将字符串转换为JSONObject

我只是想正确地进入它。我在LogCat中得到一个错误，说我的JSON字符串不能转换成JSONOject，我真的不知道如何解决这个错误，所以我只希望有人比我有更好的知识可以给我关于如何我的建议可以参加到这个问题将字符串转换为JSONObject

的logcat：

08-02 00:12:28.485: E/JSON Parser(778): Error parsing data org.json.JSONException: Value <!doctype of type java.lang.String cannot be converted to JSONObject

JSONParser类

public class JSONParser { 

    InputStream is; 
    JSONObject jObj; 
    String json = ""; 
    public EditText et; 

    public JSONParser() { 
    } 

    public JSONObject readJSONFeed(String URL) { 

     try{ 
     HttpClient client = new DefaultHttpClient(); 
     HttpPost request = new HttpPost(URL); 
     //request.setURI(website); 
     try { 
      HttpResponse response = client.execute(request); 
     HttpEntity httpEntity = response.getEntity(); 
     is = httpEntity.getContent(); 

     } catch (ClientProtocolException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
     } 
     try { 
      BufferedReader reader = new BufferedReader(new InputStreamReader(
        is, "iso-8859-1"), 8); 
      StringBuilder sb = new StringBuilder(); 
      String line; 
      while ((line = reader.readLine()) != null) { 
       sb.append(line + "\n"); 
      } 
      is.close(); 
      json = sb.toString(); 
     } catch (Exception e) { 
      Log.e("Buffer Error", "Error converting result " + e.toString()); 
     } 

     try { 
      jObj = new JSONObject(json); 
     } catch (JSONException e) { 
      Log.e("JSON Parser", "Error parsing data " + e.toString()); 
     } 

     return jObj; 

     }finally{} 

    }{ 
    }}

这是导致出现此错误的方法：

try { 
     jObj = new JSONObject(json); 
    } catch (JSONException e) { 
     Log.e("JSON Parser", "Error parsing data " + e.toString()); 
    }

