我在应用程序中使用Jooq，我正在使用比较器，我的代码就是这样的
public void columnsList(List<TableRecord> records){
Collections.sort(records, new StampDateComparator());
for(TableRecord record : records){
Table table = record.getTable();
Field[] fields = table.fields();
for(Field field : fields){
field.getName();
record.getValue(field);
}
}
}
和Comparator类方法是这样的
@Override
public int compare(Object o1, Object o2) {
try {
Date d1 = (Date) o1.getClass().getDeclaredField("StampDate").get(o1);
Date d2 = (Date) o2.getClass().getDeclaredField("StampDate").get(o2);
return compare(d1, d2);
} catch (SecurityException e) {
throw new RuntimeException(e);
} catch (NoSuchFieldException e) {
throw new RuntimeException("Missing variable stampDate");
}catch (ClassCastException e) {
throw new RuntimeException("stampDate is not a Date");
} catch (IllegalArgumentException e) {
//shoud not happen
throw new RuntimeException(e);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
}
但这行代码
Date d1 = (Date) o1.getClass().getDeclaredField("StampDate").get(o1);
java.lang.NoSuchFieldException：StampDate at java.lang.Class.getDeclaredField（未知来源）at com.csdcsystems.amanda.comp.macro.StampDateComparator.compare（StampDateComparator.java:13） at java.util.TimSort.countRunAndMakeAscending（Unknown Source）at java.util.TimSort.sort（未知来源）at java.util.TimSort.sort（未知来源）at java.util.Arrays.sort（未知来源）at java.util.Collections.sort（未知来源）
我在这里做错了什么？
您的参考o1包含类似此字段的字段
|PeopleRSN|NameTitle|NameFirst|NameLast|OrganizationName|AddrHouse|AddrStreet|AddrStreetType|AddrStreetDirection|AddrUnitType|AddrUnit|AddrCity|AddrProvince|AddrCountry|AddrPostal|Phone1|Phone1Desc|Phone2|Phone2Desc|LicenceNumber|PeopleCode|ContactSex|BirthDate|FamilyRSN|Comments|StampDate|StampUser|AddrPrefix|AddressLine1|AddressLine2|AddressLine3|AddressLine4|AddressLine5|AddressLine6|AddrHouseNumeric|Phone3|Phone3Desc|EmailAddress|NameFirstUpper|NameLastUpper|OrgNameUpper|AddrStreetUpper|AddrStreetPrefix|ParentRSN|SecurityCode|LogType|LogUser|LogDate|ReferenceFile|StatusCode|Nearby|Community|Phone4|Phone4Desc|InternetPassword|InternetAccess|LogDbDate|InternetRegistrationDate|STATUSTYPE|INTERNETQUESTION|INTERNETANSWER|CREDITCARDPROCESSINGFLAG|WEBDISPLAYFLAG|NameMiddle|NameSuffix|AddrCommunityCode|AddrCountyCode|NameMiddleUpper|SMSFlag|EmailFlag|NameLast1|AliasRSN|PeopleRoleType|PeopleRaceType|PeopleHairType|PeopleEyeType|SEX |Height|HeightInch|Weight|SocialSecurityNumber|LicenceNumberProvince|ConversionFlag|
| {null}|{null} |{null} |{null} |{null} |{null} |{null} |{null} |{null} |{null} |{null} |{null} |{null} |{null} |{null} |{null}|{null} |{null}|{null} |{null} | {null}|{null} |{null} | {null}|{null} |{null} |{null} |{null} |{null} |{null} |{null} |{null} |{null} |{null} | {null}|{null}|{null} |{null} |{null} |{null} |{null} |{null} |{null} | {null}| {null}|{null} |{null} |{null} |{null} | {null}|{null}|{null} |{null}|{null} |{null} |{null} |{null} |{null} |{null} |{null} |{null} |{null} |{null} |{null} |{null} | {null}| {null}|{null} |{null} |{null} |{null} | {null}|{null} |{null} |{null} |{null} |{null}|{null}| {null}|{null}|{null} |{null} |{null} |
修改： -
/**
* This class is generated by jOOQ.
