Question

嗨，关于以下帖子 -

smartgwt listgrid RestDataSource not populating

我在尝试使用smartGWT和Spring3构建应用时遇到了问题。使用jackson将返回对象转换为json。

从spring控制器返回到客户端的json响应的错误（帖子末尾的完整堆栈跟踪）：

16：52：27.094 [ERROR] [utilapp] 16：52：27.092：TMR1：WARN：RestDataSource：isc_ItemListGrid_1_0：RestDataSouce transformResponse（）：JSON响应文本似乎不是标准响应格式。 com.smartgwt.client.core.JsObject $ SGWT_WARN：16：52：27.092：TMR1：WARN：RestDataSource：isc_ItemListGrid_1_0：RestDataSouce transformResponse（）：JSON响应文本似乎不是标准响应格式。

只是想知道是否有其他人在此之前遇到过这样的错误，或者有什么暗示可能是这背后的原因非常有用。

Json响应有效负载直接从浏览器点击相应的GET方法url - {＆＃34;状态＆＃34;：0，＆＃34;数据＆＃34;：空，＆＃34;错误＆＃34;：{}，＆＃34; endRow＆＃34;：0，＆＃34; STARTROW＆＃34;：0，＆＃34; totalRows＆＃34; - 1}

尽管在控制器中设置了这些字段，但所有字段都有默认值。

已定义DSResponse POJO以使json响应与链接上描述的内容同步 - http://www.smartclient.com/smartgwt/javadoc/com/smartgwt/client/data/RestDataSource.html

Web.xml：调度程序servlet条目

<servlet>
<servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>         
</servlet>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>

spring-servlet.xml - （基于注释，因此没有控制器bean只映射到JacksonJsonView）

<context:component-scan base-package="com.khush.util.server.rest" />
<context:component-scan base-package="com.khush.util.server.spring" />
<context:annotation-config/>
<mvc:annotation-driven/>

<bean class="org.springframework.web.servlet.view.ContentNegotiatingViewResolver">
<property name="mediaTypes">
<map>
<entry key="html" value="text/html"/>
<entry key="json" value="application/json"/>
</map>
</property>
<property name="viewResolvers">
<list>
<bean class="org.springframework.web.servlet.view.UrlBasedViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>
</list>
</property>
<property name="defaultViews">
<list>
<bean class="org.springframework.web.servlet.view.json.MappingJacksonJsonView">
<property name="prefixJson" value="true"/>
</bean>
</list>
</property>
</bean>

服务器端的Spring控制器 -

@Controller
@RequestMapping("/service*")
public class RPCListService {

       @RequestMapping(value="/fetch", method=RequestMethod.POST)
       public @ResponseBody DSResponse fetch(@RequestBody String json){
              DSResponse dsResponse = new DSResponse();
              List<Account> accounts = new ArrayList<Account>();
              Account account;

              for(int i = 0 ; i < 500 ; i++){
                     account = new Account();
                     account.setAccountId(i * 100L);
                     account.setAccountName("i " + "accountName");
                     account.setAccountNumber("i " + "accountNumber");
                  accounts.add(account);
              }
              dsResponse.setDate(accounts.toArray());

              return response;
       }

       @RequestMapping(value="/get", method=RequestMethod.GET)
       @ResponseBody public Object get(@RequestBody String json){
              DSResponse dsResponse = new DSResponse();
              List<Account> accounts = new ArrayList<Account>();
              Account account;

              for(int i = 0 ; i < 500 ; i++){
                     account = new Account();
                     account.setAccountId(i * 100L);
                     account.setAccountName("i " + "accountName");
                     account.setAccountNumber("i " + "accountNumber");
                  accounts.add(account);
              }
              dsResponse.setDate(accounts.toArray());
              return dsResponse;
       }
}

客户端的RestDataSource def -

public class AccountDataSource extends SpringJSONDataSource {

       public AccountDataSource(List<DataSourceField> fields) {
              super(fields);
              setPrettyPrintJSON(true);
       }

       @Override
       protected OperationBinding getFetch() {
              OperationBinding fetch = new OperationBinding();
           fetch.setOperationType(DSOperationType.FETCH);
           fetch.setDataProtocol(DSProtocol.POSTMESSAGE);
           DSRequest fetchProps = new DSRequest();
           fetchProps.setHttpMethod(httpMethod);
           fetch.setRequestProperties(fetchProps);

           return fetch;
       }

       @Override
       protected OperationBinding getRemove() {
              // TODO Auto-generated method stub
              return null;
       }

       @Override
       protected OperationBinding getAdd() {
              // TODO Auto-generated method stub
              return null;
       }

       @Override
       protected OperationBinding getUpdate() {
              // TODO Auto-generated method stub
              return null;
       }

       @Override
       public String getUpdateDataURL() {
              // TODO Auto-generated method stub
              return null;
       }

