Android：HttpURLConnection使用,Tomcat的Servlet

GET 方式：

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import java.util.Map;

public class URLGetSample {

    public static void main(String[] args) throws IOException {

        URL url = new URL("http://javaking75.blog.me/rss");

        System.out.println("URL :" + url.toExternalForm());

        HttpURLConnection conn = (HttpURLConnection) url.openConnection();

        conn.setRequestMethod("GET"); 

        // 链接timeout时间
        conn.setConnectTimeout(3000); // 3秒 
        // 读timeout时间
        conn.setReadTimeout(3000); // 3秒

        System.out.println("getRequestMethod():" + conn.getRequestMethod());

        System.out.println("getContentType():" + conn.getContentType());

        System.out.println("getResponseCode():"    + conn.getResponseCode());

        System.out.println("getResponseMessage():" + conn.getResponseMessage());

        // 打印header信息
        for (Map.Entry> header : conn.getHeaderFields().entrySet()) {
            for (String value : header.getValue()) {
                System.out.println(header.getKey() + " : " + value);
            }
        }

        try (InputStream in = conn.getInputStream();
                ByteArrayOutputStream out = new ByteArrayOutputStream()) {

            byte[] buf = new byte[1024 * 8];
            int length = 0;
            while ((length = in.read(buf)) != -1) {
                out.write(buf, 0, length);
            }
            System.out.println(new String(out.toByteArray(), "UTF-8"));            
        }

        conn.disconnect();
    }
}

运行程序，打印的内容，，

POST方法

本地的java程序：

import java.net.*;
import java.util.*;
import java.io.*;

public class HttpURLConnection_test {

    public static void main(String[] args) throws IOException {
        URL url = new URL("http://localhost:8080/web_test/SampleServlet");
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();

        conn.setRequestMethod("POST");
        conn.setDoOutput(true);

        try (OutputStream out = conn.getOutputStream()) {
            out.write("id=javaking".getBytes());
            out.write("&".getBytes());
            out.write(("name=" + URLEncoder.encode("king","UTF-8")).getBytes());
        }

        try (InputStream in = conn.getInputStream();
             ByteArrayOutputStream out = new ByteArrayOutputStream()) {
            byte[] buf = new byte[1024 * 8];
            int length = 0;
            while ((length = in.read(buf)) != -1) {
                out.write(buf, 0, length);
            }
            System.out.println(new String(out.toByteArray(), "UTF-8"));
        }
        conn.disconnect();
    }
}

服务器上Servlet程序。编译完之后，放到Tomcat目录下。

WEB-INF\classes\com\test\SampleServlet.class

然后重新启动Tomcat。

package com.test;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Enumeration;

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

    /**
     * @see HttpServlet#HttpServlet()
     */
    public SampleServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        request.setCharacterEncoding("UTF-8");

        Enumeration parameterNames = request.getParameterNames();
        while(parameterNames.hasMoreElements()) {
            String name = (String) parameterNames.nextElement();
            System.out.println(name + "=" + request.getParameter(name));
        }

        response.setContentType("text/html");
        response.setCharacterEncoding("UTF-8");
        PrintWriter out = response.getWriter();

        out.println("");
        out.println("");
        out.println("");
        out.println("");
        out.println("body");
        out.println("Post Request Success!>");
        out.println("ID:"+request.getParameter("id"));
        out.println("name:"+request.getParameter("name"));
        out.println("");
        out.println("");
    }

}

打印的内容为：

<html>
<head>
<title>SampleServlettitle>
head>
body
Post Request Success!>
ID:javaking
name:king
body>
html>

用HttpURLConnection实现文件上传下载，，

http://blog.csdn.net/springsky_/article/details/7095034

http://www.apkbus.com/android-27613-1-1.html?_dsign=807c48ff

http://www.tuicool.com/articles/AnaaMbA

http://javaking75.blog.me/220552685641

httpclient方式