*/
@java.lang.SuppressWarnings({ "all", "unchecked", "rawtypes" })
@javax.persistence.Entity
@javax.persistence.Table(name = "LogFolder", schema = "amanda")
public class LogFolderRecord extends org.jooq.impl.UpdatableRecordImpl<com.csdcsystems.schema.amanda.records.LogFolderRecord> {
private static final long serialVersionUID = -673142359;
/**
* Setter for <code>amanda.LogFolder.FolderRSN</code>.
*/
public void setFolderRSN(java.lang.Integer value) {
setValue(0, value);
}
/**
* Getter for <code>amanda.LogFolder.FolderRSN</code>.
*/
@javax.persistence.Id
@javax.persistence.Column(name = "FolderRSN", unique = true, nullable = false, precision = 10)
@javax.validation.constraints.NotNull
public java.lang.Integer getFolderRSN() {
return (java.lang.Integer) getValue(0);
}
/**
* Setter for <code>amanda.LogFolder.FolderYear</code>.
*/
public void setFolderYear(java.lang.String value) {
setValue(1, value);
}
/**
* Getter for <code>amanda.LogFolder.FolderYear</code>.
*/
@javax.persistence.Column(name = "FolderYear", nullable = false, length = 4)
@javax.validation.constraints.NotNull
@javax.validation.constraints.Size(max = 4)
public java.lang.String getFolderYear() {
return (java.lang.String) getValue(1);
}
/**
* Setter for <code>amanda.LogFolder.FolderSequence</code>.
*/
public void setFolderSequence(java.lang.String value) {
setValue(2, value);
}
/**
* Getter for <code>amanda.LogFolder.FolderSequence</code>.
*/
@javax.persistence.Column(name = "FolderSequence", nullable = false, length = 10)
@javax.validation.constraints.NotNull
@javax.validation.constraints.Size(max = 10)
public java.lang.String getFolderSequence() {
return (java.lang.String) getValue(2);
}
/**
* Setter for <code>amanda.LogFolder.FolderSection</code>.
*/
public void setFolderSection(java.lang.String value) {
setValue(3, value);
}
/**
* Getter for <code>amanda.LogFolder.FolderSection</code>.
*/
@javax.persistence.Column(name = "FolderSection", nullable = false, length = 3)
@javax.validation.constraints.NotNull
@javax.validation.constraints.Size(max = 3)
public java.lang.String getFolderSection() {
return (java.lang.String) getValue(3);
}
/**
* Setter for <code>amanda.LogFolder.FolderRevision</code>.
*/
public void setFolderRevision(java.lang.String value) {
setValue(4, value);
}
/**
* Getter for <code>amanda.LogFolder.FolderRevision</code>.
*/
@javax.persistence.Column(name = "FolderRevision", nullable = false, length = 2)
@javax.validation.constraints.NotNull
@javax.validation.constraints.Size(max = 2)
public java.lang.String getFolderRevision() {
return (java.lang.String) getValue(4);
}
/**
* Setter for <code>amanda.LogFolder.FolderType</code>.
*/
public void setFolderType(java.lang.String value) {
setValue(5, value);
}
/**
* Getter for <code>amanda.LogFolder.FolderType</code>.
*/
@javax.persistence.Column(name = "FolderType", length = 4)
@javax.validation.constraints.Size(max = 4)
public java.lang.String getFolderType() {
return (java.lang.String) getValue(5);
}
/**
* Setter for <code>amanda.LogFolder.StatusCode</code>.
*/
public void setStatusCode(java.lang.Integer value) {
setValue(6, value);
}
/**
* Getter for <code>amanda.LogFolder.StatusCode</code>.
*/
@javax.persistence.Column(name = "StatusCode", precision = 10)
public java.lang.Integer getStatusCode() {
return (java.lang.Integer) getValue(6);
}
/**
* Setter for <code>amanda.LogFolder.PropertyRSN</code>.
*/
public void setPropertyRSN(java.lang.Integer value) {
setValue(7, value);
}
/**
* Getter for <code>amanda.LogFolder.PropertyRSN</code>.