       @Override
       public String getRemoveDataURL() {
              // TODO Auto-generated method stub
              return null;
       }

       @Override
       public String getAddDataURL() {
              // TODO Auto-generated method stub
              return null;
       }

       @Override
       public String getFetchDataURL() {
              return "/rest/service/fetch";
       }
}


public abstract class SpringJSONDataSource extends RestDataSource {

       protected final String httpMethod;

       public SpringJSONDataSource(List<DataSourceField> fields){
              this(fields, "POST");
       }

       public SpringJSONDataSource(List<DataSourceField> fields, String httpMethod) {
           this.httpMethod = httpMethod;
           setDataFormat(DSDataFormat.JSON);
           addDataSourceFields(fields);
           setOperationBindings(getFetch());
           addURLs();
       }

       private void addURLs() {
           if(getUpdateDataURL() != null)
               setUpdateDataURL(getUpdateDataURL());

           if(getRemoveDataURL() != null)
               setRemoveDataURL(getRemoveDataURL());

           if(getAddDataURL() != null)
               setAddDataURL(getAddDataURL());

           if(getFetchDataURL() != null)
               setFetchDataURL(getFetchDataURL());

       }

       private void addDataSourceFields(List<DataSourceField> fields) {
           for (DataSourceField dataSourceField : fields) {
               addField(dataSourceField);
           }
       }

       protected abstract OperationBinding getFetch();
       protected abstract OperationBinding getRemove();
       protected abstract OperationBinding getAdd();
       protected abstract OperationBinding getUpdate();

       public abstract String getUpdateDataURL();
       public abstract String getRemoveDataURL();
       public abstract String getAddDataURL();
       public abstract String getFetchDataURL();
}

帐户和DSResponse对象 -

public class Account implements Serializable {

       private static final long serialVersionUID = 1L;       

       private Long accountId;

       private String accountName;

       private String accountNumber;


       public Account(){
       }

       public Account(Long accountId){
              setAccountId(accountId);
       }

       public Long getAccountId() {
              return accountId;
       }

       public void setAccountId(Long accountId) {
              this.accountId = accountId;
       }

       public String getAccountName() {
              return accountName;
       }

       public void setAccountName(String accountName) {
              this.accountName = accountName;
       }

       public String getAccountNumber() {
              return accountNumber;
       }

       public void setAccountNumber(String accountNumber) {
              this.accountNumber = accountNumber;
       }

       @Override
       public String toString(){
              StringBuilder sb = new StringBuilder();
              sb.append("Account Id: ").append(getAccountId()).append(", ");
              sb.append("Account Name: ").append(getAccountName()).append(", ");
              sb.append("Account Number: ").append(getAccountNumber()).append(", ");

              return sb.toString();
       }

       @Override
       public int hashCode(){
              final int prime = 31;
              int result = 1;
              result = prime * result + ((accountName == null) ? 0 : accountName.hashCode());
              return result;
       }

       @Override
       public boolean equals(Object obj){
              if(this == obj)
                     return true;
              if(obj == null)
                     return false;
              if(!(obj instanceof Account))
                     return false;
              Account other = (Account)obj;
              if(accountId == null){
                     if(other.accountId != null)
                           return false;
              } else if(! accountId.equals(other.accountId))
                     return false;
              if(accountName == null){
                     if(other.getAccountName() != null)
                           return false;
              }else if(! accountName.equals(other.accountName))
                     return false;
              if(accountNumber == null){
                     if(other.accountNumber != null)
                           return false;
              }else if(! accountNumber.equals(other.accountNumber))
                     return false;
              return true;
       }
}

public class DSResponse implements Serializable{

       private static final long serialVersionUID = -4937262101507779477L;

       public static int STATUS_FAILURE = -1;
       public static int STATUS_LOGIN_INCORRECT = -5;
       public static int STATUS_LOGIN_REQUIRED = -7;
       public static int STATUS_LOGIN_SUCCESS = -8;
       public static int STATUS_MAX_LOGIN_ATTEMPTS_EXCEEDED = -6;
       public static int STATUS_SERVER_TIMEOUT = -100;
       public static int STATUS_SUCCESS = 0;
       public static int STATUS_TRANSPORT_ERROR = -90;
       public static int STATUS_VALIDATION_ERROR = -4;

       private int status;
       private Integer startRow;
       private Integer endRow;
       private Integer totalRows;
       private Object[] data;
       private Map errors;

       public int getStatus()
       {
              return status;
       }

       public void setStatus(int status)
       {
              this.status = status;
       }

       public Integer getStartRow()
       {
              return startRow;
       }

       public void setStartRow(Integer startRow)
       {
              this.startRow = startRow;
       }

       public Integer getEndRow()
       {
              return endRow;
       }

       public void setEndRow(Integer endRow)
       {
              this.endRow = endRow;
       }

