如何在ParameterMap(Spring)中获取Key值列表

时间:2013-06-21 06:31:33

标签: java spring map

我有一个在不同场景中具有完全不同参数的ParameterMap集

我需要的是ParameterMap

中的“键”字符串数组

我最接近的是使用reportParams.toString(); 这是我以前得到的输出

ParameterMap reportParams = context.getRequestParameters();
System.out.println(reportParams.toString());

//输出

map ['username' - > 'user','decorate' - > '不','装饰' - > '空','ajax' - > 'true','_ eventId' - > 'refreshReport','VEFactorSelection' - > '1','campusAndFaculty' - > array ['111','113','115','118','112','114','116','117','21907','21908','99040','99010', '99100','99230','99240'],'_ flowExecutionKey' - > 'e4s1','reportLanguage' - > '3','日期' - > '2013/06/20','nameType2' - > '1','确认' - > '真']

所以我想要的最终结果是

username,decorate,decorator,ajax,_ecentId,VEFactorSelection,campusAndFaculty,_flowExecutionKey,reportLanguage,date,nameType2,confirm

我试过这个

ParameterMap reportParams = context.getRequestParameters();

final List<String> names = new ArrayList<String>();

for (final Object o: reportParams.asMap().keySet())
names.add((String) o);

final String[] array = names.toArray(new String[names.size()]);

System.out.println(array[0]); // this part is just to see if i get output

上述代码的最终结果:

=================================== org.springframework.beans.ConversionNotSupportedException:无法转换属性类型'java.util.LinkedHashMap'的值为必需类型'org.hibernate.mapping.Map'的属性'readOnlyConfiguredExporters';嵌套异常是java.lang.IllegalStateException:无法将类型[java.util.LinkedHashMap]的值转换为属性“readOnlyConfiguredExporters”所需的类型[org.hibernate.mapping.Map]:找不到匹配的编辑器或转换策略

===============================一些额外的

以下是“ParameterMap”http://static.springsource.org/spring-webflow/docs/1.0.x/api/org/springframework/webflow/core/collection/ParameterMap.html

的API

2 个答案:

答案 0 :(得分:1)

这样做

     Map<String, String> result = new LinkedHashMap<String, String>(parameterMap.size());
            for (Map.Entry<String, String[]> entry : parameterMap.entrySet()) {
                if (entry.getValue().length > 0) {
                    result.put(entry.getKey(), entry.getValue()[0]);
                }
            }

Set<String> nameSet = result.keySet();
String[] namesHolder= new String[nameSet.size()];
nameSet.toArray(namesHolder);

你在namesHolder

中拥有它

编辑回答。试试这个

答案 1 :(得分:0)

你试过了吗?

ParameterMap reportParams = context.getRequestParameters();
Set<String> keys = reportParams.asMap().keySet();