Question

我试图将Json响应字符串作为参数传递给jsonObject，如下面给出的代码中的Yahoo http://developer.yahoo.com/java/howto-parseRestJava.html所示，这是为了获得雅虎搜索结果：

/**
 * ParseYahooSearchResultsJSON.java
 * This example shows how to parse Yahoo! Web Service search results returned in JSON format. 
 *
 * @author Daniel Jones www.danieljones.org
 */

import java.io.*;

import org.json.*;

import org.apache.commons.httpclient.*;
import org.apache.commons.httpclient.methods.*;

public class ParseYahooSearchResultsJSON {

    public static void main(String[] args) throws Exception {
        String request = "http://api.search.yahoo.com/WebSearchService/V1/webSearch?appid=YahooDemo&query=umbrella&results=10&output=json";

        HttpClient client = new HttpClient();
        GetMethod method = new GetMethod(request);

        // Send GET request
        int statusCode = client.executeMethod(method);

        if (statusCode != HttpStatus.SC_OK) {
            System.err.println("Method failed: " + method.getStatusLine());
        }
        InputStream rstream = null;

        // Get the response body
        rstream = method.getResponseBodyAsStream();

        // Process the response from Yahoo! Web Services
        BufferedReader br = new BufferedReader(new InputStreamReader(rstream));
        String jsonString = "";
        String line;
        while ((line = br.readLine()) != null) {
            jsonString += line;
        }
        br.close();

        // Construct a JSONObject from a source JSON text string.
        // A JSONObject is an unordered collection of name/value pairs. Its external 
        // form is a string wrapped in curly braces with colons between the names 
        // and values, and commas between the values and names.
        JSONObject jo = new JSONObject(jsonString);

        // A JSONArray is an ordered sequence of values. Its external form is a 
        // string wrapped in square brackets with commas between the values.
        JSONArray ja;

        // Get the JSONObject value associated with the search result key.
        jo = jo.getJSONObject("ResultSet");

        //System.out.println(jo.toString());

        // Get the JSONArray value associated with the Result key
        ja = jo.getJSONArray("Result");

        // Get the number of search results in this set
        int resultCount = ja.length();

        // Loop over each result and print the title, summary, and URL
        for (int i = 0; i < resultCount; i++)
        {
            JSONObject resultObject = ja.getJSONObject(i);
            System.out.println(resultObject.get("Title"));
            System.out.println(resultObject.get("Summary"));
            System.out.println(resultObject.get("Url"));
            System.out.println("--");
        }
    }
}

添加所需的身份验证代码并包含所需的jar后，我收到以下错误：

找不到JSONObject [“ResultSet”]。在 org.json.JSONObject.get（JSONObject.java:422）at org.json.JSONObject.getJSONObject（JSONObject.java:516）at SignPostTest.parseResponse（SignPostTest.java:187）at SignPostTest.main（SignPostTest.java:222）

这是Json响应字符串的开头：

{"bossresponse":{"responsecode":"200","web":{"start":"0","count":"50","totalresults":"36800","results":[{"date": "","clickurl":"http:\/\/uk.news.yahoo.com\/apple\/","url":"http:\/\/uk.news.yahoo.com\/apple\/","dispurl":"uk.news.yahoo.com\/apple","title":"Latest Apple news | headlines â€“ Yahoo! News UK","abstract":"Get the latest Apple news on Yahoo! News UK. Find in-depth commentary on Apple in our full coverage news section."},{"date": "","clickurl":"http:\/\/answers.yahoo.com\/question\/index?qid=20080113074727AAuSMGy","url":"http:\/\/answers.yahoo.com\/question\/index?qid=20080113074727AAuSMGy","dispurl":"answers.yahoo.com\/question\/index?qid=20080113074727AAuSMGy","title":"JailBreak <b>Ipod? - Yahoo<\/b>! Answers","abstract":"Best Answer: Jailbreaking Guide ok jailbreaking is when you download the AppSnapp (found at www.jailbreakme.com) application to your iPod touch after first ..."},{"date":

查看响应和对象名称，似乎雅虎在响应中做了一些更改，并且我将以下两行代码更改为：

// Get the JSONObject value associated with the search result key.
jo = jo.getJSONObject("bossresponse");

// Get the JSONArray value associated with the Result key
ja = jo.getJSONArray("results");

我仍然收到错误：

org.json.JSONException：找不到JSONObject [“results”]。在 org.json.JSONObject.get（JSONObject.java:422）at org.json.JSONObject.getJSONArray（JSONObject.java:498）at SignPostTest.parseResponse（SignPostTest.java:185）at SignPostTest.main（SignPostTest.java:222）

我不知道问题出在哪里。这是我第一次进行json解析。我可能会在某种程度上产生误解。请澄清一下。

Answer 1

上面提到的yahoo URL正在发送错误，因为json响应在描述

中说明

＆＃34;该服务已关闭。有关详细信息，请参阅弃用服务博客文章http://developer.yahoo.com/blogs/ydn/posts/2010/08/api_updates_and_changes＆＃34;

这就是您无法访问JSON Response的预期属性的原因。

解析来自雅虎BOSS的Json回复。错误

1 个答案: