JAX-RS之与XML打交道

今天学习的是JAX-RS之中结合使用XML，使用的依然是JAXB，这里展示如何建立一个
user对象，将其转化为XML，并且返回给客户端。
  
1） 需要包含resteasy-jaxb-provider.jar这个包

2）创建USER对象，使用JAXB的注解，如下
  

import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "user")
public class User {

    String username;
    String password;
    int pin;

    @XmlElement
    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    @XmlElement
    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    @XmlAttribute
    public int getPin() {
        return pin;
    }

    public void setPin(int pin) {
        this.pin = pin;
    }

}

import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
 
@XmlRootElement(name = "user")
public class User {
 
	String username;
	String password;
	int pin;
 
	@XmlElement
	public String getUsername() {
		return username;
	}
 
	public void setUsername(String username) {
		this.username = username;
	}
 
	@XmlElement
	public String getPassword() {
		return password;
	}
 
	public void setPassword(String password) {
		this.password = password;
	}
 
	@XmlAttribute
	public int getPin() {
		return pin;
	}
 
	public void setPin(int pin) {
		this.pin = pin;
	}
 
}

   使用JAXB后，会转为如下XML：
<user pin="value">
<password>value</password>
<username>value</username>
  </user>
3
  JAX-RS要返回XML的话，可以通过@Produces("application/xml")标签,前提是user对象是经过jaxb的

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;

@Path("/xml/user")
public class XMLService {

    @GET
    @Path("/get")
    @Produces("application/xml")
    public User getUserInXML() {

        User user = new User();
        user.setUsername("mkyong");
        user.setPassword("password");
        user.setPin(123456);

        return user;

    }

}

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
 
@Path("/xml/user")
public class XMLService {
 
	@GET
	@Path("/get")
	@Produces("application/xml")
	public User getUserInXML() {
 
		User user = new User();
		user.setUsername("mkyong");
		user.setPassword("password");
		user.setPin(123456);
 
		return user; 
 
	}
 
}

    当运行“/xml/user/get”时，就返回XML了：
<user pin="123456">
<password>password</password>
<username>mkyong</username>
</user>