settHeader ("content type", "") - 混淆

Question

我有一个函数，我想将两个变量发布到 php 端，在这两个变量匹配并且服务器处理结果之后，我想以 JSON 格式返回结果。截至目前，我设置的标头属性如下所示：

httppost.setHeader("Content-type", "application/json");

但是在Wikipedia 继续阅读时，我发现内容类型应该是 application/x-www-form-urlencoded 并且接受 JSON 应该是 Accept: application/json 我想要更清楚地了解这一点，如何修改我的代码以达到我想要的结果?到目前为止，我正在使用本地主机，并且我的 POST 变量似乎没有在 php 端传递。以下是我的完整功能：

public void parse(String last, String pwd){
        String lastIndex = last;
        DefaultHttpClient http = new DefaultHttpClient(new BasicHttpParams()); 
        System.out.println("URL is: "+CONNECT_URL); 
        HttpPost httppost = new HttpPost(CONNECT_URL);
        httppost.setHeader("Content-type", "application/json");
        try{

            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
            nameValuePairs.add(new BasicNameValuePair("key", password));
            nameValuePairs.add(new BasicNameValuePair("last_index", lastIndex));

            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));



            System.out.println("Post variables(Key): "+password+"");
            System.out.println("Post variables(last index): "+lastIndex);




            HttpResponse resp = http.execute(httppost); 
            HttpEntity entity = resp.getEntity();
            ins = entity.getContent(); 


            BufferedReader bufread = new BufferedReader(new InputStreamReader(ins, "UTF-8"), 8); 
            StringBuilder sb = new StringBuilder(); 
            String line = null; 

            while((line = bufread.readLine()) != null){
                sb.append(line +"\n"); 
            }
            result = sb.toString(); 
            System.out.println("Result: "+result); 



            //  readAndParseJSON(result);
        }catch (Exception e){
            System.out.println("Error: "+e);
        }finally{
            try{
                if(ins != null){
                    ins.close();
                }
            }catch(Exception smash){
                System.out.println("Squish: "+smash); 
            }
        }
        //  return  result; 

    }

Answer 1

您遇到了大写问题。尝试 "Content-Type" 而不是 "Content-type"（或使用 const HTTP.CONTENT_TYPE）。

Answer 2

看起来你的代码实际上是在做那篇文章描述的事情，除了

// httppost.setHeader("Content-type", "application/json");
httppost.setHeader("Content-Type", "application/x-www-form-urlencoded");
httppost.setHeader("Accept", "application/json");

您在此处添加 x-www-form-urlencoded 内容

httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));