我遇到了关于json字符串的问题,我使用Apache http客户端获取,包含德语变音符号。
如果字符串不包含任何德语变音符号,则json字符串的映射仅起作用,否则我得到“JsonMappingException:无法反序列化START_ARRAY中的[...]实例。”
Apache http客户端使用“Accept-Charset”设置为HTTP.UTF-8,但结果我总是得到例如“\ u00fc”而不是“ü”。我手动更换时,例如“\ u00fc”与“ü”的映射效果很好。
如何从Apache http客户端获取utf-8编码的json响应? 或服务器输出问题?
params.setParameter(HttpProtocolParams.USE_EXPECT_CONTINUE, false);
HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);
HttpProtocolParams.setContentCharset(params, HTTP.UTF_8);
httpclient = new DefaultHttpClient(params);
httpclient = new DefaultHttpClient(params);
HttpGet httpGetContentLoad = new HttpGet(url);
httpGetContentLoad.setHeader("Accept-Charset", "utf-8");
httpGetContentLoad.setParams(params);
response = httpclient.execute(httpGetContentLoad);
entity = response.getEntity();
String loadedContent = null;
if (entity != null)
{
loadedContent = EntityUtils.toString(entity, HTTP.UTF_8);
entity.consumeContent();
}
if (HttpStatus.SC_OK != response.getStatusLine().getStatusCode())
{
throw new Exception("Loading content failed");
}
closeConnection();
return loadedContent;
这里映射了json代码:
String jsonMetaData = loadGetRequestContent(getLatestEditionUrl(newspaperEdition));
Newspaper loadedNewspaper = mapper.readValue(jsonMetaData, Newspaper.class);
loadedNewspaper.setEdition(newspaperEdition);
更新1: JsonMetaData是包含所提取的json代码的String类型。
UPDATE2:
我用这个代码将json输出转换为我需要:
public static String convertJsonLatestEditionMeta(String jsonCode)
{
jsonCode = jsonCode.replaceFirst("\\[\"[A-Za-z0-9-[:blank:]]+\",\\{", "{\"edition\":\"an-a1\",");
jsonCode = jsonCode.replaceFirst("\"pages\":\\{", "\"pages\":\\[");
jsonCode = Helper.replaceLast(jsonCode, "}}}]", "}]}");
jsonCode = jsonCode.replaceAll("\"[\\d]*\"\\:\\{\"", "\\{\"");
return jsonCode;
}
UPDATE3: Json转换示例:
转换前的jsoncode:
["Newspaper title",
{
"date":"20130103",
"pages":
{
"1": {"ressort":"ressorttitle1","pdfpfad":"pathToPdf1","number":1,"size":281506},
"2":{"ressort":"ressorttitle2","pdfpfad":"pathToPdf2","number":2,"size":281533},
[...]
}
}
]
转换后的Jsoncode:
{
"edition":"Newspaper title",
"date":"20130103",
"pages":
[
{"ressort":"Resorttitle1","pdfpfad":"pathToPdf1","number":1,"size":281506},
{"ressort":"Resorttitle2","pdfpfad":"pathToPdf2","number":2,"size":281533},
[...]
]
}
解决方案: 我开始使用GSON作为@Boris建议,关于变音符号的问题消失了!更多的GSON似乎比Jackson Json更快。
解决方法是在此表后手动替换字符:
Sign Unicode representation
Ä, ä \u00c4, \u00e4
Ö, ö \u00d6, \u00f6
Ü, ü \u00dc, \u00fc
ß \u00df
€ \u20ac
答案 0 :(得分:2)
尝试解析:
entity = response.getEntity();
Newspaper loadedNewspaper=mapper.readValue(entity.getContent(), Newspaper.class);
没有理由通过String
,杰克逊直接解析InputStream
。如果您使用我提出的方法,杰克逊也会自动检测编码。
编辑顺便考虑使用GSON JSON解析库。它比杰克逊更快,更容易使用。然而,杰克逊最近也开始解析XMl,这是一种美德。
EDIT2 毕竟你已经添加了详细信息我认为问题出在服务器的服务器实现上 - 变音符号不能在json中进行unicode转义 - UTF 8是本机编码它。为什么不通过正则表达式代替manually replace e.g. "\u00fc" with "ü"
?