访问rest接口

最新推荐文章于 2023-12-06 17:23:34 发布

原创最新推荐文章于 2023-12-06 17:23:34 发布 · 1.4k 阅读

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CC 4.0 BY-SA版权

文章标签：

#rest

本文介绍了一个使用Java实现的HTTP客户端类，该类通过POST方法发送JSON格式的数据，并接收响应。文章详细展示了如何导入必要的jar包，如commons-beanutils、commons-collections等，并提供了完整的类定义代码。

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导入jar包：

commons-beanutils-1.7.0.jar
commons-collections-3.1.jar
commons-lang-2.5.jar
commons-logging.jar
ezmorph-1.0.3.jar
json-lib-2.4-jdk15.jar
httpclient-4.3.2.jar
httpcore-4.3.2.jar

代码：


import java.io.IOException;
import java.nio.charset.Charset;

import net.sf.json.JSONObject;

import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

public class AccessRest {
    private static AccessRest accessRest = null;
    private String apiURL = "";
    private HttpClient httpClient = null;
    private HttpPost method = null;

    /**
     * 默认构造方法
     */
    private AccessRest() {
    }

    /**
     * 含参构造方法
     * 
     * @param url
     */
    private AccessRest(String url) {
        if (null != url && !"".equals(url)) {
            this.apiURL = url;
        }
        if (null != apiURL && !"".equals(apiURL)) {
            httpClient = new DefaultHttpClient();
            method = new HttpPost(apiURL);
        }
    }

    /**
     * 单例方法
     * @param url
     * @return
     */
    public static AccessRest getInstance(String url) {
        if (accessRest == null) {
            accessRest = new AccessRest(url);
        }
        return accessRest;
    }

    /**
     * 设置URL
     * @param url
     */
    public void setAPIURL(String url){
        this.apiURL=url;
        if (null != apiURL && !"".equals(apiURL)) {
            httpClient = new DefaultHttpClient();
            method = new HttpPost(apiURL);
        }
    }

    /**
     * JSON内容格式的POST请求
     * @param params
     * @return
     * @throws ClientProtocolException
     * @throws IOException
     */
    public String JSONToPost(String token,String params) throws ClientProtocolException, IOException {
        //添加post请求报文header，格式为JSON
        method.setHeader("Content-type","application/json; charset=utf-8");
        method.setHeader("Accept", "application/json");
        //添加JSON格式报文内容
        method.setEntity(new StringEntity(params, Charset.forName("UTF-8")));
        //访问接口
        HttpResponse response = httpClient.execute(method);
        //构造返回值
        JSONObject message = new JSONObject();
        //添加状态码
        message.put("StatusCode", String.valueOf(response.getStatusLine().getStatusCode()));
        //添加内容
        message.put("Message", EntityUtils.toString(response.getEntity()));
        return message.toString();
    }

    /**
     * 普通参数访问网址
     * @param params
     * @return
     * @throws ClientProtocolException
     * @throws IOException
     */
    public String urlencodedToPost(String params) throws ClientProtocolException, IOException{
        //设置请求报文头
        method.setHeader("Content-type","application/json; charset=utf-8");
        method.setHeader("Accept", "application/x-www-form-urlencoded");
        //设置请求参数
        method.setEntity(new StringEntity(params, Charset.forName("UTF-8")));
        //访问接口
        HttpResponse response = httpClient.execute(method);
        //构造返回值
        JSONObject message = new JSONObject();
        //添加状态码
        message.put("StatusCode", String.valueOf(response.getStatusLine().getStatusCode()));
        //添加内容
        message.put("Message", EntityUtils.toString(response.getEntity()));
        return message.toString();
    }
}