通过http.client解析url返回的数据时为什么中文变成了unicode码

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今天在解析json数据的时候得到了一堆这样的数据：{"errNum":0,"errMsg":"success","retData":[{"title":"\u6536\u5e9f\u54c1\u5927\u53d4\u521a\u4e0a\u53f0\uff0c\u5c31\u60e8\u906d\u8bc4\u59d4\u706d\u706f\uff0c\u4f46\u63a5\u4e0b\u6765\u5168\u573a\u90fd\u9707\u60ca\u4e86\uff01","url":"http:\/\/toutiao.com\/group\/6263036756505920002\/","abstract":"\u8ba2\u9605\u6211\u83b7\u53d6\u66f4\u591a\u7cbe\u5f69\u5185\u5bb9\uff01","image_url":"http:\/\/p1.pstatp.com\/list\/2f90009a31a7ee8bb15"}]}

这是因为，为了更好的传输中文，json进行了Unicode编码。

这样一来，我们在解析json之前，就得要先将json数据中的Unicode编码转换为我们使用的中文；

一：http请求数据返回json中string字段包含unicode的转码

public static String decodeUnicode(String theString) {
char aChar;
int len = theString.length();
StringBuffer outBuffer = new StringBuffer(len);
for (int x = 0; x < len;) {
aChar = theString.charAt(x++);
if (aChar == '\\') {
aChar = theString.charAt(x++);
if (aChar == 'u') {
// Read the xxxx
int value = 0;
for (int i = 0; i < 4; i++) {
aChar = theString.charAt(x++);
switch (aChar) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
value = (value << 4) + aChar - '0';
break;
case 'a':
case 'b':
case 'c':
case 'd':
case 'e':
case 'f':
value = (value << 4) + 10 + aChar - 'a';
break;
case 'A':
case 'B':
case 'C':
case 'D':
case 'E':
case 'F':
value = (value << 4) + 10 + aChar - 'A';
break;
default:
throw new IllegalArgumentException(
"Malformed \\uxxxx encoding.");
}
}
outBuffer.append((char) value);
} else {
if (aChar == 't')
aChar = '\t';
else if (aChar == 'r')
aChar = '\r';
else if (aChar == 'n')
aChar = '\n';
else if (aChar == 'f')
aChar = '\f';
outBuffer.append(aChar);
}
} else
outBuffer.append(aChar);
}
return outBuffer.toString();
}

二、普通string含有unicode转码方法

public static String reEncoding(String text, String newEncoding) {
String str = null;
try {
str = new String(text.getBytes(), newEncoding);
} catch (UnsupportedEncodingException e) {
log.error("不支持的字符编码" + newEncoding);
throw new RuntimeException(e);
}
return str;
}

三、说一下比较奇怪的方案，测试中无意发现的，暂时没弄明白原理（有明白原理的大神，请告知一声，谢谢）

我用HttpClent的post方式获取的json数据，得到的是带Unicode码的数据，需要转换成中文才行，但是转换的时间感觉有点长，就用HttpURLConnection的get方式又试了一下，在不转码的情况下，经过gson解析后，竟然神奇的自动转换成了中文：

简直是太神奇了，而且需要的时间相对于HttpClient的post请求方式的请求和处理时间更短，所以，果断换用HttpURLConnection的get方式了

①现在先贴一下HttpURLConnection的get的方式：

@Test
public void test() {
try {
long start = System.currentTimeMillis();
URL url = new URL("http://apis.baidu.com/songshuxiansheng/news/news");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.addRequestProperty("apikey","0fc807e45a37ce264f45d169646f4a9e" );
String dataString = new String(GsonTools.IsToByte(connection.getInputStream()),"utf-8");
HeadlineJson newsJson = GsonTools.getObjectData(dataString, HeadlineJson.class);
List<Headline>list = newsJson.getRetData();
System.out.println(list.toString());
long end = System.currentTimeMillis();
System.out.println("timeGap:"+(end-start));
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

调用的GsonTools的方法：（之前的博文中有写到过）

public static <T> T getObjectData(String jsonString, Class<T> type) {
T t = null;
try {
Gson gson = new Gson();
t = gson.fromJson(jsonString, type);
} catch (JsonSyntaxException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return t;
}

②然后贴一下HttpClient的post方式：

@Test
public void TestHeadLine() {
long start = System.currentTimeMillis();
List<NameValuePair> params = new ArrayList<NameValuePair>();
String url = "http://apis.baidu.com/songshuxiansheng/news/news";
String jsonString = HttpUtils.getBaiDuString2(url, params);
HeadlineJson lineJson = GsonTools.getObjectData(jsonString, HeadlineJson.class);
System.out.println(lineJson.toString());
long end = System.currentTimeMillis();
System.out.println("timeGap:"+(end-start));
}

调用的HttpUtils的方法：

public static String getBaiDuString(String url,List<NameValuePair> params) {
String serverDataString = null;
HttpPost post = new HttpPost(url);
try {
post.setEntity(new UrlEncodedFormEntity(params, HTTP.UTF_8));
post.addHeader("apikey", UrlUtils.BAIDU_API_KEY);
HttpClient client = new DefaultHttpClient();
HttpResponse response = client.execute(post);
int code = response.getStatusLine().getStatusCode();
System.out.println("StatusCode:" + code);
if (code == 200) {
serverDataString = decodeUnicode(EntityUtils.toString(response.getEntity()));
// serverDataString = EntityUtils.toString(response.getEntity());
System.out.println("接收字符串数据成功\nServerData:"+serverDataString);
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return serverDataString;
}

③调用的HttpClient的get方式

public static String getBaiDuString2(String url,List<NameValuePair> params) {
String serverDataString = null;
HttpGet get = new HttpGet(url);
try {get.addHeader("apikey", UrlUtils.BAIDU_API_KEY);
HttpClient client = new DefaultHttpClient();
HttpResponse response = client.execute(get);
int code = response.getStatusLine().getStatusCode();
System.out.println("StatusCode:" + code);
if (code == 200) {
// serverDataString = decodeUnicode(EntityUtils.toString(response.getEntity()));
serverDataString = EntityUtils.toString(response.getEntity());
System.out.println("接收字符串数据成功\nServerData:"+serverDataString);
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return serverDataString;
}