您能看到保存时所选值不会返回的原因是什么？
<form:select class="multiselect" multiple="true" path="conversionPixels">
<form:options path="conversionPixels" items="${CONVERSION_PIXELS.getItems()}" itemValue="uniqueCode" itemLabel="displayName" />
</form:select>
@Controller
public class EditController extends BaseController {
@RequestMapping(method = RequestMethod.POST, value = "/edit/save.htm")
public RedirectView save(@ModelAttribute("package") Package package,
BindingResult bindingResult, RedirectAttributes redirectAttributes,
HttpSession session) {
if (!bindingResult.hasErrors()) {
if(package.getConversionPixels()!=null){
for (Object o : package.getConversionPixels()) {
logger.debug("*****************EditController Save other type "+o.getClass());
WadConversionPixels w= (WadConversionPixels)o;
logger.debug("****************** w.getId()"+w.getId());
logger.debug("****************** w.getConversionPixel().getId()"+w.getConversionPixel().getId());
}
}
} else {
ErrorMessageCollector errors = new BindValidateErrorCollector(
bindingResult);
MessageDisplayHelper.addDisplayMessagesToRedirect(errors,
redirectAttributes);
return new RedirectView("/edit/display.htm", true);
}
}
@InitBinder
public void initBinder(WebDataBinder binder) {
binder.registerCustomEditor(String.class, new TextPropertyEditor());
binder.registerCustomEditor(CostMethodLookupItem.class, new LookupItemPropertyEditor(CostMethodLookupTableCode.COST_METHOD, lookupTableService));
//binder.registerCustomEditor(ConversionPixelsLookupItem.class, new LookupItemPropertyEditor(ConversionPixelsLookupTableCode.CONVERSION_PIXELS, lookupTableService));
//binder.registerCustomEditor(ConversionPixelsLookupItem.class, new LookupItemPropertyEditor(ConversionPixelLookupTableCode.CONVERSION_PIXEL, lookupTableService));
binder.setDisallowedFields(new String[] {"conversionPixels"});
binder.registerCustomEditor(Set.class, "conversionPixels",
new CustomCollectionEditor(Set.class) {
protected Object convertElement(Object element) {
if (element instanceof ConversionPixelsLookupItem) {
System.out
.println("Converting from ConversionPixelsLookupItem to WadConversionPixels: "
+ element);
WadConversionPixels wadConPixel = new WadConversionPixels();
wadConPixel
.setConversionPixel((ConversionPixelsLookupItem) element);
return ((ConversionPixelsLookupItem) element)
.getUniqueCode();
}
if (element instanceof WadConversionPixels) {
System.out
.println("Converting from WadConversionPixels to WadConversionPixels: "
+ element);
return element;
}
if (element instanceof String) {
String lookupCode = (String) element;
ConversionPixelsLookupItem item = (ConversionPixelsLookupItem) lookupTableService
.readLookupTable(
ConversionPixelsLookupTableCode.CONVERSION_PIXELS)
.findLookupItemForCode(lookupCode);
WadConversionPixels wadConPixel = new WadConversionPixels();
wadConPixel.setConversionPixel(item);
System.out.println("Looking up staff for id "
+ lookupCode + ": " + item);
return (String) element;// wadConPixel;
}
System.out.println("Don't know what to do with: "
+ element);
return null;
}
});
}
}
@Entity
@Table(name = "Ad_Packages")
@SequenceGenerator(name = "Package_id_seq", sequenceName = "AD_PACKAGE_SEQ", allocationSize = 1)
public class Package extends TransactionalEntity {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "Package_id_seq")
@Column(name = "Ad_Package_ID")
private Integer id;
@OneToMany(fetch = FetchType.LAZY, cascade = CascadeType.ALL, mappedBy = "package", orphanRemoval = true)
