Servlet

servlet的方法

总结：doGet doPost HttpClientdoGet方法中输入的默认的字体格式是ISO-8859-1必须把它转换为TUF-8的格式,但是HttpClientdoPost不需要转换格式

doGet

客户端

try {                    //直接跟在URL后面是doGet方法                    URL url=new URL("http://localhost:8080/WebDay12/Myservlet?username=zhangsan&userPassword=123456");                    //打开URL连接                    URLConnection connect=url.openConnection();                    //强制转换为HTTPURLConnectio                    HttpURLConnection httpconnection=(HttpURLConnection) connect;                    //设置请求方式                    httpconnection.setRequestMethod("GET");                    //设置连接超时                    httpconnection.setConnectTimeout(3000);                    //设置读取超时                    httpconnection.setReadTimeout(3000);                    //设置编码格式                    //设置接受数据类型                    httpconnection.setRequestProperty("Accept-Charset", "utf-8");                    //设置可以接受的序列化Java对象                    httpconnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");                    int code=httpconnection.getResponseCode();                    System.out.println("HTTP 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();                        }                    }                } catch (MalformedURLException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }catch(SocketTimeoutException e){                    System.out.println("连接超时");                }catch(ConnectException e){                    System.out.println("拒绝连接");                }catch (IOException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }

servlet服务器

String userName=request.getParameter("username");        String userPassword=request.getParameter("userPassword");        System.out.println("转换前："+userName);        userName=Encoding.doEncoding(userName);        try {            Thread.sleep(1000);        } catch (InterruptedException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        Oprepate.newInstance().singIn(userName, userPassword);        response.setHeader("Content-type", "text/html;charset=UTF-8");              response.getWriter().append("用户名："+userName);        response.getWriter().append("密码"+userPassword);

字体转换

public class Encoding {    public static String doEncoding(String string){        try {            byte[] array = string.getBytes("ISO-8859-1");            string=new String(array,"UTF-8");        } catch (UnsupportedEncodingException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        return string;    }}

doPost方法

客户端

String urlString="http://localhost:8080/WebDay12/Myservlet";                try {                    URL url=new URL(urlString);                    URLConnection connection=url.openConnection();                    HttpURLConnection httpconnection=(HttpURLConnection) connection;                    //设置连接超时                    httpconnection.setConnectTimeout(30000);                    //设置读取超时                    httpconnection.setReadTimeout(30000);                    //设置编码格式                    //设置接受数据类型                    httpconnection.setRequestProperty("Accept-Charset", "utf-8");                    //设置可以接受的序列化Java对象                    httpconnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");                    httpconnection.setRequestMethod("POST");                    //设置可以读取服务器返回的内容，默认为true                    httpconnection.setDoInput(true);                    //设置客户端可以给服务器提交数据，默认是false的。post方法必须设置为true                    httpconnection.setDoOutput(true);                    //post方法不允许使用缓存                    httpconnection.setUseCaches(true);                    String params="username=zhangsan&userPassword=123456";                    httpconnection.getOutputStream().write(params.getBytes());                    int code=httpconnection.getResponseCode();                    System.out.println(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();                        }                    }                } catch (MalformedURLException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                } catch (Throwable e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }

servlet服务器

String userName=request.getParameter("username");        String userPassword=request.getParameter("userPassword");        System.out.println("转换前："+userName);        userName=Encoding.doEncoding(userName);        try {            Thread.sleep(1000);        } catch (InterruptedException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        Oprepate.newInstance().singIn(userName, userPassword);        response.setHeader("Content-type", "text/html;charset=UTF-8");              response.getWriter().append("用户名："+userName);        response.getWriter().append("密码"+userPassword);    }

字体格式转换

public class Encoding {    public static String doEncoding(String string){        try {            byte[] array = string.getBytes("ISO-8859-1");            string=new String(array,"UTF-8");        } catch (UnsupportedEncodingException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        return string;    }}

HttpClient doGet

客户端

String urlString="http://localhost:8080/WebDay12/Myservlet?username=zhangsan&userPassword=123456";                HttpClientBuilder builder=HttpClientBuilder.create();                builder.setConnectionTimeToLive(3000, TimeUnit.MILLISECONDS);                //生成client                HttpClient client=builder.build();                //设置Get方法                HttpGet get=new HttpGet(urlString);                //设置服务器接收后的数据的读取方式为utf-8                get.setHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");                try {                    //执行get方法得到服务器的返回的所有数据都在response中                    HttpResponse response=client.execute(get);                    //HttpClient访问服务器的返回表头，包含http状态码                    StatusLine statusline=response.getStatusLine();                    //得到状态码                    int code=statusline.getStatusCode();                    System.out.println(code);                    if(code==HttpURLConnection.HTTP_OK){                        //得到数据的实体                        HttpEntity entity=response.getEntity();                        //得到输入流                        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();                        }                    }                } catch (ClientProtocolException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                } catch (IOException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }

servlet服务器

String userName=request.getParameter("username");        String userPassword=request.getParameter("userPassword");        System.out.println("转换前："+userName);        userName=Encoding.doEncoding(userName);        try {            Thread.sleep(1000);        } catch (InterruptedException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        Oprepate.newInstance().singIn(userName, userPassword);        response.setHeader("Content-type", "text/html;charset=UTF-8");              response.getWriter().append("用户名："+userName);        response.getWriter().append("密码"+userPassword);    }

字体转换

public class Encoding {    public static String doEncoding(String string){        try {            byte[] array = string.getBytes("ISO-8859-1");            string=new String(array,"UTF-8");        } catch (UnsupportedEncodingException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }        return string;    }}

HttpclientdoPost

客户端

String urlString="http://localhost:8080/WebDay12/Myservlet";                HttpClientBuilder builder=HttpClientBuilder.create();                builder.setConnectionTimeToLive(30000, TimeUnit.MILLISECONDS);                HttpClient client=builder.build();                HttpPost post=new HttpPost(urlString);                NameValuePair pair1=new BasicNameValuePair("username", "zhangsan");                NameValuePair pair2=new BasicNameValuePair("userPassword", "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==HttpURLConnection.HTTP_OK){                        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();                        }                    }                } catch (UnsupportedEncodingException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                } catch (ClientProtocolException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                } catch (IOException e) {                    // TODO Auto-generated catch block                    e.printStackTrace();                }