Java发送http请求

前言

项目上有时候需要发送http请求并获取返回的Json结果，这里记录下请求和接受返回的方法。

使用Java自带方法发送http请求

• 参数：
  • 请求地址：url e.g. http://192.168.1.107:7777/api/test;
  • 参数：bodys 键值对Map对象;
  • 请求头：headers 键值对Map对象;
  • 方法名：method e.g. POST/PUT;

/**
 * 
 * @param url
 * @param bodys
 * @param headers
 * @param method
 * @return
 * @throws IOException
 */
public static String sendPostRequest(String url, Map<String,String> bodys,Map<String,String> headers,String method) throws IOException {
    StringBuilder builder = new StringBuilder();
    Set<Map.Entry<String,String>> entrys = null;
    if(bodys!=null && !bodys.isEmpty()){
        entrys = bodys.entrySet();
        for (Map.Entry<String, String> entry : entrys) {
            builder.append(entry.getKey()).append("=").append(URLEncoder.encode(entry.getValue()==null?"":entry.getValue(),"UTF-8")).append("&");
        }
        builder.deleteCharAt(builder.length() - 1);
    }
    URL _url = new URL(url);
    HttpURLConnection con = (HttpURLConnection)_url.openConnection();
    if(headers!=null && !headers.isEmpty()){
        entrys = headers.entrySet();
        for (Map.Entry<String, String> entry : entrys) {
            con.setRequestProperty(entry.getKey(),entry.getValue());
        }
    }
    con.setRequestMethod(method);
    con.setDoOutput(true);
    con.setDoInput(true);
    OutputStream os = con.getOutputStream();
    os.write(builder.toString().getBytes("UTF-8"));
    os.flush();
    os.close();

    String str = "";
    if(con.getResponseCode() == 200){
        BufferedReader reader = new BufferedReader(new InputStreamReader(con.getInputStream()));
        str = reader.readLine();
    }
    return str;
}