从Java Web服务获取字符串时出现问题

Question

我编写了示例Web服务客户端和服务器，其中服务器将读取文件并将内容存储在字符串中。最后，服务器将该字符串发送给客户端。当我尝试在客户端打印该字符串时，我没有得到输出。遵循服务器代码

@WebMethod(operationName = "createInstance")
public String createInstance() throws IOException {
    //TODO write your implementation code here:
    String file = "Test.txt";
    BufferedReader reader = new BufferedReader(new FileReader(file));
    String line = null;
    StringBuilder stringBuilder = new StringBuilder();
    String ls = System.getProperty("line.separator");
    while ((line = reader.readLine()) != null) {
        stringBuilder.append(line);
        stringBuilder.append(ls);
    }
    return stringBuilder.toString();
}

客户端代码

 <%
    try {
    com.student.UnivServiceService service = new com.student.UnivServiceService();
    com.student.UnivService port = service.getUnivServicePort();
    // TODO process result here
    java.lang.String result = port.createInstance();
    out.println("Result = "+result.toString());
    } catch (Exception ex) {
    // TODO handle custom exceptions here
    }
    %>

任何人都可以告诉我上述程序的错误。