一、首先是Http方式
服务器端:

@WebServlet("/service")
public class ServiceServlet extends HttpServlet {
    private static final long serialVersionUID=1L;

    public void doGet(HttpServletRequest request,HttpServletResponse response) 
            throws IOException {
        this.doPost(request, response);
    }
    public void doPost(HttpServletRequest request,HttpServletResponse response) 
            throws IOException {
        System.out.println("doPost方法进来");
        response.setContentType("text/html");//解决中文乱码
        response.setCharacterEncoding("UTF-8");

        DataInputStream inputStream = null;  //数据输入流
        String strInputstream =""; 

        inputStream =new DataInputStream(request.getInputStream());                   
        ByteArrayOutputStream baos = new ByteArrayOutputStream();  // 可以捕获内存缓冲区的数据,转换成字节数组
        byte[] by = new byte[2048];  
        int n;  
        while((n=inputStream.read(by))!=-1){  //将流中的数据缓冲到字节数组中去,如果没到末尾返回的是真实个数,到末尾时,返回的是-1;
            baos.write(by,0,n);    //readline将会把json格式破坏掉       
        }  
        strInputstream = new String(baos.toByteArray()); 
        inputStream.close();
        baos.close();  

        JSONObject jsonObject=JSONObject.fromObject(strInputstream);
        System.out.printf("客户端请求的数据:"+jsonObject.toString());
        System.out.println("");
        @SuppressWarnings("unchecked")
        Map<String,Object> map=jsonObject;
        Object value=0;
        for(Entry<String, Object> entry:map.entrySet() ) {
            value=entry.getValue();
            System.out.println(entry.getKey()+"="+entry.getValue());
        }
        System.out.println("");
        //连接数据库
        Connection connection=DBUtils.getConnection();
        String sql="select software_type,software_version from soft_version_info";
        try {
            PreparedStatement pstm=connection.prepareStatement(sql);
            ResultSet rs=pstm.executeQuery();
            // 获取表结构
            ResultSetMetaData md = rs.getMetaData();
            // 得到行的总数
            int num = md.getColumnCount();
            JSONArray jsonArray = new JSONArray();
            while(rs.next()) {
                String version = rs.getString("software_version");
                JSONObject mapOfColValues = new JSONObject();
                for (int i = 1; i <= num; i++) {
                    // 添加键值对
                    if((Object)rs.getObject(i)==value) {
                        mapOfColValues.put("server", "version");
                        mapOfColValues.put(md.getColumnName(i), rs.getObject(i));
                        mapOfColValues.put("software_version", version);
                        PrintWriter out=response.getWriter();
                        out.write(mapOfColValues.toString());
                        System.out.println("服务器响应的数据:"+mapOfColValues.toString());
                        out.flush();
                        out.close();
                    }
                  } 
                jsonArray.add(mapOfColValues);              
            }
        } catch (SQLException e) {
            e.printStackTrace();
        }

    }
} 

客户端:

public class ClientServlet{


    private static String urlPath="http://localhost:8080/JsonUse/service";




    public static void main(String[] args) throws IOException {
        URL db=new URL(ClientServlet.urlPath);
        HttpURLConnection link=(HttpURLConnection) db.openConnection();
        link.setDoInput(true);
        link.setDoOutput(true);
        link.setRequestMethod("POST");
        link.setRequestProperty("Charset", "UTF-8");
        //请求
        DataOutputStream dos=new DataOutputStream(link.getOutputStream());
        JSONObject jsonObject=new JSONObject();
        //填充json数据内容
        jsonObject.put("server", "getversion");
        jsonObject.put("softtype", 4);
        //json转化成字符串
        String string=jsonObject.toString();
        //字符串转化byte数组
        byte[] bytes=string.getBytes();
        //发送json数据
        //pWriter.write(bytes);
        dos.write(bytes);
        dos.flush();//刷新,向服务器发送信息;
        dos.close();
        //响应
        //列出原始数据
        StringBuilder json=new StringBuilder();
        BufferedReader in=new BufferedReader(new InputStreamReader(link.getInputStream(),"UTF-8"));
        String inputLine=null;
        while((inputLine=in.readLine())!=null) {
            json.append(inputLine);
        }
        in.close();
        String Strjson=json.toString();
        System.out.println("服务器返回的数据:");
        System.out.println(Strjson.toString());
    }
}

运行后服务器控制台输出:

doPost方法进来
客户端请求的数据:{"server":"getversion","softtype":4}
server=getversion
softtype=4

服务器响应的数据:{"server":"version","software_type":4,"software_version":"v1.0"}

客户端控制台输出:

服务器返回的数据:
{"server":"version","software_type":4,"software_version":"v1.0"}

二、用socket方式
服务器端:

public class Service {
    public static void main(String[] args) {
        try {
             @SuppressWarnings("resource")
            ServerSocket serverSocket=new ServerSocket(8888);//绑定端口号
             System.out.println("***服务器已经打开***");//提示信息
             Socket socket=null;//
             //Integer count=0;
             socket=serverSocket.accept();//这个socket用来读取接受的数据

             DataInputStream inputStream = null;  //数据输入流
            // DataOutputStream outputStream = null;  //数据输出流
             String strInputstream =""; 

             inputStream =new DataInputStream(socket.getInputStream());                   
             ByteArrayOutputStream baos = new ByteArrayOutputStream();  // 可以捕获内存缓冲区的数据,转换成字节数组
             byte[] by = new byte[2048];  
             int n;  
             while((n=inputStream.read(by))!=-1){  //将流中的数据缓冲到字节数组中去,如果没到末尾返回的是真实个数,到末尾时,返回的是-1;
                 baos.write(by,0,n);    //readline将会把json格式破坏掉       
             }  
             strInputstream = new String(baos.toByteArray()); 
             socket.shutdownInput();  
             baos.close();  

