有没有Java方法将参数集合编码为URL查询组件? [英] Is there a Java method that encodes a collection of parameters as a URL query component?
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问题描述
HttpParams params = new BasicHttpParams()
.setParameter(foo,bar )
.setParameter(thud,grunt);
UnknownLibrary.toQueryString(params);
应该产生foo = bar& thud = grunt。
我知道这不难写,但似乎应该已经写过了。我只是找不到它。
解决方案
我最终写了我自己的。它可以像
URIUtils.withQuery(uri,param1,value1,param2,value2 );
这不是很糟糕。
/ **
*连接< code> uri< / code>具有从
*< code> params< / code> ;.生成的查询字符串。
*
* @param uri基本URI
* @param params a< code> Map< / code>键/值对
* @返回一个新的< code> URI< / code>
* /
public static URI withQuery(URI uri,Map< String,String> params){
StringBuilder query = new StringBuilder();
char separator ='?';
for(Entry< String,String> param:params.entrySet()){
query.append(separator);
separator ='&';
try {
query.append(URLEncoder.encode(param.getKey(),UTF-8));
if(!StringUtils.isEmpty(param.getValue())){
query.append('=');
query.append(URLEncoder.encode(param.getValue(),UTF-8));
}
} catch(UnsupportedEncodingException e){
throw new RuntimeException(e);
}
}
返回URI.create(uri.toString()+ query.toString());
}
/ **
*连接< code> uri< / code>具有从
*< code> params< / code> ;.生成的查询字符串。 < code> params< / code>的成员将
*解释为{key1,val1,key2,val2}。空值可以被赋予
* as< code>< / code>或< code> null< / code> ;.
*
* @param uri基本URI
* @param按顺序对键/值对进行参数
* @返回一个新的< code> URI< / code>
* /
public static URI withQuery(URI uri,String ... params){
Map< String,String> map = new LinkedHashMap< String,String>(); (int i = 0; i< params.length; i + = 2)
{
String key = params [i];
String val = i + 1< params.length? params [i + 1]:;
map.put(key,val);
}
返回withQuery(uri,map);
}
Is there a widely-used Java library that does something like what dojo.objectToQuery() does? E.g. (assuming the use of HttpCore's HttpParams object, but any key-value mapping will do):
HttpParams params = new BasicHttpParams()
.setParameter("foo", "bar")
.setParameter("thud", "grunt");
UnknownLibrary.toQueryString(params);
should yield "foo=bar&thud=grunt".
I know it's not hard to write but it seems like it should have already been written. I just can't find it.
解决方案
I ended up writing my own. It can be called like
URIUtils.withQuery(uri, "param1", "value1", "param2", "value2");
which isn't so bad.
/**
* Concatenates <code>uri</code> with a query string generated from
* <code>params</code>.
*
* @param uri the base URI
* @param params a <code>Map</code> of key/value pairs
* @return a new <code>URI</code>
*/
public static URI withQuery(URI uri, Map<String, String> params) {
StringBuilder query = new StringBuilder();
char separator = '?';
for (Entry<String, String> param : params.entrySet()) {
query.append(separator);
separator = '&';
try {
query.append(URLEncoder.encode(param.getKey(), "UTF-8"));
if (!StringUtils.isEmpty(param.getValue())) {
query.append('=');
query.append(URLEncoder.encode(param.getValue(), "UTF-8"));
}
} catch (UnsupportedEncodingException e) {
throw new RuntimeException(e);
}
}
return URI.create(uri.toString() + query.toString());
}
/**
* Concatenates <code>uri</code> with a query string generated from
* <code>params</code>. The members of <code>params</code> will be
* interpreted as {key1, val1, key2, val2}. Empty values can be given
* as <code>""</code> or <code>null</code>.
*
* @param uri the base URI
* @param params the key/value pairs in sequence
* @return a new <code>URI</code>
*/
public static URI withQuery(URI uri, String... params) {
Map<String, String> map = new LinkedHashMap<String, String>();
for (int i = 0; i < params.length; i += 2) {
String key = params[i];
String val = i + 1 < params.length ? params[i + 1] : "";
map.put(key, val);
}
return withQuery(uri, map);
}
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