JSONObject和URL以及HttpURLConnection的使用

1 将java对象类转成json格式

首先引入依赖jar文件

注意依赖文件的版本号，高版本可能没有对应的类

2 我的实体类中包含内部类注意内部类要public才能被序列化成json格式

import java.util.List;

public class EuityParam {

    public EuityParam(String filter,List<String> args)

    {

        super();

        this.filter=new Param0(filter);

        this.args=new Param1(args);

    }

    private Param1 args;

    public Param1 getArgs()

    {

        return args;

    }

    public void setArgs(Param1 _Param1)

    {

        this.args=_Param1;

    }

    private Param0 filter;

    public Param0 getFilter()

    {

        return filter;

    }

    public void setFilter(Param0 _param0)

    {

        this.filter=_param0;

    }

    public class Param1

    {

        public List<String> getNameList() {

            return nameList;

        }

        public void setNameList(List<String> nameList) {

            this.nameList = nameList;

        }

        public Param1(List<String> nameList)

        {

            this.nameList=nameList;

        }

        private List<String> nameList;

    }

    public class Param0

    {

        public Param0(String key)

        {

            this.key=key;

        }

        private String key;

        public String getKey()

        {

            return key;

        }

        public void setKey(String key)

        {

            this.key=key;

        }

    }

}

3 导入包文件

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

4 序列化

        List<String> nameLst=new LinkedList<String>();

        nameLst.add("AIR PRODUCTS & CHEMICALS INC");

        nameLst.add("AMAZON.COM INC");

        nameLst.add("ALTRIA GROUP INC");

        nameLst.add("APPLE INC");

        nameLst.add("ALPHABET INC");

        EuityParam euityParam=new EuityParam("EquityNameMatching", nameLst);

        JSONObject jsonData= JSONObject.fromObject(euityParam);

        System.out.println(jsonData);

5 结果：

{

    "args": {

        "nameList": [

            "AIR PRODUCTS & CHEMICALS INC",

            "AMAZON.COM INC",

            "ALTRIA GROUP INC",

            "APPLE INC",

            "ALPHABET INC"

        ]

    },

    "filter": {

        "key": "EquityNameMatching"

    }

}

6 接口的调用，这个调用是post

private static String doPost(URL url, Map<Object, Object> nameValuePairs, String userAgent, int redirescts)

            throws IOException {

        // TODO Auto-generated method stub

        StringBuilder response = new StringBuilder();

        // HttpURLConnection可以处理重定向

        HttpURLConnection connect = (HttpURLConnection) url.openConnection();

        if (userAgent != null) {

            connect.setRequestProperty("Authorization", userAgent);//设置http请求头

        }

        if (redirescts >= 0) {

            // 连接到服务器之前关闭自动重定向

            connect.setFollowRedirects(false);

        }

        // 设置请求的输出流

        connect.setDoOutput(true);

        // 构建往请求body内写入请求数据的写入流

        OutputStream out = connect.getOutputStream();

        try (PrintWriter write = new PrintWriter(out)) {

            boolean first = true;

            for (Entry<Object, Object> pair : nameValuePairs.entrySet()) {

                if (first) {

                    first = false;

                } else {

                    write.print('&');

                }

                String name = pair.getKey().toString();

                String value = pair.getValue().toString();

                write.print(name);

                write.print('=');

                write.print(URLEncoder.encode(value, "UTF-8"));

            }

        }

        // 获取请求的编码类型

        String encoding = connect.getContentEncoding();

        if (encoding == null) {

            encoding = "UTF-8";

        }

        // 如果redirect大于0表明有重定向

        if (redirescts > 0) {

            // 获取请求的响应码

            int responseCode = connect.getResponseCode();

            if (responseCode == HttpURLConnection.HTTP_MOVED_PERM || responseCode == HttpURLConnection.HTTP_MOVED_TEMP

                    || responseCode == HttpURLConnection.HTTP_SEE_OTHER) {

                // 获取重定向的位置

                String location = connect.getHeaderField("Location");

                if (location != null) {

                    java.net.URL base = connect.getURL();

                    // 断开本次连接

                    connect.disconnect();

                    return doPost(new URL(base, location), nameValuePairs, userAgent, redirescts - 1);

                }

            }

        } else if (redirescts == 0) {

            throw new IOException("重定向太多无法处理");

        }

        // 获取响应流

        InputStream responseStream = connect.getInputStream();

        try (Scanner in = new Scanner(responseStream, encoding)) {

            while (in.hasNextLine()) {

                response.append(in.nextLine());

                response.append("\n");

            }

        }

        catch (Exception e)

        {

            // TODO: handle exception

            InputStream err = connect.getErrorStream();

            if (err == null) {

                throw e;

            }

            try (Scanner in = new Scanner(err)) {

                response.append(in.hasNextLine());

            }

        }

        return response.toString();

    }

巴特西

JSONObject和URL以及HttpURLConnection的使用

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