HttpClient/ HttpUrlConnection/UrlConnection

常用编码转换

deGet方法测试

DoPost

HttpClientDoGet

HttpClientDoPOST

HttpUrlConnection:sun公司封装的网络连接



doGet

doPost



HttpClient：Apache使用HttpURLConnection封装的类



HttpClientdoGet

HttpClientdoPost

常用编码转换

// 设置接受的数据类型
httpConnection.setRequestProperty("Accept-Charset", "utf-8");
// 设置可以接受序列化的java对象 
            httpConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

deGet方法测试

JButton btnNewButton = new JButton("doGet方法测试");
        btnNewButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                String urlString="http://localhost:8080/MyServiceTest/MyTestServerlet?username=zhangsan&password=123456";
                try {
                    URL url=new URL(urlString);//生成URL
                    URLConnection connect=url.openConnection();//打开url链接
                    //强制转型成httpurlconnection
                    HttpURLConnection httpConnection=(HttpURLConnection)connect;
                    //设置请求方法
                    httpConnection.setRequestMethod("GET");
                    //设置编码格式
                    // 设置接受的数据类型
                    httpConnection.setRequestProperty("Accept-Charset", "utf-8");
                    // 设置可以接受序列化的java对象
                    httpConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
                    int code=httpConnection.getResponseCode();
                    System.out.println("状态码："+code);
                    if(code==HttpURLConnection.HTTP_OK){
                        InputStream is=httpConnection.getInputStream();
                        BufferedReader br=new BufferedReader(new InputStreamReader(is));
                        String line=br.readLine();

                        while (line!=null){
                            System.out.println(line);
                            line=br.readLine();
                        }

                    }

#

1生成URL ——->URL url=new URL(urlString);

2开url链接——–>URLConnection connect=url.openConnection();

3强制转型httpurlconnection——->HttpURLConnection httpConnection=(HttpURLConnection)connect;

DoPost

//设置请求方法

httpConnection.setRequestMethod(“POST”);

//设置可以读取服务器返回的内容默认true

httpConnection.setDoInput(true);

//设置哭护短可以给服务器提交数据，默认为false但POST必须设置true

httpConnection.setDoOutput(true);

//POST方法不允许使用缓存

httpConnection.setUseCaches(false);

String params=”username=zhangsan&password=lisi”;

httpConnection.getOutputStream().write(params.getBytes());

public void actionPerformed(ActionEvent arg0) {
                String urlString="http://localhost:8080/MyServiceTest/MyTestServerlet?username=zhangsan&password=123456";
                try {
                    URL url=new URL(urlString);//生成URL
                    URLConnection connect=url.openConnection();//打开url链接
                    //强制转型成httpurlconnection
                    HttpURLConnection httpConnection=(HttpURLConnection)connect;

                    //设置读取时间超时
                    httpConnection.setReadTimeout(30000);
                    //设置链接超时时间
                    httpConnection.setConnectTimeout(30000);

                    //设置编码格式
                    // 设置接受的数据类型
                    httpConnection.setRequestProperty("Accept-Charset", "utf-8");
                    // 设置可以接受序列化的java对象
                    httpConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
                    //设置请求方法
                    httpConnection.setRequestMethod("POST");
                    //设置可以读取服务器返回的内容默认true
                    httpConnection.setDoInput(true);
                    //设置哭护短可以给服务器提交数据，默认为false但POST必须设置true
                    httpConnection.setDoOutput(true);
                    //POST方法不允许使用缓存
                    httpConnection.setUseCaches(false);
                    String params="username=zhangsan&password=lisi";
                    httpConnection.getOutputStream().write(params.getBytes());

                    int code=httpConnection.getResponseCode();
                    System.out.println("状态码："+code);
                    if(code==HttpURLConnection.HTTP_OK){
                        InputStream is=httpConnection.getInputStream();
                        BufferedReader br=new BufferedReader(new InputStreamReader(is));
                        String line=br.readLine();

                        while (line!=null){
                            System.out.println(line);
                            line=br.readLine();
                        }

                    }2

                } catch (MalformedURLException e) {

                    e.printStackTrace();
                } catch (ConnectException e) {
                    System.out.println("服务器拒绝链接");
                    e.printStackTrace();
                }catch ( SocketTimeoutException e) {
                    System.out.println("网络连接超时");
                    e.printStackTrace();
                }catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }

HttpClientDoGet

JButton btnNewButton = new JButton("HttpClientDoGet");
        btnNewButton.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                String urlString="http://localhost:8080/MyServiceTest/MyTestServerlet?username=zhangsan&password=123456";
                HttpClientBuilder builder=HttpClientBuilder.create();
                builder.setConnectionTimeToLive(3000, TimeUnit.MILLISECONDS);
                //生成client的buidler
                HttpClient client=builder.build();//生成client
                HttpGet get=new HttpGet(urlString);//设置为get方法
                get.setHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
                //设置服务器接收后数据的读取方式为utf8
                try {
                    HttpResponse response=client.execute(get);//执行get方法得到服务器的返回的所有数据都在response中
                    StatusLine statusLine=response.getStatusLine();//httpClient访问服务器返回的表头，包含http状态码
                    int code=statusLine.getStatusCode();//得到状态码
                    if(code==HttpURLConnection.HTTP_OK){
                        HttpEntity entity=response.getEntity();//得到数据的实体
                        InputStream is=entity.getContent();//得到输入流
                        BufferedReader br=new BufferedReader(new InputStreamReader(is));
                        String line=br.readLine();
                        while(line!=null){
                            System.out.println(line);
                            line=br.readLine();
                        }
                    }
                } catch (ClientProtocolException e1) {
                    // TODO Auto-generated catch block
                    e1.printStackTrace();
                } catch (IOException e1) {
                    // TODO Auto-generated catch block
                    e1.printStackTrace();
                }
            }
        });

HttpClientDoPOST

public void actionPerformed(ActionEvent arg0) {
                String urlString = "http://localhost:8080/MyServiceTest/MyTestServerlet";
                HttpClientBuilder builder = HttpClientBuilder.create();
                builder.setConnectionTimeToLive(3000, TimeUnit.MICROSECONDS);
                // 生成client的builder
                HttpClient client = builder.build();
                HttpPost post = new HttpPost(urlString);// 设置为get方法
                NameValuePair pair1=new BasicNameValuePair("username","张三");
                NameValuePair pair2=new BasicNameValuePair("password","123456");
                ArrayList<NameValuePair>params=new ArrayList<>();
                params.add(pair1);
                params.add(pair2);
                try {
                    post.setEntity(new UrlEncodedFormEntity(params ,"UTF-8"));
                    post.setHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
                    HttpResponse response =client.execute(post);
                int code =response.getStatusLine().getStatusCode();
                if(code==200){
                    HttpEntity entity=response.getEntity();
                    InputStream is=entity.getContent();
                    BufferedReader br= new BufferedReader(new InputStreamReader(is));
                    String line =br.readLine();
                    while(line!=null){
                        System.out.println(line);
                        line=br.readLine();
                    }

                }