Java原生类库发送-get-post-请求

jiezi
5 年前
下面是整个工具的全部代码，其中用到了 fastjson：
package util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Map;
import com.alibaba.fastjson.JSON;


public class HttpUtil {public static String sendGet(String httpurl) {
        HttpURLConnection connection = null;
        InputStream is = null;
        BufferedReader br = null;
        String result = null;// 返回结果字符串
        try {
            // 创建远程 url 连接对象
            URL url = new URL(httpurl);
            // 通过远程 url 连接对象打开一个连接，强转成 httpURLConnection 类
            connection = (HttpURLConnection) url.openConnection();
            // 设置连接方式：get
            connection.setRequestMethod("GET");
            // 设置连接主机服务器的超时时间：15000 毫秒
            connection.setConnectTimeout(15000);
            // 设置读取远程返回的数据时间：60000 毫秒
            connection.setReadTimeout(60000);
            // 发送请求
            connection.connect();
            // 通过 connection 连接，获取输入流
            if (connection.getResponseCode() == 200) {is = connection.getInputStream();
                // 封装输入流 is，并指定字符集
                br = new BufferedReader(new InputStreamReader(is, "UTF-8"));
                // 存放数据
                StringBuffer sbf = new StringBuffer();
                String temp = null;
                while ((temp = br.readLine()) != null) {sbf.append(temp);
                    sbf.append("\r\n");
                }
                result = sbf.toString();}
        } catch (MalformedURLException e) {e.printStackTrace();
        } catch (IOException e) {e.printStackTrace();
        } finally {
            // 关闭资源
            if (null != br) {
                try {br.close();
                } catch (IOException e) {e.printStackTrace();
                }
            }
    
            if (null != is) {
                try {is.close();
                } catch (IOException e) {e.printStackTrace();
                }
            }
    
            connection.disconnect();// 关闭远程连接}
    
        return result;
    }

    
    

    
    
    
    
    public static String sendPost(String URL,Map<String, Object> map){
        OutputStreamWriter out = null;
        BufferedReader in = null;
        StringBuilder result = new StringBuilder();
        HttpURLConnection conn = null;
        try{URL url = new URL(URL);
            conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("POST");
            // 发送 POST 请求必须设置为 true
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // 设置连接超时时间和读取超时时间
            conn.setConnectTimeout(30000);
            conn.setReadTimeout(10000);
            conn.setRequestProperty("Content-Type", "application/json");
            conn.setRequestProperty("Accept", "application/json");
            // 获取输出流
            out = new OutputStreamWriter(conn.getOutputStream());
    //                String jsonStr = "{\"qry_by\":\"name\", \"name\":\"Tim\"}";
            String jsonStr = JSON.toJSONString(map);

            out.write(jsonStr);
            out.flush();
            out.close();
            // 取得输入流，并使用 Reader 读取
            if (200 == conn.getResponseCode()){in = new BufferedReader(new InputStreamReader(conn.getInputStream(), "UTF-8"));
                String line;
                while ((line = in.readLine()) != null){result.append(line);
                }
            }else{System.out.println("ResponseCode is an error code:" + conn.getResponseCode());
            }
        }catch (Exception e){e.printStackTrace();
        }finally {
            try{if(out != null){out.close();
                }
                if(in != null){in.close();
                }
            }catch (IOException ioe){ioe.printStackTrace();
            }
        }
        return result.toString();}

}
在 2019 年 9 月 3 日 15:50:51 测试通过，post 方法中参数采用 map 类型兼容性更好，可以和 spring 配置使用
使用 Java 原生类库发送 get post 请求
