访问Http接口的两种请求方式

1. POST方式请求

public void testPostLogin() throws  Exception{
    String url = "http://192.168.1.160:8080/app/user/login.xhtml";
    Map<String,String> paramMap = new HashMap<String,String>();
    paramMap.put("username","ting");
    paramMap.put("password","1");
    URL realUrl = new URL(url);
    // 打开与URL之间的链接
    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)\"");
    conn.setRequestProperty("Charset","UTF-8");
    //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
    PrintWriter out = new PrintWriter(conn.getOutputStream());
    // 设置请求属性
    String param = "";
    if(paramMap!=null&&paramMap.size()>0){
        for(Map.Entry<String,String> entry :paramMap.entrySet()){
            String key = entry.getKey();
            String value = entry.getValue();
            param += (key+"="+value+"&");
        }
        param = param.substring(0,param.length()-1);
    }
    // 发送请求参数
    out.print(param);
    // flush输出流缓冲
    out.flush();
    // 定义BufferedReader输入流来读取URL的响应
    BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream(),"UTF-8"));
    String line ;
    String result = "" ;
    while((line=reader.readLine())!=null){
        result +=line;
    }
    JSONParser parser = new JSONParser();
    JSONObject jsonObject = (JSONObject)parser.parse(result);
    Object regFlag = jsonObject.get("retFlag");
    Object message = jsonObject.get("message");
    Object data = jsonObject.get("data");
    jsonObject = (JSONObject)parser.parse(data.toString());
    Object id = jsonObject.get("id");
    Object username = jsonObject.get("username");
    System.out.print(result);
}

2. GET方式请求

public void testGetLogin() throws  Exception{
    URL url = new URL("http://192.168.1.160:8080/app/user/login.xhtml?username=ting&password=1");
    HttpURLConnection connection = (HttpURLConnection) url.openConnection();
    connection.connect();
    BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream(),"UTF-8"));
    String line ;
    StringBuilder sb = new StringBuilder();
    while((line=reader.readLine())!=null){
        sb.append(line);
    }
    connection.disconnect();
    JSONParser parser = new JSONParser();
    JSONObject jsonObject = (JSONObject)parser.parse(sb.toString());
    Object regFlag = jsonObject.get("retFlag");
    Object message = jsonObject.get("message");
    Object data = jsonObject.get("data");
    jsonObject = (JSONObject)parser.parse(data.toString());
    Object id = jsonObject.get("id");
    Object username = jsonObject.get("username");

    System.out.print(sb.toString());
}