java发送http的get、post请求

import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
 
import org.json.JSONArray;
import org.json.JSONObject;
 
public class GetJsonData {
 
    public static String getJsonData(JSONObject jsonParam,String urls) {
        StringBuffer sb=new StringBuffer();
        try {
            ;
            // 创建url资源
            URL url = new URL(urls);
            // 建立http连接
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            // 设置允许输出
            conn.setDoOutput(true);
                        // 设置允许输入
                        conn.setDoInput(true);
                       // 设置不用缓存
                       conn.setUseCaches(false);
                       // 设置传递方式
                       conn.setRequestMethod("POST");
                       // 设置维持长连接
                        conn.setRequestProperty("Connection", "Keep-Alive");
                       // 设置文件字符集:
                       conn.setRequestProperty("Charset", "UTF-8");
                       // 转换为字节数组
                       byte[] data = (jsonParam.toString()).getBytes();
                      // 设置文件长度
                       conn.setRequestProperty("Content-Length", String.valueOf(data.length));
                      // 设置文件类型:
                      conn.setRequestProperty("contentType", "application/json");
                        // 开始连接请求
                       conn.connect();        
                    OutputStream out = new DataOutputStream(conn.getOutputStream()) ;
            // 写入请求的字符串
            out.write((jsonParam.toString()).getBytes());
            out.flush();
            out.close();
 
            System.out.println(conn.getResponseCode());
            
            // 请求返回的状态
            if (HttpURLConnection.HTTP_OK == conn.getResponseCode(){
                System.out.println("连接成功");
                // 请求返回的数据
                InputStream in1 = conn.getInputStream();
                try {
                      String readLine=new String();
                      BufferedReader responseReader=new BufferedReader(new InputStreamReader(in1,"UTF-8"));
                      while((readLine=responseReader.readLine())!=null){
                        sb.append(readLine).append("
");
                      }
                      responseReader.close();
                      System.out.println(sb.toString());
                    
                } catch (Exception e1) {
                    e1.printStackTrace();
                }
            } else {
                System.out.println("error++");
                
            }
 
        } catch (Exception e) {
 
        }
        
        return sb.toString();
 
    }
    public static void main(String[] args) {
        JSONObject jsonParam = new JSONObject();
        jsonParam.put("id", "1401_1406");
        jsonParam.put("device_size", "480x720");
        String url="www.baidu.com";
        String data=GetJsonData.getJsonData(jsonParam,url);
                //返回的是一个[{}]格式的字符串时:                               
                JSONArray jsonArray = new JSONArray(data);                       
               //返回的是一个{}格式的字符串时:                       
               /*JSONObject obj= new JSONObject(data);*/      
    }
} 

package wzh.Http;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;

public class HttpRequest {
    /**
     * 向指定URL发送GET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=value1&name2=value2 的形式。
     * @return URL 所代表远程资源的响应结果
     */
    public static String sendGet(String url, String param) {
        String result = "";
        BufferedReader in = null;
        try {
            String urlNameString = url + "?" + param;
            URL realUrl = new URL(urlNameString);
            // 打开和URL之间的连接
            URLConnection connection = 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; MSIE 6.0; Windows NT 5.1;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 (String key : map.keySet()) {
                System.out.println(key + "--->" + map.get(key));
            }
            // 定义 BufferedReader输入流来读取URL的响应
            in = new BufferedReader(new InputStreamReader(
                    connection.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            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 (Exception e2) {
                e2.printStackTrace();
            }
        }
        return result;
    }

    /**
     * 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=value1&name2=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;
    }    
}

发送post 参数json

/**
     * 发送post请求
     * @param url  路径
     * @param jsonObject  参数(json类型)
     * @param encoding 编码格式
     * @return
     * @throws ParseException
     * @throws IOException
     */
    public static String send(String url, JSONObject jsonObject,String encoding) throws ParseException, IOException{
        String body = "";
 
        //创建httpclient对象
        CloseableHttpClient client = HttpClients.createDefault();
        //创建post方式请求对象
        HttpPost httpPost = new HttpPost(url);
 
        //装填参数
        StringEntity s = new StringEntity(jsonObject.toString(), "utf-8");
        s.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE,
                "application/json"));
        //设置参数到请求对象中
        httpPost.setEntity(s);
        System.out.println("请求地址："+url);
//        System.out.println("请求参数："+nvps.toString());
 
        //设置header信息
        //指定报文头【Content-type】、【User-Agent】
//        httpPost.setHeader("Content-type", "application/x-www-form-urlencoded");
        httpPost.setHeader("Content-type", "application/json");
        httpPost.setHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
 
        //执行请求操作，并拿到结果（同步阻塞）
        CloseableHttpResponse response = client.execute(httpPost);
        //获取结果实体
        HttpEntity entity = response.getEntity();
        if (entity != null) {
            //按指定编码转换结果实体为String类型
            body = EntityUtils.toString(entity, encoding);
        }
        EntityUtils.consume(entity);
        //释放链接
        response.close();
        return body;
    }

import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;

import net.sf.json.JSONObject;

import org.apache.http.HttpResponse;
import org.apache.http.HttpStatus;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicHeader;
import org.apache.http.protocol.HTTP;

public abstract class TestSend {

   // String URL = "url";

    public static void main(String[] args) {

        JSONObject jsobj1 = new JSONObject();
         jsobj1.put("key","value");
        
        
        //System.out.println(jsobj1);
        post(jsobj1,"url");//注册
    }

    public static String post(JSONObject json,String URL) {

        HttpClient client = new DefaultHttpClient();
        HttpPost post = new HttpPost(URL);
        post.setHeader("Content-Type", "application/json");
        post.addHeader("Authorization", "Basic YWRtaW46");
        String result = "";
        
        try {

            StringEntity s = new StringEntity(json.toString(), "utf-8");
            s.setContentEncoding(new BasicHeader(HTTP.CONTENT_TYPE,
                    "application/json"));
            post.setEntity(s);

            // 发送请求
            HttpResponse httpResponse = client.execute(post);

            // 获取响应输入流
            InputStream inStream = httpResponse.getEntity().getContent();
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    inStream, "utf-8"));
            StringBuilder strber = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null)
                strber.append(line + "
");
            inStream.close();

            result = strber.toString();
            System.out.println(result);
            
            if (httpResponse.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
                
                    System.out.println("请求服务器成功，做相应处理");
                
            } else {
                
                System.out.println("请求服务端失败");
                
            }
            

        } catch (Exception e) {
            System.out.println("请求异常");
            throw new RuntimeException(e);
        }

        return result;
    }

}