             JSONObject jsonObject=JSONObject.fromObject(strInputstream);
             //String software_version=jsonObject.optString("server");
             //String software_type=jsonObject.optString("softtype");
             System.out.printf("客户端请求的数据:"+jsonObject.toString());
             System.out.println("");
             @SuppressWarnings("unchecked")
            Map<String,Object> map=jsonObject;
             Object value=0;
             for(Entry<String, Object> entry:map.entrySet() ) {
                 value=entry.getValue();
                 System.out.println(entry.getKey()+"="+entry.getValue());
             }
//             System.out.println(value);
             System.out.println("");

            //连接数据库
            Connection connection=DBUtils.getConnection();
            String sql="select software_type,software_version from soft_version_info";

            PreparedStatement ptmt=connection.prepareStatement(sql);
            ResultSet rs = ptmt.executeQuery();
            // 获取表结构
            ResultSetMetaData md = rs.getMetaData();
            // 得到行的总数
            int num = md.getColumnCount();
            JSONArray jsonArray = new JSONArray();
            while( rs.next() ){                  //下移一条
                //int softtype = rs.getInt("software_type");  //rs.getString( 列索引 );
                String version = rs.getString("software_version"); 
                 JSONObject mapOfColValues = new JSONObject();
                  for (int i = 1; i <= num; i++) {
                    // 添加键值对
                    if((Object)rs.getObject(i)==value) {
                        mapOfColValues.put("server", "version");
                        mapOfColValues.put(md.getColumnName(i), rs.getObject(i));
                        mapOfColValues.put("software_version", version);
                        System.out.println("服务器响应的数据:"+mapOfColValues.toString());
                      }                 
                  }              
                  jsonArray.add(mapOfColValues);
//              System.out.printf( "%d, %s\r", softtype, version);
            } 
            //服务器响应客户端
            int port =socket.getPort();
            System.out.printf("客户端端口号:"+port);

//            Socket socket1=new Socket("localhost",port);
//            OutputStream os = socket1.getOutputStream();
//            PrintWriter pw =new PrintWriter(os);
//      
//            pw.flush();
//            socket1.shutdownOutput();
//            pw.close();
//            os.close();
//            socket1.close();
        } catch (SQLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

客户端:

public class Client {

    public static void main(String[] args) throws UnknownHostException, IOException {
        Socket socket=new Socket("localhost",8888);//客户端socket,用来发送数据。
        OutputStream outputStream=socket.getOutputStream();
        //PrintWriter pWriter=new PrintWriter(outputStream);
        //创建json格式数据
        JSONObject jsonObject=new JSONObject();
        //填充json数据内容
        jsonObject.put("server", "getversion");
        jsonObject.put("softtype", 4);
        //json转化成字符串
        String string=jsonObject.toString();
        //字符串转化byte数组
        byte[] bytes=string.getBytes();
        //发送json数据
        //pWriter.write(bytes);
        outputStream.write(bytes);
        outputStream.flush();//刷新,向服务器发送信息;
        //pWriter.
        //pWriter.flush();
        socket.shutdownOutput();

        //pWriter.close();
        outputStream.close();
        socket.close();


        int port =socket.getLocalPort();
        System.out.println("客户端发送的请求数据端口:"+port);
        System.out.println();

//      @SuppressWarnings("resource")
//      ServerSocket serverSocket=new ServerSocket(port);
//
//      Socket socket1=serverSocket.accept();
//      
//      
//      InputStream is=socket1.getInputStream();
//      InputStreamReader inr =new InputStreamReader(is);
//      BufferedReader bReader=new BufferedReader(inr);
//      System.out.println(bReader);
//      String data = bReader.readLine();
//      System.out.println(data);
//      while(data!=null)
//      {
//          System.out.println("数据是:"+data);
//          data=bReader.readLine();
//      }
//
//      socket1.shutdownInput();
//      bReader.close();
//      inr.close();
//      is.close();
//      socket1.close();
    }

 }

运行后,客户端控制台输出:

客户端发送的请求数据端口:55328

服务器控制台输出:

***服务器已经打开***
客户端请求的数据:{"server":"getversion","softtype":4}
server=getversion
softtype=4

服务器响应的数据:{"server":"version","software_type":4,"software_version":"v1.0"}
客户端端口号:55328

json数据块的转化:

//创建json格式数据
        JSONObject jsonObject=new JSONObject();
        //填充json数据内容
        jsonObject.put("server", "getversion");
        jsonObject.put("softtype", 4);
        //json转化成字符串
        String string=jsonObject.toString();
        //字符串转化byte数组
        byte[] bytes=string.getBytes();

用JSONObject,需要导入几个jar包,如下:

json-lib-2.4-jdk15.jar
commons-lang-2.5.jar
commons-beanutils-1.7.0.jar
ezmorph-1.0.3.jar
commons-collections-3.1.jar
commons-logging-1.1.1.jar

需要导入到WebContent/WEB-INF/lib目录下

GitHub 加速计划 / js / json
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适用于现代 C++ 的 JSON。
最近提交(Master分支:2 个月前 )
960b763e 4 个月前
8c391e04 7 个月前
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