java 将 Map 转换为 QueryString
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Convert Map to QueryString
提问by zen0n
Possible Duplicate:
How to convert map to url query string?
可能重复：
如何将地图转换为 url 查询字符串？
How to convert Map to query string?
如何将 Map 转换为查询字符串？
For example:
例如：
MockHttpServletRequest request = getRequest();
HashMap<String, String> queryString = new HashMap<String, String>();
queryString.put("IDcontent", "4546446");
queryString.put("ID_CP", "604204d6-3ded-4882-9427-52f1ff8ee6c8");
request.setQueryString(mapToQueryString(queryString));
I think that is this(mapToQueryString) to do standart library, but I can't find it.
我认为这是（mapToQueryString）做标准库，但我找不到它。
回答by ControlPower
You can define a method mapToueryString by yourself as:
您可以自己定义一个方法 mapToueryString 为：
StringBuilder sb = new StringBuilder();
for(HashMap.Entry<String, String> e : queryString.entrySet()){
if(sb.length() > 0){
sb.append('&');
}
sb.append(URLEncoder.encode(e.getKey(), "UTF-8")).append('=').append(URLEncoder.encode(e.getValue(), "UTF-8"));
}
回答by MasterCassim
public String mapToQueryString(Map<String, String> map) {
StringBuilder string = new StringBuilder();
if(map.size() > 0) {
string.append("?");
}
for(Entry<String, String> entry : map.entrySet()) {
string.append(entry.getKey());
string.append("=");
string.append(entry.getValue());
string.append("&");
}
return string.toString();
}
or use URLEncodeUtils.format()with Collections2.transform(paramMap.entrySet(), function)to transform.
或使用URLEncodeUtils.format()withCollections2.transform(paramMap.entrySet(), function)进行变换。
