我有一个定义了POST处理程序的控制器，如下所示：
@RequestMapping(value="/ajax/saveVendor.do", method = RequestMethod.POST) public @ResponseBody AjaxResponse saveVendor( @Valid UIVendor vendor, BindingResult result, Locale currentLocale )
以JSON格式查看时，UIVendor对象如下所示：
var vendor = { vendorId: 123, vendorName: "ABC Company", emails : [ { emailAddress: "abc123@abc.com", flags: 2 }, { emailAddress: "xyz@abc.com", flags: 3 } ] }
UIVendor bean具有一个ArrayList类型的名为“ Emails”的字段，带有适当的设置器和获取器（getEmails / setEmails）。NotificationEmail对象也具有适当的公共设置器/获取器。
当我尝试使用以下代码发布对象时：
$.post("ajax/saveVendor.do", $.param(vendor), saveEntityCallback, "json" );
我在日志中收到此错误：
Invalid property 'emails[0][emailAddress]' of bean class [beans.UIVendor]: Property referenced in indexed property path 'emails[0][emailAddress]' is neither an array nor a List nor a Map; returned value was [abc123@abc.com]
我如何正确地将这样的嵌套对象发布到Spring控制器，并将其正确反序列化为适当的对象结构。
UPDATE 根据Bohzo的请求，这是UIVendor类的内容。此类包装由Web服务生成的Bean类，将VendorAttributes公开为单独的字段：
package com.mycompany.beans; import java.util.*; import org.apache.commons.lang.*; import com.mycompany.domain.Vendor; import com.mycompany.domain.VendorAttributes; import org.apache.commons.logging.*; import org.codehaus.jackson.annotate.JsonIgnore; public class UIVendor { private final Log logger = LogFactory.getLog( this.getClass() ); private Vendor vendor; private boolean ftpFlag; private String ftpHost; private String ftpPath; private String ftpUser; private String ftpPassword; private List<UINotificationEmail> emails = null; public UIVendor() { this( new Vendor() ); } public UIVendor( Vendor vendor ) { this.vendor = vendor; loadVendorAttributes(); } private void loadVendorAttributes() { this.ftpFlag = false; this.ftpHost = this.ftpPassword = this.ftpPath = this.ftpUser = ""; this.emails = null; for ( VendorAttributes a : this.vendor.getVendorAttributes() ) { String key = a.getVendorFakey(); String value = a.getVendorFaValue(); int flags = a.getFlags(); if ( StringUtils.isBlank(key) || StringUtils.isBlank(value) ) continue; if ( key.equals( "ftpFlag" ) ) { this.ftpFlag = BooleanUtils.toBoolean( value ); } else if ( key.equals( "ftpHost" ) ) { this.ftpHost = value; } else if ( key.equals("ftpPath") ) { this.ftpPath = value; } else if ( key.equals("ftpUser") ) { this.ftpUser = value; } else if ( key.equals("ftpPassword") ) { this.ftpPassword = value; } else if ( key.equals("email") ) { UINotificationEmail email = new UINotificationEmail(value, flags); this.getEmails().add( email ); } } } private void saveVendorAttributes() { int id = this.vendor.getVendorId(); List<VendorAttributes> attrs = this.vendor.getVendorAttributes(); attrs.clear(); if ( this.ftpFlag ) { VendorAttributes flag = new VendorAttributes(); flag.setVendorId( id ); flag.setStatus( "A" ); flag.setVendorFakey( "ftpFlag" ); flag.setVendorFaValue( BooleanUtils.toStringTrueFalse( this.ftpFlag ) ); attrs.add( flag ); if ( StringUtils.isNotBlank( this.ftpHost ) ) { VendorAttributes host = new VendorAttributes(); host.setVendorId( id ); host.setStatus( "A" ); host.setVendorFakey( "ftpHost" ); host.setVendorFaValue( this.ftpHost ); attrs.add( host ); if ( StringUtils.isNotBlank( this.ftpPath ) ) { VendorAttributes path = new VendorAttributes(); path.setVendorId( id ); path.setStatus( "A" ); path.setVendorFakey( "ftpPath" ); path.setVendorFaValue( this.ftpPath ); attrs.add( path ); } if ( StringUtils.isNotBlank( this.ftpUser ) ) { VendorAttributes user = new VendorAttributes(); user.setVendorId( id ); user.setStatus( "A" ); user.setVendorFakey( "ftpUser" ); user.setVendorFaValue( this.ftpUser ); attrs.add( user ); } if ( StringUtils.isNotBlank( this.ftpPassword ) ) { VendorAttributes password = new VendorAttributes(); password.setVendorId( id ); password.setStatus( "A" ); password.setVendorFakey( "ftpPassword" ); password.setVendorFaValue( this.ftpPassword ); attrs.add( password ); } } } for ( UINotificationEmail e : this.getEmails() ) { logger.debug("Adding email " + e ); VendorAttributes email = new VendorAttributes(); email.setStatus( "A" ); email.setVendorFakey( "email" ); email.setVendorFaValue( e.getEmailAddress() ); email.setFlags( e.getFlags() ); email.setVendorId( id ); attrs.add( email ); } } @JsonIgnore public Vendor getVendor() { saveVendorAttributes(); return this.vendor; } public int getVendorId() { return this.vendor.getVendorId(); } public void setVendorId( int vendorId ) { this.vendor.setVendorId( vendorId ); } public String getVendorType() { return this.vendor.getVendorType(); } public void setVendorType( String vendorType ) { this.vendor.setVendorType( vendorType ); } public String getVendorName() { return this.vendor.getVendorName(); } public void setVendorName( String vendorName ) { this.vendor.setVendorName( vendorName ); } public String getStatus() { return this.vendor.getStatus(); } public void setStatus( String status ) { this.vendor.setStatus( status ); } public boolean isFtpFlag() { return this.ftpFlag; } public void setFtpFlag( boolean ftpFlag ) { this.ftpFlag = ftpFlag; } public String getFtpHost() { return this.ftpHost; } public void setFtpHost( String ftpHost ) { this.ftpHost = ftpHost; } public String getFtpPath() { return this.ftpPath; } public void setFtpPath( String ftpPath ) { this.ftpPath = ftpPath; } public String getFtpUser() { return this.ftpUser; } public void setFtpUser( String ftpUser ) { this.ftpUser = ftpUser; } public String getFtpPassword() { return this.ftpPassword; } public void setFtpPassword( String ftpPassword ) { this.ftpPassword = ftpPassword; } public List<UINotificationEmail> getEmails() { if ( this.emails == null ) { this.emails = new ArrayList<UINotificationEmail>(); } return emails; } public void setEmails(List<UINotificationEmail> emails) { this.emails = emails; } }
更新2 这是杰克逊的输出：
{ "vendorName":"MAIL", "vendorId":45, "emails": [ { "emailAddress":"dfg", "success":false, "failure":false, "flags":0 } ], "vendorType":"DFG", "ftpFlag":true, "ftpHost":"kdsfjng", "ftpPath":"dsfg", "ftpUser":"sdfg", "ftpPassword":"sdfg", "status":"A" }
这是我在POST上返回的对象的结构：
{ "vendorId":"45", "vendorName":"MAIL", "vendorType":"DFG", "ftpFlag":true, "ftpHost":"kdsfjng", "ftpUser":"sdfg", "ftpPath":"dsfg", "ftpPassword":"sdfg", "status":"A", "emails": [ { "success":"false", "failure":"false", "emailAddress":"dfg" }, { "success":"true", "failure":"true", "emailAddress":"pfc@sj.org" } ] }
我也尝试过使用来自www.json.org的JSON库进行序列化，其结果与您在上面看到的完全一样。但是，当我发布该数据时，传递给控制器的UIVendor对象中的所有字段均为空（尽管该对象不是）。
更新： 从Spring 3.1开始，可以在@RequestBody控制器方法参数中使用@Valid。
@RequestMapping(value="/ajax/saveVendor.do", method = RequestMethod.POST) public @ResponseBody AjaxResponse saveVendor( @Valid @RequestBody UIVendor vendor, BindingResult result, Locale currentLocale )
经过多次尝试和错误，我终于尽我所能找出问题所在。使用以下控制器方法签名时：
客户端脚本必须以后数据（通常为“ application / x-www-form-urlencoded”）格式（即field = value＆field2 = value2）传递对象中的字段。这是在jQuery中完成的，如下所示：
$.post( "mycontroller.do", $.param(object), callback, "json" )
对于没有子对象或集合的简单POJO对象，这很好用，但是一旦您对要传递的对象引入了极大的复杂性，Spring的映射逻辑将无法识别jQuery用于序列化对象数据的符号：
object[0][field]
我解决此问题的方法是将控制器中的方法签名更改为：
@RequestMapping(value="/ajax/saveVendor.do", method = RequestMethod.POST) public @ResponseBody AjaxResponse saveVendor( @RequestBody UIVendor vendor, Locale currentLocale )
并将呼叫从客户端更改为：
$.ajax( { url:"ajax/mycontroller.do", type: "POST", data: JSON.stringify( objecdt ), success: callback, dataType: "json", contentType: "application/json" } );
这需要使用JSON javascript库。它还将contentType强制为“ application / json”，这是Spring在使用@RequestBody批注时所期望的，并将对象序列化为Jackson可以反序列化为有效对象结构的格式。
唯一的副作用是，现在我必须在controller方法内部处理自己的对象验证，但这相对简单：
BindingResult result = new BeanPropertyBindingResult( object, "MyObject" ); Validator validator = new MyObjectValidator(); validator.validate( object, result );
如果有人对这个过程有任何改进的建议，我非常高兴。