*/
@javax.persistence.Column(name = "PropertyRSN", precision = 10)
public java.lang.Integer getPropertyRSN() {
return (java.lang.Integer) getValue(7);
}
/**
* Setter for <code>amanda.LogFolder.PropertyLocation</code>.
*/
public void setPropertyLocation(java.lang.String value) {
setValue(8, value);
}
/**
* Getter for <code>amanda.LogFolder.PropertyLocation</code>.
*/
@javax.persistence.Column(name = "PropertyLocation", length = 255)
@javax.validation.constraints.Size(max = 255)
public java.lang.String getPropertyLocation() {
return (java.lang.String) getValue(8);
}
/**
* Setter for <code>amanda.LogFolder.InDate</code>.
*/
public void setInDate(java.sql.Timestamp value) {
setValue(9, value);
}
/**
* Getter for <code>amanda.LogFolder.InDate</code>.
*/
@javax.persistence.Column(name = "InDate")
public java.sql.Timestamp getInDate() {
return (java.sql.Timestamp) getValue(9);
}
/**
* Setter for <code>amanda.LogFolder.IssueDate</code>.
*/
public void setIssueDate(java.sql.Timestamp value) {
setValue(10, value);
}
/**
* Getter for <code>amanda.LogFolder.IssueDate</code>.
*/
@javax.persistence.Column(name = "IssueDate")
public java.sql.Timestamp getIssueDate() {
return (java.sql.Timestamp) getValue(10);
}
/**
* Setter for <code>amanda.LogFolder.ExpiryDate</code>.
*/
public void setExpiryDate(java.sql.Timestamp value) {
setValue(11, value);
}
/**
* Getter for <code>amanda.LogFolder.ExpiryDate</code>.
*/
@javax.persistence.Column(name = "ExpiryDate")
public java.sql.Timestamp getExpiryDate() {
return (java.sql.Timestamp) getValue(11);
}
/**
* Setter for <code>amanda.LogFolder.ReferenceFile</code>.
*/
public void setReferenceFile(java.lang.String value) {
setValue(12, value);
}
/**
* Getter for <code>amanda.LogFolder.ReferenceFile</code>.
*/
@javax.persistence.Column(name = "ReferenceFile", length = 100)
@javax.validation.constraints.Size(max = 100)
public java.lang.String getReferenceFile() {
return (java.lang.String) getValue(12);
}
/**
* Setter for <code>amanda.LogFolder.IssueUser</code>.
*/
public void setIssueUser(java.lang.String value) {
setValue(13, value);
}
/**
* Getter for <code>amanda.LogFolder.IssueUser</code>.
*/
@javax.persistence.Column(name = "IssueUser", length = 128)
@javax.validation.constraints.Size(max = 128)
public java.lang.String getIssueUser() {
return (java.lang.String) getValue(13);
}
/**
* Setter for <code>amanda.LogFolder.FinalDate</code>.
*/
public void setFinalDate(java.sql.Timestamp value) {
setValue(14, value);
}
/**
* Getter for <code>amanda.LogFolder.FinalDate</code>.
*/
@javax.persistence.Column(name = "FinalDate")
public java.sql.Timestamp getFinalDate() {
return (java.sql.Timestamp) getValue(14);
}
/**
* Setter for <code>amanda.LogFolder.SubCode</code>.
*/
public void setSubCode(java.lang.Integer value) {
setValue(15, value);
}
/**
* Getter for <code>amanda.LogFolder.SubCode</code>.
*/
@javax.persistence.Column(name = "SubCode", precision = 10)
public java.lang.Integer getSubCode() {
return (java.lang.Integer) getValue(15);
}
/**
* Setter for <code>amanda.LogFolder.WorkCode</code>.
*/
public void setWorkCode(java.lang.Integer value) {
setValue(16, value);
}
/**
* Getter for <code>amanda.LogFolder.WorkCode</code>.
*/
@javax.persistence.Column(name = "WorkCode", precision = 10)
public java.lang.Integer getWorkCode() {
return (java.lang.Integer) getValue(16);
}
/**
* Setter for <code>amanda.LogFolder.FolderDescription</code>.
