Web Service

1、定义： 跨平台，跨语言的远程调用技术。web service接口实际上就是RPC（远程过程调用）的一种实现。

  RPC不仅可以走HTTP/HTTPS, 也可以自定义 tcp 协议, 从而省略HTTP繁杂的规则和冗余信息。

2、如何使用？

（1）编写webservice接口

查看代码

#定义接口
@WebService
public interface UserWebService {
}

#定义接口实现并main手动发布
@WebService
public class MyUserWebServiceImpl implements MyUserWebService {

    @Autowired
    private Student student;

    //static方法不会被发布
    public static String sayHello1(String name){
        return "hello1,"+name;
    }

    //final方法不会被发布
    public final String sayHello2(String name){
        return "hello2,"+name;
    }

    //@WebMethod(exclude=true)排除后，方法不会被发布
    @WebMethod(exclude=true)
    public String sayHello3(String name){
        return "hello3,"+name;
    }

    public String sayHello4(String name){
        return "hello4,"+name;
    }

    @Override
    @WebMethod
    public UserResult sayHello(String name) {
        UserResult userResult = new UserResult();
        userResult.setMessage("hello,"+name);
        return userResult;
    }

    @Override
    @WebMethod
    public UserResult getUsers() {
        UserResult userResult = new UserResult();
        UserDTO userDTO = new UserDTO();
        userDTO.setName(student.getName());
        userDTO.setAge(student.getAge());
        userResult.setUserDto(userDTO);
        return userResult;
    }

    public static void main(String[] args) {
        MyUserWebService webService = new MyUserWebServiceImpl();
        String address = "http://localhost:8080/MyUserWebServiceImpl";
        Endpoint.publish(address, webService);
        System.out.println("发布成功，请访问：http://localhost:8080/MyUserWebServiceImpl?wsdl");
    }
}

#定义vo类 
public class UserDTO {
}

#定义返回对象
public class UserResult {
	/**
	 * 成功
	 */
	public static final String SUCCESS = "0000";
	
	/**
	 * 失败
	 */
	public static final String FAILED = "0001"; 
	/**
	 * 缺少参数
	 */
	public static final String MISSPARAMETER = "0002";
	/**
	 * 参数异常
	 */
	public static final String PARAMETERERROR = "0003";
	/**
	 * /无权限
	 */
	public static final String AUTHORITYERROR="0004";
	/**
	 * 请求数据为空
	 */
    public static final String NULLERROR="0005";
    
	/**
	 * 重复
	 */
    public static final String REPEAT="0006";

    /**
            * 用户DTO
     */
    private UserDTO userDto;
    
	private String ResultCode = SUCCESS;
	private String Message = "";
	
	public UserResult buildResult(String resultCode, String resultMessage) {
		setResult(resultCode, resultMessage);
		return this;
	}

	/**
	 * 设置返回结果.
	 */
	public void setResult(String resultCode, String resultMessage) {
		ResultCode = resultCode;
		Message = resultMessage;
	}
	
	public UserDTO getUserDto() {
		return userDto;
	}

	public void setUserDto(UserDTO userDto) {
		this.userDto = userDto;
	}

	public String getResultCode() {
		return ResultCode;
	}

	public void setResultCode(String resultCode) {
		ResultCode = resultCode;
	}

	public String getMessage() {
		return Message;
	}

	public void setMessage(String message) {
		Message = message;
	}

	public String toString(){
		JSONObject objectInput = new JSONObject();
		objectInput.put("UserResult", this);
		return objectInput.toString();
	}
}

   （2）服务端Server发布接口

注意：

• 类上添加注解@WebService，类中所有非静态方法都会被发布
• 静态方法和final方法不能被发布
• 方法上加@WebMentod(exclude=true)后，此方法不被发布

借助jdk的wsimort.exe工具生成客户端代码：wsimport -keep http://localhost:8989/webservice/hello?wsdl，wsimport -keep url，其中url为wsdl文件的路径。

wsimport -s . http://localhost:8082/MyUserWebServiceImpl?wsdl

 （3）Client客户端吧代码复制到本地，再调用接口

#删除接口的注解
@XmlSeeAlso({
    ObjectFactory.class
})

dto
result
service
serviceImpl复制到本地代码
#该import的import

public static void main(String[] args) {
    // 创建服务视图，视图是从wsdl文件的service标签的name属性获取
    MyUserWebServiceImplService factory = new MyUserWebServiceImplService();
    // 获取到jdk动态对立对象
    // 获取服务实现类，实现类从wsdl文件的portType的name属性获取
    MyUserWebServiceImpl helloWebServiceSEIImplPort = factory.getMyUserWebServiceImplPort();
    // class com.sun.proxy.$Proxy32
    System.out.println(helloWebServiceSEIImplPort.getClass());
    // 获取查询方法，从portType的operation标签获取
    String sayHello4 = helloWebServiceSEIImplPort.sayHello4("hell04");
    System.out.println(sayHello4);
    UserResult result4 = helloWebServiceSEIImplPort.sayHello("hell04");
    System.out.println(result4.getMessage());
    UserResult result = helloWebServiceSEIImplPort.getUsers();
    System.out.println(result.getUserDto().toString());
}