从Java中的一个WebService返回一个ArrayList [英] Returning an ArrayList from a WebService in Java

问题描述

我有从我的Web服务（Java）的。返回一个ArrayList问题

I am having a problem returning an ArrayList from my web service (Java).

我写了一个测试Web服务和客户端消耗它。所有看似细微的工作 - 这是客户端在调用服务器和服务器接收操作请求

I have written a test web service and client which consumes it. All appears to work fine - that is the client is calling the server and the server receives the operation request.

不过，我已经写了，我希望它返回一个ArrayList的简单方法。

However, I have written a simple method that I want it to return an ArrayList.

我有我的接口定义如下：

I have my interface definition as follows:

@WebService
@SOAPBinding(style = Style.RPC)
public interface ISQLServerConnectionWS {

    @WebMethod
    ArrayList getSimpleArrayList();
}

我有我的服务器端执行返回的ArrayList

I have my server side implementation to return the ArrayList:

@WebService(endpointInterface="WebServices.ISQLServerConnectionWS")
public class SQLConnectionWSServer
    implements ISQLServerConnectionWS {

    @Override
    public ArrayList getSimpleArrayList() {
        ArrayList al = new ArrayList();
        al.add( "This" );
        al.add( "is" );
        al.add( "a" );
        al.add( "test" );
        return al;
    }
}

最后我的客户调用它：

And finally my client call to it:

ArrayList results = server.getSimpleArrayList();

服务器填充数组列表罚款。但是，回到了客户端，ArrayList是空的。它的大小为0。

The server populates the array list fine. However, back at the client side, the ArrayList is empty. It has a size of 0.

如果我在审视我的网址（http://127.0.0.1:9876/myservice-sql?wsdl）为executeSelectSQL的WSDL，它看起来像：

If I examine the WSDL at my URL (http://127.0.0.1:9876/myservice-sql?wsdl) for the executeSelectSQL, it looks like:

<message name="executeSelectSQLResponse">
    <part name="return" type="tns:arrayList"/>
</message>

我失去了一些东西明显？

Am I missing something obvious?

修改

不过，如果我有一个Web方法的接口定义为：

However, if I have a web method defines in the interface as:

@WebMethod
String getAString();

和服务器实现：

@Override
public String getAString() {
    return "hello there";
}

那么这工作正常 - 你好收到客户端

then this works fine - "hello there" is received on the client.

结束编辑

干杯，

Andez

推荐答案

作为JAXB不能处理的集合作为顶级对象，只能作为Bean的属性使用数组，而不是一个ArrayList的。另外，创建一个bean，并把该ArrayList在里面。

Use an array instead of an ArrayList as JAXB cannot handle collections as top-level objects, only as properties of beans. Alternatively, create a bean and put the ArrayList in it.

请参阅错误： JAXB-223：JAXB不支持集合类作为顶级对象

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