如何将JSON字符串作为POST参数传递，以避免Java中的字符编码？

Question

我正在尝试将POST param发送到我拥有的REST端点。这个param是一个JSON字符串，包含像双引号(")这样的特殊字符。

THis是请求部分：

    HttpClient client = HttpClientBuilder.create().build();
    StringBuilder query = new StringBuilder();
    query.append(callBackURL);
    ArrayList<NameValuePair> urlParameters = new ArrayList<NameValuePair>();
    urlParameters.add(new BasicNameValuePair("update", "{\"object\":\"page\",\"entry\":[{\"id\":\"316492991876763\",\"time\":1417436403,\"changes\":[{\"field\":\"feed\",\"value\":{\"item\":\"comment\",\"verb\":\"add\",\"comment_id\":\"321528008039928_323256911200371\",\"parent_id\":\"316492991876763_321528008039928\",\"sender_id\":100006737955082,\"created_time\":1417436403}}]}]}"));
    try {
        HttpPost post = new HttpPost(query.toString());
        post.setEntity(new UrlEncodedFormEntity(urlParameters));
        post.addHeader("content-type", "application/json");
        HttpResponse response = null;
        try {
            response = client.execute(post);
        } 
        catch (IOException e) {
            System.out.println(e.getMessage());
        }
    } 
    catch (UnsupportedEncodingException e2) {
        System.out.println(e2.getMessage());
    }

现在在端点部分：

/**
 * Callback method that receives FB updates
 * @return 200 OK if everything goes OK, 401 ERROR otherwise
 */
@POST
@Path("/callback")
@Consumes(MediaType.APPLICATION_JSON)
public Response facebookUpdate(String update, @Context HttpServletRequest request, @Context HttpServletResponse response) throws ServletException, IOException{
    JsonParser jsonParser = new JsonParser();
    //parse it
    JsonElement json = jsonParser.parse(update);
    ...
}

我得到的是这样编码的字符串：

%7B%22object%22%3A%22page%22%2C%22entry%22%3A%5B%7B%22id%22%3A%22316492991876763%22%2C%22time%22%3A1417436403%2C%22changes%22%3A%5B%7B%22field%22%3A%22feed%22%2C%22value%22%3A%7B%22item%22%3A%22comment%22%2C%22verb%22%3A%22add%22%2C%22comment_id%22%3A%22321528008039928_323256911200371%22%2C%22parent_id%22%3A%22316492991876763_321528008039928%22%2C%22sender_id%22%3A100006737955082%2C%22created_time%22%3A1417436403%7D%7D%5D%7D%5D%7D

一些我不能转换成JsonElement的东西..。

有什么办法避免这种情况吗？

谢谢!亚历杭德罗

更新：

我发现了问题所在，所以我在这里解释，以防有人有同样的问题。

我试图使用BasicNameValuePair传递一个param，如下所示：

ArrayList<NameValuePair> urlParameters = new ArrayList<NameValuePair>();
    urlParameters.add(new BasicNameValuePair("update", "{\"object\":\"page\",\"entry\":[{\"id\":\"316492991876763\",\"time\":1417436403,\"changes\":[{\"field\":\"feed\",\"value\":{\"item\":\"comment\",\"verb\":\"add\",\"comment_id\":\"321528008039928_323256911200371\",\"parent_id\":\"316492991876763_321528008039928\",\"sender_id\":100006737955082,\"created_time\":1417436403}}]}]}"));

我已经更改为一个简单的StringEntity，如下所示：

StringEntity params = new StringEntity(json.toString());
HttpPost post = new HttpPost(query.toString());

因此，我不需要破译。迷思仍然存在于为什么传递一个BasicNameValuePair数组将编码字符串..。

Answer 1

使用上面的注释，您希望从以下方法生成JSON

@Produces("application/json")