如何从 java 客户端使用 JSON Webservice

Question

public void doView(RenderRequest renderRequest, RenderResponse renderResponse) throws IOException, PortletException {
    Map countryList = new HashMap();
    String str = "http://10.10.10.25/TEPortalIntegration/CustomerPortalAppIntegrationService.svc/PaymentSchedule/PEPL/Unit336";
    try {
        URL url = new URL(str);
        URLConnection urlc = url.openConnection();
        BufferedReader bfr = new BufferedReader(new InputStreamReader(urlc.getInputStream()));
        String line, title, des;
        while ((line = bfr.readLine()) != null) {
            JSONArray jsa = new JSONArray(line);
            for (int i = 0; i < jsa.length(); i++) {
                JSONObject jo = (JSONObject) jsa.get(i);
                title = jo.getString("Amount"); 
                countryList.put(i, title);
            }
            renderRequest.setAttribute("out-string", countryList);
            super.doView(renderRequest, renderResponse);
        }
    } catch (Exception e) {
    }
}

我正在尝试从 liferay portlet 类访问json对象，我想将任何json字段的值数组传递给 jsp 页面。

Answer 1

在

将其转换为 JSON 数组之前，您需要阅读完整的响应。这是因为响应中的每一行都将是一个（无效的）JSON 片段，无法单独解析。稍作修改，您的代码应该可以工作，下面突出显示：

// fully read response
final String line;
final StringBuilder builder = new StringBuilder(2048);
while ((line = bfr.readLine()) != null) {
    builder.append(line);
}
// convert response to JSON array
final JSONArray jsa = new JSONArray(builder.toString());
// extract out data of interest
for (int i = 0; i < jsa.length(); i++) {
    final JSONObject jo = (JSONObject) jsa.get(i);
    final String title = jo.getString("Amount"); 
    countryList.put(i, title);
}