*/
public void setFolderDescription(java.lang.String value) {
setValue(17, value);
}
/**
* Getter for <code>amanda.LogFolder.FolderDescription</code>.
*/
@javax.persistence.Column(name = "FolderDescription", length = 2147483647)
@javax.validation.constraints.Size(max = 2147483647)
public java.lang.String getFolderDescription() {
return (java.lang.String) getValue(17);
}
/**
* Setter for <code>amanda.LogFolder.FolderCondition</code>.
*/
public void setFolderCondition(java.lang.String value) {
setValue(18, value);
}
/**
* Getter for <code>amanda.LogFolder.FolderCondition</code>.
*/
@javax.persistence.Column(name = "FolderCondition", length = 2147483647)
@javax.validation.constraints.Size(max = 2147483647)
public java.lang.String getFolderCondition() {
return (java.lang.String) getValue(18);
}
/**
* Setter for <code>amanda.LogFolder.ParentRSN</code>.
*/
public void setParentRSN(java.lang.Integer value) {
setValue(19, value);
}
/**
* Getter for <code>amanda.LogFolder.ParentRSN</code>.
*/
@javax.persistence.Column(name = "ParentRSN", precision = 10)
public java.lang.Integer getParentRSN() {
return (java.lang.Integer) getValue(19);
}
/**
* Setter for <code>amanda.LogFolder.CopyFlag</code>.
*/
public void setCopyFlag(com.csdcsystems.schema.custom.CopyFlag value) {
setValue(20, value);
}
/**
* Getter for <code>amanda.LogFolder.CopyFlag</code>.
*/
@javax.persistence.Column(name = "CopyFlag", length = 7)
public com.csdcsystems.schema.custom.CopyFlag getCopyFlag() {
return (com.csdcsystems.schema.custom.CopyFlag) getValue(20);
}
/**
* Setter for <code>amanda.LogFolder.StampDate</code>.
*/
public void setStampDate(java.sql.Timestamp value) {
setValue(21, value);
}
/**
* Getter for <code>amanda.LogFolder.StampDate</code>.
*/
@javax.persistence.Column(name = "StampDate")
public java.sql.Timestamp getStampDate() {
return (java.sql.Timestamp) getValue(21);
}
答案 0 :(得分：3)
getDeclaredField是Java Reflection API的方法部分，其目的是找到一个 java字段（又名实例属性）在您查询字段的特定类中定义，与getField相反，它将尝试在整个类层次结构中查找指定的字段。
如果您的班级TableRecord定义如下，您就会使用它：
public class TableRecord {
public Date StampDate;
// other fields
}
但是，正如您的代码所示，您正在寻找其他内容。 您的班级TableRecord没有名为StampDate的字段，而是有一个名为stampDate 的媒体资源。这里有两种方法，一种可以使用Introspection，另一种可以使用Reflection但是获取方法getStampDate而不是字段。
使用Introspection，您可以执行以下操作：
BeanInfo bi = Introspector.getBeanInfo(o1.getClass());
PropertyDescriptor[] properties = bi.getPropertyDescriptors();
// iterate over 'properties' and look for a property named 'stampDate'
// you then need to do the following
Date stampDate = (Date) stampDateProperty.getReadMethod().invoke(o1);
使用反射（可能更容易，因为你已经到了一半）：
Method method = o1.getClass().getDeclaredMethod("getStampDate");
Date value = (Date) method.invoke(o1);
供参考，请查看JavaBeans spec。
答案 1 :(得分：1)
getClass().getDeclaredField用于反复获取field的值。声明
Date d1 = (Date) o1.getClass().getDeclaredField("StampDate").get(o1);
将返回字段StampDate的值。因为它正在抛出java.lang.NoSuchFieldException，这意味着该字段不存在于类中或存在拼写错误。尝试将StampDate更改为stampDate。
getDeclaredField给出当前类（不是任何基类）中声明的所有字段，getField给出整个类层次结构中的所有公共字段。如果在任何超类中声明了StampDate，则可以使用getField来访问它。
答案 2 :(得分：0)
您正试图获取一个不存在的字段。