java HttpURLConnection传递键值对参数，表单参数

当表头设置参数类型为这个的时候，
conn.setRequestProperty(“Content-Type”,“application/x-www-form-urlencoded”);

如果参数用的是jsonstring的话，在请求中，参数会都跑到key中，而且不会自动识别key和value；

     String data = requestParams;
     HttpURLConnection conn = (HttpURLConnection) new URL(url).openConnection();
     //设置请求方式,请求超时信息
     conn.setRequestMethod("POST");
     conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
     conn.setRequestProperty("Content-Length",String.valueOf(data.getBytes().length));

     conn.setReadTimeout(5000);
     conn.setConnectTimeout(5000);
     //设置运行输入,输出:
     conn.setDoOutput(true);
     conn.setDoInput(true);
     //Post方式不能缓存,需手动设置为false

// conn.setUseCaches(false);

     //获取输出流
     OutputStreamWriter writer = new OutputStreamWriter(conn.getOutputStream(),"UTF-8");
     writer.write(data);
     writer.flush();
     writer.close();

将参数换成用string配合=&拼接成的数据就行；

比如需要name=‘123’，age=13
需要拼接string str = “name = 123&age=13”
然后直接str转成byte传进去就行

  StringBuilder stringBuilder = new StringBuilder();
  try {
     stringBuilder.append("apiKey="+ URLEncoder.encode(apiKey,"UTF-8"));
     stringBuilder.append("&jobNum="+ URLEncoder.encode(tv_job_num.getText().toString(),"UTF-8"));
     stringBuilder.append("&prodOrderNum="+ URLEncoder.encode(prodOrderNum,"UTF-8"));


  } catch (UnsupportedEncodingException e) {
     throw new RuntimeException(e);
  }

// jsonObject.put(“jobNum”,tv_job_num.getText().toString());
// jsonObject.put(“jobNum”,“HX2619”);
// jsonObject.put(“prodOrderNum”,prodOrderNum);
// jsonObject.put(“apiKey”,apiKey);

// return jsonObject.toJSONString();
return stringBuilder.toString();