

                }

                @Override

                public void checkServerTrusted(X509Certificate[] chain,

                        String authType) throws CertificateException {

                }

                @Override

                public X509Certificate[] getAcceptedIssuers() {

                    return null;

                }

        };

        ctx.init(null, new TrustManager[]{tm}, null);

        SSLSocketFactory ssf = new SSLSocketFactory(ctx,SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);

        ClientConnectionManager ccm = this.getConnectionManager();

        SchemeRegistry sr = ccm.getSchemeRegistry();

        sr.register(new Scheme("https", 443, ssf));

    }

}

HttpClient发送post请求的类

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import java.util.Map.Entry;

import org.apache.http.HttpEntity;

import org.apache.http.HttpResponse;

import org.apache.http.NameValuePair;

import org.apache.http.client.HttpClient;

import org.apache.http.client.entity.UrlEncodedFormEntity;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.message.BasicNameValuePair;

import org.apache.http.util.EntityUtils;

/*

 * 利用HttpClient进行post请求的工具类

 */

public class HttpClientUtil {

public String doPost(String url,MapString,String map,String charset){

HttpClient httpClient = null;

HttpPost httpPost = null;

String result = null;

try{

httpClient = new SSLClient();

httpPost = new HttpPost(url);

//设置参数

ListNameValuePair list = new ArrayListNameValuePair();

Iterator iterator = map.entrySet().iterator();

while(iterator.hasNext()){

EntryString,String elem = (EntryString, String) iterator.next();

list.add(new BasicNameValuePair(elem.getKey(),elem.getValue()));

}

if(list.size()  0){

UrlEncodedFormEntity entity = new UrlEncodedFormEntity(list,charset);

httpPost.setEntity(entity);

}

HttpResponse response = httpClient.execute(httpPost);

if(response != null){

HttpEntity resEntity = response.getEntity();

if(resEntity != null){

result = EntityUtils.toString(resEntity,charset);

}

}

}catch(Exception ex){

ex.printStackTrace();

}

return result;

}

}

测试代码

import java.util.HashMap;

import java.util.Map;

//对接口进行测试

public class TestMain {

private String url = "";

private String charset = "utf-8";

private HttpClientUtil httpClientUtil = null;

public TestMain(){

httpClientUtil = new HttpClientUtil();

}

public void test(){

String httpOrgCreateTest = url + "httpOrg/create";

MapString,String createMap = new HashMapString,String();

createMap.put("authuser","*****");

createMap.put("authpass","*****");

createMap.put("orgkey","****");

createMap.put("orgname","****");

String httpOrgCreateTestRtn = httpClientUtil.doPost(httpOrgCreateTest,createMap,charset);

System.out.println("result:"+httpOrgCreateTestRtn);

}

public static void main(String[] args){

TestMain main = new TestMain();

main.test();

}

}