private Set<WadConversionPixels> conversionPixels;
public Set<WadConversionPixels> getConversionPixels() {
return conversionPixels;
}
public void setConversionPixels(Set<WadConversionPixels> conversionPixels) {
this.conversionPixels = conversionPixels;
}
}
@Entity
@Table(name = "Ad_Package_Actions")
@SequenceGenerator(name = "wad_package_action_id_seq", sequenceName = "AD_PACKAGE_ACTION_SEQ", allocationSize = 1)
public class WadConversionPixels {
private static final long serialVersionUID = 1L;
@Id
@GeneratedValue(strategy = GenerationType.SEQUENCE, generator = "wad_package_action_id_seq")
@Column(name = "AD_PACKAGE_ACTION_ID")
private Integer id;
@JoinColumn(name = "AD_PACKAGE_ID", referencedColumnName = "AD_PACKAGE_ID")
@ManyToOne(fetch = FetchType.LAZY, optional = false )
private Package package;
@ManyToOne(optional = false)
@JoinColumn(name = "CONVERSION_PIXEL_ID", nullable = false)
private ConversionPixelsLookupItem conversionPixel;
public Package getPackage() {
return package;
}
public void setPackage(Package package) {
this.package = package;
}
public ConversionPixelsLookupItem getConversionPixel() {
return conversionPixel;
}
public void setConversionPixel(ConversionPixelsLookupItem conversionPixel) {
this.conversionPixel = conversionPixel;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
}
@Entity
@Table(name = "PIXELS")
public class ConversionPixelsLookupItem implements LookupItem {
public ConversionPixelsLookupItem() {};
public ConversionPixelsLookupItem(String uniqueCode, String displayName) {
this.uniqueCode = uniqueCode;
this.displayName = displayName;
}
@SuppressWarnings("unused")
@Id
@Column(name = "CONVERSION_PIXEL_ID")
private Integer id;
@Column(name="CONVERSION_PIXEL_DESCRIPTION", insertable = false, updatable = false)
private String uniqueCode;
@Column(name="CONVERSION_PIXEL_DESCRIPTION", insertable = false, updatable = false)
private String displayName;
@Type(type = "yes_no")
@Column(name = "IS_ACTIVE")
private boolean active;
@Column(name = "Product_Line_Code")
private String prodLine;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getProdLine() {
return prodLine;
}
public void setProdLine(String prodLine) {
this.prodLine = prodLine;
}
public String getUniqueCode() {
return uniqueCode;
}
public void setUniqueCode(String uniqueCode) {
this.uniqueCode = uniqueCode;
}
public String getDisplayName() {
return displayName;
}
public void setDisplayName(String displayName) {
this.displayName = displayName;
}
public boolean isActive() {
return active;
}
public void setActive(boolean active) {
this.active = active;
}
}
答案 0 :(得分：0)
您需要创建转换服务并使用以下命令将其设置为使用MVC
<annotation-driven validator="validator" conversionService = "conversionService" />
有关转换类，请参阅第7.5节：
http://docs.spring.io/spring-framework/docs/3.2.x/spring-framework-reference/html/validation.html
编辑：
有关详细信息，请参阅链接 - 第7.5节 - 这是摘录：
用于实现类型转换逻辑的SPI简单且强类型化：
package org.springframework.core.convert.converter;
public interface Converter<S, T> {
T convert(S source);
}
要创建自己的Converter，只需实现上面的界面即可。将S作为要转换的类型参数化，将T作为要转换的类型。对于每次转换（S）的调用，源参数保证为非null。如果转换失败，您的Converter可能会抛出任何异常。应抛出IllegalArgumentException以报告无效的源值。注意确保您的Converter实现是线程安全的。 为方便起见，core.convert.support包中提供了几个转换器实现。这些包括从字符串到数字的转换器和其他常见类型。将StringToInteger视为示例转换器实现：
package org.springframework.core.convert.support;
final class StringToInteger implements Converter<String, Integer> {
public Integer convert(String source) {
return Integer.valueOf(source);
}
}