android中Post方式发送HTTP请求

通过Post方式发送HTTP请求的代码逻辑,代码在Eclipse中实现

 

一.主要步骤

1.准备数据装入mydata(一个字节数组)

2.建立连接,设置请求体

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

connection.setConnectTimeout(3000);
connection.set...;      //设置请求体
connection.connect;

3.通过连接输出数据

OutputStream outputStream = connection.getOutputStream(); 

outputStream.write(mydata,0,mydata.length);

4.通过连接获取服务器返回结果

connection.getInputStream()

 

二.demo 

import java.io.IOException; 
import java.io.InputStream; 
import java.io.OutputStream; 
import java.io.UnsupportedEncodingException; 
import java.net.HttpURLConnection; 
import java.net.MalformedURLException; 
import java.net.URL; 
import java.net.URLEncoder; 
import java.util.HashMap; 
import java.util.Map; 
   
public class HttpUtils { 
   
    private static String PATH = "http://172.24.87.47:8088/myhttp/servlet/LoginAction"; 
    private static URL url; 
    public HttpUtils() {} 
   
    static{ 
        try { 
            url = new URL(PATH); 
        } catch (MalformedURLException e) { 
            e.printStackTrace(); 
        } 
    } 
  
public static void main(String[] arsg){ 
        Map<String, String> params = new HashMap<String, String>(); 
        params.put("username", "lili"); 
        params.put("password", "123"); 
        String result = sendPostMessage(params,"utf-8"); 
        System.out.println("result->"+result); 
    }

/**
     * @param params 填写的url的参数
     * @param encode 字节编码
     * @return
     */ 
    public static String sendPostMessage(Map<String, String> params,String encode){ 
        StringBuffer buffer = new StringBuffer(); 
        try {//把请求的主体写入正文!! 
             if(params != null&&!params.isEmpty()){ 
                //迭代器 
          //Map.Entry 是Map中的一个接口,他的用途是表示一个映射项(里面有Key和Value)
           for(Map.Entry<String, String> entry : params.entrySet()){ buffer.append(entry.getKey()).append("="). append(URLEncoder.encode(entry.getValue(),encode)). append("&"); } } // System.out.println(buffer.toString()); //删除最后一个字符&,多了一个;主体设置完毕 buffer.deleteCharAt(buffer.length()-1); byte[] mydata = buffer.toString().getBytes(); HttpURLConnection connection = (HttpURLConnection) url.openConnection(); connection.setConnectTimeout(3000); connection.setDoInput(true);//表示从服务器获取数据 connection.setDoOutput(true);//表示向服务器写数据 connection.setRequestMethod("POST"); //是否使用缓存 connection.setUseCaches(false); //表示设置请求体的类型是文本类型 connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); connection.setRequestProperty("Content-Length", String.valueOf(mydata.length)); connection.connect(); //连接,不写也可以。。??有待了解 //获得输出流,向服务器输出数据 OutputStream outputStream = connection.getOutputStream(); outputStream.write(mydata,0,mydata.length); //获得服务器响应的结果和状态码 int responseCode = connection.getResponseCode(); if(responseCode == HttpURLConnection.HTTP_OK){ return changeInputeStream(connection.getInputStream(),encode); } } catch (UnsupportedEncodingException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } return ""; } /** * 将一个输入流转换成字符串 * @param inputStream * @param encode * @return */ private static String changeInputeStream(InputStream inputStream,String encode) { //通常叫做内存流,写在内存中的 ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); byte[] data = new byte[1024]; int len = 0; String result = ""; if(inputStream != null){ try { while((len = inputStream.read(data))!=-1){ data.toString(); outputStream.write(data, 0, len); } //result是在服务器端设置的doPost函数中的 result = new String(outputStream.toByteArray(),encode); outputStream.flush(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return result; } }
 

 参考文章:https://www.cnblogs.com/jycboy/p/post01.html   作者:超超boy

 

android中Post方式发送HTTP请求

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