struts2.0问题

struts2.0问题 [已结贴,结贴人:zr_dixuexiongying]

zr_dixuexiongying
等级:

发表于：2008-06-22 10:44:36 楼主

package org.apache.struts2.showcase;

public class UITagExample extends ActionSupport implements Validateable
{
private static final long serialVersionUID =1L;

String name;
Date birthday;
String bio;
String favoriteColor;
List friends;
boolean legalAge;
String state;
String region;
File picture;
String pictureContentType;
String pictureFileName;
String favouriteLanguage;
String favouriteVehicalType = "MotorcycleKey";
String favouriteVehicalSpecific = "YamahaKey";
List leftSideCartoonCharacters;
List rightSideCartoonCharacters;
List favouriteLanguages = new ArrayList();
List vehicalTypeList = new ArrayList();
Map vehicalSpecificMap = new HashMap();
String thoughts;
public UITagExample()
{
favouriteLanguages.add(new Language("EnglishKey","English Language"));
favouriteLanguages.add(new Language("Frenchkey","French Language"));
favouriteLanguages.add(new Language("SpanishKey","Spanish Language"));

VehicalType car = new VehicalType("CarKey","Car");
VehicalType motorcycle = new VehicalType("MotorcycleKey","Motorcycle");
vehicalTypeList.add(car);
vehicalTypeList.add(motorcycle);

List cars = new ArrayList();
cars.add(new VehicalSpecific("MercedesKey","Mercedes"));
cars.add(new VehicalSpecific("HondaKey","Honda"));
cars.add(new VehicalSpecific("FordKey","Ford"));

List motorcycles = new ArrayList();
motorcycles.add(new VehicalSpecific("SuzukiKey","Suzuki"));
motorcycles.add(new VehicalSpecific("YamahaKey","Yamahs"));

vehicalSpecificMap.put(car, cars);
vehicalSpecificMap.put(motorcycle, motorcycles);
}

public String getFavouriteVehicalType() {
return favouriteVehicalType;
}

public void setFavouriteVehicalType(String favouriteVehicalType) {
this.favouriteVehicalType = favouriteVehicalType;
}

public String getFavouriteVehicalSpecific() {
return favouriteVehicalSpecific;
}

public void setFavouriteVehicalSpecific(String favouriteVehicalSpecific) {
this.favouriteVehicalSpecific = favouriteVehicalSpecific;
}

public List getLeftSideCartoonCharacters() {
return leftSideCartoonCharacters;
}

public void setLeftSideCartoonCharacters(List leftSideCartoonCharacters) {
this.leftSideCartoonCharacters = leftSideCartoonCharacters;
}

public List getRightSideCartoonCharacters() {
return rightSideCartoonCharacters;
}

public void setRightSideCartoonCharacters(List rightSideCartoonCharacters) {
this.rightSideCartoonCharacters = rightSideCartoonCharacters;
}

public List getVehicalTypeList() {
return vehicalTypeList;
}

public List getVehicalSpecificList()
{
OgnlValueStack stack = ServletActionContext.getValueStack( //本行报错
ServletActionContext.getRequest());

Object vehicalType = stack.findValue("top");

if(vehicalType != null && vehicalType instanceof VehicalType)
{
List l = (List)vehicalSpecificMap.get(vehicalType);
return l;

}
return Collections.EMPTY_LIST;
}

public List getFavouriteLanguages()
{
return favouriteLanguages;
}

public String execute() throws Exception
{
return SUCCESS;
}

public String doSubmit()
{
return SUCCESS;
}

public static class Language
{
String description;
String key;

public Language(String key,String description)
{
this.key = key;
this.description = description;
}

public String getKey()
{
return key;
}

public String getDescription()
{
return description;
}
}

public static class VehicalType
{
String key;
String description;

public VehicalType(String key,String description)
{
this.key = key;
this.description = description;
}

public String getKey()
{
return this.key;
}

public String getDescription()
{
return this.description;
}

public boolean equals(Object obj)
{
if(!(obj instanceof VehicalType))
{
return false;
}
else
{
return key.equals(((VehicalType)obj).getKey());
}
}

public int hashCode()
{
return key.hashCode();
}
}

public static class VehicalSpecific
{
String key;
String description;

public VehicalSpecific(String key,String description)
{
this.key = key;
this.description = description;
}

public String getKey()
{
return this.key;
}

public String getDescription()
{
return this.description;
}

public boolean equals(Object obj)
{
if(!(obj instanceof VehicalSpecific))
{
return false;
}
else
{
return key.equals(((VehicalSpecific)obj).getKey());
}
}

public int hashCode()
{
return key.hashCode();
}
}
}

报错提示为:

Severity and Description Path Resource Location Creation Time Id
Type mismatch: cannot convert from ValueStack to OgnlValueStack TestStruts2/src/org/apache/struts2/showcase UITagExample.java line 107

鼠标指着报错的地方提示:
Multiple markers at this line
- Line breakpoint:UITagExample [line:107] - setFavouriteVehicalType(String)
- Type mismatch:cannot convert from ValueStack to OgnlValueStack

107行也就是:OgnlValueStack stack = ServletActionContext.getValueStack(
ServletActionContext.getRequest());

可是我的代码全部是照着电子资料写的啊:不明白什么错误,说不能转换,不知道怎么改

资料代码如下:
与大家分享一个来Struts 2.0 Show Case一个例子。
package org.apache.struts2.showcase;
public class UITagExample extends ActionSupport implements Validateable {

public List getVehicalSpecificList() {
OgnlValueStack stack = ServletActionContext.getValueStack(ServletActionContext.getRequest());
Object vehicalType = stack.findValue("top");
if (vehicalType != null && vehicalType instanceof VehicalType) {
List l = (List) vehicalSpecificMap.get(vehicalType);
return l;
}
return Collections.EMPTY_LIST;
}
}

问题点数：50 回复次数：4 修改删除举报引用回复