       public Integer getTotalRows()
       {
              return totalRows;
       }

       public void setTotalRows(Integer totalRows)
       {
              this.totalRows = totalRows;
       }

       public Object[] getData()
       {
              return data;
       }

       public void setData(Object[] data)
       {
              this.data = data;
       }

       public Map getErrors()
       {
              return errors;
       }

       public void setErrors(Map errors)
       {
              this.errors = errors;
       }

       public DSResponse()
       {
              status = STATUS_SUCCESS;

              errors = new HashMap();
              startRow = 0;
        endRow = 0;
        totalRows = -2;
       }

       public DSResponse(int status)
       {
              this.status = status;

              errors = new HashMap();
        startRow = 0;
        endRow = 0;
        totalRows = -1;
       }

}

完成堆栈跟踪：

09：24：58.896 [错误] [utilapp] 09：24：58.894：TMR0：WARN：RestDataSource：isc_AccountDataSource_0：RestDataSouce transformResponse（）：JSON响应文本似乎不是标准响应格式。 com.smartgwt.client.core.JsObject $ SGWT_WARN：09：24：58.894：TMR0：WARN：RestDataSource：isc_AccountDataSource_0：RestDataSouce transformResponse（）：JSON响应文本似乎不是标准响应格式。 at sun.reflect.NativeConstructorAccessorImpl.newInstance0（Native Method） at sun.reflect.NativeConstructorAccessorImpl.newInstance（NativeConstructorAccessorImpl.java:39） at sun.reflect.DelegatingConstructorAccessorImpl.newInstance（DelegatingConstructorAccessorImpl.java:27） at java.lang.reflect.Constructor.newInstance（Constructor.java:513）在com.google.gwt.dev.shell.MethodAdaptor.invoke（MethodAdaptor.java:105）在com.google.gwt.dev.shell.MethodDispatch.invoke（MethodDispatch.java:71）在com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172）在com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn（BrowserChannelServer.java:338）在com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript（BrowserChannelServer.java:219）在com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke（ModuleSpaceOOPHM.java:136）在com.google.gwt.dev.shell.ModuleSpace.invokeNative（ModuleSpace.java:571）在com.google.gwt.dev.shell.ModuleSpace.invokeNativeVoid（ModuleSpace.java:299）在com.google.gwt.dev.shell.JavaScriptHost.invokeNativeVoid(JavaScriptHost.java:107） at com.smartgwt.client.data.DataSource.transformResponse（DataSource.java） at sun.reflect.NativeMethodAccessorImpl.invoke0（Native Method） at sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:39） at sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:25）在java.lang.reflect.Method.invoke（Method.java:597）在com.google.gwt.dev.shell.MethodAdaptor.invoke（MethodAdaptor.java:103）在com.google.gwt.dev.shell.MethodDispatch.invoke（MethodDispatch.java:71）在com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172）在com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn（BrowserChannelServer.java:338）在com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript（BrowserChannelServer.java:219）在com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke（ModuleSpaceOOPHM.java:136）在com.google.gwt.dev.shell.ModuleSpace.invokeNative（ModuleSpace.java:571）在com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject（ModuleSpace.java:279）在com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject（JavaScriptHost.java:91）在com.google.gwt.core.client.impl.Impl.apply(Impl.java）在com.google.gwt.core.client.impl.Impl.entry0(Impl.java:242） at sun.reflect.GeneratedMethodAccessor50.invoke（Unknown Source） at sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:25）在java.lang.reflect.Method.invoke（Method.java:597）在com.google.gwt.dev.shell.MethodAdaptor.invoke（MethodAdaptor.java:103）在com.google.gwt.dev.shell.MethodDispatch.invoke（MethodDispatch.java:71）在com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172）在com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:293）在com.google.gwt.dev.shell.BrowserChannelServer.processConnection（BrowserChannelServer.java:547）在com.google.gwt.dev.shell.BrowserChannelServer.run（BrowserChannelServer.java:364）在java.lang.Thread.run（Thread.java:619）

谢谢！

Answer 1

根据您的评论，您的回复中没有数据。您的回复是否与指定的格式here完全匹配？

我建议它可能不匹配，因为您的错误消息是

JSON响应文本似乎不是标准响应格式

下一步该怎么做？也许尝试将一些非常简单的对象转换为JSON以查看问题是否与您的Account对象有关？在响应中只使用一个Account对象尝试一下？或者发布您的帐户对象代码？

Answer 2

通过定义一个简单的java对象（用作Spring控制器的返回类型）来实现它的排序，它实现了Serializable接口和一个名为'response'的Map类型的变量，并将json响应的内容添加到该映射作为键值配对和它奏效了。

感谢

Spring + GWT + jackson + JSON响应文本似乎没有采用标准响应格式

2 个答案: