Java-->伺服器的響應(Servlet--doGet&doPost)，javaservletdoget

Java-->伺服器的響應(Servlet--doGet&doPost)，javaservletdoget

--> Servelet: 用於接收請求(用戶端,瀏覽器),做出響應的,伺服器端的,java類

--> ServletLogin -- Web專案服務器響應的Java實現

package com.dragon.java.servlet;import java.io.IOException;import java.io.PrintWriter;import java.io.UnsupportedEncodingException;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * Servlet implementation class ServletLogin */@WebServlet("/ServletLogin")public class ServletLogin extends HttpServlet {    private static final long serialVersionUID = 1L;    protected void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        String user = parse(request.getParameter("user"));        String pwd = parse(request.getParameter("pwd"));        System.out.println(user + ":" + pwd);        response.setContentType("text/html;charset=utf-8");        PrintWriter writer = response.getWriter();        writer.println(user + "登陸成功!");        // 伺服器會自動關流    }    protected void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        request.setCharacterEncoding("utf-8"); // 只解決post 請求亂碼問題        doGet(request, response);    }    public String parse(String msg) throws UnsupportedEncodingException {        return new String(msg.getBytes("iso8859-1"), "utf-8");    }}

1、doGet 方法：

--> HttpURLConnectionUtil 工具類

package com.dragon.java.urlbyget;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;public class HttpURLConnectionUtil {    public static InputStream getInputStreamByGet(String url) {        try {            HttpURLConnection conn = (HttpURLConnection) new URL(url)                    .openConnection();            conn.setRequestMethod("GET");            conn.setReadTimeout(10000);            conn.setConnectTimeout(10000);            // 用這個方法可以設定http的要求標頭            // conn.addRequestProperty("Accept", "......");            if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {                // 擷取編碼                // String contentType = conn.getContentType();                // String string = contentType.split("=")[1];                InputStream inputStream = conn.getInputStream();                return inputStream;            }        } catch (IOException e) {            e.printStackTrace();        }        return null;    }}

--> Test 測試類別

package com.dragon.java.urlbyget;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;public class Test {    public static void main(String[] args) {        InputStream inputStreamByGet = HttpURLConnectionUtil                .getInputStreamByGet("http://www.baidu.com");        try {            BufferedReader br = new BufferedReader(new InputStreamReader(                    inputStreamByGet, "gb2312"));            String line = "";            while ((line = br.readLine()) != null) {                System.out.println(line);            }        } catch (IOException e) {            e.printStackTrace();        }    }}

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2、doPost 方法

--> HttpURLConnectionUtil 工具類

package com.dragon.java.urlbypost;import java.io.IOException;import java.io.InputStream;import java.io.OutputStream;import java.net.HttpURLConnection;import java.net.URL;public class HttpURLConnectionUtil {    private static String charset;    public static InputStream getInputStreamByPost(String url, String parms) {        try {            HttpURLConnection conn = (HttpURLConnection) new URL(url)                    .openConnection();            conn.setReadTimeout(5000);            conn.setConnectTimeout(5000);            conn.setRequestMethod("POST");            conn.setDoOutput(true);            OutputStream outputStream = conn.getOutputStream();            outputStream.write(parms.getBytes());            if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {                String contentType = conn.getContentType();                charset = contentType.split("=")[1];                InputStream inputStream = conn.getInputStream();                return inputStream;            }        } catch (IOException e) {            e.printStackTrace();        }        return null;    }    public static String getCharset() {        return charset;    }}

--> InputStreamUtil 流到String的轉換類

package com.dragon.java.urlbypost;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;public class InputStreamUtil {    public static String inputStreamToString(InputStream is, String charset) {        StringBuffer sb = new StringBuffer();        try (BufferedReader br = new BufferedReader(new InputStreamReader(is,                charset));) {            char[] buffer = new char[1024];            int len = -1;            while ((len = br.read(buffer)) != -1) {                sb.append(buffer, 0, len);            }            return sb.toString();        } catch (IOException e) {            e.printStackTrace();        }        return null;    }}

--> Test 測試類別

package com.dragon.java.urlbypost;import java.io.InputStream;public class Test {    public static void main(String args[]) {

　　　　// 需要對URL中的中文參數進行編碼。
　　　　String user = URLEncoder.encode("張三", "utf-8");
　　　　String pwd = URLEncoder.encode("你好", "utf-8");
　　　　InputStream inputStreamByPost = HttpURLConnectionUtil
　　　　　　　　.getInputStreamByPost(
　　　　　　　　　　　　"http://192.168.2.11:8080/08-23/ServletLogin", "user="
　　　　　　　　　　　　　　　　+ user + "&pwd=" + pwd);

        System.out.println(InputStreamUtil.inputStreamToString(                inputStreamByPost, HttpURLConnectionUtil.getCharset()));    }}

---> 注意先將Web項目匯入到伺服器並運行...