JAVA，HTTP请求，JSON数据格式-优快云博客

本文链接：https://blog.youkuaiyun.com/kevin3061/article/details/25190005

本文介绍了一个使用Java编写的HTTP请求工具类，该类通过POST方式发送JSON格式的数据，并接收服务器返回的响应。文章展示了如何利用Jackson库进行JSON数据的序列化与反序列化。

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package com.test.http;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.ObjectMapper;
public class HttpUtils {
 public static final String POST_URL = " http://localhost:8080/ddJihe";
 
 public static String post(String action,StringjsonStr){
  StringBuffer sbff = newStringBuffer("");;
  try {
   //发送请求
   URL postUrl =new URL(POST_URL + action);
   HttpURLConnectionconnection = (HttpURLConnection) postUrl.openConnection();
   connection.setDoOutput(true);
   //connection.setDoInput(true);
   connection.setRequestMethod("POST");
   //connection.setUseCaches(false);
   //connection.setInstanceFollowRedirects(true);
   //connection.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
   PrintWriterout = new PrintWriter(connection.getOutputStream());
   out.print("postData="+URLEncoder.encode(jsonStr,"UTF-8"));
   out.flush();
   out.close();
   //接收数据
   BufferedReaderreader = new BufferedReader(newInputStreamReader(connection.getInputStream()));
   Stringline;
   while((line =reader.readLine()) != null){
    sbff.append(line);
   }
   reader.close();
  } catch (Exception e) {
   e.printStackTrace();
  }
  return sbff.toString();
 }
 
 public static void main(String[] args) {
  String action ="/jhJhxflTb/testHttp";
  Map map = new HashMap();
  map.put("name", "kevin");
  
  JsonFactory jf = newJsonFactory();
  StringWriter sw = newStringWriter();
  ObjectMapper om = newObjectMapper();
  try {
   JsonGeneratorjg = jf.createGenerator(sw);
   om.writeValue(jg,map);
  } catch (IOException e) {
   e.printStackTrace();
  }
  
  System.out.println("请求数据：\n"+sw.toString());
  String res =HttpUtils.post(action, sw.toString());
  System.out.println("响应数据:\n"+res);
  System.out.println("响应数据提取：");
  try {
   Map m =om.readValue(res, Map.class);
   System.out.println(m.get("creatorName"));
  } catch (Exception e) {
   e.printStackTrace();
  }
 }
}

需要jackson-core-2.2.3.jar、jackson-databind-2.2.3.jar、jackson-annotations-2.2.3.jar包的支持