java后台发post请求解决415的json入参报错问题

野性酷女 2021-10-09 10:42 943阅读 0赞

import java.io.BufferedReader;
    import java.io.InputStreamReader;
    import org.apache.http.Header;
    import org.apache.http.HttpResponse;
    import org.apache.http.HttpStatus;
    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 com.alibaba.fastjson.JSONObject;
    
    public class HttpUtils {
    
    	/**
         * 向指定 URL 发送POST方法的请求
         * 
         * @param url 发送请求的 URL
         * @param param 请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
         * @return 所代表远程资源的响应结果
         */
        public static String sendJsonToPost(String url, String requestParam) throws Exception {
    		 String result = "";
    		JSONObject resultJsonObject=null;
    		HttpPost post = null;
    		try {
    		HttpClient httpClient = new DefaultHttpClient();
    //		String url="http://mineservice.minedata.cn/service/lbs/service/search/multi-trajectory?appKey=3b3bad1077b441f8868d2de8d464fca9";
    		post = new HttpPost(url);
    		post.setHeader("Content-type", "application/json;charset=utf-8");
    		post.setHeader("Connection", "Close");
    		StringEntity entity = new StringEntity(requestParam, java.nio.charset.Charset.forName("UTF-8"));
    		entity.setContentEncoding("UTF-8");
    		// 发送Json格式的数据请求
    		entity.setContentType("application/json");
    		post.setEntity(entity);
    		System.out.println("post===" + post);
    		HttpResponse response = httpClient.execute(post);
    
    		// 检验返回码
    		int statusCode = response.getStatusLine().getStatusCode();
    		System.out.println(statusCode);
    		String line=null;
    		
    		StringBuilder entityStringBuilder=new StringBuilder();
    		BufferedReader in = new BufferedReader(new InputStreamReader(response.getEntity().getContent(), "UTF-8"),8*1024);
           while ((line = in.readLine()) != null) {
               result += line;
           }
    		 
    		resultJsonObject = JSONObject.parseObject(entityStringBuilder.toString());
    		if (statusCode != HttpStatus.SC_OK) {
    		//LogUtil.info("请求出错: "+statusCode);
    		System.out.println("请求出错: " + statusCode);
    		} else {
    		int retCode = 0;
    		String sessendId = "";
    		// 返回码中包含retCode及会话Id
    		for (Header header : response.getAllHeaders()) {
    		if (header.getName().equals("retcode")) {
    		retCode = Integer.parseInt(header.getValue());
    		}
    		if (header.getName().equals("SessionId")) {
    		sessendId = header.getValue();
    		}
    		}
    		}
    		} catch (Exception e) {
    		e.printStackTrace();
    		} finally {
    		if (post != null) {
    		try {
    		post.releaseConnection();
    		Thread.sleep(500);
    		} catch (InterruptedException e) {
    		e.printStackTrace();
    		}
    		}
    		
    		}
    		return result;
    		}
        
    
    }

注意：请求头需要加上"Content-type", "application/json;charset=utf-8"

post.setHeader("Content-type", "application/json;charset=utf-8");  
   post.setHeader("Connection", "Close");