我印我的JSON字符串：

08-02 20:02:27.535: D/JSON String(795): <!doctype html public "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> 
08-02 20:02:27.535: D/JSON String(795): <html><head><title>Yahoo! - 404 Not Found</title><style> 
08-02 20:02:27.535: D/JSON String(795): /* nn4 hide */ 
08-02 20:02:27.535: D/JSON String(795): /*/*/ 
08-02 20:02:27.535: D/JSON String(795): body {font:small/1.2em arial,helvetica,clean,sans-serif;font:x-small;text-align:center;}table {font-size:inherit;font:x-small;} 
08-02 20:02:27.535: D/JSON String(795): html>body {font:83%/1.2em arial,helvetica,clean,sans-serif;}input {font-size:100%;vertical-align:middle;}p, form {margin:0;padding:0;} 
08-02 20:02:27.535: D/JSON String(795): p {padding-bottom:6px;margin-bottom:10px;}#doc {width:48.5em;margin:0 auto;border:1px solid #fff;text-align:center;}#ygma {text-align:right;margin-bottom:53px} 
08-02 20:02:27.535: D/JSON String(795): #ygma img {float:left;}#ygma div {border-bottom:1px solid #ccc;padding-bottom:8px;margin-left:152px;}#bd {clear:both;text-align:left;width:75%;margin:0 auto 20px;} 
08-02 20:02:27.535: D/JSON String(795): h1 {font-size:135%;text-align:center;margin:0 0 15px;}legend {display:none;}fieldset {border:0 solid #fff;padding:.8em 0 .8em 4.5em;} 
08-02 20:02:27.535: D/JSON String(795): form {position:relative;background:#eee;margin-bottom:15px;border:1px solid #ccc;border-width:1px 0;} 
08-02 20:02:27.535: D/JSON String(795): #s1p {width:15em;margin-right:.1em;} 
08-02 20:02:27.535: D/JSON String(795): form span {position:absolute;left:70%;top:.8em;}form a {font:78%/1.2em arial;display:block;padding-left:.8em;white-space:nowrap;background: url(http://l.yimg.com/a/i/s/bullet.gif) no-repeat left center;} 
08-02 20:02:27.535: D/JSON String(795): form .sep {display:none;}.more {text-align:center;}#ft {padding-top:10px;border-top:1px solid #999;}#ft p {text-align:center;font:78% arial;} 
08-02 20:02:27.535: D/JSON String(795): /* end nn4 hide */ 
08-02 20:02:27.535: D/JSON String(795): </style></head> 
08-02 20:02:27.535: D/JSON String(795): <body><div id="doc"> 
08-02 20:02:27.535: D/JSON String(795): <div id="ygma"><a href="http://us.rd.yahoo.com/404/*http://www.yahoo.com"><img 
08-02 20:02:27.535: D/JSON String(795): src=http://l.yimg.com/a/i/yahoo.gif 
08-02 20:02:27.535: D/JSON String(795): width=147 height=31 border=0 alt="Yahoo!"></a><div><a 
08-02 20:02:27.535: D/JSON String(795): href="http://us.rd.yahoo.com/404/*http://www.yahoo.com">Yahoo!</a> 
08-02 20:02:27.535: D/JSON String(795): - <a href="http://us.rd.yahoo.com/404/*http://help.yahoo.com">Help</a></div></div> 
08-02 20:02:27.535: D/JSON String(795): <div id="bd"><h1>Sorry, the page you requested was not found.</h1> 
08-02 20:02:27.535: D/JSON String(795): <p>Please check the URL for proper spelling and capitalization. If 
08-02 20:02:27.535: D/JSON String(795): you're having trouble locating a destination on Yahoo!, try visiting the 
08-02 20:02:27.535: D/JSON String(795): <strong><a 
08-02 20:02:27.535: D/JSON String(795): href="http://us.rd.yahoo.com/404/*http://www.yahoo.com">Yahoo! home 
08-02 20:02:27.535: D/JSON String(795): page</a></strong> or look through a list of <strong><a 
08-02 20:02:27.535: D/JSON String(795): href="http://us.rd.yahoo.com/404/*http://docs.yahoo.com/docs/family/more/">Yahoo!'s 
08-02 20:02:27.535: D/JSON String(795): online services</a></strong>. Also, you may find what you're looking for 
08-02 20:02:27.535: D/JSON String(795): if you try searching below.</p> 
08-02 20:02:27.535: D/JSON String(795): <form name="s1" action="http://us.rd.yahoo.com/404/*-http://search.yahoo.com/search"><fieldset> 
08-02 20:02:27.535: D/JSON String(795): <legend><label for="s1p">Search the Web</label></legend> 
08-02 20:02:27.535: D/JSON String(795): <input type="text" size=30 name="p" id="s1p" title="enter search terms here"> 
08-02 20:02:27.535: D/JSON String(795): <input type="submit" value="Search"> 
08-02 20:02:27.535: D/JSON String(795): <span><a href="http://us.rd.yahoo.com/404/*http://search.yahoo.com/search/options?p=">advanced search</a> <span class=sep>|</span> <a href="http://us.rd.yahoo.com/404/*http://buzz.yahoo.com">most popular</a></span> 
08-02 20:02:27.535: D/JSON String(795): </fieldset></form> 
08-02 20:02:27.535: D/JSON String(795): <p class="more">Please try <strong><a 
08-02 20:02:27.535: D/JSON String(795): href="http://us.rd.yahoo.com/404/*http://help.yahoo.com">Yahoo! 
08-02 20:02:27.535: D/JSON String(795): Help Central</a></strong> if you need more assistance.</p> 
08-02 20:02:27.535: D/JSON String(795): </div><div id="ft"><p>Copyright &copy; 2013 Yahoo! Inc. 
08-02 20:02:27.535: D/JSON String(795): All rights reserved. <a 
08-02 20:02:27.535: D/JSON String(795): href="http://us.rd.yahoo.com/404/*http://privacy.yahoo.com">Privacy 
08-02 20:02:27.535: D/JSON String(795): Policy</a> - <a 
08-02 20:02:27.535: D/JSON String(795): href="http://us.rd.yahoo.com/404/*http://docs.yahoo.com/info/terms/">Terms 
08-02 20:02:27.535: D/JSON String(795): of Service</a></p></div> 
08-02 20:02:27.535: D/JSON String(795): </div></body></html>

来源

2013-08-02 Bob Last

打印你的'json'字符串。它可能不是有效的JOSN格式化字符串。 – Rajeev

'<！doctype ...'不是有效的JSON字符串。它看起来像你试图让JSON解析器解析HTML。请包含您的JSON字符串。 –

errrrrrrrrgh为什么人们在用'gSon'时可以用手工做... https://code.google.com/p/google-gson/ –

您的字符串必须JSON编码。 See the android documentation for the constructor that you're attempting to use.这意味着您的字符串应该如下所示：

{ "key1": "value1", "key2": "value2", "key3": "value3" }

可能带有转义引号。

根据您的错误消息，它看起来好像您尝试从HTML或其他标记语言创建JSONObject。您可能需要验证您打电话的URL实际上是否返回了有效的JSON，并且您要添加所有正确的参数和标题以防止将错误页面作为响应。

来源

2013-08-02 16:09:20 MattDavis

尝试DIS希望它会工作的ü

public class TestObjectToJson { 
     public int k1 = 1; 
     public String k2 = "Test"; 

     public static void main(String[] args) { 
      TestObjectToJson obj = new TestObjectToJson(); 
      Gson gson = new Gson(); 
    String json = gson.toJson(obj); 

      System.out.println(json); 
     } 

    }

仅供参考ü可以看到这个

https://code.google.com/p/google-gson/

来源

2013-08-02 16:22:42 Developer

将字符串转换为JSONObject

回答

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