【JAX-WS入门系列】第04章_SOAP异常处理和Handler处理

转载

mb5fe94b83e4685 2013-05-31 22:07:00

文章标签 java xml 服务端客户端 ide 文章分类 Java 后端开发

客户端和服务端都是Java Project，首先列出服务端代码

首先是SEI，即服务端接口类HelloService.java

package com.jadyer.service;

import javax.jws.WebParam;
import javax.jws.WebResult;
import javax.jws.WebService;

import com.jadyer.exception.UserException;

@WebService(targetNamespace="http://blog.csdn.net/jadyer")
public interface HelloService {
  @WebResult(name="sayHelloResult")
  public String sayHello(@WebParam(name="name")String name);

  @WebResult(name="loginResult")
  public String login(@WebParam(name="username")String username,
            @WebParam(name="password")String password) throws UserException;
}

然后是SIB，即服务端接口实现类HelloServiceImpl.java

package com.jadyer.service;

import javax.jws.HandlerChain;
import javax.jws.WebService;

import com.jadyer.exception.UserException;

@WebService(endpointInterface="com.jadyer.service.HelloService", targetNamespace="http://blog.csdn.net/jadyer")
@HandlerChain(file="myHandlerChain.xml")
public class HelloServiceImpl implements HelloService {
  @Override
  public String sayHello(String name) {
    System.out.println("Receive the name=[" + name + "]......");
    if(null==name){
      return "Hello,World";
    }else{
      return "Hello," + name;
    }
  }

  @Override
  public String login(String username, String password) throws UserException {
    System.out.println("Receive the username=[" + username + "],password=[" + password + "]......");
    if("admin".equals(username) && "hongyu".equals(password)){
      return "用户[" + username + "]认证通过";
    }
    throw new UserException("用户[" + username + "]认证未通过");
  }
}

下面是自定义的服务端异常类UserException.java

package com.jadyer.exception;

//这里不要用RuntimeException
//因为RuntimeException会导致服务端在抛异常给客户端时,服务端自身也会抛相同的异常
//所以WebServices开发中定义异常时要注意这一点
public class UserException extends Exception {
  private static final long serialVersionUID = 6252203957834273236L;

  public UserException() {
    super();
  }

  public UserException(String message) {
    super(message);
  }
}

下面是自定义的服务端Handler类LicenseHandler.java

package com.jadyer.handler;

import java.util.Iterator;
import java.util.Set;

import javax.xml.namespace.QName;
import javax.xml.soap.SOAPBody;
import javax.xml.soap.SOAPEnvelope;
import javax.xml.soap.SOAPException;
import javax.xml.soap.SOAPFault;
import javax.xml.soap.SOAPHeader;
import javax.xml.soap.SOAPHeaderElement;
import javax.xml.soap.SOAPMessage;
import javax.xml.ws.handler.MessageContext;
import javax.xml.ws.handler.soap.SOAPHandler;
import javax.xml.ws.handler.soap.SOAPMessageContext;
import javax.xml.ws.soap.SOAPFaultException;

/**
 * Handler编写步骤
 * 1)创建一个实现了SOAPHandler<SOAPMessageContext>的类
 * 2)在handleMessage()方法中编写代码
 * 3)配置Handler,自定义一个名字随意的xml
 * 4)在服务上启动过滤链
 *   在服务端或者客户端的Service实现类上使用@HandlerChain(file="myHandlerChain.xml")即可
 * @create May 17, 2013 12:07:54 AM
 * @author 玄玉<http://blog.csdn.net/jadyer>
 */
public class LicenseHandler implements SOAPHandler<SOAPMessageContext> {
  @Override
  public Set<QName> getHeaders() {
    return null;
  }

  @Override
  public void close(MessageContext context) {

  }

  @Override
  public boolean handleFault(SOAPMessageContext context) {
    System.out.println("Server.handleFault() is invoked......");
    return false;
  }

