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这实际上不是一个问题，而是通过几个帖子在该站点上报告的问题的解决方案。自从我解决了这个问题并找到了解决方案，我认为其他人可以节省时间。下面的代码从 Eclipse 运行时工作正常，但失败并出现错误“com.sun.jersey.api.client.ClientHandlerException: A message body writer for Java type....”

MultivaluedMap<String, String> formData = new MultivaluedMapImpl();
    formData.add("username", "demo");
    formData.add("password", "1234qwer");
    WebResource webResource = client.getResource("https://dev.example.com:8443/authenticate/login");
    ClientResponse response = webResource.type(MediaType.APPLICATION_FORM_URLENCODED).post(ClientResponse.class,formData);

我从帖子和回复中提供的链接中找到了答案。

基本上，这个想法是让 Jersey 通过服务查找器模式知道可用的消息读取器/写入器。示例如下所示

公共类 AndroidServiceIteratorProvider 扩展 ServiceIteratorProvider {

private static final String TAG = AndroidServiceIteratorProvider.class.getSimpleName();
private static final String MESSAGE = "Unable to load provider";

private static final HashMap<String, String[]> SERVICES = new HashMap<String, String[]>();

private static final String[] com_sun_jersey_spi_HeaderDelegateProvider = {
        "com.sun.jersey.core.impl.provider.header.MediaTypeProvider",
        "com.sun.jersey.core.impl.provider.header.StringProvider"
};

private static final String[] com_sun_jersey_spi_inject_InjectableProvider = { 
};

private static final String[] javax_ws_rs_ext_MessageBodyReader = {
        "com.sun.jersey.core.impl.provider.entity.StringProvider",
        "com.sun.jersey.core.impl.provider.entity.FormMultivaluedMapProvider",
        "com.sun.jersey.core.impl.provider.entity.ReaderProvider"
};

private static final String[] javax_ws_rs_ext_MessageBodyWriter = {
        "com.sun.jersey.core.impl.provider.entity.StringProvider",
        "com.sun.jersey.core.impl.provider.entity.FormMultivaluedMapProvider",
        "com.sun.jersey.core.impl.provider.entity.ReaderProvider"
};

static {
    SERVICES.put("com.sun.jersey.spi.HeaderDelegateProvider",
            com_sun_jersey_spi_HeaderDelegateProvider);
    SERVICES.put("com.sun.jersey.spi.inject.InjectableProvider",
            com_sun_jersey_spi_inject_InjectableProvider);
    SERVICES.put("javax.ws.rs.ext.MessageBodyReader",
            javax_ws_rs_ext_MessageBodyReader);
    SERVICES.put("javax.ws.rs.ext.MessageBodyWriter",
            javax_ws_rs_ext_MessageBodyWriter);
    SERVICES.put("jersey-client-components", new String[]{});
    SERVICES.put("com.sun.jersey.client.proxy.ViewProxyProvider", new String[]{});
}

@SuppressWarnings("unchecked")
@Override
public Iterator<Class<T>> createClassIterator(Class<T> service,
        String serviceName, ClassLoader loader,
        boolean ignoreOnClassNotFound) {

    String[] classesNames = SERVICES.get(serviceName);
    int length = classesNames.length;
    ArrayList<Class<T>> classes = new ArrayList<Class<T>>(length);
    for (int i = 0; i < length; i++) {
        try {
            classes.add((Class<T>) Class.forName(classesNames[i]));
        } catch (ClassNotFoundException e) {
            Log.v(TAG, MESSAGE,e);
        }
    }
    return classes.iterator();
}

@Override
public Iterator<T> createIterator(Class<T> service, String serviceName,
        ClassLoader loader, boolean ignoreOnClassNotFound) {

    String[] classesNames = SERVICES.get(serviceName);
    int length = classesNames.length;
    ArrayList<T> classes = new ArrayList<T>(length);
        for (int i = 0; i <length; i++) {
        try {
            classes.add(service.cast(Class.forName(classesNames[i])
                    .newInstance()));
        } catch (IllegalAccessException e) {
            Log.v(TAG, MESSAGE,e);
        } catch (InstantiationException e) {
            Log.v(TAG, MESSAGE,e);
        } catch (ClassNotFoundException e) {
            Log.v(TAG, MESSAGE,e);
        }
    }

    return classes.iterator();
}

}

注意 javax_ws_rs_ext_MessageBodyReader 和 javax_ws_rs_ext_MessageBodyWriter 中声明的字符串参数。您需要将相应的读取器/写入器添加到字符串数组，然后通过 API 调用将此提供程序与 Jersey 挂钩，如下所示

 ServiceFinder.setIteratorProvider(new AndroidServiceIteratorProvider());

可以在此处找到消息阅读器和作者的列表

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