Java原生类库发送 get post 请求

发布于 2019-09-03  约 9 分钟

使用Java原生类库发送get post请求

  • 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
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