  @Override
  @SuppressWarnings("unchecked")
  public boolean handleMessage(SOAPMessageContext context) {
    System.out.println("Server.handleMessage() is invoked......");
    //从服务端角度看:inbound表示接收客户端消息,outbound表示响应消息给客户端..从客户端角度看时正好与之相反
    Boolean isOutBound = (Boolean)context.get(MessageContext.MESSAGE_OUTBOUND_PROPERTY);
    if(isOutBound){
      return true;
    }

    SOAPMessage message = context.getMessage();
    SOAPHeader header = null;
    SOAPBody body = null;
    try {
      SOAPEnvelope envelope = message.getSOAPPart().getEnvelope();
      header = envelope.getHeader();
      body = envelope.getBody();
    } catch (SOAPException e) {
      e.printStackTrace();
    }
    //获取Body中的part name
    String partName = body.getChildNodes().item(0).getLocalName();
    //只对服务端开放的login()方法进行验证,否则它会对服务端开放的所有方法进行验证
    if(!"login".equals(partName)){
      return true;
    }

    if(null==header){
      System.out.println("未找到头信息......");
      this.throwHeaderInvalid(body, "未找到头信息......");
    }
    Iterator<SOAPHeaderElement> iterator = header.extractAllHeaderElements();
    if(!iterator.hasNext()){
      System.out.println("头信息不能为空......");
      this.throwHeaderInvalid(body, "头信息不能为空");
    }

    System.out.println("协议有效......");
    while(iterator.hasNext()){
      System.out.println(iterator.next().getTextContent());
    }
    return true;
  }


  private void throwHeaderInvalid(SOAPBody body, String causeInfo){
    try {
      //添加一个错误信息
      SOAPFault fault = body.addFault();
      fault.setFaultString("协议无效:" + causeInfo);
      throw new SOAPFaultException(fault);
    } catch (SOAPException e) {
      e.printStackTrace();
    }
  }
}

接下来是用于配置Handler的myHandlerChain.xml

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<javaee:handler-chains xmlns:javaee="http://java.sun.com/xml/ns/javaee" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <javaee:handler-chain>
    <javaee:handler>
      <javaee:handler-class>com.jadyer.handler.LicenseHandler</javaee:handler-class>
    </javaee:handler>
  </javaee:handler-chain>
</javaee:handler-chains>

最后是发布WebService服务的ServerApp.java

package com.jadyer.server;

import javax.xml.ws.Endpoint;

import com.jadyer.service.HelloServiceImpl;

/**
 * SOAP异常处理和Handler处理
 * @see ----------------------------------------------------------------------------------------------
 * @see 手工指定命名空间时,建议在SEI和SIB都使用@WebService注解,如下所示
 * @see @WebService(targetNamespace="http://blog.csdn.net/jadyer")
 * @see ----------------------------------------------------------------------------------------------
 * @see 通过Handler处理SOAP消息(Handler类似于过滤器,它分为SOAPHandler和LogicalHandler)
 * @see SOAPHandler-----可以获取SOAPMessage信息
 * @see LogicalHandler--只能获取SOAPBody信息
 * @see 客户端发出的消息始终都是LogicalHandler先处理,然后才是SOAPHandler处理,服务器端的消息处理顺序则与之相反
 * @see ----------------------------------------------------------------------------------------------
 * @create May 16, 2013 6:14:10 PM
 * @author 玄玉<http://blog.csdn.net/jadyer>
 */
public class ServerApp {
  public static void main(String[] args) {
    Endpoint.publish("http://127.0.0.1:8888/myHelloService", new HelloServiceImpl());
  }
}

至此，服务端代码发布完毕，下面是客户端代码

首先是客户端自定义的Handler类HeaderHandler.java

package com.jadyer.handler;

import java.io.IOException;
import java.util.Set;

import javax.xml.namespace.QName;
import javax.xml.soap.SOAPEnvelope;
import javax.xml.soap.SOAPException;
import javax.xml.soap.SOAPHeader;
import javax.xml.soap.SOAPMessage;
import javax.xml.ws.handler.MessageContext;
import javax.xml.ws.handler.soap.SOAPHandler;
import javax.xml.ws.handler.soap.SOAPMessageContext;

public class HeaderHandler implements SOAPHandler<SOAPMessageContext> {
  @Override
  public Set<QName> getHeaders() {
    return null;
  }

