使用OSGi-JAXRS-Connector实现Restful

来源：互联网发布：家用灭蚊知乎编辑：程序博客网时间：2024/06/05 03:49

Step1: 添加Connector支持

finish->oK完成

Step2：新建Plugin-in Project

源码结构

Blog.Java

package api;

public class Blog {

private String title;

private String content;

private String category;

private int readCnt;

public Blog(){}

public Blog(String title, String content, String category, int readCnt) {

super();

this.title = title;

this.content = content;

this.category = category;

this.readCnt = readCnt;

}

public String getTitle() {

return title;

}

public void setTitle(String title) {

this.title = title;

}

public String getContent() {

return content;

}

public void setContent(String content) {

this.content = content;

}

public String getCategory() {

return category;

}

public void setCategory(String category) {

this.category = category;

}

public int getReadCnt() {

return readCnt;

}

public void setReadCnt(int readCnt) {

this.readCnt = readCnt;

}

IBlogService.java

package api;

import java.util.List;

import javax.ws.rs.GET;

import javax.ws.rs.Path;

import javax.ws.rs.Produces;

import javax.ws.rs.core.MediaType;

@Path("/blog")

public interface IBlogApi {

@GET

@Produces(MediaType.TEXT_HTML)

public String getHtml();

@GET

@Path("/blogs")

@Produces(MediaType.APPLICATION_JSON)

public List<Blog> getBlogs();

}

BlogApiImpl.java

package api.impl;

import java.util.ArrayList;

import java.util.List;

import javax.ws.rs.GET;

import javax.ws.rs.Path;

import javax.ws.rs.Produces;

import javax.ws.rs.core.MediaType;

import api.Blog;

import api.IBlogApi;

@Path("/blog")

public class BlogApiImpl implements IBlogApi{

private static List<Blog> blogs = new ArrayList<Blog>();

static{

blogs.add(new Blog("blog1", "....", "hello", 1));

}

@Override

@GET

public String getHtml(){

return "<h1>BlogApi</h1>";

}

@Override

public List<Blog> getBlogs() {

return blogs;

}

GsonMessageBodyHandler.java

package providers;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.io.OutputStreamWriter;

import java.io.UnsupportedEncodingException;

import java.lang.annotation.Annotation;

import java.lang.reflect.Type;

import javax.ws.rs.Consumes;

import javax.ws.rs.Produces;

import javax.ws.rs.WebApplicationException;

import javax.ws.rs.core.MediaType;

import javax.ws.rs.core.MultivaluedMap;

import javax.ws.rs.ext.MessageBodyReader;

import javax.ws.rs.ext.MessageBodyWriter;

import javax.ws.rs.ext.Provider;

import com.google.gson.Gson;

import com.google.gson.GsonBuilder;

@Provider

@Produces(MediaType.APPLICATION_JSON)

@Consumes(MediaType.APPLICATION_JSON)

public final class GsonMessageBodyHandler implements MessageBodyWriter<Object>,

MessageBodyReader<Object> {

private static final String UTF_8 = "UTF-8";

private Gson gson;

private Gson getGson() {

if (gson == null) {

final GsonBuilder gsonBuilder = new GsonBuilder();

gson = gsonBuilder.create();

}

return gson;

}

@Override

public boolean isReadable(Class<?> type, Type genericType,

java.lang.annotation.Annotation[] annotations, MediaType mediaType) {

return true;

}

@Override

public Object readFrom(Class<Object> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, String> httpHeaders, InputStream entityStream) throws IOException {

InputStreamReader streamReader = new InputStreamReader(entityStream, UTF_8);

try {

Type jsonType;

if (type.equals(genericType)) {

jsonType = type;

} else {

jsonType = genericType;

}

return getGson().fromJson(streamReader, jsonType);

} finally {

streamReader.close();

}

@Override

public boolean isWriteable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {

return true;

}

@Override

public long getSize(Object object, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {

return -1;

}

@Override

public void writeTo(Object object, Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType, MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream) throws IOException, WebApplicationException {

OutputStreamWriter writer = new OutputStreamWriter(entityStream, UTF_8);

try {

Type jsonType;

if (type.equals(genericType)) {

jsonType = type;

} else {

jsonType = genericType;

}

getGson().toJson(object, jsonType, writer);

} finally {

writer.close();

}