基于rest风格对Neo4j进行调用访问之———httpClient

1.什么是rest风格

不知道戳这里

2.什么是Neo4j

简单来说是一个图形数据库，是一种NOSQL型的。具体摸我

3.httpclient 访问

参考官网链接摸我。 代码如下：

代码语言：javascript复制

package neo4j.action;



import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;

import neo4j.config.RestTemplateConfiguration;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.httpclient.HttpClient;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.params.HttpParams;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.*;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;
import java.util.*;


@RestController
@RequestMapping("/neo4j/data")
public class NeoController {
    private static final Logger log = LoggerFactory.getLogger(NeoController.class);

    @RequestMapping(value = "/getData", method = RequestMethod.POST)
    public String getHello() {
        //建立连接
        log.info("getData接口调用开始时间:" new Date());// 接口调用开始时间
        String url = "http://localhost:7474/db/data/transaction/commit";
        CredentialsProvider credsProvider = new BasicCredentialsProvider();
        credsProvider.setCredentials( new AuthScope("ip or host", port),
                new UsernamePasswordCredentials("username", "password"));
        CloseableHttpClient httpClient = HttpClients.custom().setDefaultCredentialsProvider(credsProvider).build();

        //参数准备以及封装请求
        StringEntity s = new StringEntity("{n"  
                "  "statements" : [ {n"  
                "    "statement" : "MATCH (n) RETURN n LIMIT 25"n"  
                "  } ]n"  
                "}","UTF-8");
        s.setContentEncoding("UTF-8");
        s.setContentType("application/json");//发送json数据需要设置contentType


        HttpPost httppost = new HttpPost(url);
        httppost.setEntity(s);
        httppost.addHeader("Content-Type", "application/json");
        httppost.addHeader("charset", "UTF-8");
        CloseableHttpResponse response = null;

        //获取结果
        String respString = "";
        try {
            response = httpClient.execute(httppost);
             respString = EntityUtils.toString(response.getEntity());
            log.info(respString);
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                if (response != null) {
                    response.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }



        return respString;
    }
}

4，通过postman模拟点击结果返回

nosql httpclient neo4j postman rest

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