  @Override
  public void close(MessageContext context) {

  }

  @Override
  public boolean handleFault(SOAPMessageContext context) {
    System.out.println("\nClient.handleFault() is invoked.....");
    return false;
  }

  @Override
  public boolean handleMessage(SOAPMessageContext context) {
    System.out.println("\nClient.handleMessage() is invoked.....");
    Boolean isOutBound = (Boolean)context.get(MessageContext.MESSAGE_OUTBOUND_PROPERTY);
    if(isOutBound){
      SOAPMessage message = context.getMessage();
      try {
        SOAPEnvelope envelope = message.getSOAPPart().getEnvelope();
        SOAPHeader header = envelope.getHeader();
        String partName = envelope.getBody().getChildNodes().item(0).getLocalName();
//        System.out.println("------------------------------------");
//        NodeList nan = envelope.getBody().getChildNodes();
//        System.out.println("nan.getLength()=" + nan.getLength());
//        for(int i=0; i<nan.getLength(); i++){
//          System.out.println(nan.item(i).getLocalName());
//        }
//        System.out.println("------------------------------------");
        //只在访问服务端login()方法时才加头信息
        if("login".equals(partName)){
          if(null == header){
            header = envelope.addHeader();
          }
          QName qname = new QName("http://blog.csdn.net/jadyer", "licenseInfo", "ns");
          header.addHeaderElement(qname).setValue("Jadyer");
          message.writeTo(System.out);
        }
      } catch (SOAPException e) {
        e.printStackTrace();
      } catch (IOException e) {
        e.printStackTrace();
      }
    }
    return true;
  }
}

下面是用于配置客户端Handler的myHandlerChain.xml

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<javaee:handler-chains xmlns:javaee="http://java.sun.com/xml/ns/javaee" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <javaee:handler-chain>
    <javaee:handler>
      <javaee:handler-class>com.jadyer.handler.HeaderHandler</javaee:handler-class>
    </javaee:handler>
  </javaee:handler-chain>
</javaee:handler-chains>

最后是客户端调用服务端代码

注：客户端代码由wsimport生成，

package com.jadyer.client;

import javax.xml.ws.soap.SOAPFaultException;

import net.csdn.blog.jadyer.HelloService;
import net.csdn.blog.jadyer.HelloServiceImplService;
import net.csdn.blog.jadyer.UserException_Exception;

public class ClientApp {
  public static void main(String[] args) {
    HelloService server = new HelloServiceImplService().getHelloServiceImplPort();
    try {
      System.out.println(server.sayHello("玄玉"));
      System.out.println(server.login("admin", "hongyu"));
    } catch (UserException_Exception e) {
      //捕获服务端login()方法可能抛出的用户认证未通过的异常
      System.out.println("UserException:" + e.getMessage());
    } catch (SOAPFaultException e) {
      //捕获服务端可能抛出的SOAPHeader为空的异常
      System.out.println("SOAPFaultException:" + e.getMessage());
    }
  }
}

最后把示例运行时，控制台的输出也贴出来

下面是服务端的控制台输出

Server.handleMessage() is invoked......
Receive the name=[玄玉]......
Server.handleMessage() is invoked......
Server.handleMessage() is invoked......
协议有效......
Jadyer
Receive the username=[admin],password=[hongyu]......
Server.handleMessage() is invoked......

下面是客户端的控制台输出

Client.handleMessage() is invoked.....

Client.handleMessage() is invoked.....
Hello,玄玉

Client.handleMessage() is invoked.....
<S:Envelope xmlns:S="http://schemas.xmlsoap.org/soap/envelope/"><S:Header><ns:licenseInfo xmlns:ns="http://blog.csdn.net/jadyer">Jadyer</ns:licenseInfo></S:Header><S:Body><ns2:login xmlns:ns2="http://blog.csdn.net/jadyer"><username>admin</username><password>hongyu</password></ns2:login></S:Body></S:Envelope>
Client.handleMessage() is invoked.....
用户[admin]认证通过