RESTEasy之返回JSON数据格式

环境：

JDK1.6

resteasy-jaxrs-2.3.4.Final

下载地址：http://liquidtelecom.dl.sourceforge.net/project/resteasy/Resteasy%20JAX-RS/2.3.4.Final/resteasy-jaxrs-2.3.4.Final-all.zip

说明：本例参考官网里的examples。如果需要更多信息，请参考官网的例子。

1，建立web项目，这里建站名为resteasy-json的web项目。

2，添加如下web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
  xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">

  <display-name>Archetype Created Web Application</display-name>
  
  <context-param>
      <param-name>javax.ws.rs.Application</param-name>
      <param-value>org.jboss.resteasy.examples.service.LibraryApplication</param-value>
   </context-param>

   <context-param>
      <param-name>resteasy.servlet.mapping.prefix</param-name>
      <param-value>/resteasy</param-value>
   </context-param>

   <listener>
      <listener-class>
         org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap
      </listener-class>
   </listener>

   <servlet>
      <servlet-name>Resteasy</servlet-name>
      <servlet-class>
         org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher
      </servlet-class>
   </servlet>

   <servlet-mapping>
      <servlet-name>Resteasy</servlet-name>
      <url-pattern>/resteasy/*</url-pattern>
   </servlet-mapping>
   
   <welcome-file-list>
        <welcome-file>/index.jsp</welcome-file>
   </welcome-file-list>
</web-app>

3，添加Library.java

package org.jboss.resteasy.examples.service;

import java.io.StringWriter;
import java.util.ArrayList;
import java.util.HashMap;

import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.xml.bind.Marshaller;

import org.jboss.resteasy.annotations.providers.jaxb.json.BadgerFish;
import org.jboss.resteasy.examples.data.Book;
import org.jboss.resteasy.examples.data.BookListing;
import org.jboss.resteasy.plugins.providers.jaxb.json.BadgerContext;
import org.jboss.resteasy.plugins.providers.jaxb.json.JettisonMappedContext;

/**
 * @author <a href="mailto:[email protected]">Bill Burke</a>
 * @version $Revision: 1 $
 */
@Path("library")
public class Library {
    private HashMap<String,Book> books = new HashMap<String,Book>();

    public Library() {
        books.put("596529260", new Book("Leonard Richardson", "596529260", "RESTful Web Services"));
        books.put("333333333", new Book("Bill Burke", "596529260", "EJB 3.0"));
    }

    @GET
    @Path("books/badger")
    @Produces("application/json")
    @BadgerFish
    public BookListing getBooksBadger() {
        return getListing();
    }

    @GET
    @Path("books/mapped")
    @Produces("application/json")
    // @Mapped // mapped is the default format
    public BookListing getBooksMapped() {
        return getListing();
    }

    @GET
    @Path("books/badger.html")
    @Produces("text/html")
    public String getBooksBadgerText() throws Exception {
        BookListing listing = getListing();
        BadgerContext context = new BadgerContext(BookListing.class);
        StringWriter writer = new StringWriter();
        Marshaller marshaller = context.createMarshaller();
        marshaller.marshal(listing, writer);
        return writer.toString();
    }

    @GET
    @Path("books/mapped.html")
    @Produces("text/html")
    public String getBooksMappedText() throws Exception {
        BookListing listing = getListing();
        JettisonMappedContext context = new JettisonMappedContext(BookListing.class);
        StringWriter writer = new StringWriter();
        Marshaller marshaller = context.createMarshaller();
        marshaller.marshal(listing, writer);
        return writer.toString();
    }

    private BookListing getListing() {
        ArrayList<Book> list = new ArrayList<Book>();
        list.addAll(books.values());
        return new BookListing(list);
    }

}

4，添加LibraryApplication.java

package org.jboss.resteasy.examples.service;

import java.util.HashSet;
import java.util.Set;

import javax.ws.rs.core.Application;

/**
 * @author <a href="mailto:[email protected]">Bill Burke</a>
 * @version $Revision: 1 $
 */
public class LibraryApplication extends Application {
    HashSet<Object> singletons = new HashSet<Object>();

    public LibraryApplication() {
        singletons.add(new Library());
    }

    @Override
    public Set<Class<?>> getClasses() {
        HashSet<Class<?>> set = new HashSet<Class<?>>();
        return set;
    }

    @Override
    public Set<Object> getSingletons() {
        return singletons;
    }
}

5，添加Book.java

package org.jboss.resteasy.examples.data;

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

/**
 * @author <a href="mailto:[email protected]">Bill Burke</a>
 * @version $Revision: 1 $
 */
@XmlRootElement(name = "book")
public class Book {
    private String author;
    private String ISBN;
    private String title;

    public Book() {
    }

    public Book(String author, String ISBN, String title) {
        this.author = author;
        this.ISBN = ISBN;
        this.title = title;
    }

    @XmlElement
    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    @XmlElement
    public String getISBN() {
        return ISBN;
    }

    public void setISBN(String ISBN) {
        this.ISBN = ISBN;
    }

    @XmlAttribute
    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }
}

6，添加BookListing.java

package org.jboss.resteasy.examples.data;

import java.util.List;

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

/**
 * @author <a href="mailto:[email protected]">Bill Burke</a>
 * @version $Revision: 1 $
 */
@XmlRootElement(name = "listing")
public class BookListing {
    private List<Book> books;

    public BookListing() {
    }

    public BookListing(List<Book> books) {
        this.books = books;
    }

    @XmlElement(name = "books")
    public List<Book> getBooks() {
        return books;
    }
}

7,添加index.jsp

<html>
<body>
<h2>Hello World!</h2>
<a href="resteasy/library/books/mapped" target="_blank">resteasy/library/books/mapped</a><br/>
<a href="resteasy/library/books/badger" target="_blank">resteasy/library/books/badger</a>
</body>
</html>

8，加入必要的lib：

jaxrs-api-2.3.4.Final.jar
jettison-1.3.1.jar
resteasy-jaxb-provider-2.3.4.Final.jar
resteasy-jaxrs-2.3.4.Final.jar
resteasy-jettison-provider-2.3.4.Final.jar
scannotation-1.0.3.jar

9，部署项目到tomcat里，启动服务器

9，访问http://localhost:8080/resteasy-json/

10，点击页面resteasy/library/books/mapped

11，如果出现下面的内容，则部署成功。

{"listing":{"books":[{"@title":"EJB 3.0","author":"Bill Burke","ISBN":596529260},{"@title":"RESTful Web Services","author":"Leonard Richardson","ISBN":596529260}]}}

RESTEasy之返回JSON数据格式

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