通过Java

Question

我有这个代码，我正在执行http client以获得回复。

public String exmp(StringBuilder sql, String table){
    authCache = new BasicAuthCache();
    basicAuth = new BasicScheme();
    authCache.put(target, basicAuth);

    localContext = HttpClientContext.create();
    localContext.setAuthCache(authCache);
    String postJsonstr=null;
    try {
        HttpPost httpPost = new HttpPost(API_URL);

        StringBuilder str = new StringBuilder();
        str.append("{");
        str.append("\"format\":\"csv\",");
        str.append("\"version\":\"1.0\",");
        str.append("\"name\":\""+table+"\",");
        str.append("\"encrypted\":\"none\",");
        str.append("\"queries\":[{");
        str.append("\"name\":\""+table+"\",");
        str.append("\"query\":\"" + sql + "\",");
        str.append("\"type\":\"export\"");
        str.append("}]");
        str.append("}");

        httpPost.addHeader("accept", jsonContentType);
        StringEntity posEnt = new StringEntity(str.toString().trim());
        posEnt.setContentType(jsonContentType);
        httpPost.setEntity(posEnt);

        CloseableHttpResponse response = httpclient.execute(target, httpPost, localContext);}

当我执行此代码时，我收到的错误为：org.json.JSONException: A JSONObject text must begin with '{' at 1 [character 2 line 1]。

我尝试System.out.println((int)sb.toString().trim().charAt(0));来查看第一个字符的来源，123根据某些帖子是“{”的正确代码。

在上面的代码中，httpclient是类（static CloseableHttpClient httpclient;）的全局变量，并在一个函数中初始化，该函数在使用httpclient = {{main的上述函数之前调用1}}。

当我在第一个字符HttpClients.custom().setDefaultCredentialsProvider(credentials).build();时，我无法理解为什么会出现此错误。

更新后的代码：这是我使用{的更新代码。我仍然得到同样的错误

JSONObject

Answer 1

String.format("{\"format \":\"csv \""
            + ",\"version \":\"1.0 \""
            + ",\"name \":\"%s\""
            + ",\"encrypted \":\"none \""
            + ",\"queries \":[{\"name \":\"%s\"\""
                           + ",\"query\":\"%s\""
                           + ",\"type\":\"export\"}]}",
              table, table, sql);