WebService返回XML/JSON文件 [英] WebService return a XML/JSON file

问题描述

我需要编写一个简单的Java Web服务，该服务可以XML/JSON文件的形式显示其输出.

I require to write a simple java webservice that could show its output in the form of a XML/JSON file.

例如，用户将单击链接或按钮，并且将执行一条简单的SQL语句SELECT * FROM PERSON，并且上述SQL查询的结果应以XML/JSON文件的形式显示.

For example the user will click a link or a button, and a simple SQL statement would get executed SELECT * FROM PERSON and the result of the above SQL query should be displayed in the form a XML/JSON file.

我已经用Google搜索了几次，但是找不到合适的教程或示例代码.有人可以通过提供示例代码或教程来为我提供帮助.

I have googled this several times but failed to find a suitable tutorial or a sample code. Can some one help me by providing a sample code or a tutorial that would help me.

推荐答案

您可以使用 JAX-RS 执行以下操作:

You could do something like the following with JAX-RS:

package org.example;

import java.util.List;

import javax.ejb.*;
import javax.persistence.*;
import javax.ws.rs.*;
import javax.ws.rs.core.MediaType;

@Stateless
@LocalBean
@Path("/customers")
public class CustomerService {

    @PersistenceContext(unitName="CustomerService",
                        type=PersistenceContextType.TRANSACTION)
    EntityManager entityManager;


    @GET
    @Produces({MediaType.APPLICATION_XML, MediaType.APPLICATION_JSON})
    @Path("{id}")
    public Customer read(@PathParam("id") long id) {
        return entityManager.find(Customer.class, id);
    }

}

完整示例

• 第1部分-数据库
• 第2部分-将数据库映射到JPA实体
• 第3部分-将JPA实体映射到XML (使用JAXB)
• 第4部分-RESTful服务
• 第5部分-客户

• Part 1 - The Database
• Part 2 - Mapping the Database to JPA Entities
• Part 3 - Mapping JPA entities to XML (using JAXB)
• Part 4 - The RESTful Service
• Part 5 - The Client

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