Java-->服务器的响应(Servlet--doGet&doPost)

--> Servelet: 用于接收请求(客户端,浏览器),做出响应的,服务器端的,java类

--> ServletLogin -- Web项目服务器响应的Java实现

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 + "登陆成功!");

        // 服务器会自动关流

    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        request.setCharacterEncoding("utf-8"); // 只解决post 请求乱码问题

        doGet(request, response);

    }

    public String parse(String msg) throws UnsupportedEncodingException {

        return new String(msg.getBytes("iso8859-1"), "utf-8");

    }

}

1、doGet 方法：

--> HttpURLConnectionUtil 工具类

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);

            // 用这个方法可以设置http的请求头

            // conn.addRequestProperty("Accept", "......");

            if (conn.getResponseCode() == HttpURLConnection.HTTP_OK) {

                // 获取编码

                // String contentType = conn.getContentType();

                // String string = contentType.split("=")[1];

                InputStream inputStream = conn.getInputStream();

                return inputStream;

            }

        } catch (IOException e) {

            e.printStackTrace();

        }

        return null;

    }

}

--> Test 测试类

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();

        }

    }

}

----------------------------------邪恶的分割线------------------------------------

2、doPost 方法

--> HttpURLConnectionUtil 工具类

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的转换类

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 测试类

package com.dragon.java.urlbypost;

import java.io.InputStream;

public class Test {

    public static void main(String args[]) {

　　　　// 需要对URL中的中文参数进行编码。
　　　　String user = URLEncoder.encode("张三", "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()));

    }

}

---> 注意先将Web项目导入到服务器并运行...

巴特西

Java-->服务器的响应(Servlet--doGet&doPost)

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